[Bug-gnubg] Serious rollout error

[Tom]

Something has gone terribly wrong
here.

gnubg 0.14.3
Position ID: 3w8AAMh2GxIgAQ
Match ID: QolpAAAAAAAA

Two ply analysis:

    1. Cubeful 2-ply    20/18 10/7                   MWC:  83.14%
       0.831 0.000 0.000 - 0.169 0.029 0.000
        2-ply cubeful 100% speed [world class]
    2. Cubeful 2-ply    22/20 10/7                   MWC:  82.45% (
-0.69%)
       0.824 0.000 0.000 - 0.176 0.029 0.000
        2-ply cubeful 100% speed [world class]
    3. Cubeful 2-ply    12/7                         MWC:  82.37% (
-0.77%)
       0.824 0.000 0.000 - 0.176 0.030 0.000
        2-ply cubeful 100% speed [world class]
    4. Cubeful 2-ply    20/15                        MWC:  81.43% (
-1.71%)
       0.814 0.000 0.000 - 0.186 0.026 0.000
        2-ply cubeful 100% speed [world class]
    5. Cubeful 2-ply    20/17 10/8                   MWC:  81.37% (
-1.77%)
       0.814 0.000 0.000 - 0.186 0.027 0.000
        2-ply cubeful 100% speed [world class]
    6. Cubeful 2-ply    22/17                        MWC:  81.02% (
-2.12%)
       0.810 0.000 0.000 - 0.190 0.025 0.000
        2-ply cubeful 100% speed [world class]
    7. Cubeful 2-ply    22/19 10/8                   MWC:  80.86% (
-2.28%)
       0.809 0.000 0.000 - 0.191 0.027 0.000
        2-ply cubeful 100% speed [world class]
    8. Cubeful 2-ply    20/18 12/9                   MWC:  80.85% (
-2.29%)
       0.809 0.000 0.000 - 0.191 0.028 0.000
        2-ply cubeful 100% speed [world class]
    9. Cubeful 2-ply    10/7 4/2                     MWC:  80.72% (
-2.42%)
       0.807 0.000 0.000 - 0.193 0.034 0.000
        2-ply cubeful 100% speed [world class]
   10. Cubeful 2-ply    22/19 20/18                  MWC:  80.69% (
-2.45%)
       0.807 0.000 0.000 - 0.193 0.025 0.000
        2-ply cubeful 100% speed [world class]
   11. Cubeful 2-ply    12/9 10/8                    MWC:  80.64% (
-2.50%)
       0.806 0.000 0.000 - 0.194 0.029 0.000
        2-ply cubeful 100% speed [world class]
   12. Cubeful 2-ply    10/5                         MWC:  79.87% (
-3.27%)
       0.799 0.000 0.000 - 0.201 0.026 0.000
        2-ply cubeful 100% speed [world class]
   13. Cubeful 2-ply    22/20 12/9                   MWC:  79.70% (
-3.44%)
       0.797 0.000 0.000 - 0.203 0.029 0.000
        2-ply cubeful 100% speed [world class]
   14. Cubeful 2-ply    20/17 12/10                  MWC:  79.55% (
-3.59%)
       0.795 0.000 0.000 - 0.205 0.029 0.000
        2-ply cubeful 100% speed [world class]
   15. Cubeful 2-ply    20/17 4/2                    MWC:  79.29% (
-3.85%)
       0.793 0.000 0.000 - 0.207 0.036 0.000
        2-ply cubeful 100% speed [world class]
   16. Cubeful 2-ply    22/19 12/10                  MWC:  79.09% (
-4.05%)
       0.791 0.000 0.000 - 0.209 0.029 0.000
        2-ply cubeful 100% speed [world class]

I then rolled these out, and the
BEST 2 ply move come out on the
bottom (with an obviously wrong
number).

