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eXtreme Backgammon

Posted By: Michael Depreli
Date: Monday, 7 July 2014, at 10:51 a.m.

In Response To: eXtreme Backgammon (Ian Dunstan)

XGRoller The XG Roller levels setting relies on truncated rollouts to estimate the position. This has been proven to be an extremely efficient way to analyze a position. For instance a level like XGRoller+ is much stronger but faster than a 5-ply analysis.

Here are the settings used for the different levels of XGRoller

XGRoller 42 Games using VR with rotation on 21 dice Truncated after 5 moves using 1-ply All decisions in 1-ply

XGRoller+ 360 games with VR Truncated after 7 moves using 2-ply Stop when reaching 0.010 Confidence (minimum 180 games) First 2 decision in 2-ply Then 1-ply checker and 2-ply cube

XGRoller++ Checker 360 games with VR Truncated after 5 moves using 3-ply First 2 decisions in 3-ply Then 2-ply checker and 3-ply cube

XGRoller++ Cube 360 games with VR Truncated after 7 moves using 3-ply Stop when reaching 0.010 Confidence (minimum 180 games) First 2 decisions in 3-ply Then 2-ply checker and 3-ply cube

Yes it plays backgames very well but no doubt can be improved.

I've seen instances of the odd / even effect but it's nothing like gnuBG suffered from and it's effect is only small.

I think one of the main areas of improvement for the next version is containment play

Michael

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