If Q-B2, White would play R-B1, after which Black could not recapture the KP yet, as the QBP is en prise. 13. … KKtxP; 14. KtxKt, KtxKt; 15. Kt-Q5, Q-Q3; 16. BxKt, QxB; 19. RxP, etc.
13. Castles Q-B2 14. R-B1 P-B3
Again KtxP is not feasible on account of the loss of the QBP, as can be easily seen.
15. B-Kt3 PxP
Black’s game cannot be saved. If l5. … Kt(Kt5)xKP there follows 16. KtxKt, KtxKt; 17. Kt-Q5, Q-Q3; 18. BxKt, PxB; 19. RxB, or 16. … PxKt; 17. Q-R5ch, P-Kt3, 18. Q-R6.
16. P-Kt4!
Now White initiates a brilliant attack, driving it home without giving Black a moment’s rest. If Black takes the pawn, White plays Kt-Q4, with many threats, e.g. P-B4; 18. Kt-Q5, Q-Q3; 19. Kt-K6, or l7. … Kt(Kt5)-B3; 18. Kt-K6, etc.
16. … B-R2 17. BxKtP
The sacrifice is fairly obvious, as White obtains three pawns for the piece, and moreover drives the King into the field of battle. However, this does not detract from the beauty of the game, which is full of brilliant phases.
17. … RPxB 18. KtxKtP Q-Q1