diff --git a/src/client/graphics/NameBoxCalculator.ts b/src/client/graphics/NameBoxCalculator.ts
index 5914b41d6..15f33c5a2 100644
--- a/src/client/graphics/NameBoxCalculator.ts
+++ b/src/client/graphics/NameBoxCalculator.ts
@@ -1,4 +1,4 @@
-import { Game, Player, Cell, NameViewData, MutablePlayer } from '../../core/game/Game';
+import { Game, Player, Cell, NameViewData } from '../../core/game/Game';
 import { calculateBoundingBox, within } from '../../core/Util';
 
 export interface Point {
@@ -15,7 +15,7 @@ export interface Rectangle {
 
 
 
-export function placeName(game: Game, player: MutablePlayer): NameViewData {
+export function placeName(game: Game, player: Player): NameViewData {
 
     const boundingBox = player.largestClusterBoundingBox ?? calculateBoundingBox(game, player.borderTiles());
 
diff --git a/src/core/execution/AttackExecution.ts b/src/core/execution/AttackExecution.ts
index 42ac4b8a7..8fc4f15a9 100644
--- a/src/core/execution/AttackExecution.ts
+++ b/src/core/execution/AttackExecution.ts
@@ -1,5 +1,5 @@
 import { PriorityQueue } from "@datastructures-js/priority-queue";
-import { Cell, Execution, MutableGame, MutablePlayer, Player, PlayerID, PlayerType, TerrainType, TerraNullius } from "../game/Game";
+import { Cell, Execution, MutableGame, Player, PlayerID, PlayerType, TerrainType, TerraNullius } from "../game/Game";
 import { PseudoRandom } from "../PseudoRandom";
 import { MessageType } from '../game/Game';
 import { renderNumber } from "../../client/Utils";
@@ -20,8 +20,8 @@ export class AttackExecution implements Execution {
     });
     private random = new PseudoRandom(123)
 
-    private _owner: MutablePlayer
-    private target: MutablePlayer | TerraNullius
+    private _owner: Player
+    private target: Player | TerraNullius
 
     private mg: MutableGame
 
@@ -227,7 +227,7 @@ export class AttackExecution implements Execution {
         }
     }
 
-    owner(): MutablePlayer {
+    owner(): Player {
         return this._owner
     }
 
diff --git a/src/core/execution/BattleshipExecution.ts b/src/core/execution/BattleshipExecution.ts
index 77a9a3ac8..d07309d18 100644
--- a/src/core/execution/BattleshipExecution.ts
+++ b/src/core/execution/BattleshipExecution.ts
@@ -1,4 +1,4 @@
-import { Cell, Execution, MutableGame, MutablePlayer, MutableUnit, PlayerID, TerrainType, Unit, UnitType } from "../game/Game";
+import { Cell, Execution, MutableGame, Player, MutableUnit, PlayerID, TerrainType, Unit, UnitType } from "../game/Game";
 import { PathFinder } from "../pathfinding/PathFinding";
 import { PathFindResultType } from "../pathfinding/AStar";
 import { PseudoRandom } from "../PseudoRandom";
@@ -10,7 +10,7 @@ import { TileRef } from "../game/GameMap";
 export class BattleshipExecution implements Execution {
     private random: PseudoRandom
 
-    private _owner: MutablePlayer
+    private _owner: Player
     private active = true
     private battleship: MutableUnit = null
     private mg: MutableGame = null
@@ -110,7 +110,7 @@ export class BattleshipExecution implements Execution {
         }
     }
 
-    owner(): MutablePlayer {
+    owner(): Player {
         return this._owner
     }
 
diff --git a/src/core/execution/BotExecution.ts b/src/core/execution/BotExecution.ts
index 8cadf9b22..730612a79 100644
--- a/src/core/execution/BotExecution.ts
+++ b/src/core/execution/BotExecution.ts
@@ -1,4 +1,4 @@
-import { Cell, Execution, MutableGame, MutablePlayer, Player, PlayerID, PlayerInfo, PlayerType, TerraNullius } from "../game/Game"
+import { Cell, Execution, MutableGame, Player, PlayerType, TerraNullius } from "../game/Game"
 import { PseudoRandom } from "../PseudoRandom"
 import { simpleHash } from "../Util";
 import { AttackExecution } from "./AttackExecution";
@@ -12,7 +12,7 @@ export class BotExecution implements Execution {
     private neighborsTerraNullius = true
 
 
-    constructor(private bot: MutablePlayer) {
+    constructor(private bot: Player) {
         this.random = new PseudoRandom(simpleHash(bot.id()))
         this.attackRate = this.random.nextInt(10, 50)
     }
@@ -99,7 +99,7 @@ export class BotExecution implements Execution {
         ))
     }
 
-    owner(): MutablePlayer {
+    owner(): Player {
         return this.bot
     }
 
diff --git a/src/core/execution/CityExecution.ts b/src/core/execution/CityExecution.ts
index 0eec45dd9..09ab06382 100644
--- a/src/core/execution/CityExecution.ts
+++ b/src/core/execution/CityExecution.ts
@@ -1,10 +1,10 @@
 import { consolex } from "../Consolex";
-import { Execution, MutableGame, MutablePlayer, MutableUnit, PlayerID, UnitType } from "../game/Game";
+import { Execution, MutableGame, Player, MutableUnit, PlayerID, UnitType } from "../game/Game";
 import { TileRef } from "../game/GameMap";
 
 export class CityExecution implements Execution {
 
-    private player: MutablePlayer
+    private player: Player
     private mg: MutableGame
     private city: MutableUnit
     private active: boolean = true
@@ -32,7 +32,7 @@ export class CityExecution implements Execution {
         }
     }
 
