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.