Author: Bas Hamstra
Date: 04:51:43 02/09/99
Can anyone help, please? I really could use some good advice about extensions. Since I added extensions to my program it solves more WAC positions and much faster. So I hoped my FICS rating would climb quit a bit. But alas, the opposite happened. I know, I know, suite solving times don't say anything about qualitity of play in real games. Yet you can't afford to miss too much basic tactics, and that's what I try to use WAC for. I think the reason why the rating is so low now (1920 FICS) is that the extensions take too much "horsepower". I think. Not that de search exactly chokes, but sometimes, for example with open kings on the board, the engine thinks a couple of plies less deep than normal. What is the optimal way to do extensions *right*? So it still quickly sees the "standard mates" but without too much costs? I am thinking of doing the following: 1. Don't limit one-reply-to-check at all. Just add +2 to Depth. 2. For check, mating, promotion, capture-near-king: set a limit based on the normal (unextended) depth of the tree under this node. For instance ExtLimit = Depth/4 allows one extensios every 4 plies. 3. Recapture extensions: Don know?! Probably same as in 2? Would this work? And is it optimal? If not, what is? Thanks in advance, Bas Hamstra. PS: Currently I skip nullmove in a node where any extension is added. The idea is that if there is an extension, there is danger (well, uncertaincy) so it doesn't seem right to do null then. Reactions?
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