Author: blass uri
Date: 09:44:01 08/02/99
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On August 02, 1999 at 11:43:05, Mark Higgins wrote: >On August 01, 1999 at 03:01:38, Ed Schröder wrote: > >>>Posted by Peter McKenzie on July 31, 1999 at 18:06:30: >>> >>>>Here is the position: >>>> >>>>5r1k/6p/1n2Q2p/4p//7P/PP4PK/R1B1q/ w >>> >>>Thanks for posting this position Bob. By the way, here is the position in a >>>more standard format (well, a format that my program can input anyway): >>> >>>5r1k/6p1/1n2Q2p/4p3/8/7P/PP4PK/R1B1q3 w - - >>> >>>LambChop would also suggest that Qxb6 is 'forced' (by Ed's suggestion) >>>after a 1 ply search. Of course, in such positions you should still spend some time >>>searching because they are not certanties by any means. >>> >>>In this particular position, most programs wouldn't be 'burnt' because they >>>would see that Qxb6 is bad after just a few seconds. LambChop (which uses >>>nullmove) discards Qxb6 at depth 7. I believe Crafty has a problem here >>>because it doesn't do any checks in the q-srch. >>> >>>Personally, I'm still uncomfortable with Ed's idea because I'm sure there are >>>many deeper sacrifices that would cause problems. But the trade off might be >>>worth it, who knows? >> >>To detect forced move using no A/B in the first (and second) iteration can >>be used as a base. From there it is not so difficult to find solutions (rules) >>for the trouble makers (exceptions). > >IMHO low-brain fast-searches like DB vs Kasparov have proved it is better to >forget about trouble makers and exceptions and just go for the brute force >approach. Fast and dumb rules. Forget about exceptions they are waste of time. >You spend all clock cycles and programmer time on worrying about exceptions and >then you are full of bugs. Nothing was proved. 1)DB was not close to be a perfect program. 2)You are full of bugs only before you spend programmer's time worrying about exceptions and not after it. Uri
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