Author: Marc Bourzutschky
Date: 20:37:52 10/08/02
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On October 08, 2002 at 19:38:02, John Merlino wrote: >On October 08, 2002 at 18:45:36, Marc Bourzutschky wrote: > >>The Chessmaster FEG program (downloadable from www.chessmaster.com) is a very >>clever tool that allows the generation of 6-man EGDB's with pawns on a 32 bit >>machine with limited resource requirements. This would not be possible with >>the Nalimov program without some code changes. I have generated KRPPKR which >>occurs relatively frequently in practice (next I'll generate KRPKRP and KRKPPP.) > >Many thanks for posting this information. I have a few questions: > >Which 6-man files have you built? How long did it take to build them? Have you >also built all of their dependent filesets? > >jm Below is a list of the endings I have generated so far, along with some statistics. The number of seconds is somewhat misleading because I used 3 different computers: a 1.9GHZ and 2.4GHZ P4, and an an old 800MHZ P3. For example, the KQRKQR ending was generated on the old machine which is why it took so long. I started this whole project September 12. As far as dependencies are concerned, FEG automatically stops when dependent files are missing, so you can only generate endgames with pawns if all possible promotions have been created. The main difference to the Nalimov scheme is that each EGDB only contains WTM to win or not to win, not distinguishing between a draw or a loss. So to get comparable info one needs to generate both KXKY and KYKZ. For KRPPKR I have not yet generated KRKRPP because I was mainly interested whether White can win or not, ignoring pathological positions where White actually loses. I'll get KRKRPP later anyway as a byproduct of generating KRKPPP, which is in the works. Because KRKPPP can go either way, I'll also generate KPPPKR. Ending # Secs WTM Size WTM Ply BTM Size BTM Ply ------------------------------------------------------------ KQQRKR 248337 181541366 73 454405666 74 KQRBKR 81755 705485974 135 1060868934 136 KQRKQR 510320 1161463938 233 426465391 234 KQRKRB 266976 1044489055 141 1252885945 142 KQRKRN 265612 1025129450 133 1353459632 138 KQRKRR 424856 696088906 113 563970032 112 KQRNKR 110866 678962160 87 1023118760 88 KQRPKR 329993 2069855830 149 3746111779 150 KQRRKR 81998 246328793 81 683209859 82 KRBBKR 121787 815254179 139 795943021 140 KRBKQR 54376 60403494 129 7176017 128 KRBKRB 62467 558544458 129 68163464 128 KRBKRR 56590 46934987 133 6850121 132 KRBNKR 131406 1621032003 135 1249681979 136 KRBPKR 311575 4691404903 151 4585986662 152 KRKQBB 19942 6021257 61 5967701 6 KRKQBN 23232 7374862 79 6402464 60 KRKQBP 67545 49797631 77 20721167 68 KRKQNN 24266 8042923 81 5996962 68 KRKQNP 104173 123187152 133 21034570 126 KRKQPP 80602 387265124 83 20308922 78 KRKQQB 17771 5799312 51 5845019 6 KRKQQN 21387 5884460 77 5856010 6 KRKQQP 54465 20018808 55 18789740 6 KRKQQQ 9890 5648101 7 5628973 6 KRKQQR 9686 5760118 7 5794036 6 KRKQRB 18535 6157489 53 6334517 6 KRKQRN 22505 6409825 79 6305985 6 KRKQRP 52386 26195616 57 20419355 48 KRKQRR 9968 5839264 7 5884821 6 KRNKQR 31582 40756874 73 6891222 70 KRNKRB 181544 532653480 73 47539498 72 KRNKRN 182437 633633087 103 59911833 102 KRNKRR 53265 31247335 73 6607222 70 KRNPKR 322138 4959158626 169 4558331725 170 KRPKQR 257582 660773785 235 33211534 224 KRPKRR 220795 734378250 149 72391611 148 KRPPKR 258491 1806511454 189 2200757722 190 KRRBKR 82773 629065508 137 559091788 138 KRRKQR 49265 277825100 65 35754296 64 KRRKRB 83225 614558904 133 150419097 132 KRRKRN 138858 753078894 177 315051543 178 KRRKRR 61544 258742167 79 45661712 78 KRRNKR 74479 613173287 89 517953298 90 KRRPKR 250624 1739999970 149 2354960874 150 KRRRKR 83699 139427358 65 264648675 66
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