Basically you are try to econometrically estimate the parameters in E = B, and hence, there are no parameters to estimate.
Perhaps an econometrical proof would be difficult but there's an easier way. An evaluation is a kind of estimation, and XG's 4-ply evaluation of the 62S-32T-33-d position shown below is [B=E].
        
 
         
 | | White is Player 2
score: 0
pip: 162 | 2 point match
Crawford | pip: 159
score: 1
Blue is Player 1 |
|
| XGID=-b----E-C--AdD---dAe----A-:0:0:1:33:1:0:1:2:10 |
| Blue to play 33 |
| 1. | 4-ply | 24/18 13/10(2) | eq: +0.074 |
| Player:
Opponent: | 61.47% (G:16.29% B:0.63%)
38.53% (G:7.75% B:0.23%) | |
|
| 2. | 4-ply | 24/18 6/3(2) | eq: +0.074 (0.000) |
| Player:
Opponent: | 61.31% (G:16.72% B:0.60%)
38.69% (G:7.59% B:0.21%) | |
|
eXtreme Gammon Version: 2.01, MET: Kazaross XG2
Nack