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Subject: JAFM's interesting pawn endgame test position:

Author: Dann Corbit

Date: 11:51:16 10/01/01


Yace takes 35 seconds to find the right move, and 38 seconds to know it is a
draw:

white ( 1): st 999
white ( 1): test ptest.ci
title "Draws."
Stored 0 learned positions into hash table
solution  h3
usetime = 998.00, mintime = 998.00 maxtime = 998.00 tl 998.00 ml 0
         2   0.007  -0.33  1t  1.Kxa7 Kxb5 {0}
         7   0.013  -0.06  1t  1.g4 {0}
        12   0.020  -0.06  1.  1.g4 {0}
        27   0.027  -0.03  2t  1.g4 Kc5 {0}
        47   0.033  -0.03  2.  1.g4 Kc5 {0}
        73   0.040   0.01  3t  1.g4 Kc5 2.h3 {0}
       146   0.046   0.01  3.  1.g4 Kc5 2.h3 {0}
       247   0.053  -0.01  4t  1.g4 Kc5 2.h3 Kc4 {0}
       465   0.060  -0.01  4.  1.g4 Kc5 2.h3 Kc4 {0}
       683   0.067  -0.05  5t  1.g4 Kc5 2.h3 Kc4 3.Ka5 {0}
      4150   0.078  -0.05  5.  1.g4 Kc5 2.h3 Kc4 3.Ka5 {0}
      8781   0.086  -0.10  6t  1.g4 Kb4 2.b6 axb6 3.Kxb6 Kc4H 4.Kc6H Kd4H
                               5.Kd6H Ke4H {0}
     15882   0.104  -0.10  6.  1.g4 Kb4 2.b6 axb6 3.Kxb6 Kc4 4.Kc6 Kd4 5.Kd6
                               Ke4 {0}
     23045   0.123  -0.05  7t  1.g4 Kb4 2.b6 axb6 3.Kxb6 Kc4 4.Kc6 Kd4 5.Kd6
                               Ke4 6.h3 {0}
     37659   0.152  -0.05  7.  1.g4 Kb4 2.b6 axb6 3.Kxb6 Kc4 4.Kc6 Kd4 5.Kd6
                               Ke4 6.h3 {0}
     51533   0.179   0.00  8t  1.g4 Kb4 2.h3 Kc4 3.Ka5 Kd4 4.Ka6 Kc4H 5.Ka5H
                               Kd4H 6.Ka6H Kc4HR {0}
     76072   0.226   0.00  8.  1.g4 Kb4 2.h3 Kc4 3.Ka5 Kd4 4.Ka6 Kc4 5.Ka5 Kd4
                               6.Ka6 Kc4 {0}
    102565   0.271  -0.03  9t  1.g4 Kc5 2.Ka5 Kd4 3.Ka6 Kc4 4.h3 Kb4H 5.b6H
                               axb6H 6.Kxb6H Kc4H 7.Kc6H Kd4H 8.Kd6H Ke4H
                               9.Ke6H {0}
    145247   0.344  -0.03  9.  1.g4 Kc5 2.Ka5 Kd4 3.Ka6 Kc4 4.h3 Kb4 5.b6 axb6
                               6.Kxb6 Kc4 7.Kc6 Kd4 8.Kd6 Ke4 9.Ke6 {0}
    176316   0.395   0.00 10t  1.g4 Kc5 2.Ka5 Kd4 3.Ka6 Kc4 4.Ka5 Kd3 5.Ka6
                               Kc4H 6.Ka5H Kd3H 7.Ka6H Kc4HR {0}
    239484   0.491   0.00 10.  1.g4 Kc5 2.Ka5 Kd4 3.Ka6 Kc4 4.Ka5 Kd3 5.Ka6
                               Kc4 6.Ka5 Kd3 7.Ka6 Kc4 {0}
    297235   0.577  -0.03 11t  1.g4 Kb4 2.h3 Kc4 3.Ka5 Kc5 4.Ka6 Kb4H 5.b6H
