Commentary for black move 4:

YASSER SEIRAWAN: Not that many in our audience. Keep in mind that the last rule change, literally rule change occurred about 500 years ago with the Cassling and en passant rule, the rule of en passant. And what happened is, as you're struggling in a game of chess, and let's say you're trying to hold on, you're trying to hold onto the position and your opponent hasn't made any progress. The idea is the opponent is given 50 moves in order to win the game. We have what we call the 50-mover rule. Well, some computer programmer sat down and discovered that there is a whole assortment of positions that are winning but cannot be won in 50 moves. And so FIDE, the officially-sanctioned body of chess, the federation internationale des E S C H E C S, ^ changed ^ changes the rules in certain positions because there's a forced made in 128 moves or 225 moves. And they extended the rules from certain positions from 50 moves to 75 moves. Recently, there's been a lot of pitter-patter back and forth, and I don't even today what the current situation is.

MIKE VALVO: I believe it's 50 now, they went back.

YASSER SEIRAWAN: They went back. But at one time the computer has proven that certain positions are won, and they determine that, you know, the player had the right to try to prove a win if they have a winning position. That was especially true of some rook and bishop vs. rook /EPBGDZ.

MAURICE ASHLEY: Let's take a look at the position on the board because it seems as if play has settled down and Kasparov is beginning to think about the last move by Deep Blue, a2-a4, and this is looking like his first real think of the game. I don't think the watch has come off, though.

AUDIENCE MEMBER: Yeah.

MAURICE ASHLEY: The watch is off. I missed that.

AUDIENCE MEMBER: The first move.

MAURICE ASHLEY: He did? Okay. So he's serious about that one and she's showing that right away and he's in a deep think trying to figure out what to do. Yaz, why don't you break this position down for us. (Camera shows watch on the table.) (Laughter.)

MAURICE ASHLEY: They didn't show me the watch. I slipped up on that one. Give us a little handle on what's happening here in this position.

MAURICE ASHLEY: Well, I would love to --

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