PawnSac: Black to play: _?_
click for larger view At the moment, both black knights are pinned, but White's 2.f4 has exposed his kingside, and black has an arrow aimed right down the dark diagonal, yielding him a significant tactical advantage.
In the game black played 8...Be6, presumably to shield the king and guard the D pawn BUT he could have played more sharply with.. < 8. ..0-0! > 
click for larger view This unpins both knights, gives him stronger grasp of the vital d4 square, especially after ..Nf5, as well as dangerous threats on the open E file. White will be scrambling to avoid a rook pin and get his king to safety. If needed, black could still play ..Be6 but reserves the option of a nasty pin ..Bg4! if combined with ..Nd4. The point is that ..0-0 opens up more tactical possibilities, and my instinct says this will cost white at least a piece. For example.. If he tries to shield the kingside against the Bc5 with..
9. Be3 Bxe3 10. Qxe3 [disconnecting Q & B] Qa5+ 11. Nc3 d4 12. Nxd4 Nd5! bam. Then if 13. Nb3 Qxb5! 14. Nxd5 Qxd5. Notice if 14.Nxb5 Nxe3 holds the king in place while hitting c2. In this manner black stays one step ahead of white the whole time! If on the other hand white tries to avoid the fork and trade off the Bishop with 9.Bxc6?
then ..Nxc6 threatens a royal family shish-ka-bob on the E file with ..Re8 so white is running for cover with his K or must self pin a piece to save the Q. It would look like this.. 9.Bxc6 Nxc6 10.Be3 Bxe3 11.Qxe3 Re8 12.Ne5 f6 or maybe 12.Qxe8+ Qxe8+ 13. Kf2 Anyway.. Kieseritzky gave us some interesting opening theory, but I think in this instance he drifted into unfamiliar territory and got slice and diced. That's my take on it. | 
Kibitzing
Annotations by 
