Figure[White to move]

Now a more dramatic use of the same logic. Does White have the kernel of a discovered attack? Not yet; but he can form the kernel by moving his rook into his bishop’s path with check via Rxg7+, forcing Black’s king to move to h8. Notice how the position of Black’s king parallels the position of White’s king in the previous example: it is about to be hit by a discovered check, and it has just one flight square. White unmasks a bishop check and at the same time takes Black’s bishop with RxB. Black has to move his king to g8. Then White returns his rook to g7, forcing Black's king back to h8—and resetting the pattern. Again White unmasks the bishop, and this time he takes Black’s knight with RxN+. Black moves his king back to g8, and so forth. White just slides his rook back and forth, alternately putting Black’s king in check and cleaning out Black's holdings on the seventh rank. Since every White move puts Black back in check, he has no time to stop the carnage. After White finally reaches Black’s second bishop with RxBa7, and Black moves his king yet again to g8, White this time does not return to check the king; he instead administers the coup de grace with RxQ.