yep

Gameboard.ShogiUI.Sockets/Models/User.cs

@@ -0,0 +1,18 @@
+using System;
+
+namespace Gameboard.ShogiUI.Sockets.Models
+{
+  public class User
+  {
+    public static readonly string GuestPrefix = "Guest-";
+    public string Name { get; }
+    public Guid? WebSessionId { get; }
+    public bool IsGuest => Name.StartsWith(GuestPrefix) && WebSessionId.HasValue;
+
+    public User(string name, Guid? webSessionId = null)
+    {
+      Name = name;
+      WebSessionId = webSessionId;
+    }
+  }
+}