diff --git a/src/client/ClientGameRunner.ts b/src/client/ClientGameRunner.ts
index f4b1ddc68..95561e35f 100644
--- a/src/client/ClientGameRunner.ts
+++ b/src/client/ClientGameRunner.ts
@@ -6,11 +6,16 @@ import { ClientID, GameConfig, GameID, ServerMessage } from "../core/Schemas";
 import { loadTerrainMap } from "../core/game/TerrainMapLoader";
 import {
   SendAttackIntentEvent,
+  SendHashEvent,
   SendSpawnIntentEvent,
   Transport,
 } from "./Transport";
 import { createCanvas } from "./Utils";
-import { ErrorUpdate } from "../core/game/GameUpdates";
+import {
+  ErrorUpdate,
+  GameUpdateType,
+  HashUpdate,
+} from "../core/game/GameUpdates";
 import { WorkerClient } from "../core/worker/WorkerClient";
 import { consolex, initRemoteSender } from "../core/Consolex";
 import { getConfig, getServerConfig } from "../core/configuration/Config";
@@ -171,6 +176,9 @@ export class ClientGameRunner {
         showErrorModal(gu.errMsg, gu.stack, this.clientID);
         return;
       }
+      gu.updates[GameUpdateType.Hash].forEach((hu: HashUpdate) => {
+        this.eventBus.emit(new SendHashEvent(hu.tick, hu.hash));
+      });
       this.gameView.update(gu);
       this.renderer.tick();
     });
diff --git a/src/client/Transport.ts b/src/client/Transport.ts
index c4fd5f700..5cdbeb2fe 100644
--- a/src/client/Transport.ts
+++ b/src/client/Transport.ts
@@ -9,6 +9,7 @@ import {
   Player,
   PlayerID,
   PlayerType,
+  Tick,
   UnitType,
 } from "../core/game/Game";
 import {
@@ -23,6 +24,7 @@ import {
   GameConfig,
   ClientLogMessageSchema,
   ClientSendWinnerSchema,
+  ClientMessageSchema,
 } from "../core/Schemas";
 import { LobbyConfig } from "./ClientGameRunner";
 import { LocalServer } from "./LocalServer";
@@ -107,6 +109,12 @@ export class SendSetTargetTroopRatioEvent implements GameEvent {
 export class SendWinnerEvent implements GameEvent {
   constructor(public readonly winner: ClientID) {}
 }
+export class SendHashEvent implements GameEvent {
+  constructor(
+    public readonly tick: Tick,
+    public readonly hash: number,
+  ) {}
+}
 
 export class Transport {
   private socket: WebSocket;
@@ -159,6 +167,7 @@ export class Transport {
     this.eventBus.on(SendLogEvent, (e) => this.onSendLogEvent(e));
     this.eventBus.on(PauseGameEvent, (e) => this.onPauseGameEvent(e));
     this.eventBus.on(SendWinnerEvent, (e) => this.onSendWinnerEvent(e));
+    this.eventBus.on(SendHashEvent, (e) => this.onSendHashEvent(e));
   }
 
   private startPing() {
@@ -448,6 +457,26 @@ export class Transport {
     }
   }
 
+  private onSendHashEvent(event: SendHashEvent) {
+    if (this.isLocal || this.socket.readyState === WebSocket.OPEN) {
+      const msg = ClientMessageSchema.parse({
+        type: "hash",
+        clientID: this.lobbyConfig.clientID,
+        persistentID: this.lobbyConfig.persistentID,
+        gameID: this.lobbyConfig.gameID,
+        tick: event.tick,
+        hash: event.hash,
+      });
+      this.sendMsg(JSON.stringify(msg));
+    } else {
+      console.log(
+        "WebSocket is not open. Current state:",
+        this.socket.readyState,
+      );
+      console.log("attempting reconnect");
+    }
+  }
+
   private sendIntent(intent: Intent) {
     if (this.isLocal || this.socket.readyState === WebSocket.OPEN) {
       const msg = ClientIntentMessageSchema.parse({
diff --git a/src/client/graphics/layers/EventsDisplay.ts b/src/client/graphics/layers/EventsDisplay.ts
index 223219210..c2b2e15b2 100644
--- a/src/client/graphics/layers/EventsDisplay.ts
+++ b/src/client/graphics/layers/EventsDisplay.ts
@@ -63,7 +63,7 @@ export class EventsDisplay extends LitElement implements Layer {
     ],
     [GameUpdateType.BrokeAlliance, (u) => this.onBrokeAllianceEvent(u)],
     [GameUpdateType.TargetPlayer, (u) => this.onTargetPlayerEvent(u)],
-    [GameUpdateType.EmojiUpdate, (u) => this.onEmojiMessageEvent(u)],
+    [GameUpdateType.Emoji, (u) => this.onEmojiMessageEvent(u)],
   ]);
 
