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XG++ verses rollouts

Posted By: Chuck Bower
Date: Wednesday, 29 March 2017, at 1:46 p.m.

In Response To: XG++ verses rollouts (bluedice)

...there was a small difference...

Having had to unlearn more backgammon than many ever learn in the first place (still doing it) I don't want to go back to the 70's and learn bad habits.

If I understand your ASCII result, the book (XG++ mini-rollout) said borderline pass/take -- i.e. no cost for passing. Your rollout says 0.90 Take, and thus an 0.10 error to pass this cube.

I don't consider that "small". I'm not here to dump on a new book, particularly one at the advanced/expert level -- those only seem to come out every 5+ years. Hopefully someone (author or otherwise, and possibly a group effort) will roll out all positions and make the results available.

I've defended Robertie's Advanced Backgammon for going on decades now. There are many positions with bad cube action recommendations, but the principles detailed there are still valuable. When he wrote those (even the revised 2 volumes released in 1991), TD-Gammon was just being developed/polished and it was effectively a proprietary, experiemental prototype. The first true commercial bot, Jellyfish, was 5 years in the future. So Robertie gets a pass (no pun intended) with that book. Anything since 1996 should have full rollouts on all cube decisions, and for completeness (and to give the buyers' their money's worth), so should checkerplay positions.

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