                               axb6H 6.Kxb6H {0}
    409874   0.741  -0.03 11.  1.g4 Kb4 2.h3 Kc4 3.Ka5 Kc5 4.Ka6 Kb4 5.b6 axb6
                               6.Kxb6 {0}
    460044   0.816  -0.03 12t  1.g4 Kb4 2.h3 Kc4 3.Ka5 Kb3 4.Ka6 Kb4 5.b6
                               axb6H 6.Kxb6H Kc4H 7.Kc6H Kd4H 8.Kd6H Ke4H
                               9.Ke6H Kd4H 10.Kd6H Ke4H 11.Ke6H Kd4H 12.Kd6HR
                               {0}
    621806   1.063  -0.03 12.  1.g4 Kb4 2.h3 Kc4 3.Ka5 Kb3 4.Ka6 Kb4 5.b6 axb6
                               6.Kxb6 Kc4 7.Kc6 Kd4 8.Kd6 Ke4 9.Ke6 Kd4 10.Kd6
                               Ke4 11.Ke6 Kd4 12.Kd6 {0}
    704529   1.188  -0.04 13t  1.g4 Kb4 2.h3 Ka4 3.b6 axb6 4.Kxb6H Kb4H 5.Kb7H
                               Kc5H 6.Kc7H Kd5H 7.Kd7H Ke5H 8.Ke7H Kf4H 9.Kf6H
                               {0}
    962556   1.564  -0.04 13.  1.g4 Kb4 2.h3 Ka4 3.b6 axb6 4.Kxb6 Kb4 5.Kb7
                               Kc5 6.Kc7 Kd5 7.Kd7 Ke5 8.Ke7 Kf4 9.Kf6 {0}
   1080678   2.680  -0.34 14t  1.g4 Kb4 2.h3 Kc4 3.Ka5 Kb3 4.b6 axb6+ 5.Kxb6
                               Kc4 6.Ka5 Kd5 7.Kb4 Ke4H 8.Kb3H Kf4H 9.Kc2H
                               Ke4H {0}
   1556724   8.678  -0.33 14t+ 1.h3 Kc5 2.Kxa7 Kxb5 3.Kb7 Kc5 4.Kc7 h5 5.Kd7
                               Kd4 6.Ke7 Ke5 7.Kf7 g4 8.Kg6H Ke6H 9.hxg4H
                               hxg4H {0}
   2164443  12.811  -0.34 14t- 1.h3 h5 2.Kxa7 Kxb5 3.Kb7 Kc5 4.Ka6 Kc4 5.Ka5
                               Kd4 6.Ka4 g4 7.Kb3 Ke4 8.hxg4 hxg4 9.Kb2 Kf4
                               10.Kb3 g3 11.Kc4H Ke3H 12.Kc5H Kf2H 13.Kc4H
                               Kxg2H 14.Kd4H Kh2H 15.Ke4H g2H 16.Kd4H {-80}
   2164443  12.811  -0.34 14t  1.g4 Kb4 2.h3 Kc4 3.Ka5 Kb3 4.b6 axb6+ 5.Kxb6
                               Kc4 6.Ka5 Kd5 7.Kb4 Ke4 8.Kb3 Kf4 9.Kc2 Ke4 {0}
   2252303  13.514  -0.33 14t+ 1.g3 h5 2.Kxa7 Kxb5 3.Kb7 Kc5 4.Kc7 Kd5 5.Kd8
                               Ke4 6.Ke7 Ke5 7.Kf7 h4H 8.Kg6H Ke6H 9.gxh4H
                               gxh4H {0}
   2447445  14.784  -0.22 14t  1.g3 h5 2.Ka5 g4 3.Ka4 Kd5H 4.Ka5H Kd4H 5.Ka6H
                               Kc4H 6.Ka5H Kd4H 7.Ka6H Kc4H 8.Ka5H Kd4HR {0}
   2512037  15.013  -0.22 14.  1.g3 h5 2.Ka5 g4 3.Ka4 Kd5 4.Ka5 Kd4 5.Ka6 Kc4
                               6.Ka5 Kd4 7.Ka6 Kc4 8.Ka5 Kd4 {0}
