Commentary for white move 16:

MURRAY CAMPBELL: Deep Blue always tries to play the move that leads to the highest scoring position. And it numerically weights various features of the chess position, adds them together to come up with a value for a chess position. And on the scale typically a pawn would be worth about a hundred. A bishop or a knight would be worth about three and a quarter, so 325 points, and so on. And then there's adjustments made to those scores based on how good or how bad the pieces are. So this -- GK MOVE: 16 H b1

MURRAY CAMPBELL: -- so this is significantly bad --

MAURICE ASHLEY: Kasparov has moved Rb1, and it seemed to make you jump in your chair, Yasser.

YASSER SEIRAWAN: The idea Ra1-b1 is pretty straightforward. We know that white has gained space on the queen-side so the move Rb1 /PR-PS a possibility of b4xc5 which would open up the b-file. I had actually expected Kasparov to mix the pattern of the game. In looking at the game, just in strategical terms for a moment, we see that the center is really locked up. Once a center is locked up like that,, the play on the flanks is the dominant feature of the position. So a move like Ra1-b1 on the queen-side flank is a good idea. Another idea I thought was worth pursuing was the idea of playing h2-h3, dropping the king hin the H-pawn with the move Kg1-h2, again with the idea of preparing the pawn storm on the queen-side -- king-side. I really like that idea of an avalanche, of trying to get those pawns pushed. And I wanted to ask Murray about that a bit. I mean we know the computer is phenomenal, 200 million moves a second, things like that, but is it aware of a coming pawn storm? Does it see a pawn avalanche and understand that this could be in extreme danger?

MURRAY CAMPBELL: It certainly knows about pawn storms, and the negative consequences of them. (Audience laughter.)

YASSER SEIRAWAN: Okay.

MURRAY CAMPBELL: It's been on the losing side of pawn storm situations in our test games, so that's one thing we've taken steps to deal with, but in a position this closed and being played this carefully by white, it's hard to product -- you know, he's shifting from side to side. It's possible that -- you know, it's hard to predict where the pawn storm is coming. It could be on either side of the board. It's a very tricky position.

MAURICE ASHLEY: Are you worried when you see a pawn storm on the board?

MURRAY CAMPBELL: I was until yesterday.

MAURICE ASHLEY: Sunday.

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