-    owner(): MutablePlayer {
+    owner(): Player {
         return null
     }
 
diff --git a/src/core/execution/DefensePostExecution.ts b/src/core/execution/DefensePostExecution.ts
index e0426a082..3ad3a8b3e 100644
--- a/src/core/execution/DefensePostExecution.ts
+++ b/src/core/execution/DefensePostExecution.ts
@@ -1,10 +1,10 @@
 import { consolex } from "../Consolex";
-import { Cell, DefenseBonus, Execution, MutableGame, MutablePlayer, MutableUnit, PlayerID, UnitType } from "../game/Game";
+import { Cell, DefenseBonus, Execution, MutableGame, Player, MutableUnit, PlayerID, UnitType } from "../game/Game";
 import { manhattanDistFN, TileRef } from "../game/GameMap";
 
 export class DefensePostExecution implements Execution {
 
-    private player: MutablePlayer
+    private player: Player
     private mg: MutableGame
     private post: MutableUnit
     private active: boolean = true
@@ -42,7 +42,7 @@ export class DefensePostExecution implements Execution {
         }
     }
 
-    owner(): MutablePlayer {
+    owner(): Player {
         return null
     }
 
diff --git a/src/core/execution/DestroyerExecution.ts b/src/core/execution/DestroyerExecution.ts
index 7dea9da54..fe1955725 100644
--- a/src/core/execution/DestroyerExecution.ts
+++ b/src/core/execution/DestroyerExecution.ts
@@ -1,4 +1,4 @@
-import { Cell, Execution, MutableGame, MutablePlayer, MutableUnit, PlayerID, TerrainType, UnitType } from "../game/Game";
+import { Cell, Execution, MutableGame, Player, MutableUnit, PlayerID, TerrainType, UnitType } from "../game/Game";
 import { PathFinder } from "../pathfinding/PathFinding";
 import { PathFindResultType } from "../pathfinding/AStar";
 import { PseudoRandom } from "../PseudoRandom";
@@ -9,7 +9,7 @@ import { TileRef } from "../game/GameMap";
 export class DestroyerExecution implements Execution {
     private random: PseudoRandom
 
-    private _owner: MutablePlayer
+    private _owner: Player
     private active = true
     private destroyer: MutableUnit = null
     private mg: MutableGame = null
@@ -118,7 +118,7 @@ export class DestroyerExecution implements Execution {
         }
     }
 
-    owner(): MutablePlayer {
+    owner(): Player {
         return this._owner
     }
 
diff --git a/src/core/execution/DonateExecution.ts b/src/core/execution/DonateExecution.ts
index 5c93b41f2..fa3cd8e1b 100644
--- a/src/core/execution/DonateExecution.ts
+++ b/src/core/execution/DonateExecution.ts
@@ -1,10 +1,10 @@
 import { consolex } from "../Consolex";
-import { Execution, MutableGame, MutablePlayer, PlayerID } from "../game/Game";
+import { Execution, MutableGame, Player, PlayerID } from "../game/Game";
 
 export class DonateExecution implements Execution {
 
-    private sender: MutablePlayer
-    private recipient: MutablePlayer
+    private sender: Player
+    private recipient: Player
 
     private active = true
 
@@ -33,7 +33,7 @@ export class DonateExecution implements Execution {
         this.active = false
     }
 
-    owner(): MutablePlayer {
+    owner(): Player {
         return null
     }
 
diff --git a/src/core/execution/EmojiExecution.ts b/src/core/execution/EmojiExecution.ts
index 04d753ab6..438e8090e 100644
--- a/src/core/execution/EmojiExecution.ts
+++ b/src/core/execution/EmojiExecution.ts
@@ -1,10 +1,10 @@
 import { consolex } from "../Consolex";
-import { AllPlayers, Execution, MutableGame, MutablePlayer, PlayerID, PlayerType, UnitType } from "../game/Game";
+import { AllPlayers, Execution, MutableGame, Player, PlayerID, PlayerType, UnitType } from "../game/Game";
 
 export class EmojiExecution implements Execution {
 
-    private requestor: MutablePlayer
-    private recipient: MutablePlayer | typeof AllPlayers
+    private requestor: Player
+    private recipient: Player | typeof AllPlayers
 
     private active = true
 
@@ -32,7 +32,7 @@ export class EmojiExecution implements Execution {
         this.active = false
     }
 
-    owner(): MutablePlayer {
+    owner(): Player {
         return null
     }
 
diff --git a/src/core/execution/ExecutionManager.ts b/src/core/execution/ExecutionManager.ts
index 43a51bbb6..8be61d442 100644
--- a/src/core/execution/ExecutionManager.ts
+++ b/src/core/execution/ExecutionManager.ts
@@ -1,4 +1,4 @@
-import { Cell, Execution, MutableGame, Game, MutablePlayer, PlayerInfo, TerraNullius, PlayerType, Alliance, UnitType } from "../game/Game";
+import { Cell, Execution, MutableGame, Game, Player, PlayerInfo, TerraNullius, PlayerType, Alliance, UnitType } from "../game/Game";
 import { AttackIntent, BoatAttackIntentSchema, GameID, Intent, Turn } from "../Schemas";
 import { AttackExecution } from "./AttackExecution";
 import { SpawnExecution } from "./SpawnExecution";
diff --git a/src/core/execution/FakeHumanExecution.ts b/src/core/execution/FakeHumanExecution.ts
index 0decfd387..d03fd5fb6 100644
--- a/src/core/execution/FakeHumanExecution.ts
+++ b/src/core/execution/FakeHumanExecution.ts
@@ -1,4 +1,4 @@
-import { AllianceRequest, Cell, Difficulty, Execution, MutableGame, MutablePlayer, Player, PlayerInfo, PlayerType, Relation, TerrainType, TerraNullius, UnitType } from "../game/Game"
+import { AllianceRequest, Cell, Difficulty, Execution, MutableGame, Player, PlayerInfo, PlayerType, Relation, TerrainType, TerraNullius, UnitType } from "../game/Game"
 import { PseudoRandom } from "../PseudoRandom"
 import { AttackExecution } from "./AttackExecution";
 import { TransportShipExecution } from "./TransportShipExecution";
@@ -24,7 +24,7 @@ export class FakeHumanExecution implements Execution {
     private active = true
     private random: PseudoRandom;
     private mg: MutableGame
-    private player: MutablePlayer = null
+    private player: Player = null
 
     private enemy: Player | null = null
 
@@ -476,7 +476,7 @@ export class FakeHumanExecution implements Execution {
         return this.mg.bfs(tile, andFN((gm, t) => gm.isLand(t), manhattanDistFN(tile, 10))).size < 50
     }
 
