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Another issue with excluding "obvious" moves from the PR calculation

Posted By: Bob Koca
Date: Sunday, 22 January 2017, at 9:36 p.m.

In Response To: Another issue with excluding "obvious" moves from the PR calculation (Jason Lee)

From XG help

5. Decisions A decision is a checker move or a cube double that is considered non-obvious by the computer. Considered obvious are the following:

A forced moved

A move for which the best choice and the worst choice have an equity difference of less than 0.001.

A double action where the equity before doubling and after doubling is the same (optional double)

A double action where the equity before doubling is 0.200 larger than the equity after the double (obvious non double)

A double action where the equity before doubling is 0.200 larger than the equity after a drop (obvious too good to double)

A double action where the equity before and after a double is very negative (less than -0.900). This corresponds to a loss of position when trailing in the match by a lot

Are never consider as a obvious:

A double decision resulting in a double

A take decision

---

For example. The following position is not nonobvious and does not count as a decision unless you choose to double.





White is Player 2

score: 12
pip: 6
17 point match
pip: 24
score: 0

Blue is Player 1
XGID=------D--------------a-a--:2:1:1:00:0:12:0:17:10
Blue on roll, cube action?

Analyzed in Rollout No redouble Redouble/Take
Player Winning Chances: 4.17% (G:0.00% B:0.00%) 4.17% (G:0.00% B:0.00%)
Opponent Winning Chances: 95.83% (G:0.00% B:0.00%) 95.83% (G:0.00% B:0.00%)
Cubeless Equities -0.917 -0.937
Cubeful Equities
No redouble:-0.9100.000 (-0.910..-0.910)
Redouble/Take:-0.937 (-0.027)0.000 (-0.937..-0.937)
Redouble/Pass:+1.000 (+1.910)
Best Cube action: No redouble / Take
Percentage of wrong pass needed to make the double decision right: 1.4%
Rollout details
1296 Games rolled with Variance Reduction.
Moves: 3-ply, cube decisions: XG Roller
Double Decision confidence:100.0%
Take Decision confidence:100.0%
Duration: 0.2 second

eXtreme Gammon Version: 2.10, MET: Kazaross XG2

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