Author: Uri Blass
Date: 22:23:59 08/03/04
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On August 04, 2004 at 00:33:37, Dan Honeycutt wrote: >On August 04, 2004 at 00:09:10, Uri Blass wrote: > >>On August 03, 2004 at 22:07:58, Dann Corbit wrote: >> >>>In a thesis paper on hardware move generation, the author found better success >>>with MVV/MVA than MVV/LVA for normal search (as opposed to quiescent). >>>http://www.macs.ece.mcgill.ca/~mboul/ICGApaper.pdf has this: >>> >>>"The arbiters are also capable of dynamically reversing priorities, thereby >>>permitting two different move ordering schemes: most-valuable-victim / >>>least-valuable-aggressor (MVV/LVA) and most-valuable-victim / >>>most-valuableaggressor >>>(MVV/MVA). This is labeled MVV/XVA. It was observed that MVV/MVA is the better >>>of the two move ordering methods during full-width tree searching (13% fewer >>>nodes, 10 opening-game test positions used). However, in quiescence search, >>>MVV/LVA is the preferred ordering (9% fewer nodes, same test positions). It >>>seems logical that during capture search, it is better to capture with the >>>least-valued pieces first. In full-width searching, the stronger pieces >>>typically cause the most damage and/or board control, explaining the somewhat >>>unorthodox MVV/MVA move ordering." >> >> >>Are you sure that capturing with the king cause the most demage in full-width >>search? >> >>I think that it may be better to capture with another piece because capturing >>with the king can cause king safety problems. >> >>Uri > >If the MVV is attacked by the king I don't see hou you could go wrong - no >recapture to worry about. > >Dan H. No recapture to worry about but king attacks to worry about. [D]rnbqkb1r/pp1Bpppp/5n2/2p5/4P3/8/PPPP1PPP/RNBQK1NR b KQkq - 0 3 I prefer to capture first with smaller piece and not with the king After Kxd7 checks like Qg4+ may be extended when after another move the king is safe from stupid checks that can cause extensions so the tree is smaller. Uri
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