Author: Robert Hyatt
Date: 11:03:43 07/19/04
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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).
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