Sliding pieces moves are now illegal if after piece of same color

Sources/Engine/Pieces/Bishop.swift

@@ -8,6 +8,24 @@ final class Bishop: Piece, DiagonalMoves {
 		return getDiagonalMoves(from: position)
 	}
 
+	override func getLegalPosition() {
+		legalPositions = []
+		var last: Square.Position? = nil
+		for position in pseudoLegalPositions {
+			if !isLegal(on: position) {
+				last = position
+				continue
+			}
+
+			if !DiagonalDirection.isLegal(last: &last, current: position) {
+				last = nil
+			}
+			if last == nil {
+				legalPositions.append(position)
+			}
+		}
+	}
+
 	override func isLegal(on pos: Square.Position) -> Bool {
 		super.isLegal(on: pos)
 	}