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Opening rollout question for Nack and Stick...Jacoby Rule or not?

Posted By: Nack Ballard
Date: Tuesday, 12 January 2010, at 1:13 a.m.

In Response To: Opening rollout question for Nack and Stick...Jacoby Rule or not? (neilkaz)

There are lots of GNU and Snowie opening and response rollouts posted here. Was the Jacoby Rule used for the money play RO's?

When I am doing my XG 4 ply RO's for money I left Jacoby Rule on, since that is XG default and also the way almost all money play is played.

That's fine. We leave Jacoby on as well. Money is pure in that respect, and match play can be all over the place at different scores, so to me it makes sense to use money Jacoby as a base for money-like match play.

While you can find positions in which it makes a big difference, years ago Doug Zare told me that it seemed to make very little difference overall when he compared the results/performance of two Z-bots, one Jacoby and one non-Jacoby. (For further details, ask him.) And it makes even less difference for second roll and most third and fourth roll plays, where cube effects are more distant on average.

64P-62S-11 was one the first corrupt Gnu rollouts I discovered (out of dozens, so far, I'm sorry to say). Stick posted that rollout here on the forum in the hopes that someone would be able to isolate the problem. (Not much luck yet, except that we know certain old Gnu versions are a lot more likely to cause corruptions than others.) That post is buried somewhere in the archives.

Anyway, in the process, Stick and Matt C. did several rollouts of that position (64P-62S-11. Using same seed as each other (and both with version 0.90.0 ming), Stick got .4303 for the A play (6/5(2) 2/1*(2)) Jacoby, and Matt got .4366 no Jacoby. Using a different seed but again the same seeds as each other, Stick got .4322 Jacoby and Matt got .4376 no Jacoby. While .0063 or .0054 is a substantial difference for a third roll position, the fact that double 1s is a strong roll and hits while forming a three-point board with another blot to go after brings the cube into play a lot more than in the positions you are rolling out.

Stick called Matt a donkey for using no Jacoby, the first time I was aware of equinimity in the assence of their relationship, as each tries to emule-ate the other. Is that where it all started?

Nack

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