    1. Rollout          22/20 10/7                   MWC:  82.12%
       0.821 0.000 0.000 - 0.179 0.031 0.000 CL  82.12%
      [0.001 0.000 0.000 - 0.001 0.001 0.000 CL   0.15%]
        Truncated cubeless rollout (depth 11) (trunc. at one-sided
bearoff) with var.redn.
        216 games, Mersenne Twister dice gen. with seed 2032818251 and
quasi-random dice
        Play: 0-ply cubeful
        Cube: 0-ply cubeful
    2. Rollout          12/7                         MWC:  81.39% (
-0.73%)
       0.814 0.000 0.000 - 0.186 0.033 0.000 CL  81.39%
      [0.001 0.000 0.000 - 0.001 0.001 0.000 CL   0.12%]
        Truncated cubeless rollout (depth 11) (trunc. at one-sided
bearoff) with var.redn.
        216 games, Mersenne Twister dice gen. with seed 2032818251 and
quasi-random dice
        Play: 0-ply cubeful
        Cube: 0-ply cubeful
    3. Rollout          10/7 4/2                     MWC:  81.10% (
-1.03%)
       0.811 0.000 0.000 - 0.189 0.038 0.000 CL  81.10%
      [0.001 0.000 0.000 - 0.001 0.001 0.000 CL   0.15%]
        Truncated cubeless rollout (depth 11) (trunc. at one-sided
bearoff) with var.redn.
        216 games, Mersenne Twister dice gen. with seed 2032818251 and
quasi-random dice
        Play: 0-ply cubeful
        Cube: 0-ply cubeful
    4. Rollout          20/17 10/8                   MWC:  80.29% (
-1.84%)
       0.803 0.000 0.000 - 0.197 0.031 0.000 CL  80.29%
      [0.002 0.000 0.000 - 0.002 0.001 0.000 CL   0.16%]
        Truncated cubeless rollout (depth 11) (trunc. at one-sided
bearoff) with var.redn.
        216 games, Mersenne Twister dice gen. with seed 2032818251 and
quasi-random dice
        Play: 0-ply cubeful
        Cube: 0-ply cubeful
    5. Rollout          20/15                        MWC:  80.13% (
-1.99%)
       0.801 0.000 0.000 - 0.199 0.032 0.000 CL  80.13%
      [0.001 0.000 0.000 - 0.001 0.001 0.000 CL   0.15%]
        Truncated cubeless rollout (depth 11) (trunc. at one-sided
bearoff) with var.redn.
        216 games, Mersenne Twister dice gen. with seed 2032818251 and
quasi-random dice
        Play: 0-ply cubeful
        Cube: 0-ply cubeful
    6. Rollout          22/19 10/8                   MWC:  80.05% (
-2.07%)
       0.801 0.000 0.000 - 0.199 0.033 0.000 CL  80.05%
      [0.001 0.000 0.000 - 0.001 0.001 0.000 CL   0.15%]
        Truncated cubeless rollout (depth 11) (trunc. at one-sided
bearoff) with var.redn.
        216 games, Mersenne Twister dice gen. with seed 2032818251 and
quasi-random dice
        Play: 0-ply cubeful
        Cube: 0-ply cubeful
    7. Rollout          22/17                        MWC:  80.03% (
-2.09%)
       0.800 0.000 0.000 - 0.200 0.033 0.000 CL  80.03%
      [0.001 0.000 0.000 - 0.001 0.002 0.000 CL   0.15%]
        Truncated cubeless rollout (depth 11) (trunc. at one-sided
bearoff) with var.redn.
        216 games, Mersenne Twister dice gen. with seed 2032818251 and
quasi-random dice
        Play: 0-ply cubeful
        Cube: 0-ply cubeful
    8. Rollout          22/19 20/18                  MWC:  79.73% (
-2.40%)
       0.797 0.000 0.000 - 0.203 0.034 0.000 CL  79.73%
      [0.002 0.000 0.000 - 0.002 0.002 0.000 CL   0.16%]
        Truncated cubeless rollout (depth 11) (trunc. at one-sided
bearoff) with var.redn.
        216 games, Mersenne Twister dice gen. with seed 2032818251 and
quasi-random dice
        Play: 0-ply cubeful
        Cube: 0-ply cubeful
    9. Rollout          20/18 12/9                   MWC:  79.43% (
