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Proper backgame technique?

Posted By: Daniel Murphy
Date: Tuesday, 20 May 2008, at 3:08 a.m.

In Response To: Proper backgame technique? (PersianLord)

The two positions diagrammed above are around move number 57 in the Snowie analysis of the very long game.

Unlike Gnubg, at least Snowie "knows" that the game's about 50-50 in those two positions. Also, later in the game (Snowie move Green 121):

DMP. Blue to play 3-4

yeti_yew175


2X1X1X3X ' ' ' ' ' ' '1X

1X ' '2X2X2X2O '3O4O4O2O

PersianLord149

Position ID: wNx7AwCrAwRsIw Match ID: MIExAAAAAAAA

• yeti_yew moves 12/5

... Snowie 1-ply plays 20/17 21/17.

Alert: bad move ( -0.039)

Alert: unlucky roll! ( +0.002)

# Ply Move Equity
1 4 24/17 -0.283
0.358 0.073 0.001 - 0.642 0.158 0.001
2 4 21/17 12/9 -0.305 ( -0.022)
0.347 0.067 0.001 - 0.653 0.169 0.002
3 4 24/21 12/8 -0.318 ( -0.035)
0.341 0.066 0.001 - 0.659 0.166 0.001
4 4 24/20 12/9 -0.319 ( -0.036)
0.340 0.066 0.001 - 0.660 0.161 0.001
5 4 12/5 -0.323 ( -0.039)
0.339 0.067 0.001 - 0.661 0.170 0.001
6 4 20/17 12/8 -0.366 ( -0.083)
0.317 0.061 0.001 - 0.683 0.204 0.003
7 4 21/17 4/1 -0.368 ( -0.085)
0.316 0.052 0.000 - 0.684 0.184 0.002
8 4 21/17 20/17 -0.374 ( -0.090)
0.313 0.066 0.001 - 0.687 0.186 0.006


Annotation
1. Cubeful 0-ply 24/20 12/9 Eq.: -0.233

0.383 0.081 0.001 - 0.617 0.129 0.001

0-ply cubeful prune [expert]

10. Cubeful 0-ply 21/17 20/17 Eq.: -0.418 ( -0.185)

0.291 0.059 0.001 - 0.709 0.212 0.008

0-ply cubeful prune [expert]

1. Cubeful 1-ply 24/21 12/8 Eq.: -0.501

0.250 0.040 0.001 - 0.750 0.189 0.002

1-ply cubeful prune

4. Cubeful 1-ply 21/17 20/17 Eq.: -0.542 ( -0.042)

0.229 0.051 0.001 - 0.771 0.196 0.007

1-ply cubeful prune

1. Cubeful 2-ply 24/17 Eq.: -0.233

0.383 0.079 0.001 - 0.617 0.147 0.001

2-ply cubeful prune [world class]

10. Cubeful 2-ply 21/17 20/17 Eq.: -0.396 ( -0.162)

0.302 0.063 0.001 - 0.698 0.202 0.007

2-ply cubeful prune [world class]

1. Cubeful 3-ply 24/17 Eq.: -0.480

0.260 0.059 0.001 - 0.740 0.208 0.003

3-ply cubeful prune [grandmaster]

7. Cubeful 3-ply 21/17 20/17 Eq.: -0.541 ( -0.061)

0.230 0.051 0.001 - 0.770 0.214 0.008

3-ply cubeful prune [grandmaster]

1. Cubeful 4-ply 24/17 Eq.: -0.283

0.358 0.073 0.001 - 0.642 0.158 0.001

4-ply cubeful prune

8. Cubeful 4-ply 21/17 20/17 Eq.: -0.374 ( -0.090)

0.313 0.066 0.001 - 0.687 0.186 0.006

4-ply cubeful prune

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