21. Q-K2 Q-K2 22. P-Kt4 P-B3
to prevent P-Kt5.
23. R-Kt2 QR-K1 24. R-K1 Q-B2 25. Kt-Q2
intending to play P-B3, thus retarding Black’s P-K5, which is still hanging over White like Damocles’ sword. The move, however, lets in the Knight.
25. … Kt-R5 26. R-R2 P-B4 27. P-B3 P-K5
Now this move is no longer feasible, as White’s brilliant sacrifice demonstrates. To make the move possible, long preparations would have been necessary, such as: R-Kt3, B-Q2-B3, etc.
28. QPxP QPxP 29. KtxKP PxKt 30. QxPch R-Kt3 31. R(R2)-K2
The scene has changed with startling suddenness. White has open files and diagonals for all his forces, whilst Black’s pieces are immobilised. Whatever he plays, Black must lose the piece he has gained.
31. … B-Q3 32. Q-Q3 BxB 33. RxR Q-B5
He cannot play B-Q4 on account of Q-Q4.