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Free Lesson - 5a 5a

Posted By: Taper_Mike
Date: Tuesday, 4 September 2012, at 1:15 p.m.

In Response To: Free Lesson - 5a 5a (Stick)

Thanks for treating us to another great lesson.

After the late hit in one game, XG had borne off 6 checkers, and you faced the job of containing the hit checker. You will remember that a tough 33 caused one of the largest errors in the lesson.

After hitting loose on the 3pt, you remarked how the need to cover sometimes conflicts with the desire to beat the gammon. Bringing extra checkers within direct range gives you more chances to make the point, but also creates more double-hit opportunities for your opponent. Eventually you chose to play 19/16, 13/10(2), 6/3*, leaving only the roll 53 as double-hit number. (See diagram below.) Somewhat surprisingly, that move ranks 12th in the rollout below.

Nevertheless, the short rollout seems to indicate that you were on the right track. The reason your play ranks so low is evidentally because it brought only one checker within direct range to cover. The best play brings two, while limiting the risk of a double hit to the same chances as your move. The quickest way to win this game is to cover.

Any more exact explanation probably involves counting the hits and covers (and wins and gammons) for each candidate.

Mike






White is Player 2

score: 0
pip: 37
5 point match
pip: 127
score: 0

Blue is Player 1
XGID=--BaBBC-A----C-----A-Abcc-:0:0:1:33:0:0:0:5:10
Blue to play 33

1.Rollout113/7 8/5 6/3* eq: -0.021
Player:
Opponent:
54.63% (G:0.00% B:0.00%)
45.37% (G:19.01% B:0.93%)
Conf.: ± 0.008 (-0.029...-0.013) - [99.4%]
Duration: 6 minutes 56 seconds
2.Rollout119/16 13/10 8/5 6/3* eq: -0.035 (-0.014)
Player:
Opponent:
53.66% (G:0.00% B:0.00%)
46.34% (G:18.51% B:0.88%)
Conf.: ± 0.007 (-0.042...-0.028) - [0.6%]
Duration: 6 minutes 28 seconds
3.Rollout121/15 13/10 6/3* eq: -0.041 (-0.019)
Player:
Opponent:
53.37% (G:0.00% B:0.00%)
46.63% (G:19.37% B:1.18%)
Conf.: ± 0.007 (-0.048...-0.033) - [0.0%]
Duration: 7 minutes 27 seconds
4.Rollout113/4 6/3* eq: -0.041 (-0.020)
Player:
Opponent:
53.70% (G:0.00% B:0.00%)
46.30% (G:18.57% B:0.95%)
Conf.: ± 0.008 (-0.049...-0.034) - [0.0%]
Duration: 6 minutes 23 seconds
5.Rollout121/18 13/10 8/5 6/3* eq: -0.047 (-0.026)
Player:
Opponent:
53.50% (G:0.00% B:0.00%)
46.50% (G:18.50% B:0.62%)
Conf.: ± 0.007 (-0.055...-0.040) - [0.0%]
Duration: 6 minutes 06 seconds
6.Rollout121/18 19/16 13/10 6/3* eq: -0.052 (-0.031)
Player:
Opponent:
52.94% (G:0.00% B:0.00%)
47.06% (G:19.78% B:1.14%)
Conf.: ± 0.007 (-0.059...-0.044) - [0.0%]
Duration: 6 minutes 19 seconds
7.Rollout113/10(2) 8/5 6/3* eq: -0.061 (-0.039)
Player:
Opponent:
53.10% (G:0.00% B:0.00%)
46.90% (G:19.08% B:0.99%)
Conf.: ± 0.008 (-0.069...-0.053) - [0.0%]
Duration: 5 minutes 19 seconds
8.Rollout119/16 13/7 6/3* eq: -0.066 (-0.045)
Player:
Opponent:
53.21% (G:0.00% B:0.00%)
46.79% (G:20.90% B:1.36%)
Conf.: ± 0.008 (-0.074...-0.058) - [0.0%]
Duration: 5 minutes 59 seconds
9.Rollout119/10 6/3* eq: -0.068 (-0.047)
Player:
Opponent:
53.01% (G:0.00% B:0.00%)
46.99% (G:20.10% B:0.78%)
Conf.: ± 0.008 (-0.076...-0.060) - [0.0%]
Duration: 5 minutes 46 seconds
10.Rollout121/18 13/10(2) 6/3* eq: -0.068 (-0.047)
Player:
Opponent:
52.77% (G:0.00% B:0.00%)
47.23% (G:20.17% B:1.47%)
Conf.: ± 0.008 (-0.076...-0.060) - [0.0%]
Duration: 5 minutes 32 seconds
11.Rollout121/18 13/7 6/3* eq: -0.070 (-0.049)
Player:
Opponent:
53.05% (G:0.00% B:0.00%)
46.95% (G:20.95% B:1.15%)
Conf.: ± 0.008 (-0.078...-0.062) - [0.0%]
Duration: 6 minutes 15 seconds
12.Rollout119/16 13/10(2) 6/3* eq: -0.071 (-0.049)
Player:
Opponent:
52.61% (G:0.00% B:0.00%)
47.39% (G:20.50% B:1.57%)
Conf.: ± 0.008 (-0.079...-0.063) - [0.0%]
Duration: 5 minutes 17 seconds
13.Rollout121/15 19/16 6/3* eq: -0.083 (-0.062)
Player:
Opponent:
51.78% (G:0.00% B:0.00%)
48.22% (G:21.07% B:0.78%)
Conf.: ± 0.007 (-0.090...-0.076) - [0.0%]
Duration: 5 minutes 53 seconds
14.Rollout121/12 6/3* eq: -0.085 (-0.063)
Player:
Opponent:
52.12% (G:0.00% B:0.00%)
47.88% (G:20.70% B:0.79%)
Conf.: ± 0.008 (-0.093...-0.077) - [0.0%]
Duration: 5 minutes 22 seconds
15.Rollout113/10 13/7 6/3* eq: -0.089 (-0.068)
Player:
Opponent:
53.01% (G:0.00% B:0.00%)
46.99% (G:22.37% B:3.40%)
Conf.: ± 0.008 (-0.097...-0.081) - [0.0%]
Duration: 4 minutes 55 seconds
16.Rollout121/15 8/5 6/3* eq: -0.099 (-0.078)
Player:
Opponent:
51.82% (G:0.00% B:0.00%)
48.18% (G:20.25% B:0.57%)
Conf.: ± 0.007 (-0.106...-0.092) - [0.0%]
Duration: 4 minutes 56 seconds
1 1296 Games rolled with Variance Reduction.
Dice Seed: 64559963
Moves: 3-ply, cube decisions: XG Roller

eXtreme Gammon Version: 2.03, MET: Kazaross XG2

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