Author: Aivaras Juzvikas
Date: 07:55:38 04/04/04
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On April 04, 2004 at 10:48:55, Vasik Rajlich wrote: >On April 03, 2004 at 06:29:13, Aivaras Juzvikas wrote: > >>On April 03, 2004 at 06:21:51, Vasik Rajlich wrote: >> >>>On April 03, 2004 at 04:02:57, Aivaras Juzvikas wrote: >>> >>>>i have got this problem here, check extention explodes in the endgame pawns + >>>>rook or queen, all these open files make it possible to check endlessly. how to >>>>restrict this? i added smth like this: if ply > depthtoreach + 4 then dont >>>>extend, where depthtoreach is the depth im searching to. but this is ofcourse >>>>not very good, because i still get those check extentions where its impossible >>>>to mate anyway. how did u solve this problem? an idea would be to store info >>>>into transposition table when not to extend, but how to find that out? >>> >>>Are you extending checks, check evasions, or both? >>> >>>The third option is quite appealing, but there are some issues. :-) >>> >>>Cheers, >>>Vas >> >>when side to move in in check i extend, so i guess it would be a check evasion > >So, in certain positions, you are extending every other move. It's true that in >these positions this will severely hurt your nominal depth, but if you test with >the extension and without it you should see a clear benefit. I don't remember >any claims to the contrary. > >Vas well here is a claim to the contrary: in endgame rook+pawns vs rook+pawns instead of dealing with passed pawns the engine keeps on extending checks endlessly thus overall looking very few ply ahead and the result is a loss of a rook due to pawn promotion. usually (w/o endless check extention stuff) i reach 15-17 ply depth in endgame, with check ext. stuff i get 7-8ply, and again only when slider like rook or queen is present which can keep on checking no matter what you do. dont u restrict your extentions somehow? please share with me how to do this
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