This move is strictly defensive. Black might also have played 9. ... Q Kt
to Q sq., and then from Q sq. to K 3, which would have been a better
manoeuvre.
10. Kt to B sq. 10. B to K 3
11. B to R 4 11. B to Q 2
12. Kt to Kt 3 12. P to Kt 3
Black's defence is somewhat timid. At a previous stage he intended to
exchange his Q Kt against White's B, and now when White "pins" the {357}
Knight with 11. B to R 4, he retires the Bishop, so as to avoid a double
pawn. Now he has to prevent White's Knight from moving to B 5, attacking
the Queen, but in doing so he weakens his King's position for the purpose
of castling on the King's side. _The student should bear in mind that these
pawns are strongest in their original position._