The true normalized equity of this position is -3.000. In my version of XG 2.03, the top 32 moves have normalized equities between -2.9999 and -3.0002 at XGR+ (in this position it's impossible to have normalized equity less than -3, so the -3.0002 figure may be related to variance reduction). At XGR, the top 32 moves have normalized equities between -2.9992 and -2.9997. I wasn't able to reproduce your -2.968 figure for 6/4 5/2.
Here's an XGR+ sample:
         
 
        
 | | White is Player 2
score: 6
pip: 10 | | 9 point match | pip: 144
score: 8
Blue is Player 1 |
|
| XGID=-----BE-A---BC--AA-----cd-:1:1:1:32:8:6:0:9:10 |
| Blue to play 32 |
| 1. | XG Roller+ | 13/10 8/6 | eq: -2.9999 |
| Player:
Opponent: | 0.00% (G:0.00% B:0.00%)
100.00% (G:99.99% B:0.00%) | |
|
| 2. | XG Roller+ | 13/11 13/10 | eq: -2.9999 (0.0000) |
| Player:
Opponent: | 0.00% (G:0.00% B:0.00%)
100.00% (G:100.00% B:0.00%) | |
|
| 3. | XG Roller+ | 13/11 8/5 | eq: -3.0000 (-0.0001) |
| Player:
Opponent: | 0.00% (G:0.00% B:0.00%)
100.00% (G:100.00% B:0.00%) | |
|
| 4. | XG Roller+ | 17/14 12/10 | eq: -3.0000 (-0.0001) |
| Player:
Opponent: | 0.00% (G:0.00% B:0.00%)
100.00% (G:100.00% B:0.00%) | |
|
| 5. | XG Roller+ | 12/9 5/3 | eq: -3.0000 (-0.0001) |
| Player:
Opponent: | 0.00% (G:0.00% B:0.00%)
100.00% (G:100.00% B:0.00%) | |
|
| 6. | XG Roller+ | 5/3 5/2 | eq: -3.0000 (-0.0001) |
| Player:
Opponent: | 0.00% (G:0.00% B:0.00%)
100.00% (G:100.00% B:0.00%) | |
|
| 7. | XG Roller+ | 6/4 5/2 | eq: -3.0000 (-0.0001) |
| Player:
Opponent: | 0.00% (G:0.00% B:0.00%)
100.00% (G:100.00% B:0.00%) | |
|
eXtreme Gammon Version: 2.03, MET: Kazaross XG2
If I play out the position (choosing 13/10 8/6) using Game Transcription mode, I also get the same equities as above. Can you try the analysis again in XG 2.03?