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xg vs gnubg containment position

Posted By: eXtreme Gammon
Date: Thursday, 31 July 2014, at 5:20 p.m.

In Response To: xg vs gnubg containment position (Ian Dunstan)

There is a difference between GnuBG cubeless RO and XG's.

In GnuBG it basically assume the cube cannot be turn and will play checker play accordingly.

In XG, it knows the cube can be used and will play the checker accordingly, but it will never double.

To make a comparison you need to set the position (not the RO) as cubeless via the menu "setup>>Maximum cube value>>cubeless", then you can pick any RO setting you want.





White is Player 2

score: 0
pip: 158
Unlimited Game
pip: 72
score: 0

Blue is Player 1
XGID=bEDD----------bbbbbc---AA-:0:0:-1:65:0:0:0:0:0
White to play 65

1.Rollout1Bar/20 Bar/19eq: +0.771
Player:
Opponent:
79.57% (G:22.27% B:0.86%)
20.43% (G:5.09% B:0.03%)
Conf.: 0.027 (+0.744...+0.799)
Duration: 3 minutes 10 seconds
1 1296 Games rolled with Variance Reduction.
Moves: 3-ply, cube decisions: XG Roller

eXtreme Gammon Version: 2.19.206.pre-release

As containment is surely a weakness of XG2 here is a RO with the verison 3 engine that is in development





White is Player 2

score: 0
pip: 158
Unlimited Game
pip: 72
score: 0

Blue is Player 1
XGID=bEDD----------bbbbbc---AA-:0:0:-1:65:0:0:0:0:0
White to play 65

1.Rollout1Bar/20 Bar/19eq: +0.815
Player:
Opponent:
80.95% (G:23.21% B:0.82%)
19.05% (G:4.45% B:0.01%)
Conf.: 0.019 (+0.796...+0.834)
Duration: 2 minutes 30 seconds
1 1296 Games rolled with Variance Reduction.
Moves: 3-ply, cube decisions: XG Roller

eXtreme Gammon Version: 3 alpha

It is interesting to see the CI went down significantly, showing the new engine has a much better idea of how to handle these positions

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