Commentary for white move 12:

YASSER SEIRAWAN: Well, Garry's got problems, and -- (Audience laughter.) Garry does have problems in this position. The first thing he's got to do is address his development. He hopes that he's not going to get run over in the center and his king. For example, we could try to understand Garry's hopes after the move Ne5 by Deep Blue. In general it's a bad idea to trade attacking pieces for defending pieces, so the move Ne5 is an unlikely choice. It does, however, threaten Ne5xc6 checkmate. So that after Nxe5 again we would see an unlikely choice in dxe5.

DB MOVE: 12 a4

MAURICE ASHLEY: Before that could even settle itself as a positional concept, Deep Blue has instantly moved, seeking to undermine the b5 pawn with the move a2-a4, and that pawn will have to make a decision sometime soon.

GK MOVE: 12...Bb7

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