-    owner(): MutablePlayer {
+    owner(): Player {
         return null
     }
 
diff --git a/src/core/execution/MissileSiloExecution.ts b/src/core/execution/MissileSiloExecution.ts
index 85449dc5a..e5834461f 100644
--- a/src/core/execution/MissileSiloExecution.ts
+++ b/src/core/execution/MissileSiloExecution.ts
@@ -1,12 +1,12 @@
 import { consolex } from "../Consolex";
-import { Cell, Execution, MutableGame, MutablePlayer, MutableUnit, Player, PlayerID, UnitType } from "../game/Game";
+import { Cell, Execution, MutableGame, Player, MutableUnit, PlayerID, UnitType } from "../game/Game";
 import { TileRef } from "../game/GameMap";
 
 export class MissileSiloExecution implements Execution {
 
     private active = true
     private mg: MutableGame
-    private player: MutablePlayer
+    private player: Player
     private silo: MutableUnit
 
     constructor(
@@ -31,7 +31,7 @@ export class MissileSiloExecution implements Execution {
         }
     }
 
-    owner(): MutablePlayer {
+    owner(): Player {
         return null
     }
 
diff --git a/src/core/execution/NukeExecution.ts b/src/core/execution/NukeExecution.ts
index b1ae2f519..de181e999 100644
--- a/src/core/execution/NukeExecution.ts
+++ b/src/core/execution/NukeExecution.ts
@@ -1,5 +1,5 @@
 import { nextTick } from "process";
-import { Cell, Execution, MutableGame, MutablePlayer, PlayerID, MutableUnit, UnitType, Player, TerraNullius } from "../game/Game";
+import { Cell, Execution, MutableGame, Player, PlayerID, MutableUnit, UnitType, TerraNullius } from "../game/Game";
 import { PathFinder } from "../pathfinding/PathFinding";
 import { PathFindResultType } from "../pathfinding/AStar";
 import { PseudoRandom } from "../PseudoRandom";
@@ -8,7 +8,7 @@ import { TileRef } from "../game/GameMap";
 
 export class NukeExecution implements Execution {
 
-    private player: MutablePlayer
+    private player: Player
 
     private active = true
 
@@ -76,7 +76,7 @@ export class NukeExecution implements Execution {
         const ratio = Object.fromEntries(
             this.mg.players().map(p => [p.id(), (p.troops() + p.workers()) / p.numTilesOwned()])
         )
-        const attacked = new Map<MutablePlayer, number>()
+        const attacked = new Map<Player, number>()
         for (const tile of toDestroy) {
             const owner = this.mg.owner(tile)
             if (owner.isPlayer()) {
@@ -116,7 +116,7 @@ export class NukeExecution implements Execution {
         this.nuke.delete(false)
     }
 
-    owner(): MutablePlayer {
+    owner(): Player {
         return this.player
     }
 
diff --git a/src/core/execution/PlayerExecution.ts b/src/core/execution/PlayerExecution.ts
index 03851ffdf..45607dcd2 100644
--- a/src/core/execution/PlayerExecution.ts
+++ b/src/core/execution/PlayerExecution.ts
@@ -1,5 +1,5 @@
 import { Config } from "../configuration/Config"
-import { Execution, MutableGame, MutablePlayer, Player, PlayerID, TerraNullius, UnitType } from "../game/Game"
+import { Execution, MutableGame, Player, PlayerID, TerraNullius, UnitType } from "../game/Game"
 import { calculateBoundingBox, getMode, inscribed, simpleHash } from "../Util"
 import { GameImpl } from "../game/GameImpl"
 import { consolex } from "../Consolex"
@@ -9,7 +9,7 @@ export class PlayerExecution implements Execution {
 
     private readonly ticksPerClusterCalc = 20
 
-    private player: MutablePlayer
+    private player: Player
     private config: Config
     private lastCalc = 0
     private mg: MutableGame
@@ -168,7 +168,7 @@ export class PlayerExecution implements Execution {
             consolex.warn('mode player is null')
         }
         for (const tile of tiles) {
-            (modePlayer as MutablePlayer).conquer(tile)
+            (modePlayer as Player).conquer(tile)
         }
     }
 
@@ -201,7 +201,7 @@ export class PlayerExecution implements Execution {
         return clusters
     }
 
-    owner(): MutablePlayer {
+    owner(): Player {
         return this.player
     }
 
diff --git a/src/core/execution/PortExecution.ts b/src/core/execution/PortExecution.ts
index b98913b7d..48278ef3d 100644
--- a/src/core/execution/PortExecution.ts
+++ b/src/core/execution/PortExecution.ts
@@ -1,4 +1,4 @@
-import { AllPlayers, Cell, Execution, MutableGame, MutablePlayer, MutableUnit, Player, PlayerID, TerrainType, UnitType } from "../game/Game";
+import { AllPlayers, Cell, Execution, MutableGame, Player, MutableUnit, PlayerID, TerrainType, UnitType } from "../game/Game";
 import { PathFinder } from "../pathfinding/PathFinding";
 import { PathFindResultType } from "../pathfinding/AStar";
 import { PseudoRandom } from "../PseudoRandom";
@@ -114,7 +114,7 @@ export class PortExecution implements Execution {
         }
     }
 
