UTests pass with Pathfinder2D

Gameboard.ShogiUI.BoardState/Pieces/King.cs

@@ -0,0 +1,35 @@
+using PathFinding;
+using System.Collections.Generic;
+using System.Linq;
+using System.Numerics;
+
+namespace Gameboard.ShogiUI.BoardState.Pieces
+{
+  public class King : Piece
+  {
+    private static readonly List<Path> MoveSet = new List<Path>(8)
+    {
+      new Path(Direction.Up),
+      new Path(Direction.Left),
+      new Path(Direction.Right),
+      new Path(Direction.Down),
+      new Path(Direction.UpLeft),
+      new Path(Direction.UpRight),
+      new Path(Direction.DownLeft),
+      new Path(Direction.DownRight)
+    };
+    public King(WhichPlayer owner) : base(WhichPiece.King, owner)
+    {
+    }
+
+    public override Piece DeepClone()
+    {
+      var clone = new King(Owner);
+      if (IsPromoted) clone.Promote();
+      return clone;
+    }
+    public override ICollection<Path> GetPaths() => Owner == WhichPlayer.Player1
+        ? MoveSet
+        : MoveSet.Select(_ => new Path(Vector2.Negate(_.Direction), _.Distance)).ToList();
+  }
+}