threatening Q-B7.
21. QR-B1 K-Kt2 22. B-K3 B-B3
Black must not exchange his valuable Bishop.
23. P-Kt3 KR-K1 24. B-B2
There is no answer to Black’s threat of doubling the Rooks on the K file. If White plays Q-B2, Black’s Queen effects an entry at Q6, after which he would double his Rooks, and White’s Bishop cannot be defended. After the text move, Black forces the exchange of his two Rooks for the Queen. Generally speaking, this is no disadvantage, but in consequence of the exposed position of the White King, it means a speedy loss for White.
24. … B-B6ch 25. K-Kt1 B-Kt7 26. RxR BxQ 27. RxR Q-Q6!
If now RxB Black plays Q-B6.
28. R-K8
In order to play R-K3 if Black plays BxKt.
28. … Q-B6! 29. KxB Q-R8ch 30. B-Kt1 Q-Kt7ch 31. K-K1 QxBch 32. K-Q2 QxPch Resigns