Author: Gareth McCaughan
Date: 17:34:39 06/25/00
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On June 24, 2000 at 09:00:41, Robert Hyatt wrote: > I really don't remember the details for Crafty's solution. However, I did > post the output here so it should be findable. I only remember that the > score jumped significantly with a fail high at depth 17 or so, although > that _could_ be a positional sacrifice score gain, of course. Crafty 17.6 on my machine fails high on Rb4 at ply 18. When it resolves it, it reckons the score is about 2 in Black's favour. The PV shown on my machine at the moment (some way through ply 23; my machine had nothing more important to do...) is: ... Rb4 ; cxb4 a4 ; b5+ Kxb5 ; Ba3 c3 ; Re2 Kc4 ; f4 Kxd4 ; f5 Ba6 ; Rh2 exf5 ; e6 Bb5 ; Rh8 b2 ; Rh4+ Ke5 ; Rb4 f4+ ; Kf2 Kxe6 ; Bxb2 cxb2 ; Rxb5. (Of course the final position here is a huge win for Black.) It seems to me, though, that the only way to tell whether it's "understood" the position would be to understand why it didn't choose the other possible moves... Incidentally, after thinking for an hour (at which point it's just starting to think about ply 15) about the position after ...Ba6, it's less enthusiastic about the prospects for Black, giving an eval of about -1. The PV is: Rh2 exf5 ; e6 Bc4 ; e7 Bb5 ; Rh4+ Kd3 ; Rb4 Bc6 ; Rb8 Kd2 ; Kg2 Bd7 ; Rd8 Bb5 ; Rxd5+. The last few moves here are obviously rubbish. And after thinking for an hour about the position after Rh2 exf5; e6, it again reckons about -1, with PV ...Ke3 ; Bc1+ Kd3 ; Kf4 Bb5 ; Ke5 d4 ; e7 Kc4 ; Ba3 c2 ; Rh8 Kc3 ; Rc8+ Kd3 ; Bb2 Ke3 ; e8=Q Bxe8 ; Rxe8. Again, the last few moves are rubbish.
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