[Bug-gnubg] Poor Judgement of Supremo Checker Setting?

[Nathaniel Gibson]

 GNU Backgammon  Position ID: bNuUEBDB2wEAPg
                 Match ID   : 8AnyAGAAEAAA
 +13-14-15-16-17-18------19-20-21-22-23-24-+     O: gnubg
 | O     O  O     O |   | O  O  O  O     X |     6 points
 |                O |   | O  O  O  O     X |
 |                  |   |                X |
 |                  |   |                X |
 |                  |   |                X |
v|                  |BAR|                  |     7 point match (Cube: 1)
 |                  |   |                  |     Crawford game
 |                  |   | X                |
 |             X    |   | X                |
 |             X  X |   | X                |     Rolled 44
 |          O  X  X |   | X           O  X |     2 points
 +12-11-10--9--8--7-------6--5--4--3--2--1-+     X: Nathaniel

I played 8/4(2) 6/2*(2).

(Supremo checker play analysis <weights version 0.14>)

    1. Cubeful 2-ply    8/4(2) 7/3 6/2*              Eq.:  -0.902
       0.049 0.003 0.000 - 0.951 0.778 0.232
        2-ply cubeful 100% speed [world class]
    2. Cubeful 2-ply    8/4 7/3 6/2*(2)              Eq.:  -0.909 ( -0.007)
       0.046 0.002 0.000 - 0.954 0.790 0.238
        2-ply cubeful 100% speed [world class]
    3. Cubeful 2-ply    7/3 6/2*(3)                  Eq.:  -0.914 ( -0.012)
       0.043 0.001 0.000 - 0.957 0.793 0.250
        2-ply cubeful 100% speed [world class]
    4. Cubeful 2-ply    8/4 7/3(2) 6/2*              Eq.:  -0.917 ( -0.015)
       0.042 0.003 0.000 - 0.958 0.775 0.183
        2-ply cubeful 100% speed [world class]
    5. Cubeful 2-ply    8/4 6/2*(3)                  Eq.:  -0.920 ( -0.018)
       0.040 0.001 0.000 - 0.960 0.788 0.222
        2-ply cubeful 100% speed [world class]
   *6. Cubeful 2-ply    8/4(2) 6/2*(2)               Eq.:  -0.920 ( -0.018)
       0.040 0.004 0.000 - 0.960 0.761 0.149
        2-ply cubeful 100% speed [world class]

When I cranked the analysis up to grandmaster, it managed to find the
correct play... but wow, three blots in my inner board, and two in my outer
board? What's it thinking?

   *1. Cubeful 3-ply    8/4(2) 6/2*(2)               Eq.:  -0.930
       0.035 0.003 0.000 - 0.965 0.788 0.155
        3-ply cubeful [grandmaster]
    2. Cubeful 3-ply    8/4(3) 6/2*                  Eq.:  -0.930 ( -0.000)
       0.035 0.002 0.000 - 0.965 0.779 0.138
        3-ply cubeful [grandmaster]
    3. Cubeful 3-ply    8/4(2) 7/3 6/2*              Eq.:  -0.930 ( -0.001)
       0.035 0.001 0.000 - 0.965 0.808 0.213
        3-ply cubeful [grandmaster]
    4. Cubeful 3-ply    8/4 7/3(2) 6/2*              Eq.:  -0.932 ( -0.002)
       0.034 0.001 0.000 - 0.966 0.799 0.172
        3-ply cubeful [grandmaster]
    5. Cubeful 3-ply    8/4(2) 7/3(2)                Eq.:  -0.932 ( -0.003)
       0.034 0.002 0.000 - 0.966 0.771 0.113
        3-ply cubeful [grandmaster]
    6. Cubeful 3-ply    7/3(2) 6/2*(2)               Eq.:  -0.934 ( -0.004)
       0.033 0.002 0.000 - 0.967 0.780 0.132
        3-ply cubeful [grandmaster]

Is there something about this position that I don't understand? Or is this a
failing of one of the nets?

Thanks,

Nathaniel Gibson
address@hidden