Commentary for white move 10:

MAURICE ASHLEY: He has dropped back.

YASSER SEIRAWAN: We have now predicted the move Bf8-c5 by Deep Blue. One of the ideas in the opening is to castle early, protect your king, but also to bring your pieces to active squares. When we say active squares, the definition is if you bisect the chessboard into two halves, right across from the a4 rank, then you say 32 squares belong to white, 32 squares belong to black, and to activate our pieces we need to control more of the opponent's territory than the opponent controls of ours. So the bishop on f8 clearly needs to move but where to move it. e7, d6, b4 with check. Of which those choices -- which of those choices? Bb4+ is attractive and Bc5 are the two most attractive squares because they control white's territory. We're anticipating one of these two moves. And quite frankly I think Deep Blue has a fine position, although, long-term, we know the bishop on g2 has no counterpart and is very meaningful. In the short-term, the computer has good development.

MAURICE ASHLEY: Well, Mike, you and I didn't like the Ne7-e5 move. It seems to have turned out okay.

MIKE VALVO: That was a knee jerk reaction by me, but now is seems Bb4 check is a good move, because c3 is not possible, because of Nxd3.

MAURICE ASHLEY: Let's look at that. Bb4+. And the normal move here would be to gain a tempo with c2-c3.

AUDIENCE MEMBER: Not every check is a good one but there is the possibility in that case of Nxd3+ and black would just be up a pawn. For example, after the move Ke2 attacking the knight on d3 and now the bishop is also under attack. Black could play a simple move like Nxc1 check, and then Kasparov could resign pretty soon.

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