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Gameboard.ShogiUI.Sockets.ServiceModels/Types/BoardState.cs

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+using System;
+using System.Collections.Generic;
+
+namespace Gameboard.ShogiUI.Sockets.ServiceModels.Types
+{
+  public class BoardState
+  {
+    public Dictionary<string, Piece?> Board { get; set; } = new Dictionary<string, Piece?>();
+    public IReadOnlyCollection<Piece> Player1Hand { get; set; } = Array.Empty<Piece>();
+    public IReadOnlyCollection<Piece> Player2Hand { get; set; } = Array.Empty<Piece>();
+    public WhichPlayer? PlayerInCheck { get; set; }
+    public WhichPlayer WhoseTurn { get; set; }
+  }
+}

Gameboard.ShogiUI.Sockets.ServiceModels/Types/ClientActionEnum.cs

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+namespace Gameboard.ShogiUI.Sockets.ServiceModels.Types
+{
+  public enum ClientAction
+  {
+    ListGames,
+    CreateGame,
+    JoinGame,
+    JoinByCode,
+    LoadGame,
+    Move
+  }
+}

Gameboard.ShogiUI.Sockets.ServiceModels/Types/Game.cs

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+using System.Collections.Generic;
+
+namespace Gameboard.ShogiUI.Sockets.ServiceModels.Types
+{
+  public class Game
+  {
+    public string Player1 { get; set; } = string.Empty;
+    public string? Player2 { get; set; } = string.Empty;
+    public string GameName { get; set; } = string.Empty;
+    /// <summary>
+    /// Players[0] is the session owner, Players[1] is the other person.
+    /// </summary>
+    public IReadOnlyList<string> Players
+    {
+      get
+      {
+        var list = new List<string>(2) { Player1 };
+        if (!string.IsNullOrEmpty(Player2)) list.Add(Player2);
+        return list;
+      }
+    }
+
+    public Game()
+    {
+    }
+    public Game(string gameName, string player1, string? player2 = null)
+    {
+      GameName = gameName;
+      Player1 = player1;
+      Player2 = player2;
+    }
+  }
+}

Gameboard.ShogiUI.Sockets.ServiceModels/Types/Move.cs

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+namespace Gameboard.ShogiUI.Sockets.ServiceModels.Types
+{
+  public class Move
+  {
+    public WhichPiece? PieceFromCaptured { get; set; }
+    /// <summary>Board position notation, like A3 or G1</summary>
+    public string? From { get; set; }
+    /// <summary>Board position notation, like A3 or G1</summary>
+    public string To { get; set; } = string.Empty;
+    public bool IsPromotion { get; set; }
+  }
+}

Gameboard.ShogiUI.Sockets.ServiceModels/Types/Piece.cs

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+namespace Gameboard.ShogiUI.Sockets.ServiceModels.Types
+{
+  public class Piece
+  {
+    public bool IsPromoted { get; set; }
+    public WhichPiece WhichPiece { get; set; }
+    public WhichPlayer Owner { get; set; }
+  }
+}

Gameboard.ShogiUI.Sockets.ServiceModels/Types/WhichPiece.cs

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+namespace Gameboard.ShogiUI.Sockets.ServiceModels.Types
+{
+  public enum WhichPiece
+  {
+    King,
+    GoldGeneral,
+    SilverGeneral,
+    Bishop,
+    Rook,
+    Knight,
+    Lance,
+    Pawn
+  }
+}

Gameboard.ShogiUI.Sockets.ServiceModels/Types/WhichPlayer.cs

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+namespace Gameboard.ShogiUI.Sockets.ServiceModels.Types
+{
+  public enum WhichPlayer
+  {
+    Player1,
+    Player2
+  }
+}