Yep

Shogi.UI/Shared/ShogiApi.cs

@@ -52,7 +52,7 @@ public class ShogiApi(HttpClient httpClient)
 	/// <summary>
 	/// Returns false if the move was not accepted by the server.
 	/// </summary>
-	public async Task<bool> Move(string sessionName, MovePieceCommand command)
+	public async Task<bool> Move(Guid sessionName, MovePieceCommand command)
 	{
 		var response = await httpClient.PatchAsync(Relative($"Sessions/{sessionName}/Move"), JsonContent.Create(command));
 		return response.IsSuccessStatusCode;