Author: Mike Byrne
Date: 07:24:52 03/27/05
Go up one level in this thread
On March 27, 2005 at 06:56:35, Vincent Lejeune wrote: >On March 26, 2005 at 21:30:04, Robert Hyatt wrote: > >>On March 26, 2005 at 19:46:58, Vincent Lejeune wrote: >> >>>On March 26, 2005 at 15:34:45, Dieter Buerssner wrote: >>> >>>>On March 26, 2005 at 15:29:42, Dieter Buerssner wrote: >>>> >>>>>On March 26, 2005 at 15:20:17, Mike Byrne wrote: >>>>> >>>>>>after the main line : Kf2 f5 h3 Kc7 g3 hxg3 is winning no? >>>>>> >>>>>>Black(2): his >>>>>> white black >>>>>> 1 Kf2 f5 >>>>>> 2 h3 Kc7 >>>>>> 3 g3 ... >>>>>> 17 25.52 -7.17 3. ... hxg3+ 4. Kxg3 f4+ 5. Kg4 b6 >>>>>> 6. h4 f3 7. Kxf3 gxh4 8. c6 Kxc6 9. >>>>>> Kg4 b5 10. a5 b4 11. Kxh4 Kb5 12. Kg4 >>>>>> >>>>> >>>>>In this line, Yace says 8. c6? is losing, while 8.cxb6 is draw. >>>> >>>>It is such an obvious blunder, that it looks like a bug in Crafty. >>>> >>>>Regards, >>>>Dieter >>> >>> >>>Probably a bug in the static eval of the pawn endgame. after 3 min@3 Ghz : >> >>I can't reproduce Mikes PV with this "c6 bug"... I don't get c6 at any point >>that I can see, it always takes... >> >>Any ideas? > > >I succeded to replicate c6 as best move : >1) without any EGTB >2) starting with this position 8/1p1k4/5p2/2Pp2p1/P2P3p/8/6PP/6K1 w - - 0 1 >3) under chessbase interface >4) played 1. Kf2 f5 2. h3 Kc7 3. g3 hxg3+ 4. Kxg3 with 5 between each move >5) the score is rising for white but it so long I stopped >Is it a problem related to only pawns endgame eval or linked to hashtables too ? > I suggest not to test under Chessbase GUI unless you are using the native chessbase crafty engine. Chessbasee requires an UCI engine, Crafty is not a UCI engine. If the "bug" is only in the Chessbase interface and not in the console window, I beleives that may suggest that there in bug Chessbase GUI implementation. Adding an adapater in between to make Crafty works adds another level of debugging complexitiy. In my case, I have isolated the issue to the kppkp EGTB that I generated. They were generated using the vector option, I am now generating them without the vector option to see what happens. One obvious difference is that the vector and non-vector generated kppkp files have different file sizes which may be indicator of a bug in my compiled version of tbgen. Best, Michael
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