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BGonline.org Forums
Understanding the score *SPOILER*
Posted By: Karol Szczerek In Response To: Understanding the score (John O'Hagan)
Date: Saturday, 10 March 2018, at 9:45 a.m.
Dear reader, below I post some hints for solving the original position, so if you still want to quiz yourself, don't scroll down.
In search of answers I've constructed 3 positions which are similar in win/gamm ratios for the leader but they vary in terms of bg chances. In the first one, which is a slightly modified original position, bgs are so high it's incorrect to redouble even though the eq is close to 1. In the second one the bg chance is lower and it's correct to redouble now, although it's not a big gain in eq. In the third one there are no bgs and it's a whopper not to redouble. Turns out the bgs factor looks like the most important one. By redoubling we kill all our bgs.
White is Player 2
score: 0
pip: 1628 point match pip: 52
score: 0
Blue is Player 1XGID=--B-BBC------a--AAAcd--BbA:1:-1:-1:00:0:0:0:8:10 Blue on roll, cube action?
Analyzed in XG Roller++ No redouble Redouble/Take Player Winning Chances: 61,84% (G:45,65% B:8,96%) 61,12% (G:44,92% B:11,19%) Opponent Winning Chances: 38,16% (G:0,00% B:0,00%) 38,88% (G:0,00% B:0,00%) Cubeless Equities +0,844 +1,451 Cubeful Equities No redouble: +0,914 Redouble/Take: +0,855 (-0,059) Redouble/Pass: +1,000 (+0,086) Best Cube action: No redouble / Take Percentage of wrong pass needed to make the double decision right: 28,9% eXtreme Gammon Version: 2.10, MET: Kazaross XG2
White is Player 2
score: 0
pip: 1518 point match pip: 132
score: 0
Blue is Player 1XGID=---aaBBABBAAbB-aab-cAAbb--:1:-1:-1:00:0:0:0:8:10 Blue on roll, cube action?
Analyzed in XG Roller++ No redouble Redouble/Take Player Winning Chances: 60,97% (G:43,89% B:7,40%) 60,97% (G:43,92% B:7,10%) Opponent Winning Chances: 39,03% (G:9,38% B:0,59%) 39,03% (G:9,49% B:0,58%) Cubeless Equities +0,679 +1,216 Cubeful Equities No redouble: +0,784 (-0,064) Redouble/Take: +0,848 Redouble/Pass: +1,000 (+0,152) Best Cube action: Redouble / Take eXtreme Gammon Version: 2.10, MET: Kazaross XG2
White is Player 2
score: 0
pip: 1508 point match pip: 51
score: 0
Blue is Player 1XGID=-DDBCA-aa---cb--Abbbb-----:1:1:1:00:0:0:0:8:10 Blue on roll, cube action?
Analyzed in XG Roller++ No redouble Redouble/Take Player Winning Chances: 61,90% (G:45,95% B:0,01%) 61,89% (G:46,97% B:0,01%) Opponent Winning Chances: 38,10% (G:2,77% B:0,05%) 38,11% (G:2,68% B:0,05%) Cubeless Equities +0,718 +1,470 Cubeful Equities No redouble: +0,755 (-0,152) Redouble/Take: +0,907 Redouble/Pass: +1,000 (+0,093) Best Cube action: Redouble / Take eXtreme Gammon Version: 2.10, MET: Kazaross XG2
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