Commentary for black move 29:

MAURICE ASHLEY: The only worry that black could have is that bishop again on g2. And certainly he is going to want to control --

DB MOVE: 30...Qg6.

MAURICE ASHLEY: It has offered to exchange queens but in an unusual manner. It has agreed to accept doubled pawns by moving to g6. In its program, it's been told, and we've seen it time and time again, that doubled pawns are bad, no more doubled pawns, and unless there's a reason, a really good reason, avoid doubled pawns. And here Deep Blue is saying, "Don't worry, programmers, I've got it all worked out." (Audience laughter.)

YASSER SEIRAWAN: The programmers are worried.

MAURICE ASHLEY: They must be a little concerned after that last move offering the exchange of queens and the weak pawn and then the rook comes into e7 again with the effect.

SUSAN POLGAR: With less effect, because less pawns remain on the seventh rank. So that's the idea, I guess.

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