Author: Anthony Cozzie
Date: 08:49:16 06/30/04
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On June 30, 2004 at 11:30:19, Stuart Cracraft wrote: >Hi -- I threw together a quick chess program in the past 3 >weeks to do some research and recently added a testsuite >capability to at least get some measure of QA for changes. > >I then ran testsuite on the program at about 12-13 seconds >per move against Win-at-Chess (300 positions) on a slow >(for these days) PC (1ghz P3 w/ 512mb). > >To my surprise, Verified Null Move with R=3 scored better >without transposition table than with. Transposition table was >set to 0.5M entries in all cases. > >See below where #3 result is greater than all the others. >It's puzzling to me why transposition table should reduce >the result for #3 down to the level of #5. > >Has anyone else seen this with their program or programs >in general? It is most puzzling/counter-intuitive to me. > >1. ***** base/plain/no nullmove/no transposition/no optimizations ***** >*** Test score: 61% correct (183 out of 300) >*** Grand total nodes: 440075104 time: 3868.21 >*** Average nodes/time/nps per test position: 1466917 13 113767 > >2. ****** opt trans ******* >*** Test score: 67% correct (203 out of 300) >*** Grand total nodes: 620892160 time: 3635.11 >*** Average nodes/time/nps per test position: 2069640 12 170804 > >3. ****** opt verified null 3 ******* >*** Test score: 69% correct (207 out of 300) >*** Grand total nodes: 656987264 time: 3591.53 >*** Average nodes/time/nps per test position: 2189958 12 182927 > >4. ****** opt trans verified null 2 ******* >*** Test score: 64% correct (194 out of 300) >*** Grand total nodes: 663116096 time: 3521.66 >*** Average nodes/time/nps per test position: 2210387 12 188296 > >5. ****** opt trans verified null 3 ******* >*** Test score: 66% correct (200 out of 300) >*** Grand total nodes: 678707776 time: 3521.42 >*** Average nodes/time/nps per test position: 2262359 12 192737 > >(I also tested against non-verified null move and its result was >far worse than the above which made sense, but that transposition >effect sent me for a loop.) > >Any comments would be appreciated? > >Stuart You have transposition table bugs. anthony
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