Commentary for white move 17:

And also I want to say that for the defender, the defender has to look at so many threats that it's much easier when you're playing against the computer to be on the attack than you are when you're on the defense, because on the defense, you have to keep Des Moines mind -- keep in mind everything that's possible. Pieces swinging over, pieces coming up and down the board.

DB MOVE: 17 Bf5

MAURICE ASHLEY: I suggested this possibility earlier but for me I see it as a surprising move. And Yaz, you can help me here. First of all, Deep Blue is down a piece for one pawn. It wants to attack, more so than anything else. Recapturing the material especially the e6 pawn is not in the program, at least should not be in the program.

YASSER SEIRAWAN: Unless it's done under favorable circumstances.

MAURICE ASHLEY: Unless it's done under fantastic circumstances. Here, though, it comes as a big surprise to me. Because here the possibility is capturing the bishop and after Rxqueen, maybe even just bishop takes, maybe. The reason being that now, Kasparov has gotten a knight -- in this case you have to give up the f5 pawn, but he's gotten a knight, rook, and bishop, which is numerically 11 points. A rook is five points, a bishop is three and a knight is three. That's 11 points. And what he's giving up is a queen and two pawns. That's also 11 points. The queen is nine and the two pawns, right, is 11.

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