Author: Joachim Rang
Date: 07:49:01 11/03/05
Go up one level in this thread
On November 03, 2005 at 10:39:17, Uri Blass wrote: >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 it has to do with the compiler. Fruit compiled by Bryan Hofmann (official version ) crashes while other dev-compile from me does not. Probably some kind of optimization which can cause a crash in rare circumstances. Joachim
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