Author: Andreas Stabel
Date: 05:32:03 03/09/00
Go up one level in this thread
On March 09, 2000 at 07:31:15, Bernhard Bauer wrote: >On March 08, 2000 at 20:19:48, Bruce Moreland wrote: > >>On March 08, 2000 at 16:10:18, Côme wrote: >> >>>On March 08, 2000 at 15:41:45, Bruce Moreland wrote: >> >>>>Are you sure that 1. ... c5 is the best continuation? What about 1. ... Bf6 2. >>>>Be5 Kg7? >> >>>After 1. ... Bf6 ; Be5 and Kg7, white IMHO can play Bxf6+ and White position is >>>probably winning because he has a pawn up and the black king is misplaced. >>>Have you try this position on ferret ? >> >>No, that's its plan after thinking for 24 hours on this on a crusty old machine. >> The move might be bad, but just by looking at it with my eyeball it's an >>interesting alternative to 1. ... c5. >> >>You are right that white is a pawn up and is better, but the implication behind >>my program choosing this continuation is that it has figured out how to do the >>same or better against 1. ... c5. Its score is +1.35. >> >>I think this is an interesting problem, but very prone to misinterpretation. >>There are two aspects: >> >>1) Finding the move in the first place, which involves discovering that the rook >>can't be taken, and preferring the resulting position. >> >>2) Deciding that in the ensuing tactics, white has significant material >>advantage or a forced mate. >> >>You've gotten a lot of replies from people who have found programs that can get >>as far as the first aspect of this, and want to stop there, satisfied, but so >>far nobody has found a convincing crush. Are you sure that one exists? >> >>bruce > >Here is what Crafty did on a 2xP3-450 with modified (lowered) extensions. > > (4) 16-> 77:05 0.00 1. Rc4 Rd7 2. Kg2 Qd8 3. Rh1 Bd6 4. > Rc1 Be7 > (3) 17 87:17 -0.04 1. Rc4 Rd7 2. Kg2 Qd8 3. Rh1 Bd6 4. > Rc1 Nh7 5. Re1 Nf6 6. Kg1 Bxg3 7. fxg3 > Qc7 8. Qf2 Rcd8 9. Rec1 Nd5 > 17 207:41 ++ 1. Rxh5!! > 17 507:30 0.67 1. Rxh5 c5 2. Rg1 cxd4 3. Be5 f6 4. > Bxd4 Rxd4 5. Qxc8 Qxb3 6. Qe8 Rd1 7. > Rh6 Rxg1+ 8. Kxg1 Qb4 9. Rxg6+ Kh8 > 10. h5 Kh7 > 17-> 509:15 0.67 1. Rxh5 c5 2. Rg1 cxd4 3. Be5 f6 4. > Bxd4 Rxd4 5. Qxc8 Qxb3 6. Qe8 Rd1 7. > Rh6 Rxg1+ 8. Kxg1 Qb4 9. Rxg6+ Kh8 > 10. h5 Kh7 > 18 611:06 0.79 1. Rxh5 c5 2. Rg1 cxd4 3. Be5 f6 4. > Bxd4 Rxd4 5. Qxc8 Qxb3 6. Qe8 Rd1 7. > Rh6 Rxg1+ 8. Kxg1 Qd1+ 9. Kg2 Qd6 10. > Rxg6+ Kh8 11. h5 Kh7 > 18-> 622:38 0.79 1. Rxh5 c5 2. Rg1 cxd4 3. Be5 f6 4. > Bxd4 Rxd4 5. Qxc8 Qxb3 6. Qe8 Rd1 7. > Rh6 Rxg1+ 8. Kxg1 Qd1+ 9. Kg2 Qd6 10. > Rxg6+ Kh8 11. h5 Kh7 > 19 826:19 0.67 1. Rxh5 c5 2. Rg1 cxd4 3. Be5 f6 4. > Bxd4 Rxd4 5. Qxc8 Qxb3 6. Qe8 Rd1 7. > Rh6 Rxg1+ 8. Kxg1 Qb4 9. Rxg6+ Kh8 > 10. Rg4 Qc5 11. Qf7 f5 > 19-> 849:42 0.67 1. Rxh5 c5 2. Rg1 cxd4 3. Be5 f6 4. > Bxd4 Rxd4 5. Qxc8 Qxb3 6. Qe8 Rd1 7. > Rh6 Rxg1+ 8. Kxg1 Qb4 9. Rxg6+ Kh8 > 10. Rg4 Qc5 11. Qf7 f5 > >So Crafty likes 1...c5 too. >Kind regards >Bernhard I am wondering what changes you have done with the extentions of crafty. I assume it is to lighten the problem that crafty often completely gets lost in extentions and never seem to finish certain plys. At least this happens a lot when I analyze for a long time with crafty. If you have some settings that help this I would very much like to try them. Best regards Andreas Stabel
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