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Impact of Jacoby rule on checker play

Posted By: Daniel Murphy
Date: Friday, 1 October 2010, at 1:24 a.m.

In Response To: Impact of Jacoby rule on checker play (Timothy Chow)

I can't say much backed with evidence on the impact of the Jacoby rule on checker play although I think the effect is small. But I can say that I believe the impact of the rule on cube action is often greatly overestimated.

In 2007 someone in the Danish forum had suggested that adding the Jacoby rule would surely shorten matches and lead to much earlier doubling. But I had a file of Gnubg 2-ply playing itself in 1,000 money games. Only 2.2% of the games were gammons or backgammons with the cube on one. In 97.6% of all games the cube was turned. 30.3% of all games ended with double/drop.

[In a sampling of those games] in only 2-3% of them did a player go from "no double" to "too good," and in only 2-3% of them from "too good" to a Jacoby "double/pass." I concluded that only about 4-5% of money games would have been shorter with the Jacoby rule in effect. In match play the effect must be even smaller since at so many scores the Jacoby rule has negligible or no meaning (Crawford, post-Crawford, DMP, 2-away 2-away, etc.)

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