I always suffer from this little 21. Today I compare three positions to see the difference. The only difference between problems are Blue's inner board. I wonder why the best play changes as Blue shift the point.
        
 
          
 | | White is Player 2
score: 0
pip: 152 | Unlimited Game
Jacoby Beaver | pip: 168
score: 0
Blue is Player 1 |
|
| XGID=-a--B-D-C-a-eC---b-d-b--BA:0:0:1:21:0:0:3:0:10 |
| Blue to play 21 |
| 1. | XG Roller++ | Bar/22 | eq: -0.332 |
| Player:
Opponent: | 41.55% (G:11.03% B:0.33%)
58.45% (G:16.12% B:1.04%) | |
|
| 2. | XG Roller++ | Bar/23 6/5 | eq: -0.347 (-0.015) |
| Player:
Opponent: | 42.42% (G:11.33% B:0.41%)
57.58% (G:19.44% B:1.59%) | |
|
| 3. | XG Roller++ | Bar/23 24/23 | eq: -0.358 (-0.027) |
| Player:
Opponent: | 40.81% (G:10.94% B:0.33%)
59.19% (G:15.86% B:0.84%) | |
|
| 4. | XG Roller+ | Bar/23 8/7 | eq: -0.400 (-0.068) |
| Player:
Opponent: | 40.64% (G:10.90% B:0.39%)
59.36% (G:18.95% B:1.44%) | |
|
| 5. | 2-ply | Bar/24 6/4 | eq: -0.428 (-0.096) |
| Player:
Opponent: | 38.57% (G:10.31% B:0.43%)
61.43% (G:19.20% B:1.45%) | |
|
eXtreme Gammon Version: 2.10
| | White is Player 2
score: 0
pip: 152 | Unlimited Game
Jacoby Beaver | pip: 166
score: 0
Blue is Player 1 |
|
| XGID=-a-B--D-C-a-eC---b-d-b--BA:0:0:1:21:0:0:3:0:10 |
| Blue to play 21 |
| 1. | XG Roller++ | Bar/23 24/23 | eq: -0.394 |
| Player:
Opponent: | 39.84% (G:10.91% B:0.33%)
60.16% (G:16.76% B:0.90%) | |
|
| 2. | XG Roller++ | Bar/22 | eq: -0.428 (-0.034) |
| Player:
Opponent: | 39.40% (G:10.58% B:0.35%)
60.60% (G:17.87% B:1.23%) | |
|
| 3. | 4-ply | Bar/23 6/5 | eq: -0.412 (-0.018) |
| Player:
Opponent: | 40.09% (G:10.57% B:0.37%)
59.91% (G:19.17% B:1.52%) | |
|
| 4. | 4-ply | Bar/23 8/7 | eq: -0.471 (-0.077) |
| Player:
Opponent: | 38.58% (G:10.34% B:0.35%)
61.42% (G:19.70% B:1.59%) | |
|
| 5. | 3-ply | Bar/24 6/4 | eq: -0.549 (-0.155) |
| Player:
Opponent: | 36.93% (G:10.02% B:0.40%)
63.07% (G:21.54% B:1.92%) | |
|
eXtreme Gammon Version: 2.10
| | White is Player 2
score: 0
pip: 152 | Unlimited Game
Jacoby Beaver | pip: 164
score: 0
Blue is Player 1 |
|
| XGID=-aB---D-C-a-eC---b-d-b--BA:0:0:1:21:0:0:3:0:10 |
| Blue to play 21 |
| 1. | XG Roller++ | Bar/22 | eq: -0.481 |
| Player:
Opponent: | 37.70% (G:10.34% B:0.34%)
62.30% (G:17.89% B:1.19%) | |
|
| 2. | XG Roller++ | Bar/23 24/23 | eq: -0.498 (-0.017) |
| Player:
Opponent: | 37.20% (G:10.16% B:0.29%)
62.80% (G:17.33% B:0.94%) | |
|
| 3. | 3-ply | Bar/23 6/5 | eq: -0.527 (-0.046) |
| Player:
Opponent: | 37.46% (G:10.01% B:0.40%)
62.54% (G:20.65% B:1.72%) | |
|
| 4. | 3-ply | Bar/23 8/7 | eq: -0.558 (-0.077) |
| Player:
Opponent: | 36.40% (G:10.07% B:0.35%)
63.60% (G:20.59% B:1.73%) | |
|
| 5. | 2-ply | Bar/24 8/6 | eq: -0.643 (-0.161) |
| Player:
Opponent: | 34.40% (G:9.41% B:0.34%)
65.60% (G:21.18% B:1.63%) | |
|
eXtreme Gammon Version: 2.10