13. Castles KR B-B2 14. B-Kt5 P-KR3 15. BxKt PxB
There is nothing in the weakness at Black’s KB3 and KR3 caused by the disappearance of his KKt Pawn, as White has lost his KB. On the contrary the open file should be a distinct asset, for, having a strong centre, Black’s pieces are more mobile and he is more likely to get an attack.
16. Q-K3 K-R2 17. P-KR3
in order to play Kt-R5, which otherwise would be answered by B- Kt5.
17. … KR-Kt1 18. K-R1 P-B4 19. Kt-R5 B-K3
BxP was threatened.
20. R-KKt1 P-B5
Diag. 105
P-K5 would seem to be better, as it opens a diagonal for the KB, and a diagonal, too, for the QB, as White has to exchange the pawns. Indeed Black would soon have obtained a winning advantage, e.g. 20. … P-K5; 21. PxP (Kt-R2, Q-R5; 22. Q-K2, Kt-K4), BPxP; 22. Kt-R2, Q-R5; 23. Q-K2 (P-KKt4 or B-Q1, P-B4), Kt-K4, threatening Kt-Kt5 and Kt-Q6. As it is, White gains a little time, although Black’s position still remains superior.