12. P-KKt4 Kt-B2 13. Kt-Kt3
Here it was necessary to play R-B2 in order to play the QR to KB1 before Black could manage to drive the Kt to Q1 by P-QKt4-5.
13. … P-QKt4
14. Kt-Q1?
It would still have been better to play QR-K1 and to leave the Queen’s side to itself as long as possible after P-Kt5, 15. Kt- Q1, in order to start an assault on the King’s side with P-B5, P- KR4 and P-Kt5. After the text move the Queen’s Rook remains shut in.
14. … QR-Kt1 15. Kt-K2
in order to play P-B3 and P-Q4. The whole plan, however, is inconsequent, as he has started an attack on the King’s side. Now he suddenly opens up files on the Queen’s side where Black has assembled superior forces. The result is that White gets into trouble on both wings, for as soon as he gives up his King’s side attack, the advanced pawns there, as one knows, are only a source of weakness.
15. … P-Kt5 16. P-B3 PxP 17. PxP Q-B1 18. P-Q4 PxP 19. PxP Q-R3 20. R-B1 Kt-Kt4 21. P-Q5
Diag. 143
This shuts in the White KB altogether, and at the same time opens the diagonal of Black’s KB. Therefore, on principle alone the move is questionable. In effect it gives Black an opportunity for a beautiful winning combination. Only P-K5 was worth considering, as then the opposing Bishop would have been shut in and White’s own diagonal opened.