Author: jonathan Baxter
Date: 16:59:22 06/23/98
Go up one level in this thread
On June 23, 1998 at 18:25:49, Amir Ban wrote: >On June 23, 1998 at 16:19:32, Bruce Moreland wrote: > >> >>On June 23, 1998 at 09:45:45, Moritz Berger wrote: >> >> >>>I took the example position on Eds page to test the 'anti GM' qualitities of >>>some other programs (P233MMX, NT 4.0, 128 MB RAM). Especially Junior's >>>performance is frightening (Rxe6 at 4.5 ply after 2", after 4" even with >>>positive evaluation!). >>> >>>No question that Anti-GM-Rebel is now among the very best programs in this >>>position, so Ed clearly is on the right track ... >> >>>2rqk2r/pb1nbp1p/4p1p1/1B1n4/Np1N4/7Q/PP3PPP/R1B1R1K1 w k - 0 1 >> >>>Junior 4.6 32768 KB hash tables >>>00:04 9 semiply 0.04 Rxe6! >>> >>>Fritz 5.01 98304 KB hash tables >>>00:04 7/28 -1.13 Rxe6! >> >>>Hiarcs 6 (Fritz engine) 98304 KB hash tables >>>01:42 7/23 -0.88 Rxe6! >> >>>Crafty v15.14, hash table memory = 48M bytes, pawn hash table memory = 10M >> >>> 9 3:49 ++ 1. Rxe6!! >> >>>Shredder 2.0 >> >>> 9.07 5:24.71 -0.15++ Rxe6 (17.259.985) >> >>Ferret: >> >>Never, I hope. >> >>I get a fail high a few minutes into this, but the re-search fails low. >> >>I like aggressive play, and I like speculative play that works, but I think that >>programs are seeing something here that doesn't exist. >> >>Crafty likes the position after Rxe6, it ends up with a positive score. Bob >>wasn't around so I could ask him, but I did some experiments and got permission >>retroactively. >> >>I set up the position after Rxe6 fxe6 and asked Crafty to play white (30 0, with >>Crafty on a 4 processor P6/200 and mine on a 533 mhz Alpha). It was happy for a >>couple of moves then the bottom fell out. It tried to throw more fuel on the >>fire and ended up a rook down with nothing to show for it. >> >>I reversed the colors and tried again, and mine started out at like -1.7 and >>stuck there into an ending where it as down the exchange for a pawn, and had >>worse development. >> >>I am hoping that the reason my program won't play this is that it sees that the >>bottom falls out. >> >>I would be happy to be shown a line that has any promise for white. If someone >>thinks that this really does win, or at least offers good counterplay, please >>post a line. >> > >The critical line is: > >1.Rxe6 fxe6 2.Nxe6 Qa5 3.Bxd7+ Kxd7! 4.Nc5+ Ke8 5.Qd7+ Kf7 6.Nxb7 Rc7 7.Nd6+ Kg7 >8.Ne8+ Rxe8 9.Qxe8 Nf6! > >The rook sac is not at all speculative. It's just wrong. Your eval should be a >significant plus for white at at least two points in it, but this doesn't hold >because black has these counter-resources. Black has only one defense, but it >works. The hard part for black is seeing 3...Kxd7. 3...Kf7 is a dead loss. > > >>My own analysis shows a nasty check or two, then black is simply up material. >> > >No, there's more to it as you can see in the line. I don't understand how your >program can dismiss this line without passing through intermediate depths where >it would think it works. > > >>Additionally, I would like to ask those who report when they find this move to >>see how long their programs hold the move. Do they stick with it for 24 hours? >> > >It takes me 7 minutes on P-II 300 to play 1... fxe6. KnightC, in 4 mins, plays 1. Rxe6 (-1.43) and stays with Rxe6 for at least 10 more minutes. The PV is e1e6 f7e6 d4e6 d8a5 b5d7 e8d7 e6c5 d7e8 h3d7 e8f7 c5b7 d5f6 Jon
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.