protected override bool IsValidRule(
PieceBase piece,
Position newPosition,
Chessboard chessboard)
{
var(filesToMove, ranksToMove) = piece.GetDistanceTo(newPosition);
return(filesToMove != 0 || ranksToMove != 0);
}
protected override bool IsValidRule(
PieceBase piece,
Position newPosition,
Chessboard chessboard) => chessboard
.GetPiece(newPosition)
.Fold(true)(otherPiece => !piece.SameColor(otherPiece));
