Author: Slater Wold
Date: 11:40:05 10/06/03
Go up one level in this thread
On October 06, 2003 at 14:19:44, Robert Hyatt wrote: >On October 06, 2003 at 13:59:30, Slater Wold wrote: > >>On October 06, 2003 at 13:56:33, Dann Corbit wrote: >> >>>On October 06, 2003 at 13:51:29, Slater Wold wrote: >>> >>>>[D]8/6NK/8/1Bk5/P5q1/8/8/8 w - - 0 107 >>>> >>>>A lot of engines, after a lot of time can see this is lost. >>>> >>>>Crafty cannot. >>>> >>>>Any ideas on how to fix this? Other than waiting for Eugene to make the TB? :) >>> >>>Are you sure that it is lost? >>> >>>What is the sequence of moves that wins for black? >> >>Positive. Here's one engine's "proof": >> > > >I go to the end of your line and get nothing but draw scores. > > 14-> 1.04 -0.01 5. Bd7 Qg5+ 6. Kf8 Qd5 7. Ke7 Qxd7+ > <EGTB> (s=2) > 15 1.79 -0.01 5. Bd7 Qg5+ 6. Kf8 Qd5 7. Ke7 Qxd7+ > <EGTB> > 15-> 2.88 -0.01 5. Bd7 Qg5+ 6. Kf8 Qd5 7. Ke7 Qxd7+ > <EGTB> (s=2) > 16 14.55 -0.01 5. Bd7 Qg5+ 6. Kf8 Qd5 7. Ke7 Qxd7+ > <EGTB> > 16-> 18.23 -0.01 5. Bd7 Qg5+ 6. Kf8 Qd5 7. Ke7 Qxd7+ > <EGTB> > 17 1:54 -0.01 5. Bd7 Qg5+ 6. Kf8 Kc3 7. Bb5 Qc5+ > 8. Kg8 Kb4 9. Kh8 Qxb5 <EGTB> > 17-> 2:11 -0.01 5. Bd7 Qg5+ 6. Kf8 Kc3 7. Bb5 Qc5+ > 8. Kg8 Kb4 9. Kh8 Qxb5 <EGTB> > >Note that your piece names are hard for us SAN folks to read. IE I know >a Queen is a "D", but I thought a knight was a "S" and a bishop was a >"L"?? > >Crafty reports draw scores all the way through starting at the initial >position. I therefore have no idea what is wrong unless it is a simple >matter of not extending in the right place to see some subtle threat. I have a way, at home, for Crafty to finally see it, but it takes *forever*. CM9k takes almost 45 minutes to see that white is going to lose the pawn (and therefore lose), but I've given Crafty 10+ hours, and all it ever returns is -0.01.
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