in order to prevent the release of the B by the pawn sacrifice P- B5 and P-B4.
20. … B-Kt2 21. K-B2 K-B1 22. P-R4 B-R3 23. P-R5 B-Kt2 24. P-R6 P-Kt3
By advancing his RP White has weakened Black’s KB3, with the constant threat of establishing his Kt there and of capturing the RP.
25. K-B1
This move is superfluous and probably dictated by time pressure. The proper plan is: Q-QKt2 with the threat of B-B7 or Kt8 and Q- R8ch.
25. … Q-R6
26. Q-QKt2
The end-game is a clear win for White. He plays his Kt to KKt4, threatening to reach B6 or K5. The effect is twofold.
Diag. 166
Black must keep his B at K2 and his K must remain near the KBP. White’s King marches to QKt6 and captures the QB pawns, queening his QKtP. Black cannot prevent the White King from doing this by B-Q1, as White, by attacking Black’s QB4 with his B, could at any time force the B back to his K2. The remainder of the game needs no comment.