Commentary for black move 15:

MAURICE ASHLEY: Because the exchange of queens it seems there may be some attacking chances still. Deep Blue has captured instead axb5, and Kasparov has recaptured cxb5.

GK MOVE: 15...cxb5

MAURICE ASHLEY: We should note that Kasparov has a dressing room in the back and he often retires to it. There is a television in there so that he can see if a move has been played on the board. So he likes to go back there either because of nervous tension or just give himself a break from the chessboard. Now, Yaz, there are a number of moves in this situation for Deep Blue, different ways to carry out the attackment at the moment he could actually win back a pawn it seems with the move Qe2. But you're exploring a different variation here, the possibility of Qd3 seems to attract you.

YASSER SEIRAWAN: Well, yeah, this is -- first of all, I like this move axb5 in some ways because the computer hasn't just gone ahead and played Qe2 in order to win this pawn on e6. It seems that Deep Blue recognizes that it wants to keep queens on the board, so that already shows sophistication, a sophisticated understanding at least of this position.

MAURICE ASHLEY: Well, Qe2 could still be played -- sorry to interrupt -- it's still possible. And this makes it clear that he wins the pawn back.

YASSER SEIRAWAN: But then the idea would be Deep Blue would say, "Well, the move axb5 cxb5, that trade, that exchange actually helps black in some ways because that bishop on b7 is no longer hemmed in by that pawn on c6. So when you're attacking and especially a direct attack against a king, one of your principal ideas is to open the position. By opening the position we mean forcing the exchange of pawns. So we're just looking now at a possibility of Qd1-d3, attacking the pawn on b5. Garry may play the move Qe7-f6, but I'm just wondering what would happen after a7-a6 c2-c4, and then we can see the effect of what Deep Blue wants to do. bxc4 Qxc4+, Garry's king is in deep trouble, deep trouble. And this is exactly what Deep Blue wants to do is open up the position for his attacking pieces.

MAURICE ASHLEY: This is not the kind of position Kasparov is going to want to play, and he'll have to figure out a way to keep the lines closed and not have to come under the attack of Deep Blue's converging pieces.

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