19. R-QB2 Q-B3
Now the attack shown in the last note could be answered with Q- R5.
20. Kt-Kt4
Here P-KKt4 could be answered by Kt-Q5, e.g. 21. P-Kt5, Q-Kt3; 22. R-Kt3, P-B4.
20. … Q-Kt3 21. R-Kt3 P-B4 22. Kt-K5 Q-K3 23. KtxKt KtxKt 24. P-K5 Kt-Kt5!
This prevents the Rook from occupying the Q file which is about to be opened.
25. R-B4 PxP
26. Q-R1 Q-Q2!
If now QxP, Black plays R-B2 with unanswerable threats of R-K1 or Q1.
27. Kt-B3 PxP 28. Kt-K5 Q-K2 29. RxKBP QR-K1 30. Kt-B4 Q-K8ch 31. R-B1 QxQ 32. RxQ KtxP 33. P-R3 P-B5 34. R-Q3 Kt-Kt5 35. R-Q7 P-B6! 36. PxP RxP 37. RxRP Kt-Q6
threatens mate in six.