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How does XG+ get this bearoff cube so wrong?

Posted By: eXtreme Gammon
Date: Thursday, 30 May 2013, at 8:28 p.m.

In Response To: How does XG+ get this bearoff cube so wrong? (Bob Koca)

Thanks Bob,

This is a bug in the 2-ply and VR that will happens only if the position is not in the BO db and if the second player has chances to win on the next roll.

in the cubeless to cubeful convert I've a sanity check to verify that the converted equity is never lower than the equity resulting from winning immediately as the opponent will never use the cube. the 2-ply evaluation does not verify that (you will see on the position that the 2-ply is very off). as a result the sum of the luck of all roll did not add up to 0 and thus skewing the results.

The position its affects are quite rare. I got that fixed for the next update.

Thanks for positing the position

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