-    owner(): MutablePlayer {
+    owner(): Player {
         return null
     }
 
@@ -126,7 +126,7 @@ export class PortExecution implements Execution {
         return false
     }
 
-    player(): MutablePlayer {
+    player(): Player {
         return this.port.owner()
     }
 
diff --git a/src/core/execution/SetTargetTroopRatioExecution.ts b/src/core/execution/SetTargetTroopRatioExecution.ts
index 9e8fcb546..a353d8254 100644
--- a/src/core/execution/SetTargetTroopRatioExecution.ts
+++ b/src/core/execution/SetTargetTroopRatioExecution.ts
@@ -1,9 +1,9 @@
 import { consolex } from "../Consolex";
-import { Execution, MutableGame, MutablePlayer, PlayerID } from "../game/Game";
+import { Execution, MutableGame, Player, PlayerID } from "../game/Game";
 
 export class SetTargetTroopRatioExecution implements Execution {
 
-    private player: MutablePlayer
+    private player: Player
 
     private active = true
 
@@ -23,7 +23,7 @@ export class SetTargetTroopRatioExecution implements Execution {
         this.active = false
     }
 
-    owner(): MutablePlayer {
+    owner(): Player {
         return null
     }
 
diff --git a/src/core/execution/ShellExecution.ts b/src/core/execution/ShellExecution.ts
index 234b77d25..7b856e34a 100644
--- a/src/core/execution/ShellExecution.ts
+++ b/src/core/execution/ShellExecution.ts
@@ -1,4 +1,4 @@
-import { Execution, MutableGame, MutablePlayer, MutableUnit, Unit, UnitType } from "../game/Game";
+import { Execution, MutableGame, Player, MutableUnit, Unit, UnitType } from "../game/Game";
 import { PathFinder } from "../pathfinding/PathFinding";
 import { PathFindResultType } from "../pathfinding/AStar";
 import { consolex } from "../Consolex";
@@ -10,7 +10,7 @@ export class ShellExecution implements Execution {
     private pathFinder: PathFinder
     private shell: MutableUnit
 
-    constructor(private spawn: TileRef, private _owner: MutablePlayer, private ownerUnit: Unit, private target: MutableUnit) {
+    constructor(private spawn: TileRef, private _owner: Player, private ownerUnit: Unit, private target: MutableUnit) {
 
     }
 
@@ -53,7 +53,7 @@ export class ShellExecution implements Execution {
         }
     }
 
-    owner(): MutablePlayer {
+    owner(): Player {
         return null
     }
     isActive(): boolean {
diff --git a/src/core/execution/SpawnExecution.ts b/src/core/execution/SpawnExecution.ts
index 25eeb2b09..51dec6038 100644
--- a/src/core/execution/SpawnExecution.ts
+++ b/src/core/execution/SpawnExecution.ts
@@ -1,4 +1,4 @@
-import { Cell, Execution, MutableGame, MutablePlayer, PlayerInfo, PlayerType } from "../game/Game"
+import { Cell, Execution, MutableGame, Player, PlayerInfo, PlayerType } from "../game/Game"
 import { TileRef } from "../game/GameMap"
 import { BotExecution } from "./BotExecution"
 import { PlayerExecution } from "./PlayerExecution"
@@ -44,7 +44,7 @@ export class SpawnExecution implements Execution {
         }
     }
 
-    owner(): MutablePlayer {
+    owner(): Player {
         return null
     }
     isActive(): boolean {
diff --git a/src/core/execution/TargetPlayerExecution.ts b/src/core/execution/TargetPlayerExecution.ts
index b88c47e09..7e40b1ed1 100644
--- a/src/core/execution/TargetPlayerExecution.ts
+++ b/src/core/execution/TargetPlayerExecution.ts
@@ -1,9 +1,9 @@
-import { Execution, MutableGame, MutablePlayer, PlayerID } from "../game/Game";
+import { Execution, MutableGame, Player, PlayerID } from "../game/Game";
 
 export class TargetPlayerExecution implements Execution {
 
-    private requestor: MutablePlayer
-    private target: MutablePlayer
+    private requestor: Player
+    private target: Player
 
     private active = true
 
@@ -23,7 +23,7 @@ export class TargetPlayerExecution implements Execution {
         this.active = false
     }
 
-    owner(): MutablePlayer {
+    owner(): Player {
         return null
     }
 
diff --git a/src/core/execution/TradeShipExecution.ts b/src/core/execution/TradeShipExecution.ts
index 2cf543d12..fe3ca80b7 100644
--- a/src/core/execution/TradeShipExecution.ts
+++ b/src/core/execution/TradeShipExecution.ts
@@ -1,6 +1,6 @@
 import { MessageType } from '../game/Game';
 import { renderNumber } from "../../client/Utils";
-import { AllPlayers, Cell, Execution, MutableGame, MutablePlayer, MutableUnit, Player, PlayerID,  UnitType } from "../game/Game";
+import { AllPlayers, Cell, Execution, MutableGame, MutableUnit, Player, PlayerID,  UnitType } from "../game/Game";
 import { PathFinder } from "../pathfinding/PathFinding";
 import { PathFindResultType } from "../pathfinding/AStar";
 import { distSortUnit } from "../Util";
@@ -11,7 +11,7 @@ export class TradeShipExecution implements Execution {
 
     private active = true
     private mg: MutableGame
-    private origOwner: MutablePlayer
+    private origOwner: Player
     private tradeShip: MutableUnit
     private index = 0
     private wasCaptured = false
@@ -116,7 +116,7 @@ export class TradeShipExecution implements Execution {
         this.index++
     }
 
