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Rollout statistics -- XG 2.19 feature

Posted By: Jason Lee
Date: Sunday, 29 June 2025, at 12:54 p.m.

XG version 2.19 has a feature that Tim Chow has been asking for: rollout stats.

I posted this position:





White is Professional

score: 6
pip: 97
9 point match
pip: 132
score: 2

Blue is Hive Mind
XGID=--ABBABAA--b-Ba--bBcbcA-b-:1:1:1:31:2:6:0:9:10
Blue to play 31

1.Rollout118/14* eq: -0.451
Player:
Opponent:		25.41% (G:6.92% B:0.41%)
74.59% (G:61.66% B:12.98%)		Conf.: ± 0.009 (-0.460...-0.442) - [100.0%]
Duration: 21 minutes 34 seconds
2.playedRollout18/5 7/6eq: -0.488 (-0.037)
Player:
Opponent:		23.74% (G:3.80% B:0.18%)
76.26% (G:26.07% B:0.55%)		Conf.: ± 0.007 (-0.494...-0.481) - [0.0%]
Duration: 20 minutes 49 seconds
1 1296 Games rolled with Variance Reduction.
Moves: 4-ply, cube decisions: XG Roller+
Search interval: Huge

eXtreme Gammon Version: 2.19.211.pre-release, MET: Kazaross XG2

UBK wrote: "At score looks like it would be an efficient cube after hit and dance. Got to go for that immediate 1/4 chance. Gammon value for opponent on two cube is low. Definitely 18/14* for me."

I suspect this is a position where rollout stats could be illuminating:

That's actually four separate images stitched together. The top two show the rollout stats for the top two moves using number of games (out of 1296), and the bottom two show the same data, but by percentages.

My question: do the rollout statistics help support Bob's read on the position? If so, how do see that in the data?

JLee

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