   2792215  16.250  -0.36 15t  1.g3 h5 2.Kxa7 Kxb5 3.Kb7 Kc5 4.Kc7 Kd5 5.Kd7
                               Ke5 6.Ke8 Ke6 7.h3 g4 8.h4 Ke5 9.Kf7 Kf5
                               10.Kg7H Ke6H 11.Kg6H {0}
   2946182  17.829  -0.35 15t+ 1.Kxa7 Kxb5 2.Kb7 Kc5 3.Kc7 Kd4 4.Kd7 Ke4 5.Ke7
                               Kf4 6.g3+ Ke5 7.h3 Kd4H 8.h4H Kc3H 9.hxg5H
                               hxg5H 10.Kf6H g4H 11.Kg5H Kb2H 12.Kh4H Kc3H {0}
   2966696  18.023  -0.35 15t  1.Kxa7 Kxb5 2.Kb7 Kc4H 3.Kc7H Kd3H 4.h4H Ke4H
                               5.h5H g4H 6.Kd7H g3H 7.Kc6H Ke3H 8.Kb6H Kf4H
                               9.Ka6H Ke3H 10.Kb6H Kf4H 11.Ka6H Ke3H 12.Kb6HR
                               {0}
   3289700  19.986  -0.35 15.  1.Kxa7 Kxb5 2.Kb7 Kc4 3.Kc7 Kd3 4.h4 Ke4 5.h5
                               g4 6.Kd7 g3 7.Kc6 Ke3 8.Kb6 Kf4 9.Ka6 Ke3
                               10.Kb6 Kf4 11.Ka6 Ke3 12.Kb6 {0}
   3315096  20.106  -0.75 16-- 1.Kxa7 Kxb5 2.Kb7 Kc4 3.Kc7 Kd3 4.Kd7 Ke3 5.Ke8
                               g4 6.Kd8 h5 7.Ke7 h4 8.Kf8 h3 9.g3 Ke4 {0}
   3489130  24.003 -Mat23 16t  1.Kxa7 Kxb5 2.Kb7 Kc4 3.Kc7 Kd3 4.Kd7 Ke3 5.Ke8
                               Kf2 6.g4 Kg2 7.Kf7 Kxh2 {EGTB} {-80}
   3581905  24.746 -Mat23 16t+ 1.g3 h5 2.Kxa7 Kd4 3.Kb7 Kd5 4.b6 g4 5.Ka7 h4
                               6.gxh4 Kc4 7.b7 g3 8.b8=Q gxh2
   5493193  31.917  -0.40 16t  1.g3 Kb4 2.g4 Ka4 3.b6 axb6 4.Kxb6 Kb4 5.Kc6
                               Kc4 6.Kd6H Kd4H 7.Ke6H Ke4H 8.Kf6H Kf4H 9.Kg6H
                               Kxg4H 10.Kxh6H Kf4H {0}
   5935866  35.126  -0.39 16t+ 1.h3 h5 2.Kxa7 Kxb5 3.Kb7 Kc5 4.Kc7 Kd5 5.Kd7
                               Kd4 6.Ke6 Ke4 7.Kd6 Kf5 8.Kd7H Ke5H 9.Ke8H Ke4H
                               10.Kf7H h4H 11.Kf6H Kf4H 12.Kg6H g4H 13.hxg4H
                               Kxg4H 14.Kg7H Kf4H 15.Kf7H Ke3H 16.Ke7H {0}
   6707445  38.076   0.00 16t  1.h3 h5 2.Kxa7 Kxb5 3.Kb7 Kc5 4.Kc7 Kd5 5.Kd7
                               Ke5 6.Ke7 Kf5 7.Kf7 h4 8.Kg7 g4 9.hxg4+ Kxg4
                               10.Kg6 Kg3H 11.Kh5H Kxg2H 12.Kxh4H {0}
   6985998  39.339   0.00 16.  1.h3 h5 2.Kxa7 Kxb5 3.Kb7 Kc5 4.Kc7 Kd5 5.Kd7
                               Ke5 6.Ke7 Kf5 7.Kf7 h4 8.Kg7 g4 9.hxg4+ Kxg4
                               10.Kg6 Kg3 11.Kh5 Kxg2 12.Kxh4 {0}
