Commentary for white move 38:

YASSER SEIRAWAN: Now, what I was going to see is it there's a very well known pattern of draw by repetition in these kinds of rook-and-knight endings, and I think that Deep Blue can force a draw after Rg6 --

GK MOVE: 38 Rg6

MAURICE ASHLEY: He has played Rg6 as anticipated. Now, I think Deep Blue can force a draw. Deep Blue can play the move -- how about Nf2-e4, anticipating Rxg7. We are threatening Rxg5, so assume for the moment Rxg7+ Kb6. The back king is squeezed up the board. g5-g6. And I just want to show the kind of pattern, which is now Rd5-d2 with the idea of playing Ne4-c3+ and getting a repetition.

PATRICK WOLFF: I think what's going to happen in this case is white's going to play Re7 to knock it back out and white should be able to scoot the king out.

YASSER SEIRAWAN: Let's take a look. Knight check.

PATRICK WOLFF: King c1. Not, by the way, Ka1 here because --

YASSER SEIRAWAN: Of the famous pattern --

PATRICK WOLFF: -- Rxa2 mate.

YASSER SEIRAWAN: And I can't play the move Re2, unfortunately. But I do have Re3.

MIKE VALVO: And Nf5.

PATRICK WOLFF: See, again what's happening, why we're going through these variations? Because white is doing everything possible to push this guy home, and black is trying to set up some kind of counterplay against the white king. Now, Yasser's idea was if the black rook is on this square, there's a very thematic pattern where black will be able to get a perpetual check by going check, check, check, check back and forth because the white king can never go by this square and can never go into the corner because of this mate. But because of this Re7 white is able to knock the black knight out and that counterplay in this particular position doesn't work.

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