Author: Rafael Andrist
Date: 08:40:22 09/11/01
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On September 11, 2001 at 10:36:00, Robert Hyatt wrote: >On September 10, 2001 at 13:37:58, Rafael Andrist wrote: > >>On September 07, 2001 at 13:41:57, Robert Hyatt wrote: >> >>>I did this in Cray Blitz _many_ years ago (coordinated squares is the term I >>>hear used most often). And I was amazed that it took longer to find the right >>>move. After a mountain of debugging output, I discovered what I mentioned >>>previously... "hash grafting" (the art of grafting parts of the tree from >>>one zone to another by using the hash table) was helping the dumber version, >>>but not the smarter one. >>> >> >>You mix some things together! Knowledge about opposition is only one of the >>tools you need to to construct a system of co-ordinated squares (german: >>Gegenfeldsystem). If you implement this correctly, you should find the correct >>move instantly i.e at ply 1 as my chess program Wilhelm does. >> >>Rafael B. Andrist > > >You find the right move instantly... But you don't _know_ it is the right move >until the score jumps. It _could_ just be a draw. And in the case of Cray >Blitz, using coordinated squares, it took 25-26 plies to see the big score. >It saw the right move normally at around ply=18 with the +2.5 score. With >the coordinated squares stuff, it got the Kb1 move instantly, but the score >didn't reach +2.5 until 7-8 plies longer than the simple version. > >That was the point. The better the move ordering, the less "grafting" helps >a shallow search find a deep solution. I now by eval from ply 1 that i win a pawn. In Fine 70, White is already a pawn up, so I get instantly an evaluation around 2. Rafael B. Andrist
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