21/16 21/15 comes out ahead at DMP, GG, and ATS, but is slightly edged out by 21/10 for money, presumably because it loses too many gammons. At GS, 21/10 is essentially tied with 13/8 13/7.
Money:

              
 
              
 | | White is Player 2
score: 0 pip: 117 | Unlimited Game Jacoby Beaver | pip: 125 score: 0
Blue is Player 1 | |
| XGID=-a-BBCB-B---bB---bccbB--b-:0:0:1:56:0:0:3:0:10 |
| Blue to play 56 |
| 1. | Rollout1 | 21/10 | eq: +0.324 |
| Player: Opponent: | 58.64% (G:15.09% B:0.56%) 41.36% (G:11.03% B:0.25%) | Conf.: ± 0.006 (+0.318...+0.330) - [99.9%] Duration: 10 minutes 04 seconds |
|
| 2. | Rollout1 | 21/16 21/15 | eq: +0.311 (-0.014) |
| Player: Opponent: | 59.97% (G:14.35% B:0.68%) 40.03% (G:13.10% B:0.27%) | Conf.: ± 0.006 (+0.304...+0.317) - [0.1%] Duration: 10 minutes 05 seconds |
|
| 3. | Rollout1 | 13/8 13/7 | eq: +0.193 (-0.131) |
| Player: Opponent: | 52.99% (G:13.87% B:0.33%) 47.01% (G:6.89% B:0.21%) | Conf.: ± 0.006 (+0.187...+0.199) - [0.0%] Duration: 8 minutes 44 seconds |
|
| |
1 5184 Games rolled with Variance Reduction. Dice Seed: 271828 Moves: 3-ply, cube decisions: XG Roller
|
eXtreme Gammon Version: 2.19.207.pre-release
2a3a:

              
 
              
 | | White is Player 2
score: 0 pip: 117 | | 3 point match | pip: 125 score: 1
Blue is Player 1 | |
| XGID=-a-BBCB-B---bB---bccbB--b-:0:0:1:56:1:0:0:3:10 |
| Blue to play 56 |
| 1. | Rollout1 | 21/16 21/15 | eq: +0.245 |
| Player: Opponent: | 60.00% (G:14.74% B:1.10%) 40.00% (G:13.61% B:0.36%) | Conf.: ± 0.006 (+0.239...+0.251) - [100.0%] Duration: 13 minutes 19 seconds |
|
| 2. | Rollout1 | 21/10 | eq: +0.208 (-0.038) |
| Player: Opponent: | 58.41% (G:16.96% B:1.42%) 41.59% (G:11.43% B:0.34%) | Conf.: ± 0.006 (+0.202...+0.214) - [0.0%] Duration: 13 minutes 42 seconds |
|
| 3. | Rollout1 | 13/8 13/7 | eq: +0.052 (-0.193) |
| Player: Opponent: | 52.81% (G:14.03% B:0.51%) 47.19% (G:6.73% B:0.26%) | Conf.: ± 0.004 (+0.048...+0.057) - [0.0%] Duration: 12 minutes 23 seconds |
|
| |
1 5184 Games rolled with Variance Reduction. Dice Seed: 271828 Moves: 3-ply, cube decisions: XG Roller
|
eXtreme Gammon Version: 2.19.207.pre-release, MET: Kazaross XG2
Gammon go:

              
 
              
 | | White is Player 2
score: 1 pip: 117 | 2 point match Crawford | pip: 125 score: 0
Blue is Player 1 | |
| XGID=-a-BBCB-B---bB---bccbB--b-:0:0:1:56:0:1:1:2:10 |
| Blue to play 56 |
| 1. | Rollout1 | 21/16 21/15 | eq: +0.493 |
| Player: Opponent: | 59.47% (G:15.17% B:0.85%) 40.53% (G:13.79% B:0.35%) | Conf.: ± 0.003 (+0.489...+0.496) - [100.0%] Duration: 7 minutes 47 seconds |
|
| 2. | Rollout1 | 21/10 | eq: +0.483 (-0.010) |
| Player: Opponent: | 57.94% (G:16.20% B:0.89%) 42.06% (G:11.05% B:0.26%) | Conf.: ± 0.003 (+0.480...+0.486) - [0.0%] Duration: 7 minutes 04 seconds |
|
| |
1 5184 Games rolled with Variance Reduction. Dice Seed: 271828 Moves: 3-ply, cube decisions: XG Roller
|
eXtreme Gammon Version: 2.19.207.pre-release, MET: Kazaross XG2
Gammon save:

              
 
              
 | | White is Player 2
score: 0 pip: 117 | 2 point match Crawford | pip: 125 score: 1
Blue is Player 1 | |
| XGID=-a-BBCB-B---bB---bccbB--b-:0:0:1:56:1:0:1:2:10 |
| Blue to play 56 |
| 1. | Rollout1 | 13/8 13/7 | eq: -0.059 |
| Player: Opponent: | 52.28% (G:12.31% B:0.95%) 47.72% (G:5.25% B:0.26%) | Conf.: ± 0.002 (-0.062...-0.057) - [96.2%] Duration: 7 minutes 24 seconds |
|
| 2. | Rollout1 | 21/10 | eq: -0.063 (-0.003) |
| Player: Opponent: | 58.88% (G:17.24% B:1.94%) 41.12% (G:12.02% B:0.51%) | Conf.: ± 0.003 (-0.066...-0.060) - [3.8%] Duration: 7 minutes 28 seconds |
|
| 3. | Rollout1 | 21/16 21/15 | eq: -0.070 (-0.011) |
| Player: Opponent: | 60.47% (G:15.09% B:1.57%) 39.53% (G:13.97% B:0.62%) | Conf.: ± 0.003 (-0.073...-0.067) - [0.0%] Duration: 7 minutes 49 seconds |
|
| |
1 5184 Games rolled with Variance Reduction. Dice Seed: 271828 Moves: 3-ply, cube decisions: XG Roller
|
eXtreme Gammon Version: 2.19.207.pre-release, MET: Kazaross XG2