started working on player moves.

Shogi.Api/Extensions/ContractsExtensions.cs

@@ -49,4 +49,20 @@ public static class ContractsExtensions
 
 	public static Dictionary<string, Piece?> ToContract(this ReadOnlyDictionary<string, Domain.ValueObjects.Piece?> boardState) =>
 		boardState.ToDictionary(kvp => kvp.Key, kvp => kvp.Value?.ToContract());
+
+	public static Domain.WhichPiece ToDomain(this WhichPiece piece)
+	{
+		return piece switch
+		{
+			WhichPiece.King => Domain.WhichPiece.King,
+			WhichPiece.GoldGeneral => Domain.WhichPiece.GoldGeneral,
+			WhichPiece.SilverGeneral => Domain.WhichPiece.SilverGeneral,
+			WhichPiece.Bishop => Domain.WhichPiece.Bishop,
+			WhichPiece.Rook => Domain.WhichPiece.Rook,
+			WhichPiece.Knight => Domain.WhichPiece.Knight,
+			WhichPiece.Lance => Domain.WhichPiece.Lance,
+			WhichPiece.Pawn => Domain.WhichPiece.Pawn,
+			_ => throw new NotImplementedException(),
+		};
+	}
 }