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Memorizing reference positions

Posted By: Stick
Date: Sunday, 17 February 2013, at 3:19 p.m.

In Response To: Memorizing reference positions (christian munk-christensen)

How well do you actually know those positions? Do you know the equity, win rate, gammon rate for all of those positions? Or do you just know the correct play?

I know the equity for very few of these positions. Offhand I'd figure I know the equity for the holding games and early game blitz reference positions but not the rest for the most part. I know the win/gammon breakdown for a good amount of them and the correct decision for all where it's what I'm concerned with. It seems like you discount a reference position if you 'just' know the correct play whereas I find, esp. in the early game, that knowing one position is highly applicable to another. An easy example is how do you play a 54 after an opening 61 by your opponent?





White is Player 2

score: 0
pip: 160
Unlimited Game
Jacoby Beaver
pip: 167
score: 0

Blue is Player 1
XGID=-b----E-C---dE---bbe----B-:0:0:1:54:0:0:3:0:10
Blue to play 54
1.Book124/20 13/8eq: -0.229
Player:
Opponent:
44.86% (G:11.31% B:0.65%)
55.14% (G:16.20% B:0.86%)
Conf.: ± 0.004 (-0.233...-0.226) - [92.3%]
2.Book124/15eq: -0.233 (-0.004)
Player:
Opponent:
44.97% (G:10.25% B:0.55%)
55.03% (G:16.55% B:0.83%)
Conf.: ± 0.004 (-0.237...-0.229) - [7.7%]
1 Generated by David Rockwell on 6/6/2010 using eXtreme Gammon 1.14
46656 Games rolled with Variance Reduction.
Dice Seed: 74780549
Moves and cube decisions: 3-ply

I know going in that the two plays are very close and that splitting is ever so slightly ahead according to rollouts. That means when this position comes up: (31P-61P-54)





White is Player 2

score: 0
pip: 160
Unlimited Game
Jacoby Beaver
pip: 163
score: 0

Blue is Player 1
XGID=-b---BD-B---dE---bbe----B-:0:0:1:54:0:0:3:0:10
Blue to play 54
1.XG Roller+24/20 13/8eq: +0.208
Player:
Opponent:
54.72% (G:16.39% B:0.86%)
45.28% (G:11.72% B:0.46%)
2.XG Roller+24/15eq: +0.148 (-0.060)
Player:
Opponent:
54.03% (G:14.18% B:0.64%)
45.97% (G:12.05% B:0.45%)

I would have no issue figuring out the best play thanks to the second roll position. I avoid possibly making a rather big mistake thanks to the simple reference position.

Stick

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