Author: Robert Hyatt
Date: 19:14:29 10/29/97
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On October 29, 1997 at 21:02:27, Willie Wood wrote: > >On October 29, 1997 at 20:31:20, Robert Hyatt wrote: > >>>> >>>>Had a chance to study this this morning. Be3 leads to a worse position, >>>>Crafty thinks. here is the PV: >>>> >>>> 11-> 1:18 -0.175 Be3 Ke6 Rxc7 Nxb7 Rc6+ Kf7 Kf1 Rh1+ >>>> Ke2 Rxd1 Kxd1 Nxa5 Rc7+ Ke6 b4 >>>> >>>>while Bd8 looks better (to crafty): >>>> >>>> 11-> 1:20 0.087 Bd8 Nb5 Bh4 Nd4 Rc5 Nxb7 Rxe5 Kd6 Rb5 >>>> Kc6 Rb6+ Kc7 Rxd4 Nxa5 >>>> > > >I looked at this further, and let me make a couple of points. First, on >35. Bd8, 36... Nd4 was not black's best, and it's not what he played >(g5). I don't think you'd get that positive eval with g5. > >Second, for 35. Be3, 38...rh1+ is not black's best either. But the real >point is that 41. Rc7+ is not the right move, rather Rc5, giving a +0.5 >score or thereabouts. > >So, I do think in this instance at least, that Bd8 was inferior, and Be3 >was the move. > >WW This is simpler than you think. After black played g5, crafty's eval went *up*, and not down. IE it was happier to keep the queenside majority for a while than to save the bishop and lose those pawns. Most likely misguided in this position, although if the pawns could advance, this would probably be perfectly o.k. But here, they can't, they don't, and they are still going to be lost. I've worried about this sort of thing happening. I've seen more than one game where a pair of connected passed pawns would cause crafty to become excited, even to the point of sacrificing a piece for two pawns, if it ends up with a pair of connected passers. in general, it probably works 80% of the time... but it probably needs to be more carefully qualified to avoid doing it at the wrong time as well. As I said on multiple occasions, the "speculative" nature of Crafty was going to undo it in one or more games. Here it did. It was fortunate to draw. This caused a problem in another game also. Maybe that will be it for the tournament, maybe not. It's played fine tactically, and ok positionally for the most part. But on occasion, it has gone out of line.
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