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OTB, XGR+ evals, and comments

Posted By: Timothy Chow
Date: Thursday, 12 April 2012, at 2:56 p.m.

In Response To: Some interesting decisions from MCG-Wells vs Olsen-Kristensen (Timothy Chow)

MCG is right that I messed up the score in Position 3; in real life, White led 2-1. I blame apbg.net. For some reason, when I pasted in the GNU ID, it often got the score and the dice wrong. I went back and tried to fix all the mistakes manually, but evidently I missed one.


OTB, Blue played 13/2. While watching, I thought 6/1* was an alternative. The plays seem to be close.





White is Player 2

score: 1
pip: 149
9 point match
pip: 132
score: 0

Blue is Player 1
XGID=-a-B-aD-C---bFab-b-cba----:0:0:1:65:0:1:0:9:16
Blue to play 65

1.XG Roller+13/7 6/1* eq: +0.194
Player:
Opponent:
55.84% (G:12.25% B:0.52%)
44.16% (G:12.48% B:0.41%)
2.XG Roller+13/2eq: +0.170 (-0.024)
Player:
Opponent:
56.02% (G:11.24% B:0.43%)
43.98% (G:12.12% B:0.34%)
3.XG Roller+13/8 13/7eq: +0.142 (-0.052)
Player:
Opponent:
53.64% (G:13.33% B:0.69%)
46.36% (G:12.25% B:0.36%)

eXtreme Gammon Version: 1.21, MET: Rockwell-Kazaross


OTB Blue at first wanted to run but ultimately played 6/1 4/1. This is the DMP play but it gets gammoned more often.





White is Player 2

score: 0
pip: 54
9 point match
pip: 91
score: 1

Blue is Player 1
XGID=-BBCCBA------------cc-cfB-:1:1:1:53:1:0:0:9:16
Blue to play 53

1.XG Roller+24/16eq: -0.766
Player:
Opponent:
11.80% (G:0.00% B:0.00%)
88.20% (G:3.64% B:0.04%)
2.XG Roller+6/1 4/1eq: -0.810 (-0.043)
Player:
Opponent:
12.20% (G:0.00% B:0.00%)
87.80% (G:8.06% B:0.20%)

eXtreme Gammon Version: 1.21, MET: Rockwell-Kazaross


OTB Blue played safe, which is probably what I would have done as well. Again there's a tricky win/gammon tradeoff to consider. I think hitting still comes out ahead at 8a7a.





White is Player 2

score: 2
pip: 136
9 point match
pip: 161
score: 0

Blue is Player 1
XGID=----A-D-Da--dDb--b-bbb--AA:1:1:1:41:0:2:0:9:16
Blue to play 41

1.XG Roller+Bar/24 13/9* eq: -0.523
Player:
Opponent:
26.92% (G:5.13% B:0.19%)
73.08% (G:23.28% B:1.95%)
2.XG Roller+Bar/24 8/4eq: -0.606 (-0.083)
Player:
Opponent:
20.61% (G:2.48% B:0.06%)
79.39% (G:13.27% B:0.57%)

eXtreme Gammon Version: 1.21, MET: Rockwell-Kazaross


OTB Blue rolled the dice pretty quickly here without doubling, which I found surprising. I guess they thought they were TG.





White is Player 2

score: 1
pip: 117
9 point match
pip: 106
score: 4

Blue is Player 1
XGID=aB-A-BCCB---b-a--bBda-bb--:0:0:1:00:4:1:0:9:16
Blue on roll, cube action?


Analyzed in XG Roller+
Player Winning Chances: 74.03% (G: 37.71% B: 0.82%)
Opponent Winning Chances: 25.97% (G: 5.85% B: 0.27%)
Cubeless Equities
No Double:+0.799
Double:+1.597
Cubeful Equities
No Double:+0.866 (-0.134)
Double/Take:+1.272 (+0.272)
Double/Drop:+1.000
Best Cube action: Double / Drop

eXtreme Gammon Version: 1.21, MET: Rockwell-Kazaross


OTB Blue played 13/7. Maybe this is an obvious decision to some but it wasn't obvious to me while I was watching.





White is Player 2

score: 1
pip: 150
9 point match
pip: 146
score: 7

Blue is Player 1
XGID=-b-B--D-B-A-bEa-bb-cb-a--A:0:0:1:62:7:1:0:9:16
Blue to play 62

1.XG Roller+Bar/23 13/7eq: -0.666
Player:
Opponent:
43.21% (G:13.56% B:0.99%)
56.79% (G:20.84% B:1.07%)
2.XG Roller+Bar/23 10/4eq: -0.759 (-0.093)
Player:
Opponent:
42.56% (G:12.26% B:0.90%)
57.44% (G:23.39% B:0.95%)

eXtreme Gammon Version: 1.21, MET: Rockwell-Kazaross


OTB Blue thought for a long time about 13/12* versus 6/5* and ultimately settled on 6/5*. Falafel challenged them after the game, expressing amazement that they didn't play 13/12*.





White is Player 2

score: 1
pip: 125
9 point match
pip: 123
score: 7

Blue is Player 1
XGID=-BBB-aCa----aBC-bb-bdb---A:1:1:1:31:7:1:0:9:16
Blue to play 31

1.XG Roller+Bar/22 13/12* eq: -0.267
Player:
Opponent:
49.81% (G:20.84% B:0.75%)
50.19% (G:18.77% B:1.15%)
2.XG Roller+Bar/22 6/5* eq: -0.308 (-0.041)
Player:
Opponent:
50.27% (G:27.91% B:1.50%)
49.73% (G:22.45% B:1.30%)
3.XG Roller+Bar/22 14/13eq: -0.576 (-0.309)
Player:
Opponent:
37.45% (G:12.20% B:0.44%)
62.55% (G:24.05% B:0.76%)

eXtreme Gammon Version: 1.21, MET: Rockwell-Kazaross


OTB this went D/T. Blue may have had a technical double a roll or two earlier but the take would have been trivial. Here it might also seem at first glance that the take is easy but it isn't. I wouldn't be shocked if a rollout declared this to be a close drop.





White is Player 2

score: 7
pip: 136
9 point match
pip: 131
score: 3

Blue is Player 1
XGID=-c--CCC----B-C-aaa-bbbab-A:0:0:1:00:3:7:0:9:16
Blue on roll, cube action?


Analyzed in XG Roller+
Player Winning Chances: 57.87% (G: 25.28% B: 3.79%)
Opponent Winning Chances: 42.13% (G: 17.91% B: 0.45%)
Cubeless Equities
No Double:+0.175
Double:+0.944
Cubeful Equities
No Double:+0.595 (-0.349)
Double/Take:+0.944
Double/Drop:+1.000 (+0.056)
Best Cube action: Double / Take

eXtreme Gammon Version: 1.21, MET: Rockwell-Kazaross

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