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Does XG's definition of PR annoy you?

Posted By: Timothy Chow
Date: Tuesday, 9 July 2024, at 3:01 p.m.

In Response To: Does XG's definition of PR annoy you? (Tenland)

Some of these suggestions seem tricky to implement. For example, I gather that you would deem the following checker play to be "not a decision":





White is Player 2

score: 0
pip: 43
7 point match
pip: 72
score: 1

Blue is Player 1
XGID=aBBBBCB-----AA--------bdd-:1:1:1:65:1:0:0:7:10
Blue to play 65

1.4-ply13/8 12/6eq: +1.000
Player:
Opponent:
84.10% (G:0.00% B:0.00%)
15.90% (G:0.00% B:0.00%)
2.4-ply13/2eq: +1.000
Player:
Opponent:
81.11% (G:0.00% B:0.00%)
18.89% (G:0.00% B:0.00%)
3.4-ply13/7 12/7eq: +1.000
Player:
Opponent:
80.38% (G:0.00% B:0.00%)
19.62% (G:0.00% B:0.00%)
4.4-ply12/1eq: +1.000
Player:
Opponent:
80.10% (G:0.00% B:0.00%)
19.90% (G:0.00% B:0.00%)
5.4-ply13/7 6/1eq: +0.274 (-0.726)
Player:
Opponent:
55.72% (G:0.00% B:0.00%)
44.28% (G:6.40% B:0.10%)

eXtreme Gammon Version: 2.19.211.pre-release, MET: Kazaross XG2

But was it a guaranteed cash post-roll? What if the roll had been 55? Let's see what XGR++ says.





White is Player 2

score: 0
pip: 43
7 point match
pip: 52
score: 1

Blue is Player 1
XGID=aBCCBCB---------------bdd-:1:1:1:00:1:0:0:7:10
Blue on roll, cube action?

Analyzed in XG Roller++ No redouble Redouble/Take
  Player Winning Chances: 79.30% (G:0.00% B:0.00%) 79.40% (G:0.00% B:0.00%)
  Opponent Winning Chances: 20.70% (G:0.00% B:0.00%) 20.60% (G:0.00% B:0.00%)
  Cubeless Equities +0.586 +1.218
Cubeful Equities
No redouble:+0.872 (-0.118)
Redouble/Take:+0.991
Redouble/Pass:+1.000 (+0.009)
 
Best Cube action: Redouble / Take

eXtreme Gammon Version: 2.19.211.pre-release, MET: Kazaross XG2

Hmmm. What about a rollout?





White is Player 2

score: 0
pip: 43
7 point match
pip: 52
score: 1

Blue is Player 1
XGID=aBCCBCB---------------bdd-:1:1:1:00:1:0:0:7:10
Blue on roll, cube action?

Analyzed in Rollout No redouble Redouble/Take
  Player Winning Chances: 79.31% (G:0.00% B:0.00%) 79.62% (G:0.00% B:0.00%)
  Opponent Winning Chances: 20.69% (G:0.00% B:0.00%) 20.38% (G:0.00% B:0.00%)
  Cubeless Equities +0.586 +1.228
Cubeful Equities
No redouble:+0.887 (-0.113)±0.003 (+0.884..+0.891)
Redouble/Take:+1.038 (+0.038)±0.006 (+1.031..+1.044)
Redouble/Pass:+1.000
 
Best Cube action: Redouble / Pass
Rollout details
1296 Games rolled with Variance Reduction.
Dice Seed: 62908879
Moves and cube decisions: XG Roller++
Search interval: Gigantic
 
Double Decision confidence:100.0%
Take Decision confidence:100.0%
Duration: 4 minutes 33 seconds

eXtreme Gammon Version: 2.19.211.pre-release, MET: Kazaross XG2

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