public static BoardLocation MoveRight(this BoardLocation location, Colours colour, int squares = 1)
 => SafeCreate(location.X + (ChessGame.DirectionModifierFor(colour) * squares), location.Y);
 public static BoardLocation MoveForward(this BoardLocation location, Colours colour, int squares = 1)
 => SafeCreate(location.X, location.Y + ChessGame.DirectionModifierFor(colour) * squares);