P-KKt4 would be premature. White would win at once by 10. KtxKtP, PxKt; 11. BxP, as he can attack the Knight a second time by P-KB4 and PxP before Black can either protect it sufficiently or relieve the “pin.”
10. Q-Q2 Kt-Q1 11. P-Q4 B-Kt5 12. Q-K3 BxKt 13. QxB Kt-K3
It would be wrong to play for the gain of a pawn with P-KKt4 and PxP, e.g. 13. … P-KKt4; 14. B-Kt3, PxP; 15. R-K1!, PxP; 16. P- K5, etc.
14. BxKt
Black’s threat was to develop an attack, similar to that described at move 9, with P-KKt4 and Kt-B5.
14. … QxB 15. QxQ PxQ 16. B-B4
in order to exchange the Knight, which is generally superior to a Bishop in an end-game, as mentioned before.
16. … PxP 17. BxKt PxB 18. PxP
Diag. 130