20. R × Kt P - K Kt 3
21. Q - R 4 K - Kt 2
22. Q - Q 4 P - B 4

Forced, as White threatened P × K P, and also Q × P

23. Q - B 3 P - Kt 3

Q - Q 3 was better. But Black wants to tempt White to play P × P, thinking that he will soon after regain his Pawn with a safe position. Such, however, is not the case, as White quickly demonstrates. I must add that in any case Black's position is, in my opinion, untenable, since all his pieces are tied up for the defence of a Pawn, while White's pieces are free to act.

24. P × P B - B 1
25. B - K 2 !

The deciding and timely manœuvre. All the Black pieces are useless after this Bishop reaches Q 5.

25. ........ B × P
26. B - B 3 K - B 2
27. B - Q 5 Q - Q 3