Author: Robert Hyatt
Date: 07:57:56 02/24/04
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On February 24, 2004 at 09:32:08, martin fierz wrote: >On February 23, 2004 at 23:05:58, Robert Hyatt wrote: > >>On February 23, 2004 at 18:52:36, Geoff Westwood wrote: >> >>>Hi >>> >>>I was perusing the latest table of results, Crafty's static eval of 2 of the >>>passed pawn positions were interesting. >>> >>>Assuming I havent made a mistake in the cutting and pasting >>> >>>Position 1 >>>8/4k3/8/7P/1P6/3p4/4p3/4K3 b - -; id "PP-00004" >>> >>>[D]8/4k3/8/7P/1P6/3p4/4p3/4K3 b - - >>> >>>Crafty reckons this is +4.8 (good for white). This is rather clever as although >>>the black king could catch either of the white passed pawns, it cannot stop >>>both. Also blacks 2 advanced pawns cant do anything as the white king gobbles >>>them up easily. Only Crafty and Tinker understand this position statically. Any >>>tips on what the algorithm is to sort this one out ? >> >> >>This is the idea I have reported here before, pointed out (demanded to be fixed >>in fact) by a GM friend of mine. The idea is that the two separated pawns are >>better than the two connected passers. The king stops the two connected passers >>easily until the enemy king supports them, meanwhile the split passers walk on >>in... > >i don't like the generality of your statemtent here, but - it is a small price >to pay if it's right in most cases. which perhaps is the case. anyway, here's my >question: > >what does your static eval say for the black king on e6/e5/e4/e3 ? i wouldn't be >surprised if it got it wrong in some cases now... > Once the king actually supports the pawns, things change, because suddenly time is not wasted in bringing the king up. But you are asking the _wrong_ question. It should be "do you prefer to get it wrong _all_ the time, or just a small percentage of the time?" This bit of code has been "tested in fire" and works well. A program that doesn't do it will get fried to a crisp by a GM that notices the problem. It happened to me until I fixed it. >cheers > martin
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