Author: martin fierz
Date: 12:31:31 09/02/04
Go up one level in this thread
On September 02, 2004 at 09:45:25, Michael Henderson wrote: >On September 02, 2004 at 02:39:28, martin fierz wrote: > >>On September 01, 2004 at 10:11:18, Uri Blass wrote: >> >>>On September 01, 2004 at 05:57:25, martin fierz wrote: >>> >>>>On September 01, 2004 at 00:51:47, Stuart Cracraft wrote: >>>> >>>>[snip] >>>> >>>>Muse on P4 2.4GHz finds the mate at ply 6, failing high on Qxf4 after 0.7 >>>>seconds (not shown in the logfile). >>>> >>>>the reason it can solve this at such a low search depth is probably twofold, the >>>>first is that it generates checks in qsearch on the first ply of the qsearch (so >>>>when you drop directly into qsearch with a nullmove, it will see Rh8# every >>>>time), the second is probably that it is using mate-threat extensions. >>>> >>>>cheers >>>> martin >>> >>>Do you get 2 plies only by mate extensions? >>>In order to do it you need to extend 2/3 ply for mate threat. >>> >>>The line 1.Qxf4 Bxf4 2.Rxh5 gxh5 3.Rxh5 Bh6 4.Rxh6 is 7 plies and qsearch here >>>does not see mate because it is black to move so I need 8 plies even if I >>>disable pruning by evaluation. >> >>hi uri >> >>the reason must be that after 2.Rxh5 i get a mate threat extension and after >>3.Rxh5 again, and since i do a full ply for that, my program sees it. >> >>cheers >> martin >> >>> >>>With pruning by evaluation latest movei get it only in 10 plies but I think to >>>change my pruning to make it see it faster. >>> >>>Uri > >is recapture extension also playing a role here?...if that applies. it doesn't apply for me, but it probably depends on what an engine would classify as a "recapture". some people might call any sequence of two captures on the same square a recapture, for me a recapture is only if a piece of the same value is recaptured. this isn't the case here. cheers martin
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