   7469770  42.193   0.00 17t  1.h3 h5 2.Kxa7 Kxb5 3.Kb7 Kc5 4.Kc7 Kd5 5.Kd7
                               Ke5 6.Ke7 Kf5 7.Kf7 h4 8.Kg7 g4 9.hxg4+ Kxg4
                               10.Kg6 Kg3 11.Kh5 Kxg2H 12.Kxh4H {0}
   7977892  45.128   0.00 17.  1.h3 h5 2.Kxa7 Kxb5 3.Kb7 Kc5 4.Kc7 Kd5 5.Kd7
                               Ke5 6.Ke7 Kf5 7.Kf7 h4 8.Kg7 g4 9.hxg4+ Kxg4
                               10.Kg6 Kg3 11.Kh5 Kxg2 12.Kxh4 {0}
   8578825  48.631   0.00 18t  1.h3 h5 2.Kxa7 Kxb5 3.Kb7 Kc5 4.Kc7 Kd5 5.Kd7
                               Ke5 6.Ke7 Kf5 7.Kf7 h4 8.Kg7 g4 9.hxg4+ {EGTB}
                               {80}
   9367283  52.254   0.00 18.  1.h3 h5 2.Kxa7 Kxb5 3.Kb7 Kc5 4.Kc7 Kd5 5.Kd7
                               Ke5 6.Ke7 Kf5 7.Kf7 h4 8.Kg7 g4 9.hxg4+ {EGTB}
                               {80}
  10342006  58.304   0.00 19t  1.h3 h5 2.Kxa7 Kxb5 3.Kb7 Kc5 4.Kc7 Kd5 5.Kd7
                               Ke5 6.Ke7 Kf5 7.Kf7 h4 8.Kg7 g4 9.hxg4+ {EGTB}
                               {80}
  11362661  1:03.7   0.00 19.  1.h3 h5 2.Kxa7 Kxb5 3.Kb7 Kc5 4.Kc7 Kd5 5.Kd7
                               Ke5 6.Ke7 Kf5 7.Kf7 h4 8.Kg7 g4 9.hxg4+ {EGTB}
                               {80}
  13080611  1:11.9   0.00 20t  1.h3 h5 2.Kxa7 Kxb5 3.Kb7 Kc5 4.Kc7 Kd5 5.Kd7
                               Ke5 6.Ke7 Kf5 7.Kf7 h4 8.Kg7 g4 9.hxg4+ {EGTB}
                               {80}
  14713415  1:20.3   0.00 20.  1.h3 h5 2.Kxa7 Kxb5 3.Kb7 Kc5 4.Kc7 Kd5 5.Kd7
                               Ke5 6.Ke7 Kf5 7.Kf7 h4 8.Kg7 g4 9.hxg4+ {EGTB}
                               {80}
  18353627  1:41.9   0.00 21t  1.h3 h5 2.Kxa7 Kxb5 3.Kb7 Kc5 4.Kc7 Kd5 5.Kd7
                               Ke5 6.Ke7 Kf5 7.Kf7 h4 8.Kg7 g4 9.hxg4+ {EGTB}
                               {80}
  20839488  1:55.2   0.00 21.  1.h3 h5 2.Kxa7 Kxb5 3.Kb7 Kc5 4.Kc7 Kd5 5.Kd7
                               Ke5 6.Ke7 Kf5 7.Kf7 h4 8.Kg7 g4 9.hxg4+ {EGTB}
                               {80}
  25214581  2:18.7   0.00 22t  1.h3 h5 2.Kxa7 Kxb5 3.Kb7 Kc5 4.Kc7 Kd5 5.Kd7
                               Ke5 6.Ke7 Kf5 7.Kf7 h4 8.Kg7 g4 9.hxg4+ {EGTB}
                               {80}
  30123422  2:42.2   0.00 22.  1.h3 h5 2.Kxa7 Kxb5 3.Kb7 Kc5 4.Kc7 Kd5 5.Kd7
                               Ke5 6.Ke7 Kf5 7.Kf7 h4 8.Kg7 g4 9.hxg4+ {EGTB}
                               {80}
  39345500  3:27.5   0.00 23t  1.h3 h5 2.Kxa7 Kxb5 3.Kb7 Kc5 4.Kc7 Kd5 5.Kd7
