Author: Vincent Diepeveen
Date: 17:40:13 02/18/99
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On February 18, 1999 at 16:43:51, Robert Hyatt wrote: >On February 18, 1999 at 16:30:01, Will Singleton wrote: > >> >>Here are the results: >> >> <=5 6 7 8 >=9 >> >>Fritz 5.32 dxe5 dxe5 dxe5 dxe5 dxe5 >>Hiarcs 6 Nh4 Nh4 Be3 Be3 Be3 >>MacChess 4 dxe5 dxe5 dxe5 dxe5 Bc1 >>Crafty 16.5 dxe5 Bc1 Bc1 Bc1 Bc1 >>Amateur 0.91 dxe5 dxe5 dxe5 dxe5 Bc1 >>PostModernist 0.9 Nh4 dxe5 dxe5 Bc1 Bc1 >>EXchess 2.5x Bc1 Bd2 Bc1 Be3 Be3 >>LambChop 7.x Bc1 dxe5 Bc1 Bc1 Bc1 >>Gromit 1.2? --- --- --- dxe5 Nh4 >>Robertson 0.0 Bc1 Bc1 dxe5 dxe5 dxe5 >>Ferret Bc1 or dxe5, whatever >>InmiChess --- --- Nh4 Nh4 Nh4 >>Diep classified (private email :), but it wasn't dxe5) It is not classified :) >> >>Thanks for all your responses, we have some interesting results. >>A couple of issues here -- the first is that the position >>occurred in a blitz game, so only about 10 seconds was available >>to move. As it turns out, the position is already bad, -1 or >>so (as Bruce says, White is hosed), so there's no real good move >>-- but short term, there is a wide variety of opinion between >>the various programs. This has significance for blitz play, >>especially considering that dxe5 is probably the best move! >> >>I thought it might be interesting to analyze the reasons for the >>diversity of move selection. Some programs see deeper for a >>given ply depth, of course. Do they pay a price for this by >>having to take longer to iterate to a given ply? Or does the >>deeper search (more extensions) result in better ordering, which >>causes the desired ply to be reached even sooner? >> >>The position is fairly complex, and I would expect lots of >>extension triggers. For example, Hiarcs is known (I think) to >>extend quite a bit. I ran this with Hiarcs 6, and it never >>considers dxe5 (as the best move) through many minutes of >>searching. But after dxe5 a4 Qxa4 fxe5 Qxc4 etc, it has a >>better eval for white than it did with any alternative to dxe5 >>originally. So it looks like it missed what it later considers >>to be the best move, which is dxe5! >> >>Bc1 is worse (or no better) because of a4 Qb4 Re6 Nh4 Rb6 ... >>Be3 is worse (or no better) because of exd4 cxd4 Re6 Re3 Rb6 ... >> >>Maybe Bob has a bug. :) In both outputs I received, Crafty >>doesn't see the proper continuation after dxe5. And I believe >>Dann said that it may have switched back after a long think. >> > >I don't think I have a 'bug' but we may have differences... IE Dan wasn't >using the current 16.6 code, which is significantly different in the eval >area. On the above test (the data I sent came from my notebook) it liked >Bc1 until the last ply I gave you when it changed to Be3 and stuck there. > >I am not sure de loses... you may be lost already... > > > > >>Interestingly, Jim Walker says that Fritz 5.32 prefers dxe5 >>throughout a long search. I would like to see the pv output on >>that. Why does Fritz remain constant on what is probably the >>best move, while others are all over the lot? >> >>Will
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