diff --git a/OpenRA.Game/Network/OrderIO.cs b/OpenRA.Game/Network/OrderIO.cs
index 82819aa8e1..41baf3d4bd 100644
--- a/OpenRA.Game/Network/OrderIO.cs
+++ b/OpenRA.Game/Network/OrderIO.cs
@@ -31,13 +31,14 @@ namespace OpenRA.Network
 			return ret;
 		}
 
-		public static byte[] SerializeSync(int sync)
+		public static byte[] SerializeSync(int sync, ulong defeatState)
 		{
-			var ms = new MemoryStream(1 + 4);
+			var ms = new MemoryStream(1 + 4 + 8);
 			using (var writer = new BinaryWriter(ms))
 			{
 				writer.Write((byte)OrderType.SyncHash);
 				writer.Write(sync);
+				writer.Write(defeatState);
 			}
 
 			return ms.GetBuffer();
diff --git a/OpenRA.Game/Network/OrderManager.cs b/OpenRA.Game/Network/OrderManager.cs
index c8296d5f56..fad36e8953 100644
--- a/OpenRA.Game/Network/OrderManager.cs
+++ b/OpenRA.Game/Network/OrderManager.cs
@@ -192,9 +192,16 @@ namespace OpenRA.Network
 				UnitOrders.ProcessOrder(this, World, order.Client, order.Order);
 
 			if (NetFrameNumber + FramesAhead >= GameSaveLastSyncFrame)
-				Connection.SendSync(NetFrameNumber, OrderIO.SerializeSync(World.SyncHash()));
+			{
+				var defeatState = 0UL;
+				for (var i = 0; i < World.Players.Length; i++)
+					if (World.Players[i].WinState == WinState.Lost)
+						defeatState |= 1UL << i;
+
+				Connection.SendSync(NetFrameNumber, OrderIO.SerializeSync(World.SyncHash(), defeatState));
+			}
 			else
-				Connection.SendSync(NetFrameNumber, OrderIO.SerializeSync(0));
+				Connection.SendSync(NetFrameNumber, OrderIO.SerializeSync(0, 0));
 
 			if (generateSyncReport)
 				using (new PerfSample("sync_report"))
diff --git a/OpenRA.Game/Server/ProtocolVersion.cs b/OpenRA.Game/Server/ProtocolVersion.cs
index 0a491f1829..83964c861b 100644
--- a/OpenRA.Game/Server/ProtocolVersion.cs
+++ b/OpenRA.Game/Server/ProtocolVersion.cs
@@ -25,6 +25,8 @@ namespace OpenRA.Server
 		// Order types are:
 		// - 0x65: World sync hash:
 		//   - Int32 containing the sync hash value
+		//   - UInt64 containing the current defeat state (a bit set
+		//     to 1 means the corresponding player is defeated)
 		// - 0xBF: Player disconnected
 		// - 0xFE: Handshake (also used for ServerOrders for ProtocolVersion.Orders < 8)
 		//   - Length-prefixed string specifying a name or key
@@ -66,6 +68,6 @@ namespace OpenRA.Server
 		// The protocol for server and world orders
 		// This applies after the handshake has completed, and is provided to support
 		// alternative server implementations that wish to support multiple versions in parallel
-		public const int Orders = 10;
+		public const int Orders = 11;
 	}
 }