My OTB choice of 54S is most probably correct.

              
    
              
 | is VanillaGorilla
score: 8 pip: 157 | | 13 point match | pip: 157 score: 0
is neilkaz | |
| XGID=-bB---D-B---eE---b-d---bB-:0:0:1:54:0:8:0:13:10 |
to play 54 |
| 1. | Rollout1 | 24/20 13/8 | eq: +0.155 |
| Player: Opponent: | 51.71% (G:16.24% B:0.98%) 48.29% (G:15.85% B:1.08%) | Conf: ± 0.007 (+0.148...+0.162) Duration: 40 minutes 39 seconds |
|
| 2. | Rollout1 | 13/9 13/8 | eq: +0.143 (-0.012) |
| Player: Opponent: | 50.95% (G:17.34% B:1.06%) 49.05% (G:16.28% B:1.48%) | Conf: ± 0.007 (+0.136...+0.150) Duration: 37 minutes 48 seconds |
|
| |
1 10384 Games rolled with Variance Reduction. Moves and cube decisions: 3 ply
|
eXtreme Gammon Version: 1.12, MET: GnuBG 11 point
Todd's choice to copy my 64P was correct by lots. 
              
    
              
 | is VanillaGorilla
score: 8 pip: 167 | | 13 point match | pip: 157 score: 0
is neilkaz | |
| XGID=-bB---D-B---eE---c-e----B-:0:0:-1:64:0:8:0:13:10 |
to play 64 |
| 1. | Rollout1 | 8/2 6/2 | eq: -0.209 |
| Player: Opponent: | 47.23% (G:15.50% B:1.24%) 52.77% (G:17.19% B:0.99%) | Conf: ± 0.010 (-0.219...-0.199) Duration: 21 minutes 02 seconds |
|
| 2. | Rollout1 | 24/14 | eq: -0.256 (-0.047) |
| Player: Opponent: | 46.83% (G:11.28% B:0.90%) 53.17% (G:18.13% B:0.70%) | Conf: ± 0.009 (-0.265...-0.247) Duration: 24 minutes 55 seconds |
|
| 3. | Rollout1 | 24/18 13/9 | eq: -0.282 (-0.073) |
| Player: Opponent: | 46.56% (G:13.16% B:1.20%) 53.44% (G:19.76% B:1.04%) | Conf: ± 0.010 (-0.292...-0.272) Duration: 26 minutes 14 seconds |
|
| |
1 5184 Games rolled with Variance Reduction. Moves and cube decisions: 3 ply
|
eXtreme Gammon Version: 1.12, MET: GnuBG 11 point