I decided to roll out a couple of variants of Leo's position. Can't say I fully understand all the nuances, but it seems that how sixes play is a significant factor.
Variant 1:

              
 
              
 | | White is Player 2
score: 0 pip: 134 | Money session Jacoby | pip: 130 score: 0
Blue is Player 1 | |
| XGID=-a----ECDaA--A-b-bde----A-:0:0:1:42:0:0:1:0:10 |
| Blue to play 42 |
| 1. | Rollout1 | 24/22 13/9* | eq: +0.194 |
| Player: Opponent: | 54.71% (G:14.41% B:0.84%) 45.29% (G:10.96% B:0.48%) | Conf: ± 0.013 (+0.181...+0.207) Duration: 3 hours 18 minutes |
|
| 2. | Rollout1 | 13/9* 9/7 | eq: +0.144 (-0.049) |
| Player: Opponent: | 53.51% (G:13.71% B:0.71%) 46.49% (G:9.39% B:0.35%) | Conf: ± 0.014 (+0.130...+0.158) Duration: 2 hours 53 minutes |
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| |
1 2592 Games rolled with Variance Reduction. Dice Seed: 2 Moves and cube decisions: 3 ply
|
eXtreme Gammon Version: 1.21
Variant 2:

              
 
              
 | | White is Player 2
score: 0 pip: 132 | Money session Jacoby | pip: 129 score: 0
Blue is Player 1 | |
| XGID=-a----ECDaA--A--bbde---A--:0:0:1:42:0:0:1:0:10 |
| Blue to play 42 |
| 1. | Rollout1 | 23/21 13/9* | eq: +0.135 |
| Player: Opponent: | 53.16% (G:13.74% B:0.76%) 46.84% (G:11.88% B:0.59%) | Conf: ± 0.010 (+0.125...+0.145) Duration: 6 hours 06 minutes |
|
| 2. | Rollout1 | 13/9* 9/7 | eq: +0.088 (-0.046) |
| Player: Opponent: | 51.82% (G:13.01% B:0.66%) 48.18% (G:9.98% B:0.37%) | Conf: ± 0.010 (+0.078...+0.098) Duration: 5 hours 45 minutes |
|
| |
1 5184 Games rolled with Variance Reduction. Dice Seed: 2 Moves and cube decisions: 3 ply
|
eXtreme Gammon Version: 1.21