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Simple Wisecarver positions

Posted By: Ray Kershaw
Date: Tuesday, 20 June 2017, at 7:01 a.m.

In response to Timothy Chow's request to see Wisecarver (cube provocation) positions with a substantial difference in the roller's equity where the correct play results in a correct redouble and the wrong play does not, Tom Keith gave two positions

http://www.bgonline.org/forums/webbbs_config.pl?read=201103

The first position is easy to explain





White is Player 2

score: 0
pip: 7
Unlimited Game
Jacoby Beaver
pip: 14
score: 0

Blue is Player 1
XGID=---A-AA-------------a--a--:1:-1:1:64:0:0:3:0:10
Blue to play 64

1.XG Roller++6/Off 5/1eq: -0.111
Player:
Opponent:		44.62% (G:0.00% B:0.00%)
55.38% (G:0.00% B:0.00%)
2.XG Roller++6/2 5/Offeq: -0.344 (-0.233)
Player:
Opponent:		32.89% (G:0.00% B:0.00%)
67.11% (G:0.00% B:0.00%)

eXtreme Gammon Version: 2.19.208.pre-release

The wrong play results in one of the five Jacoby Paradox positions where White does not redouble to 4 because that would give Blue a strong redouble to 8 when White misses.

Apart from positions which can be analysed via the Jacoby Paradox, it is very very difficult to analyse a cube provocation position even with very few checkers on the board.

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