11. … P-Q4 12. B-K3
White has the development of the B gratis, as Black must lose time with the Queen.
12. … Q-Q3 13. B-KB4 Q-KB3 14. QxP!!
Black being behind with his development is already threatened by sacrificial combinations. If he takes the Bishop he loses by 15. B-Kt5ch, K-B1; 16. Q-Q8ch!, BxQ; 17. R-K8 mate, or l5. … P-B3; 16. BxPch, and so on.
14. … P-B3 15. Q-K4 B-K3 16. R-K3 B-QB4
Here Black might have castled on the Queen’s side, but R-Q1 would have had much the same sequel as in the actual game.
17. B-K5 Q-R3
18. R-Kt3 B-KB1
A sorry retreat. But after Q-Q7, which may have been Black’s original intention, White plays R-KB1, threatening B-KB4.
19. R-Q1
This move completes White’s development, and only seems to give Black a chance of castling. However, Black has no satisfactory continuation.