"<a href=""https://www.youtube.com/watch?v=FxHvCbGfHvU&amp;t=9m11s"">9:11</a> - white could push pawn next to white bishop therefore attacking black bishop", then black knight takes rook, white checks king with the rook, black rook takes white rook, white bishop takes queen and checks king, king is forced to move or block with bishop, if he moves then white can take bishop with pawn, blacks knight is stuck