This crosses Black’s plan of developing the QB at Kt2.
7. … B-Q3 8. Q-B3 P-B3
9. B-Kt5ch, P-B3; 10. KtxP was threatened.
9. P-B3 Castles 10. B-KKt5 B-K2 11. B-Q3
Whatever Black plays now, he must create some weakness in order to provide against White’s Q-R3, BxKt, QxRP, and White’s attack must succeed. The whole of Black’s plan is thus frustrated, as the only reason for abandoning the centre by PxP was the occupation of the long diagonal by the QB. Now the Queen’s side pieces cannot get into play without much difficulty, and by the time they have succeeded it is too late.
Diag. 138
11. … Kt-K1
Intending to intercept the diagonal of the White KB by P-KB4. If Black plays P-KKt3 with the same intention, White plays P-KR4-5 and PxP, and brings the Rook into play.