   constructor() {
diff --git a/src/client/graphics/layers/OptionsMenu.ts b/src/client/graphics/layers/OptionsMenu.ts
index af105ce08..80b375f28 100644
--- a/src/client/graphics/layers/OptionsMenu.ts
+++ b/src/client/graphics/layers/OptionsMenu.ts
@@ -107,7 +107,7 @@ export class OptionsMenu extends LitElement implements Layer {
   tick() {
     this.hasWinner =
       this.hasWinner ||
-      this.game.updatesSinceLastTick()[GameUpdateType.WinUpdate].length > 0;
+      this.game.updatesSinceLastTick()[GameUpdateType.Win].length > 0;
     if (this.game.inSpawnPhase()) {
       this.timer = 0;
     } else if (!this.hasWinner && this.game.ticks() % 10 == 0) {
diff --git a/src/client/graphics/layers/WinModal.ts b/src/client/graphics/layers/WinModal.ts
index 6991d8075..7a122bf87 100644
--- a/src/client/graphics/layers/WinModal.ts
+++ b/src/client/graphics/layers/WinModal.ts
@@ -208,7 +208,7 @@ export class WinModal extends LitElement implements Layer {
       }
       this.show();
     }
-    this.game.updatesSinceLastTick()[GameUpdateType.WinUpdate].forEach((wu) => {
+    this.game.updatesSinceLastTick()[GameUpdateType.Win].forEach((wu) => {
       const winner = this.game.playerBySmallID(wu.winnerID) as PlayerView;
       this.eventBus.emit(new SendWinnerEvent(winner.clientID()));
       if (winner == this.game.myPlayer()) {
diff --git a/src/core/Schemas.ts b/src/core/Schemas.ts
index 8ea615139..95d0833dc 100644
--- a/src/core/Schemas.ts
+++ b/src/core/Schemas.ts
@@ -48,7 +48,8 @@ export type ClientMessage =
   | ClientPingMessage
   | ClientIntentMessage
   | ClientJoinMessage
-  | ClientLogMessage;
+  | ClientLogMessage
+  | ClientHashMessage;
 export type ServerMessage =
   | ServerSyncMessage
   | ServerStartGameMessage
@@ -65,6 +66,7 @@ export type ClientPingMessage = z.infer<typeof ClientPingMessageSchema>;
 export type ClientIntentMessage = z.infer<typeof ClientIntentMessageSchema>;
 export type ClientJoinMessage = z.infer<typeof ClientJoinMessageSchema>;
 export type ClientLogMessage = z.infer<typeof ClientLogMessageSchema>;
+export type ClientHashMessage = z.infer<typeof ClientHashSchema>;
 
 export type PlayerRecord = z.infer<typeof PlayerRecordSchema>;
 export type GameRecord = z.infer<typeof GameRecordSchema>;
@@ -268,7 +270,7 @@ export const ServerMessageSchema = z.union([
 // Client
 
 const ClientBaseMessageSchema = z.object({
-  type: z.enum(["winner", "join", "intent", "ping", "log"]),
+  type: z.enum(["winner", "join", "intent", "ping", "log", "hash"]),
   clientID: ID,
   persistentID: SafeString.nullable(), // WARNING: persistent id is private.
   gameID: ID,
@@ -279,6 +281,12 @@ export const ClientSendWinnerSchema = ClientBaseMessageSchema.extend({
   winner: ID.nullable(),
 });
 
+export const ClientHashSchema = ClientBaseMessageSchema.extend({
+  type: z.literal("hash"),
+  hash: z.number(),
+  tick: z.number(),
+});
+
 export const ClientLogMessageSchema = ClientBaseMessageSchema.extend({
   type: z.literal("log"),
   severity: z.nativeEnum(LogSeverity),
@@ -308,6 +316,7 @@ export const ClientMessageSchema = z.union([
   ClientIntentMessageSchema,
   ClientJoinMessageSchema,
   ClientLogMessageSchema,
+  ClientHashSchema,
 ]);
 
 export const PlayerRecordSchema = z.object({
diff --git a/src/core/game/GameImpl.ts b/src/core/game/GameImpl.ts
index 27c721111..a83ad78cd 100644
--- a/src/core/game/GameImpl.ts
+++ b/src/core/game/GameImpl.ts
@@ -241,21 +241,29 @@ export class GameImpl implements Game {
 
     this.execs.push(...inited);
     this.unInitExecs = unInited;
-    this._ticks++;
-    if (this._ticks % 100 == 0) {
-      let hash = 1;
-      this._players.forEach((p) => {
-        hash += p.hash();
-      });
-      consolex.log(`tick ${this._ticks}: hash ${hash}`);
-    }
     for (const player of this._players.values()) {
       // Players change each to so always add them
       this.addUpdate(player.toUpdate());
     }
+    if (this.ticks() % 10 == 0) {
+      this.addUpdate({
+        type: GameUpdateType.Hash,
+        tick: this.ticks(),
+        hash: this.hash(),
+      });
+    }
+    this._ticks++;
     return this.updates;
   }
 