-    owner(): MutablePlayer {
+    owner(): Player {
         return null
     }
 
diff --git a/src/core/execution/TransportShipExecution.ts b/src/core/execution/TransportShipExecution.ts
index f8d11e640..0de1c358c 100644
--- a/src/core/execution/TransportShipExecution.ts
+++ b/src/core/execution/TransportShipExecution.ts
@@ -1,4 +1,4 @@
-import { Unit, Cell, Execution, MutableUnit, MutableGame, MutablePlayer, Player, PlayerID, TerraNullius, UnitType, TerrainType } from "../game/Game";
+import { Unit, Cell, Execution, MutableUnit, MutableGame, Player, PlayerID, TerraNullius, UnitType, TerrainType } from "../game/Game";
 import { AttackExecution } from "./AttackExecution";
 import { MessageType } from '../game/Game';
 import { PathFinder } from "../pathfinding/PathFinding";
@@ -17,8 +17,8 @@ export class TransportShipExecution implements Execution {
     private active = true
 
     private mg: MutableGame
-    private attacker: MutablePlayer
-    private target: MutablePlayer | TerraNullius
+    private attacker: Player
+    private target: Player | TerraNullius
 
     // TODO make private
     public path: TileRef[]
@@ -133,7 +133,7 @@ export class TransportShipExecution implements Execution {
         }
     }
 
-    owner(): MutablePlayer {
+    owner(): Player {
         return this.attacker
     }
 
diff --git a/src/core/execution/WinCheckExecution.ts b/src/core/execution/WinCheckExecution.ts
index bd3f9372d..953dbe924 100644
--- a/src/core/execution/WinCheckExecution.ts
+++ b/src/core/execution/WinCheckExecution.ts
@@ -1,5 +1,5 @@
 import { EventBus, GameEvent } from "../EventBus"
-import { Execution, MutableGame, MutablePlayer, Player, PlayerID } from "../game/Game"
+import { Execution, MutableGame, Player, PlayerID } from "../game/Game"
 
 export class WinEvent implements GameEvent {
     constructor(public readonly winner: Player) { }
@@ -33,7 +33,7 @@ export class WinCheckExecution implements Execution {
         }
     }
 
-    owner(): MutablePlayer {
+    owner(): Player {
         return null
     }
 
diff --git a/src/core/execution/alliance/AllianceRequestExecution.ts b/src/core/execution/alliance/AllianceRequestExecution.ts
index 17cce82fe..2c3c0502c 100644
--- a/src/core/execution/alliance/AllianceRequestExecution.ts
+++ b/src/core/execution/alliance/AllianceRequestExecution.ts
@@ -1,11 +1,11 @@
 import { consolex } from "../../Consolex";
-import {AllianceRequest, Execution, MutableGame, MutablePlayer, Player, PlayerID} from "../../game/Game";
+import {AllianceRequest, Execution, MutableGame, Player, PlayerID} from "../../game/Game";
 
 export class AllianceRequestExecution implements Execution {
     private active = true
     private mg: MutableGame = null
-    private requestor: MutablePlayer;
-    private recipient: MutablePlayer
+    private requestor: Player;
+    private recipient: Player
 
     constructor(private requestorID: PlayerID, private recipientID: PlayerID) { }
 
@@ -26,7 +26,7 @@ export class AllianceRequestExecution implements Execution {
         this.active = false
     }
 
-    owner(): MutablePlayer {
+    owner(): Player {
         return null
     }
 
diff --git a/src/core/execution/alliance/AllianceRequestReplyExecution.ts b/src/core/execution/alliance/AllianceRequestReplyExecution.ts
index 7e52d6b7c..4efdf7e4d 100644
--- a/src/core/execution/alliance/AllianceRequestReplyExecution.ts
+++ b/src/core/execution/alliance/AllianceRequestReplyExecution.ts
@@ -1,11 +1,11 @@
 import { consolex } from "../../Consolex";
-import { AllianceRequest, Execution, MutableGame, MutablePlayer, Player, PlayerID } from "../../game/Game";
+import { AllianceRequest, Execution, MutableGame, Player, PlayerID } from "../../game/Game";
 
 export class AllianceRequestReplyExecution implements Execution {
     private active = true
     private mg: MutableGame = null
-    private requestor: MutablePlayer;
-    private recipient: MutablePlayer
+    private requestor: Player;
+    private recipient: Player
 
     constructor(private requestorID: PlayerID, private recipientID: PlayerID, private accept: boolean) { }
 
@@ -35,7 +35,7 @@ export class AllianceRequestReplyExecution implements Execution {
         this.active = false
     }
 
-    owner(): MutablePlayer {
+    owner(): Player {
         return null
     }
 
diff --git a/src/core/execution/alliance/BreakAllianceExecution.ts b/src/core/execution/alliance/BreakAllianceExecution.ts
index 9ed2c552a..63ea6c128 100644
--- a/src/core/execution/alliance/BreakAllianceExecution.ts
+++ b/src/core/execution/alliance/BreakAllianceExecution.ts
@@ -1,10 +1,10 @@
 import { consolex } from "../../Consolex";
-import { AllianceRequest, Execution, MutableGame, MutablePlayer, Player, PlayerID } from "../../game/Game";
+import { AllianceRequest, Execution, MutableGame, Player, PlayerID } from "../../game/Game";
 
 export class BreakAllianceExecution implements Execution {
     private active = true
-    private requestor: MutablePlayer;
-    private recipient: MutablePlayer
+    private requestor: Player;
+    private recipient: Player
     private mg: MutableGame
 
     constructor(private requestorID: PlayerID, private recipientID: PlayerID) { }
@@ -31,7 +31,7 @@ export class BreakAllianceExecution implements Execution {
         this.active = false
     }
 