                               Ke5 6.Ke7 Kf5 7.Kf7 h4 8.Kg7 g4 9.hxg4+ {EGTB}
                               {80}
  46457295  4:00.1   0.00 23.  1.h3 h5 2.Kxa7 Kxb5 3.Kb7 Kc5 4.Kc7 Kd5 5.Kd7
                               Ke5 6.Ke7 Kf5 7.Kf7 h4 8.Kg7 g4 9.hxg4+ {EGTB}
                               {80}
  66044987  5:13.6   0.00 24t  1.h3 h5 2.Kxa7 Kxb5 3.Kb7 Kc5 4.Kc7 Kd5 5.Kd7
                               Ke5 6.Ke7 Kf5 7.Kf7 h4 8.Kg7 g4 9.hxg4+ {EGTB}
                               {80}
  80945715  6:09.4   0.00 24.  1.h3 h5 2.Kxa7 Kxb5 3.Kb7 Kc5 4.Kc7 Kd5 5.Kd7
                               Ke5 6.Ke7 Kf5 7.Kf7 h4 8.Kg7 g4 9.hxg4+ {EGTB}
                               {80}
 113749021  8:01.5   0.00 25t  1.h3 h5 2.Kxa7 Kxb5 3.Kb7 Kc5 4.Kc7 Kd5 5.Kd7
                               Ke5 6.Ke7 Kf5 7.Kf7 h4 8.Kg7 g4 9.hxg4+ {EGTB}
                               {80}
 138236926  9:26.1   0.00 25.  1.h3 h5 2.Kxa7 Kxb5 3.Kb7 Kc5 4.Kc7 Kd5 5.Kd7
                               Ke5 6.Ke7 Kf5 7.Kf7 h4 8.Kg7 g4 9.hxg4+ {EGTB}
                               {80}
 192703731 12:15.5   0.00 26t  1.h3 h5 2.Kxa7 Kxb5 3.Kb7 Kc5 4.Kc7 Kd5 5.Kd7
                               Ke5 6.Ke7 Kf5 7.Kf7 h4 8.Kg7 g4 9.hxg4+ {EGTB}
                               {80}
 287030680 16:37.9   0.00 26u. 1.h3 h5 2.Kxa7 Kxb5 3.Kb7 Kc5 4.Kc7 Kd5 5.Kd7
                               Ke5 6.Ke7 Kf5 7.Kf7 h4 8.Kg7 g4 9.hxg4+ {EGTB}
                               9...Kg5 10.Kh7 Kxg4 11.Kh6 h3 12.gxh3+! Kh4
                               13.Kh7 Kh5 14.h4 Kxh4 {No mating material} {0}
287030680 Nodes, 6.61% Leavenodes, 287608 Nodes/sec
100518671 eval, 96.58% score, 1877543015 genmoves, 1.19% captures le 234/241
ext: pawn 1251521, rcp 75766, chk 461, repchk 1556206, null 118002, prune
9089535
htable: 155742361 store, 0 rejected, 286699887 probe, 60.8% f/p, 112.0% f/s
entries 5416665 age 0 renew 0
egtb probes 1215870, found 1215870 max_depth 43
ok after 35.13 sec
test_nodes 5935866 l 2164443
  1 tested,   1 found,   0 mates
287030680 nodes, 18959783 leavenodes in 998.55 sec 287447 n/s
test nodes 5935866 win nodes 5935866 mate nodes 0
win time 35.13 mate time 0.00 av depth 25.000 (nm 25.000) maxdepth 43, tu 885
log(win_nodes) = 6.77348 log(win_time) = 1.54563
white ( 1):



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