More enlightening in my opinion, and what I always look at first when analyzing a confusing ATS play, even before doing any rollouts, is what happens if you switch to a money game.
I finally got around to plugging this into the bot. (I read BGOnline from a computer with no bot on it, so I have to sneakernet back and forth.) See below. The play I favored, 13/11 8/2*, is pretty close to 21/15 13/11 for money.
If I were going to analyze this further, the next thing I'd do is a GNU rollout, which would allow us (via "View Statistics") to find out how often Blue wins an undoubled gammon from here ATS. (I still can't understand why almost nobody else seems to care about this kind of information, preferring instead to stare slack-jawed at the cubeless gammons and hoping for enlightenment to strike.)
Centered cube:
          
 
          
 | | White is Player 2
score: 0
pip: 115 | | Money session | pip: 129
score: 0
Blue is Player 1 |
|
| XGID=--aBB-B-D--AcC---c-d-A-ac-:0:0:1:62:0:0:0:0:10 |
| Blue to play 62 |
| 1. | XG Roller+ | 21/15 13/11 | eq: +0.553 |
| Player:
Opponent: | 65.03% (G:13.29% B:0.47%)
34.97% (G:6.67% B:0.10%) | |
|
| 2. | XG Roller+ | 13/11 8/2* | eq: +0.549 (-0.005) |
| Player:
Opponent: | 63.62% (G:20.69% B:0.67%)
36.38% (G:9.63% B:0.22%) | |
|
| 3. | XG Roller+ | 8/6 8/2* | eq: +0.507 (-0.046) |
| Player:
Opponent: | 62.19% (G:21.43% B:0.64%)
37.81% (G:10.18% B:0.24%) | |
|
| 4. | XG Roller+ | 21/15 8/6 | eq: +0.499 (-0.055) |
| Player:
Opponent: | 63.03% (G:14.28% B:0.50%)
36.97% (G:6.61% B:0.12%) | |
|
eXtreme Gammon Version: 1.21
With the cube turned:
| | White is Player 2
score: 0
pip: 115 | | Money session | pip: 129
score: 0
Blue is Player 1 |
|
| XGID=--aBB-B-D--AcC---c-d-A-ac-:1:-1:1:62:0:0:0:0:10 |
| Blue to play 62 |
| 1. | XG Roller+ | 13/11 8/2* | eq: +0.266 |
| Player:
Opponent: | 63.75% (G:21.21% B:0.66%)
36.25% (G:9.67% B:0.23%) | |
|
| 2. | XG Roller+ | 21/15 13/11 | eq: +0.250 (-0.016) |
| Player:
Opponent: | 65.15% (G:13.33% B:0.49%)
34.85% (G:6.77% B:0.09%) | |
|
| 3. | XG Roller+ | 8/6 8/2* | eq: +0.236 (-0.030) |
| Player:
Opponent: | 62.33% (G:21.90% B:0.63%)
37.67% (G:10.07% B:0.25%) | |
|
| 4. | XG Roller+ | 21/15 8/6 | eq: +0.213 (-0.053) |
| Player:
Opponent: | 63.13% (G:14.48% B:0.51%)
36.87% (G:6.71% B:0.11%) | |
|
eXtreme Gammon Version: 1.21