+  private hash(): number {
+    let hash = 1;
+    this._players.forEach((p) => {
+      hash += p.hash();
+    });
+    return hash;
+  }
+
   terraNullius(): TerraNullius {
     return this._terraNullius;
   }
@@ -494,14 +502,14 @@ export class GameImpl implements Game {
 
   sendEmojiUpdate(msg: EmojiMessage): void {
     this.addUpdate({
-      type: GameUpdateType.EmojiUpdate,
+      type: GameUpdateType.Emoji,
       emoji: msg,
     });
   }
 
   setWinner(winner: Player): void {
     this.addUpdate({
-      type: GameUpdateType.WinUpdate,
+      type: GameUpdateType.Win,
       winnerID: winner.smallID(),
     });
   }
diff --git a/src/core/game/GameUpdates.ts b/src/core/game/GameUpdates.ts
index 815136884..db2ac04d2 100644
--- a/src/core/game/GameUpdates.ts
+++ b/src/core/game/GameUpdates.ts
@@ -34,8 +34,9 @@ export enum GameUpdateType {
   BrokeAlliance,
   AllianceExpired,
   TargetPlayer,
-  EmojiUpdate,
-  WinUpdate,
+  Emoji,
+  Win,
+  Hash,
 }
 
 export type GameUpdate =
@@ -49,7 +50,8 @@ export type GameUpdate =
   | DisplayMessageUpdate
   | TargetPlayerUpdate
   | EmojiUpdate
-  | WinUpdate;
+  | WinUpdate
+  | HashUpdate;
 
 export interface TileUpdateWrapper {
   type: GameUpdateType.Tile;
@@ -133,7 +135,7 @@ export interface TargetPlayerUpdate {
 }
 
 export interface EmojiUpdate {
-  type: GameUpdateType.EmojiUpdate;
+  type: GameUpdateType.Emoji;
   emoji: EmojiMessage;
 }
 
@@ -145,6 +147,12 @@ export interface DisplayMessageUpdate {
 }
 
 export interface WinUpdate {
-  type: GameUpdateType.WinUpdate;
+  type: GameUpdateType.Win;
   winnerID: number;
 }
+
+export interface HashUpdate {
+  type: GameUpdateType.Hash;
+  tick: Tick;
+  hash: number;
+}
diff --git a/src/core/game/UnitImpl.ts b/src/core/game/UnitImpl.ts
index 7c3de09a0..8129d9d73 100644
--- a/src/core/game/UnitImpl.ts
+++ b/src/core/game/UnitImpl.ts
@@ -135,7 +135,7 @@ export class UnitImpl implements Unit {
   }
 
   hash(): number {
-    return this.tile() + simpleHash(this.type());
+    return this.tile() + simpleHash(this.type()) * this._id;
   }
 
   toString(): string {
diff --git a/src/server/Client.ts b/src/server/Client.ts
index 4ce9345ac..1765693f2 100644
--- a/src/server/Client.ts
+++ b/src/server/Client.ts
@@ -1,9 +1,12 @@
 import WebSocket from "ws";
 import { ClientID } from "../core/Schemas";
+import { Tick } from "../core/game/Game";
 
 export class Client {
   public lastPing: number;
 
+  public hashes: Map<Tick, number> = new Map();
+
   constructor(
     public readonly clientID: ClientID,
     public readonly persistentID: string,
diff --git a/src/server/GameServer.ts b/src/server/GameServer.ts
index 46434563a..f0b134cd7 100644
--- a/src/server/GameServer.ts
+++ b/src/server/GameServer.ts
@@ -3,11 +3,8 @@ import {
   ClientMessage,
   ClientMessageSchema,
   GameConfig,
-  GameRecordSchema,
   Intent,
   PlayerRecord,
-  ServerPingMessageSchema,
-  ServerStartGameMessage,
   ServerStartGameMessageSchema,
   ServerTurnMessageSchema,
   Turn,
@@ -162,6 +159,12 @@ export class GameServer {
           this.lastPingUpdate = Date.now();
           client.lastPing = Date.now();
         }
+        if (clientMsg.type == "hash") {
+          console.log(
+            `client ${clientMsg.clientID} got hash ${clientMsg.hash} on tick ${clientMsg.tick}`,
+          );
+          client.hashes.set(clientMsg.tick, clientMsg.hash);
+        }
         if (clientMsg.type == "winner") {
           this.winner = clientMsg.winner;
         }