3. … Kt-QB3
White can exchange this Knight later on, and thus make P-K5 possible as soon as he should deem it advisable to drive the Black Knight from his KB3, where the same is bound to develop sooner or later. It is perhaps wise to prevent P-K5 by Q-B2 instead of the move in the text. This is an old defence, introduced by Paulsen. Though it retards the development of Black’s minor pieces, it produces a strong defensive position, and the opening of the QB file gives attacking chances on the Queen’s side. The defence might run like this: 3. … P-QR3; 4. P-Q4, PxP; 5. KtxP, Q-B2; 6. B-K3, Kt-KB3; 7. B-K2, B-K2; 8. Castles, P-QKt4 followed by B-Kt2, P-Q3, QKt-Q2, etc.
4. P-Q4 PxP 5. KtxP P-QR3 6. KtxKt KtPxKt 7. B-Q3 P-Q4 8. Castles Kt-B3 9. B-KB4 B-Kt5
Diag. 142
As White can force Black to play P-Kt3, a weakening move, by P-K5 and Q-Kt4, Black should have played P-Kt3 at once, so as to have Kt-R4 in answer to P-K5, thus keeping one piece for the defence of the King’s side. The latter is in jeopardy after the move in the text, and White’s attack succeeds.
10. P-K5 Kt-Q2 11. Q-Kt4 P-Kt3 12. KR-K1 P-QB4
Of course Black must not accept the sacrifice of the exchange by playing P-Q5. After 13 Kt-K4, BxR; 14 Kt-Q6ch, K-B1; 15 R x B, Black is in a mating net, from which there is no escape, as he has no time to collect sufficient forces for the defence. The move in the text does not stem the tide either, and White quickly forces the win by a beautiful combination.
13. P-QR3 B-R4 14. B-KKt5 Q-Kt3
Q-B2 leads to the same conclusion.