I'm not sure why stacking on the four point is preferred over simply making the ace, but that's what the rollout says. Probably something to do with specific blotting rolls which I'm too lazy to count. Making the ace is a minor error, and I won't sweat those until I eliminate the whoppers from my repertoire.
Making the five point is a double whopper with cheese, for reasons explained above.

              
 
              
 | | White is Player 2
score: 0 pip: 121 | 13 point match | pip: 80 score: 0
Blue is Player 1 | |
XGID=-AbBC-DCB-a-a-----abbbbb--:1:-1:1:32:0:0:0:13:10 |
Blue to play 32 |
1. | Rollout1 | 7/4 6/4 | eq: +0.463 |
| Player: Opponent: | 74.28% (G:4.45% B:0.06%) 25.72% (G:2.09% B:0.06%) | Conf.: ± 0.004 (+0.458...+0.467) - [100.0%] Duration: 1 minute 51 seconds |
|
2. | Rollout1 | 6/1 | eq: +0.435 (-0.027) |
| Player: Opponent: | 73.41% (G:4.36% B:0.04%) 26.59% (G:2.28% B:0.06%) | Conf.: ± 0.005 (+0.430...+0.440) - [0.0%] Duration: 1 minute 35 seconds |
|
3. | Rollout1 | 6/4 6/3 | eq: +0.401 (-0.061) |
| Player: Opponent: | 72.06% (G:4.01% B:0.05%) 27.94% (G:2.66% B:0.08%) | Conf.: ± 0.005 (+0.396...+0.407) - [0.0%] Duration: 1 minute 27 seconds |
|
4. | Rollout1 | 8/5 7/5 | eq: +0.210 (-0.252) |
| Player: Opponent: | 63.56% (G:8.03% B:0.26%) 36.44% (G:4.38% B:0.16%) | Conf.: ± 0.004 (+0.206...+0.215) - [0.0%] Duration: 1 minute 38 seconds |
|
5. | Rollout1 | 8/6 8/5 | eq: +0.059 (-0.404) |
| Player: Opponent: | 57.09% (G:5.10% B:0.15%) 42.91% (G:5.51% B:0.17%) | Conf.: ± 0.004 (+0.055...+0.063) - [0.0%] Duration: 2 minutes 49 seconds |
|
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1 1296 Games rolled with Variance Reduction. Moves: 3-ply, cube decisions: XG Roller
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eXtreme Gammon Version: 2.10, MET: Kazaross XG2