Author: Robert Hyatt
Date: 10:19:38 07/11/03
Go up one level in this thread
On July 11, 2003 at 11:50:20, Grzegorz Sidorowicz wrote: >>Hi >> >>Probably a long shot, but my program used to be able to solve this position, but >>then after some mods I noticed it failed to find a1b1. >>In my case the explanation was that Null moving was accidentally being switched >>on when it should have realised that there were no major pieces left and >>switched Null moving off. >> >>Does you program do Null moving ? If it does, try switching it off and see if it >>makes a difference ? > >Without null moves my program also can't find solution A couple of points. First, you ought to get to depth=25 _instantly_. You can try this position on Crafty to get a feel for how you are doing. I'd immediately inspect the hash probe and hash store code _carefully_ as it appears to be broken. For comparison, Crafty gets to ply=35 in 7 seconds on my PIII/750 laptop. It finds Kb1 at around depth=18/19 depending on hash size. If you don't find it by depth=26 you have a horrible bug. And if you don't get to depth 26 instantly (my same laptop takes .5 seconds to get there) you also probably have a bad hashing bug. are you sure you are handling the bounds correctly when you store them and then look them up. Are you checking the draft right, using >= rather than > in the comparison? Etc. >Output below: >depth time nodes score variation >------------------------------------------- >1 0 2 130 a1a2 >2 0 18 130 a1a2 a7a6 >3 0 48 105 a1a2 a7b6 a2a1 >3 0 92 109 a1b2 a7b6 b2a1 >4 0 219 113 a1b2 a7b6 b2c3 b6a6 >5 0 428 113 a1b2 a7b6 b2c3 b6c7 c3b3 >6 0 889 114 a1b2 a7b6 b2c3 b6c7 c3c4 c7b7 >7 0 1874 114 a1b2 a7b6 b2c3 b6c7 c3c4 c7b6 c4b3 >8 0 5151 113 a1b2 a7b8 b2c3 b8b7 >9 0 11714 113 a1b2 a7b8 b2c3 b8b7 c3b3 b7c7 b3c4 >10 0 22903 113 a1b2 a7b8 b2c3 b8b7 c3b3 b7c7 b3c4 c7b6 c4d3 >b6c7 >11 0 48198 113 a1b2 a7b8 b2c3 b8b7 c3b3 b7c7 b3c4 c7b6 c4d3 >b6c7 d3c3 >12 0 100795 113 a1b2 a7b8 b2c3 b8b7 c3b3 b7c7 b3c4 c7b6 c4d3 >b6c7 d3c3 c7b7 >13 0 174559 113 a1b2 a7b8 b2c3 b8b7 c3b3 b7c7 b3c4 c7b6 c4d3 >b6c7 d3c3 c7b6 c3b3 >14 0 320963 113 a1b2 a7b8 b2c3 b8b7 c3b3 b7c7 b3a2 c7c8 a2a1 >c8b8 a1b2 b8c7 b2c3 c7b7 >15 1 603424 113 a1b2 a7b8 b2c3 b8b7 c3b3 b7c7 b3a2 c7c8 a2a1 >c8b8 a1b2 b8c7 b2c3 c7b6 c3b3 >16 3 1311780 113 a1b2 a7b8 b2c3 b8b7 c3b3 b7c7 b3a2 c7c8 a2a1 >c8b8 a1b2 b8b7 b2c3 b7c7 c3d3 c7b7 >17 6 2533249 113 a1b2 a7b8 b2c3 b8b7 c3b3 b7c7 b3a2 c7c8 a2a1 >c8b8 a1b2 b8b7 b2c3 b7a6 c3d3 a6b6 d3c2 >18 18 6864512 113 a1b2 a7b8 b2c3 b8b7 c3b3 b7c7 b3a2 c7c8 a2a1 >c8b8 a1b2 b8a8 b2c2 a8b7 c2b3 >19 37 13493689 113 a1b2 a7b8 b2c3 b8b7 c3b3 b7c7 b3a2 c7c8 a2a1 >c8b8 a1b2 b8a8 b2c2 a8b7 c2b3 >20 2.7 49017631 113 a1b2 a7a8 b2c2 a8b8 c2b1 b8a8 b1a2 a8a7 a2a1 >a7a6 a1b1 a6b6 b1a2 b6a6 a2a1 a6a7 >21 3.57 88641036 113 a1b2 a7a8 b2c2 a8b8 c2b1 b8a8 b1a2 a8a7 a2a1 >a7a6 a1b1 a6a7 b1c2 a7a8 c2d2 a8b8 d2c3
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