Sliding pieces moves are now illegal if it's after the enemy

Sources/Engine/Pieces/Bishop.swift

@@ -22,6 +22,14 @@ final class Bishop: Piece, DiagonalMoves {
 			}
 			if last == nil {
 				legalPositions.append(position)
+				if let square = delegate?.getSquareInfo(on: position),
+					let piece = square.piece
+				{
+					if piece.color != color {
+						delegate?.notify(.piecePinned(from: self, on: piece))
+						last = position
+					}
+				}
 			}
 		}
 	}