Author: Bas Hamstra
Date: 09:34:00 09/17/99
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On September 17, 1999 at 12:18:12, Owen Lyne wrote: >On September 17, 1999 at 12:07:57, Peter Fendrich wrote: > >>On September 16, 1999 at 22:52:42, Robert Hyatt wrote: >>>First, don't clear the killers, ever. Second, use them before generating any >>>moves, after making sure each is a valid move in the current position... >> >>Well, I don't clear the killer but the counter is set to 0 in the beginning of >>each new ply... > >Hmm - I'm wondering what Bob means by 'ever' here. For example, I know he likes >to keep the hash table through a game, some informationm remains useful, rest >gets overwritten, so no reason to waste time clearing it especially. But with >killers, does some thing work. I mean, you surely don't want Nxf7+ to remain in >the killers once both of your knight has been exchanged off? Or perhaps even if >there is no longer something on f7 to capture (or do killers exclude captures >and/or checks, are those looked after somewhere else? If so, some of my points >remian, and some don't ;) Or will a killer than no longer kills get removed >gradually in the same way old hash does, so there's no point specifically >clearing it? > >Owen I think what Bob means is that you don't ever erases a killer when it appears to be a nonlegal move in a position. In another position it maybe *is* legal. Of course it will very often be overwritten by another killermove. Therefore erasing killers is not necessary. If its not legal, just don't play it, but don't erase. Regards, Bas Hamstra.
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