Author: Ed Schröder
Date: 15:37:52 07/23/02
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On July 23, 2002 at 18:29:34, Steve Maughan wrote: >Many thanks to Ed for Rebel XP - you're too generous! > >I've been playing with the new package and it's fun. I especially like the >statistics that are shown as the engine searches. However I was surprised by >the following position: > >[d]r4qrk/ppp1b1pp/3p1p2/4pPPQ/4P2P/3PB3/PPP5/1K4RR w - - > >Key move Qxh7+ mate in 4. > >This is an old position from your tactics database and one that I actually sent >to Ed way back in the days of ChessMachine, which couldn't solve the position in >15 mins whereas THe King could solve it almost instantly. Ed's obviously put it >in with other problems and the last time I tested it on one of Ed's engines it >was solved instantly. To my amazement when I sparked up Rebel XP and set it to >the combinations setting IT COULDN't SOLVE THE POSITION in 15 mins on my 1.5 GHz >P4. Strange! - heavy pruning I guess - or is it a search bug. Interestingly >without the Combinations option it is solved within 5 secs. > >Regards, > >Steve Yep, this position has been bugging me since 1994 :) The "combination" setting still uses the old search approach, too bad I have forgotten to change that. For this version I only have focussed on the standard (default) engine which does well in this position. However withn a small parameter change in the "combination" settings it can be fixed. If you are interested I can make the right personality for you. Ed
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