Author: Uri Blass
Date: 07:39:17 11/03/05
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On November 03, 2005 at 09:21:17, Uri Blass wrote: >On November 03, 2005 at 08:40:02, Ignacio Santos Crespo wrote: > >>Hi Uri, >> >>Thank you for your answer. The following position is interesting: Fruit crash >>and Movei crash after depth 16. >> >>Mate in 69 >> >>[D]1K1n2q1/1p4pR/1prPPpPn/1RB1p1rP/8/1B2p3/2p2b2/1k2N3 w - - 0 1 >> >>Regards, >>Ignacio. > > >Thanks for posting it. > >I could verify that the public version crash in console mode at depth 16 >when latest private version even crash at depth 14. > >The question is also what is the reason that fruit crashed. >If it crashed because the interface cannot get long pv then it may be a bug in >the interface but if it crashed because of another reason then it is a bug in >the engine. > >Uri More details The version that was compiled by Dan Crobit crash at depth 14 slower version that was compiled by me does not crash and can get even depth 17(maybe the reason is that I added some printf that print the maximal ply every time that it get it and for some reason the bug with printf does not lead to crash but only to high depth that is not logical(I get branching factor that is close to 1.2 or 1.3 at depth 14-17) the maximal selective depth of movei is 100 so it cannot see mate in 69 At depth 13 the maximal selective depth that movei search in this position is 97 At depth 14 it get selective depth of 100 and it seems that the version that Dan Corbit compiled crash near the time that it gets selective depth of 100 plies. I suspect that the problem may be that my arrays are too short at some point I tried to reduce the maximal search depth to 99 and it did not help. I tried again to reduce the maximal search depth to 97 and it did not crash but it also does not get depth 17 fast like the previous version and at the time of posting it only started depth 16 that is clearly logical because I do not expect branching factor of 1.2 and branching factor that is slightly more than 2 is clearly more logical. Uri
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