Author: guy haworth
Date: 12:35:05 09/15/99
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Thanks for your contribution to the discussion. You are right that KQQKQQ is not the first EG-database that might be relevant to GK-v-WT ... but as it doesn't have Ps, is symmetric and has two pieces the same on each side, it's a good first run out for any 5-man code on a 6-man problem. You are also right that the WT (Black) will probably make its 'last stand' when White gets its pawn to g7. And any KQP(g)KQP database has to tackle g7 before g6. So KQP(g)KQP(b7-2/d6-2) would be good. I'm assuming here that the Black 'b', 'd' and 'g' pawns will not divert off the file because: a) any Q exchange will drop the position to 5-man and both sides will presumably have evaluated that 5-man position b) neither side is going to sacrifice its Q to a P However, modifying existing code isn't so easy; this would require removing the 'capture sideways' rule from the program. I tried to find a way of using the KQPKQ-db in the KQPKQPP context - to create an algorithm which discovered when the bPs were irrelevant to the result. This was basically about finding: a) forced wins for White that work regardless of the Pawns b) draws that work regardless of the Pawns I don't think I bottomed out a proper algorithm but it's a 'teaser' you might like to think about. You should also considering using possibly inaccurate heuristics which Wirth/Nievergelt mention in their ICCA J v22.2 paper. If White has 2Qs, Black has won and there is no capture, mate, stalemate or promotion for 3 ply, then one might assume White wins. Not strictly true but 'almost true'.
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