-    owner(): MutablePlayer {
+    owner(): Player {
         return null
     }
 
diff --git a/src/core/game/AllianceImpl.ts b/src/core/game/AllianceImpl.ts
index 3624d06e5..569d247eb 100644
--- a/src/core/game/AllianceImpl.ts
+++ b/src/core/game/AllianceImpl.ts
@@ -1,4 +1,4 @@
-import {MutableAlliance, MutableGame, MutablePlayer, Player, Tick} from "./Game";
+import {MutableAlliance, MutableGame, Player, Tick} from "./Game";
 import {GameImpl} from "./GameImpl";
 import {PlayerImpl} from "./PlayerImpl";
 
@@ -17,11 +17,11 @@ export class AllianceImpl implements MutableAlliance {
         return this.requestor_
     }
 
-    requestor(): MutablePlayer {
+    requestor(): Player {
         return this.requestor_
     }
 
-    recipient(): MutablePlayer {
+    recipient(): Player {
         return this.recipient_
     }
 
diff --git a/src/core/game/AllianceRequestImpl.ts b/src/core/game/AllianceRequestImpl.ts
index eec388ad7..51a4b8cac 100644
--- a/src/core/game/AllianceRequestImpl.ts
+++ b/src/core/game/AllianceRequestImpl.ts
@@ -1,16 +1,16 @@
-import { AllianceRequestUpdate, GameUpdateType, MutableAllianceRequest, MutablePlayer, Player, Tick } from "./Game";
+import { AllianceRequestUpdate, GameUpdateType, MutableAllianceRequest, Player, Tick } from "./Game";
 import { GameImpl } from "./GameImpl";
 
 
 export class AllianceRequestImpl implements MutableAllianceRequest {
 
-    constructor(private requestor_: MutablePlayer, private recipient_: MutablePlayer, private tickCreated: number, private game: GameImpl) { }
+    constructor(private requestor_: Player, private recipient_: Player, private tickCreated: number, private game: GameImpl) { }
 
-    requestor(): MutablePlayer {
+    requestor(): Player {
         return this.requestor_;
     }
 
-    recipient(): MutablePlayer {
+    recipient(): Player {
         return this.recipient_;
     }
 
diff --git a/src/core/game/Game.ts b/src/core/game/Game.ts
index 8a36e0035..38c648abd 100644
--- a/src/core/game/Game.ts
+++ b/src/core/game/Game.ts
@@ -130,7 +130,7 @@ export interface ExecutionView {
 export interface Execution extends ExecutionView {
     init(mg: MutableGame, ticks: number): void
     tick(ticks: number): void
-    owner(): MutablePlayer
+    owner(): Player
 }
 
 export interface AllianceRequest {
@@ -142,8 +142,8 @@ export interface AllianceRequest {
 export interface MutableAllianceRequest extends AllianceRequest {
     accept(): void
     reject(): void
-    requestor(): MutablePlayer
-    recipient(): MutablePlayer
+    requestor(): Player
+    recipient(): Player
 }
 
 export interface Alliance {
@@ -155,7 +155,7 @@ export interface Alliance {
 
 export interface MutableAlliance extends Alliance {
     expire(): void
-    other(player: Player): MutablePlayer
+    other(player: Player): Player
 }
 
 export class PlayerInfo {
@@ -189,7 +189,7 @@ export interface Unit {
 
 export interface MutableUnit extends Unit {
     move(tile: TileRef): void
-    owner(): MutablePlayer
+    owner(): Player
     setTroops(troops: number): void
     info(): UnitInfo
     delete(displayerMessage?: boolean): void
@@ -205,6 +205,7 @@ export interface TerraNullius {
 }
 
 export interface Player {
+    // Basic Info
     smallID(): number
     info(): PlayerInfo
     name(): string
@@ -212,75 +213,30 @@ export interface Player {
     clientID(): ClientID
     id(): PlayerID
     type(): PlayerType
-    units(...types: UnitType[]): Unit[]
-    isAlive(): boolean
-    borderTiles(): ReadonlySet<TileRef>
     isPlayer(): this is Player
-    numTilesOwned(): number
-    sharesBorderWith(other: Player | TerraNullius): boolean
-    incomingAllianceRequests(): AllianceRequest[]
-    outgoingAllianceRequests(): AllianceRequest[]
-    alliances(): Alliance[]
-    allies(): Player[]
-    isAlliedWith(other: Player): boolean
-    allianceWith(other: Player): Alliance | null
-    // Includes recent requests that  are in cooldown
-    // TODO: why can't I have "canSendAllyRequest" function instead?
-    recentOrPendingAllianceRequestWith(other: Player): boolean
-    // How this player feels about other player.
-    relation(other: Player): Relation
-    // Sorted from most hated to most liked
-    allRelationsSorted(): { player: Player, relation: Relation }[]
-    transitiveTargets(): Player[]
-    isTraitor(): boolean
-    canTarget(other: Player): boolean
     toString(): string
-    canSendEmoji(recipient: Player | typeof AllPlayers): boolean
-    outgoingEmojis(): EmojiMessage[]
-    canDonate(recipient: Player): boolean
-    gold(): Gold
-    // Population = troops + workers
-    population(): number
-    workers(): number
-    // Number between 0, 1
-    targetTroopRatio(): number
-    troops(): number
 
