Author: Robert Hyatt
Date: 12:02:36 09/11/01
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On September 11, 2001 at 11:40:22, Rafael Andrist wrote: >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 How do you get +2 at ply=1 when you don't see the pawn being won? Is this just a big positional score for always staying on a "coordinated square" with the black king?
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