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Variable MET design

Posted By: Ian Dunstan
Date: Thursday, 14 February 2019, at 10:20 a.m.

In Response To: Variable MET design (Albert Steg)

Is 28.5% the percentage of money ('unlimited') games you would expect to end in a gammon or backgammon for either player, without the Jacoby rule in effect?

I think it likely that a more skillful player will usually achieve a higher g+bg rate in their games (matches or money) than a weaker player would. I made up 28.5% (no Jacoby) as an example. I do not know how close this figure is, however, I would be surprised if XGR++ rollouts did not achieve a higher g+bg rate than the 3-ply ~60K trials that gave me 28.35%

What % of gammons do people suspect are prevented by the Jacoby rule? In other words, what % of games in actual traditional money play with Jacoby in effect end in a g/bg one way or the other?

The Jacoby rule has little effect on the rollouts of the opening position. Example, using the same seed in Gnubg:

0-ply Jacoby 5184 trials

Result: g+bg = 27.301%

0-ply No Jacoby 5184 trials

Result: g+bg = 27.332%

However, I have done all my money trials without Jacoby.

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