Commentary for white move 11:

MAURICE ASHLEY: Fritz has decide to do play the move Bb4+ to test Kasparov's response. I think Fritz -- excuse me -- Deep Blue has played this move. Deep Blue has played Bb4+. And I doubt Deep Blue thinks Kasparov is going to play c3.

GK MOVE: 11 Nd2

MAURICE ASHLEY: Kasparov has played the much more natural move bishop to --

AUDIENCE MEMBER: No! Knight.

MAURICE ASHLEY: Knight b1-d2 has been played.

YASSER SEIRAWAN: Blocking the check. And so here we have it. On the lower screen there, we see that after the move -- boy, it's moving around -- right now, Deep Blue has 48 possible moves. 48 possible legal moves. That's in that lower screen there. It's going through each and every one of those possibilities, and it's going to select what it believes to be the best choice out of the 48 possible. Right next to it is you see the depth chart. What that means is that -- actually, before I make a fool of myself, Mike, why don't you tell the audience what the depth chart means.

MIKE VALVO: Let's way till Frederic comes back. I'm not really sure what that means.

YASSER SEIRAWAN: Okay, I'll take a guess.

MIKE VALVO: It's supposed to mean --

YASSER SEIRAWAN: The number of ply.

MIKE VALVO: The number of ply that it's going into but he said something which doesn't quite make sense to me here. I don't know why there's two numbers. Usually it would say 9, which would mean 9 ply.

YASSER SEIRAWAN: 10 of 10 ply. What a ply refers to as a half move. So if I make a move and my opponent responds, that's two ply. So what the computer is doing is analyzing every possible ply for five moves, five complete moves, or ten ply. Below that, you have a little toolbar, and the toolbar is a visual aid to say who's doing what to whom, who has the advantage in the view of Fritz. Red is for advantage for white. Green is for advantage to black. And, finally, above that you have a numerical value --

MAURICE ASHLEY: Actually green is white and red is black.

YASSER SEIRAWAN: Just reverse everything I just said. And above that you have a numerical value. You have 38. What that means is that in this particular position, Fritz thinks that I believe white --

MAURICE ASHLEY: White.

YASSER SEIRAWAN: -- is doing very well.

MAURICE ASHLEY: Doing very nice.

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