Author: Peter Berger
Date: 11:13:39 07/19/04
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On July 19, 2004 at 14:03:43, Robert Hyatt wrote: >On July 19, 2004 at 11:55:43, Daniel Clausen wrote: > >>Hi >> >>I'm testing the position below with various engines available for Linux and >>noticed that Crafty 19.15 prints funny things when failing high. >> >>[D]3qk3/8/8/8/8/8/PPPPPPPP/RNBQKBNR w - - 0 1 >> >>[snip] >> >> 9-> 3.58 33.23 1. e3 Ke7 2. Qg4 Qa5 3. Nf3 Qa8 4. >> Qg7+ Kd6 5. Qd4+ Ke7 6. Ne5 >> 10 4.43 +1 1. e3!! >> 10 5.04 +3 1. e3!! >> 10 8.10 +M 1. e3!! >> 10 35.02 37.08 1. e3 Ke7 2. Qh5 Kd6 3. Qb5 Qh8 4. >> Qb4+ Kd5 5. Qc4+ Kd6 6. Qd4+ Qxd4 7. >> exd4 Kd5 >> >>[snip] >> >>I noticed the "+1" things in previous games but never saw a "+3" or "+M" so far. >>I guess the "+3" (simliarly to "+1") means that Crafty got a fail high and knows >>that that the move is at least +3 better since that was the window of the >>re-search. But what is M? If it's a certain number, why don't print that? >> >>Sargon > > >+1 means a fail high outside the normal aspiration search window of about .4 >pawns. The +1 means we are upping the upper bound to current + 1.00. The +3 >means we added another +2 which means we are winning at least a pawn, and maybe >more. +M means we are upping the bound to +Mate, meaning that we are winning >more than a piece (more than +3.0). Should have put this question into the other post. Have these values been tested thoroughly? From watching testgames I regularly saw the +1 in PVs, but so far I have never seen the +3 without being followed by a +M some time later - so does this trick really save time over all?
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