-    // If can build returns the spawn tile, false otherwise
-    canBuild(type: UnitType, targetTile: TileRef): TileRef | false
-    lastTileChange(): Tick
-}
-
-export interface MutablePlayer extends Player {
+    // State & Properties
+    isAlive(): boolean
+    isTraitor(): boolean
     largestClusterBoundingBox: { min: Cell, max: Cell } | null
-    // Targets for this player
-    targets(): Player[]
-    // Targets of player and all allies.
-    neighbors(): (Player | TerraNullius)[]
+    lastTileChange(): Tick
+
+    // Territory
     tiles(): ReadonlySet<TileRef>
+    borderTiles(): ReadonlySet<TileRef>
+    numTilesOwned(): number
     conquer(tile: TileRef): void
     relinquish(tile: TileRef): void
-    executions(): Execution[]
-    neighbors(): (MutablePlayer | TerraNullius)[]
-    units(...types: UnitType[]): MutableUnit[]
-    incomingAllianceRequests(): MutableAllianceRequest[]
-    outgoingAllianceRequests(): MutableAllianceRequest[]
-    alliances(): MutableAlliance[]
-    allies(): MutablePlayer[]
-    allianceWith(other: Player): MutableAlliance | null
-    breakAlliance(alliance: Alliance): void
-    createAllianceRequest(recipient: Player): MutableAllianceRequest
-    updateRelation(other: Player, delta: number): void
-    decayRelations(): void
-    target(other: Player): void
-    targets(): MutablePlayer[]
-    transitiveTargets(): MutablePlayer[]
-    sendEmoji(recipient: Player | typeof AllPlayers, emoji: string): void
-    donate(recipient: MutablePlayer, troops: number): void
 
+    // Resources & Population
+    gold(): Gold
+    population(): number
+    workers(): number
+    troops(): number
+    targetTroopRatio(): number
     addGold(toAdd: Gold): void
     removeGold(toRemove: Gold): void
-
     addWorkers(toAdd: number): void
     removeWorkers(toRemove: number): void
     setTargetTroopRatio(target: number): void
@@ -288,9 +244,48 @@ export interface MutablePlayer extends Player {
     addTroops(troops: number): void
     removeTroops(troops: number): number
 
+    // Units
+    units(...types: UnitType[]): MutableUnit[]
+    canBuild(type: UnitType, targetTile: TileRef): TileRef | false
     buildUnit(type: UnitType, troops: number, tile: TileRef): MutableUnit
     captureUnit(unit: MutableUnit): void
 
+    // Relations & Diplomacy
+    neighbors(): (Player | TerraNullius)[]
+    sharesBorderWith(other: Player | TerraNullius): boolean
+    relation(other: Player): Relation
+    allRelationsSorted(): { player: Player, relation: Relation }[]
+    updateRelation(other: Player, delta: number): void
+    decayRelations(): void
+
+    // Alliances
+    incomingAllianceRequests(): MutableAllianceRequest[]
+    outgoingAllianceRequests(): MutableAllianceRequest[]
+    alliances(): MutableAlliance[]
+    allies(): Player[]
+    isAlliedWith(other: Player): boolean
+    allianceWith(other: Player): MutableAlliance | null
+    recentOrPendingAllianceRequestWith(other: Player): boolean
+    breakAlliance(alliance: Alliance): void
+    createAllianceRequest(recipient: Player): MutableAllianceRequest
+
+    // Targeting
+    canTarget(other: Player): boolean
+    target(other: Player): void
+    targets(): Player[]
+    transitiveTargets(): Player[]
+
+    // Communication
+    canSendEmoji(recipient: Player | typeof AllPlayers): boolean
+    outgoingEmojis(): EmojiMessage[]
+    sendEmoji(recipient: Player | typeof AllPlayers, emoji: string): void
+
+    // Trading
+    canDonate(recipient: Player): boolean
+    donate(recipient: Player, troops: number): void
+
+    // Misc
+    executions(): Execution[]
     toUpdate(): PlayerUpdate
 }
 
@@ -322,11 +317,11 @@ export interface Game extends GameMap {
 }
 
 export interface MutableGame extends Game {
-    player(id: PlayerID): MutablePlayer
-    playerByClientID(id: ClientID): MutablePlayer | null
-    players(): MutablePlayer[]
-    allPlayers(): MutablePlayer[]
-    addPlayer(playerInfo: PlayerInfo, manpower: number): MutablePlayer
+    player(id: PlayerID): Player
+    playerByClientID(id: ClientID): Player | null
+    players(): Player[]
+    allPlayers(): Player[]
+    addPlayer(playerInfo: PlayerInfo, manpower: number): Player
     executions(): Execution[]
     units(...types: UnitType[]): MutableUnit[]
     addTileDefenseBonus(tile: TileRef, unit: Unit, amount: number): DefenseBonus
diff --git a/src/core/game/GameImpl.ts b/src/core/game/GameImpl.ts
index 1558d886a..98a9fbf44 100644
--- a/src/core/game/GameImpl.ts
+++ b/src/core/game/GameImpl.ts
@@ -1,5 +1,5 @@
 import { Config } from "../configuration/Config";
-import { Cell, Execution, MutableGame, Game, MutablePlayer, PlayerID, PlayerInfo, Player, TerraNullius, Unit, MutableAllianceRequest, Alliance, Nation, UnitType, UnitInfo, DefenseBonus, GameUpdate, GameUpdateType, AllPlayers, GameUpdates, TerrainType, EmojiMessage } from "./Game";
+import { Cell, Execution, MutableGame, Game, PlayerID, PlayerInfo, Player, TerraNullius, Unit, MutableAllianceRequest, Alliance, Nation, UnitType, UnitInfo, DefenseBonus, GameUpdate, GameUpdateType, AllPlayers, GameUpdates, TerrainType, EmojiMessage } from "./Game";
 import { NationMap } from "./TerrainMapLoader";
 import { PlayerImpl } from "./PlayerImpl";
 import { TerraNulliusImpl } from "./TerraNulliusImpl";
@@ -120,7 +120,7 @@ export class GameImpl implements MutableGame {
         return this.nations_
     }
 
-    createAllianceRequest(requestor: MutablePlayer, recipient: MutablePlayer): MutableAllianceRequest {
+    createAllianceRequest(requestor: Player, recipient: Player): MutableAllianceRequest {
         if (requestor.isAlliedWith(recipient)) {
             consolex.log('cannot request alliance, already allied')
             return
@@ -240,11 +240,11 @@ export class GameImpl implements MutableGame {
         this.execs = activeExecs
     }
 
