XG 3-ply played 23/21 17/13 here. It may not seem that there is much difference between 23/21 17/13 and 23/17, but for example 33 is an anti-joker for Blue after 23/21 17/13, and 31 isn't so hot either.

              
 
              
 | | White is Player 2
score: 0 pip: 169 | 7 point match | pip: 78 score: 0
Blue is Player 1 | |
XGID=cBCDBB----b-b----Abbb--Ab-:2:-1:1:42:0:0:0:7:10 |
Blue to play 42 |
1. | Rollout1 | 23/17 | eq: +1.645 |
| Player: Opponent: | 94.07% (G:87.97% B:1.07%) 5.93% (G:0.58% B:0.01%) | Conf.: ± 0.006 (+1.638...+1.651) - [100.0%] Duration: 4 minutes 12 seconds |
|
2. | Rollout1 | 23/21 17/13 | eq: +1.553 (-0.092) |
| Player: Opponent: | 91.66% (G:84.90% B:1.07%) 8.34% (G:0.83% B:0.01%) | Conf.: ± 0.007 (+1.546...+1.560) - [0.0%] Duration: 4 minutes 41 seconds |
|
|
1 1296 Games rolled with Variance Reduction. Dice Seed: 271828 Moves: 3-ply, cube decisions: XG Roller
|
eXtreme Gammon Version: 2.19.211.pre-release, MET: Kazaross XG2
Variant:

              
 
              
 | | White is Player 2
score: 0 pip: 167 | 7 point match | pip: 78 score: 0
Blue is Player 1 | |
XGID=cBCDBB-----bb----Abbb--Ab-:2:-1:1:42:0:0:0:7:10 |
Blue to play 42 |
1. | Rollout1 | 23/21 17/13 | eq: +1.582 |
| Player: Opponent: | 92.49% (G:85.64% B:1.32%) 7.51% (G:0.63% B:0.02%) | Conf.: ± 0.006 (+1.577...+1.588) - [92.3%] Duration: 3 minutes 14 seconds |
|
2. | Rollout1 | 23/17 | eq: +1.576 (-0.006) |
| Player: Opponent: | 92.34% (G:85.41% B:1.04%) 7.66% (G:0.63% B:0.02%) | Conf.: ± 0.006 (+1.570...+1.583) - [7.7%] Duration: 2 minutes 49 seconds |
|
|
1 1296 Games rolled with Variance Reduction. Dice Seed: 52672062 Moves: 3-ply, cube decisions: XG Roller
|
eXtreme Gammon Version: 2.19.211.pre-release, MET: Kazaross XG2