The size of the equity difference is not necessarily an indication of how obvious the decision should be to a human. (We see the same phenomenon in chess, where supergrandmasters are routinely baffled by what the engine says is a huge point difference. I imagine the same is true in go.)

              
 
              
 | | White is Player 2
score: 0 pip: 146 | Unlimited Game Jacoby Beaver | pip: 153 score: 0
Blue is Player 1 | |
XGID=---a--EBC-a-bCa-bc-e--A-A-:0:0:1:31:0:0:3:0:10 |
Blue to play 31 |
1. | Rollout1 | 8/5 6/5 | eq: +0.038 |
| Player: Opponent: | 49.88% (G:15.59% B:0.61%) 50.12% (G:11.49% B:0.50%) | Conf.: ± 0.011 (+0.026...+0.049) - [77.8%] Duration: 15 minutes 11 seconds |
|
2. | Rollout1 | 22/21 13/10* | eq: +0.031 (-0.006) |
| Player: Opponent: | 50.58% (G:15.37% B:0.88%) 49.42% (G:13.78% B:0.75%) | Conf.: ± 0.010 (+0.021...+0.042) - [20.6%] Duration: 16 minutes 35 seconds |
|
3. | Rollout1 | 13/10* 8/7 | eq: +0.021 (-0.017) |
| Player: Opponent: | 50.10% (G:15.62% B:0.80%) 49.90% (G:13.91% B:0.68%) | Conf.: ± 0.014 (+0.007...+0.034) - [1.7%] Duration: 15 minutes 51 seconds |
|
|
1 2592 Games rolled with Variance Reduction. Dice Seed: 271828 Moves: 3-ply, cube decisions: XG Roller
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eXtreme Gammon Version: 2.19.211.pre-release