-    players(): MutablePlayer[] {
+    players(): Player[] {
         return Array.from(this._players.values()).filter(p => p.isAlive())
     }
 
-    allPlayers(): MutablePlayer[] {
+    allPlayers(): Player[] {
         return Array.from(this._players.values())
     }
 
@@ -262,11 +262,11 @@ export class GameImpl implements MutableGame {
     }
 
 
-    playerView(id: PlayerID): MutablePlayer {
+    playerView(id: PlayerID): Player {
         return this.player(id)
     }
 
-    addPlayer(playerInfo: PlayerInfo, manpower: number): MutablePlayer {
+    addPlayer(playerInfo: PlayerInfo, manpower: number): Player {
         let player = new PlayerImpl(this, this.nextPlayerID, playerInfo, manpower)
         this._playersBySmallID.push(player)
         this.nextPlayerID++
@@ -274,14 +274,14 @@ export class GameImpl implements MutableGame {
         return player
     }
 
-    player(id: PlayerID | null): MutablePlayer {
+    player(id: PlayerID | null): Player {
         if (!this._players.has(id)) {
             throw new Error(`Player with id ${id} not found`)
         }
         return this._players.get(id)
     }
 
-    playerByClientID(id: ClientID): MutablePlayer | null {
+    playerByClientID(id: ClientID): Player | null {
         for (const [pID, player] of this._players) {
             if (player.clientID() == id) {
                 return player
diff --git a/src/core/game/PlayerImpl.ts b/src/core/game/PlayerImpl.ts
index 17155a590..def8b093c 100644
--- a/src/core/game/PlayerImpl.ts
+++ b/src/core/game/PlayerImpl.ts
@@ -1,4 +1,4 @@
-import { MutablePlayer, PlayerInfo, PlayerID, PlayerType, Player, TerraNullius, Cell, Execution, AllianceRequest, MutableAllianceRequest, MutableAlliance, Alliance, Tick, AllPlayers, Gold, UnitType, Unit, MutableUnit, Relation, PlayerUpdate, GameUpdateType, EmojiMessage } from "./Game";
+import { Player, PlayerInfo, PlayerID, PlayerType, TerraNullius, Cell, Execution, AllianceRequest, MutableAllianceRequest, MutableAlliance, Alliance, Tick, AllPlayers, Gold, UnitType, Unit, MutableUnit, Relation, PlayerUpdate, GameUpdateType, EmojiMessage } from "./Game";
 import { ClientID } from "../Schemas";
 import { assertNever, closestOceanShoreFromPlayer, distSortUnit, simpleHash, sourceDstOceanShore, within } from "../Util";
 import { CellString, GameImpl } from "./GameImpl";
@@ -18,7 +18,7 @@ class Donation {
     constructor(public readonly recipient: Player, public readonly tick: Tick) { }
 }
 
-export class PlayerImpl implements MutablePlayer {
+export class PlayerImpl implements Player {
 
     public _lastTileChange: number = 0
 
@@ -138,8 +138,8 @@ export class PlayerImpl implements MutablePlayer {
         return this._borderTiles;
     }
 
-    neighbors(): (MutablePlayer | TerraNullius)[] {
-        const ns: Set<(MutablePlayer | TerraNullius)> = new Set();
+    neighbors(): (Player | TerraNullius)[] {
+        const ns: Set<(Player | TerraNullius)> = new Set();
         for (const border of this.borderTiles()) {
             for (const neighbor of this.mg.map().neighbors(border)) {
                 if (this.mg.map().isLake(neighbor)) {
@@ -153,7 +153,7 @@ export class PlayerImpl implements MutablePlayer {
         return Array.from(ns);
     }
 
-    isPlayer(): this is MutablePlayer { return true as const; }
+    isPlayer(): this is Player { return true as const; }
     setTroops(troops: number) { this._troops = Math.floor(troops); }
     conquer(tile: TileRef) { this.mg.conquer(this, tile); }
     relinquish(tile: TileRef) {
@@ -180,7 +180,7 @@ export class PlayerImpl implements MutablePlayer {
         return this.mg.alliances_.filter(a => a.requestor() == this || a.recipient() == this)
     }
 
-    allies(): MutablePlayer[] {
+    allies(): Player[] {
         return this.alliances().map(a => a.other(this))
     }
 
@@ -231,7 +231,7 @@ export class PlayerImpl implements MutablePlayer {
         if (this.isAlliedWith(recipient)) {
             throw new Error(`cannot create alliance request, already allies`)
         }
-        return this.mg.createAllianceRequest(this, recipient as MutablePlayer)
+        return this.mg.createAllianceRequest(this, recipient as Player)
     }
 
     relation(other: Player): Relation {
@@ -310,10 +310,10 @@ export class PlayerImpl implements MutablePlayer {
             .map(t => t.target as PlayerImpl)
     }
 
-    transitiveTargets(): MutablePlayer[] {
+    transitiveTargets(): Player[] {
         const ts = this.alliances().map(a => a.other(this)).flatMap(ally => ally.targets())
         ts.push(...this.targets())
-        return [...new Set(ts)] as MutablePlayer[]
+        return [...new Set(ts)] as Player[]
     }
 
     sendEmoji(recipient: Player | typeof AllPlayers, emoji: string): void {
@@ -361,7 +361,7 @@ export class PlayerImpl implements MutablePlayer {
         return true
     }
 
-    donate(recipient: MutablePlayer, troops: number): void {
+    donate(recipient: Player, troops: number): void {
         this.sentDonations.push(new Donation(recipient, this.mg.ticks()))
         recipient.addTroops(this.removeTroops(troops))
         this.mg.displayMessage(`Sent ${renderTroops(troops)} troops to ${recipient.name()}`, MessageType.INFO, this.id())