Merged in better-communication (pull request #49)

Better communication

Shogi.Domain/Pieces/Lance.cs

@@ -0,0 +1,31 @@
+using Shogi.Domain.Pathing;
+using System.Collections.ObjectModel;
+
+namespace Shogi.Domain.Pieces
+{
+	internal class Lance : Piece
+	{
+		public static readonly ReadOnlyCollection<Path> Player1Paths = new(new List<Path>(1)
+		{
+			new Path(Direction.Up, Distance.MultiStep),
+		});
+
+		public static readonly ReadOnlyCollection<Path> Player2Paths =
+			Player1Paths
+			.Select(p => p.Invert())
+			.ToList()
+			.AsReadOnly();
+
+		public Lance(WhichPlayer owner, bool isPromoted = false)
+			: base(WhichPiece.Lance, owner, isPromoted)
+		{
+		}
+
+		public override ReadOnlyCollection<Path> MoveSet => Owner switch
+		{
+			WhichPlayer.Player1 => IsPromoted ? GoldGeneral.Player1Paths : Player1Paths,
+			WhichPlayer.Player2 => IsPromoted ? GoldGeneral.Player2Paths : Player2Paths,
+			_ => throw new NotImplementedException(),
+		};
+	}
+}