[C] Threatening to win Q. B. P. or take Kt. with Kt., winning Q. P.
[D] If Black had played B. to Q. R's 3d, to prevent White Castling on King's side, White would have won a piece by P. to Q. R's 4th.
[E] A premature move.
[F] The best move.
[G] Better than taking Kt., as White would then have opened the Rook's file.
[H] Better than P. takes P.
[I] The best move.
[J] Intending to advance Q. B. P. A strong move.
[K] An impudent move, in the face of such an attack.
[L] A strong move.