The logical move would have been B-K3, to enforce P-Q4. Black is then very well developed, whilst White labours under a somewhat undeveloped Queen’s side. An attempt to exert pressure in the centre with P-Q4 in order to prevent Black’s P-Q4 would be belated. Black would gain the advantage by: l4. … KPxP; 15. PxP, PxP; 16. KtxP, KtxKt; 17. QxKt, Kt-Kt5! Nor would B-Kt5 before Kt-K3 be more successful; after B-K3; 14. Kt-K3, QR-Q1; 15. P-Q4, BPxP; 16. PxP, PxP; 17. KtxP, KtxKt; 18. QxKt, Q-B4, Black has the better chances in the end-game. The move in the text is not good because, as we saw before, the Bishop is wanted on the other diagonal to cover the square at KB4.
14. Kt-B5 KR-K1 15. B-Kt5 Kt-Q2
Even now it was desirable to aim at P-Q4, therefore QR-Q1 was preferable.
16. B-Kt3
The position of the White pieces points to a dangerous menace to the opposing King’s side.
16. … Kt-B1
17. B-Q5!!
The beginning of a brilliant combination. BxKt is threatened, and Black must first cover his B at K2.
17. … Kt-Kt3
18. BxB KKtxB
QKtxB is not feasible, because of BxB and KtxQP.
19. BxPch!! KxB 20. Kt-Kt5ch