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Be alert *RO*

Posted By: eXtreme Gammon
Date: Friday, 12 August 2011, at 1:05 p.m.

In Response To: Be alert *RO* (Bob Koca)

The difference comes from VR and the fact the opponent plays differently depending if you play 2/1 or 1/off. a 4-ply RO still gives a 0.0001 difference (in favor of 4/2 1/off)

Bob: a bear off database going to the 22nd point will huge: 9,364,199,760 positions, for an esitmated size of 385 GB (compressed!) and it will take allmost a year to generate and will require 1 TB of Hard drive space!

About the BO db: my tests show it is not practical to read from the file during the analyze (i.e. VERY slow, even if the db is on a SSD). in XG2 you can load the Bo Db up to the 11 point in memory. If you have generated the 12 or 13 point one, it is used to display EPC but not for analyze.

btw, tests show allmost no difference (+0.002 PR) in strength with or without the BO db loaded in memory. It can speed up RO a little bit.

just in case people wonder: i will not bother to fix that: 0.0003 equity errors are not top priority :)

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