-2.70%)
       0.794 0.000 0.000 - 0.206 0.034 0.000 CL  79.43%
      [0.002 0.000 0.000 - 0.002 0.001 0.001 CL   0.16%]
        Truncated cubeless rollout (depth 11) (trunc. at one-sided
bearoff) with var.redn.
        216 games, Mersenne Twister dice gen. with seed 2032818251 and
quasi-random dice
        Play: 0-ply cubeful
        Cube: 0-ply cubeful
   10. Rollout          12/9 10/8                    MWC:  79.32% (
-2.80%)
       0.793 0.000 0.000 - 0.207 0.033 0.000 CL  79.32%
      [0.002 0.000 0.000 - 0.002 0.001 0.000 CL   0.15%]
        Truncated cubeless rollout (depth 11) (trunc. at one-sided
bearoff) with var.redn.
        216 games, Mersenne Twister dice gen. with seed 2032818251 and
quasi-random dice
        Play: 0-ply cubeful
        Cube: 0-ply cubeful
   11. Rollout          20/17 4/2                    MWC:  79.16% (
-2.96%)
       0.792 0.000 0.000 - 0.208 0.042 0.000 CL  79.16%
      [0.002 0.000 0.000 - 0.002 0.002 0.000 CL   0.15%]
        Truncated cubeless rollout (depth 11) (trunc. at one-sided
bearoff) with var.redn.
        216 games, Mersenne Twister dice gen. with seed 2032818251 and
quasi-random dice
        Play: 0-ply cubeful
        Cube: 0-ply cubeful
   12. Rollout          10/5                         MWC:  78.37% (
-3.75%)
       0.784 0.000 0.000 - 0.216 0.036 0.000 CL  78.37%
      [0.002 0.000 0.000 - 0.002 0.001 0.001 CL   0.15%]
        Truncated cubeless rollout (depth 11) (trunc. at one-sided
bearoff) with var.redn.
        216 games, Mersenne Twister dice gen. with seed 2032818251 and
quasi-random dice
        Play: 0-ply cubeful
        Cube: 0-ply cubeful
   13. Rollout          22/20 12/9                   MWC:  78.18% (
-3.94%)
       0.782 0.000 0.000 - 0.218 0.035 0.000 CL  78.18%
      [0.002 0.000 0.000 - 0.002 0.001 0.000 CL   0.16%]
        Truncated cubeless rollout (depth 11) (trunc. at one-sided
bearoff) with var.redn.
        216 games, Mersenne Twister dice gen. with seed 2032818251 and
quasi-random dice
        Play: 0-ply cubeful
        Cube: 0-ply cubeful
   14. Rollout          20/17 12/10                  MWC:  77.82% (
-4.31%)
       0.778 0.000 0.000 - 0.222 0.035 0.000 CL  77.82%
      [0.001 0.000 0.000 - 0.001 0.002 0.000 CL   0.15%]
        Truncated cubeless rollout (depth 11) (trunc. at one-sided
bearoff) with var.redn.
        216 games, Mersenne Twister dice gen. with seed 2032818251 and
quasi-random dice
        Play: 0-ply cubeful
        Cube: 0-ply cubeful
   15. Rollout          22/19 12/10                  MWC:  77.26% (
-4.87%)
       0.773 0.000 0.000 - 0.227 0.039 0.000 CL  77.26%
      [0.002 0.000 0.000 - 0.002 0.001 0.000 CL   0.17%]
        Truncated cubeless rollout (depth 11) (trunc. at one-sided
bearoff) with var.redn.
        216 games, Mersenne Twister dice gen. with seed 2032818251 and
quasi-random dice
        Play: 0-ply cubeful
        Cube: 0-ply cubeful
   16. Rollout          20/18 10/7                   MWC:  17.81%
(-64.31%)
       0.178 0.000 0.000 - 0.822 0.000 0.000 CL  17.81%
      [0.010 0.000 0.000 - 0.010 0.000 0.000 CL   1.02%]
        Truncated cubeless rollout (depth 11) (trunc. at one-sided
bearoff) with var.redn.
        216 games, Mersenne Twister dice gen. with seed 2032818251 and
quasi-random dice
        Play: 0-ply cubeful
        Cube: 0-ply cubeful

I have never seen anything like
this before. What happened?

Tom

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