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Nactation question 02

Posted By: Taper_Mike
Date: Friday, 25 November 2011, at 11:27 a.m.

In Response To: Nactation question 02 (Mochy)

Mochy,

I hope this helps. In the nacbracs below, double quote (") means XG2, circumflex (^) means XG 4-ply, and lower case e means "eval." Thus, "^e is an XG2 4-ply eval.

64S-66B-53 [C Z48 c51 E55 U60] "^e

Mike
White is Player 2

score: 0
pip: 143
Unlimited Game
Jacoby Beaver
pip: 164
score: 0

Blue is Player 1
XGID=------EbCA--cD---cbe----AA:0:0:1:35:0:0:3:0:10
Blue to play 35

1.4-plyBar/22 9/4eq: -0.567
Player:
Opponent:		35.50% (G:6.86% B:0.19%)
64.50% (G:17.21% B:0.58%)
2.4-plyBar/22 13/8eq: -0.615 (-0.048)
Player:
Opponent:		34.37% (G:6.65% B:0.18%)
65.63% (G:17.82% B:0.71%)
3.4-plyBar/20 8/5eq: -0.618 (-0.051)
Player:
Opponent:		34.99% (G:7.02% B:0.22%)
65.01% (G:19.39% B:0.90%)
4.4-plyBar/20 6/3eq: -0.622 (-0.055)
Player:
Opponent:		34.82% (G:6.72% B:0.21%)
65.18% (G:18.97% B:0.86%)
5.4-plyBar/20 24/21eq: -0.627 (-0.060)
Player:
Opponent:		34.55% (G:5.66% B:0.18%)
65.45% (G:17.79% B:0.67%)

eXtreme Gammon Version: 2.00

The C (Cross) Family
Play Far Down Jump Inside Hits on
These Points
(more is better)
(higher is better)		 Owned Points Not Held
by All Members in Family
(more is better)
(closer to 6pt is better)		 Blot and Spare
Destinations
(closer to 6pt is better)
(outer board: farther is better)		 Nactation
bar/20, 9/6 bar/20 9/6 6pt* 20pt C
bar/20, 8/5 bar/20 8/5 5pt* 20pt c
bar/22, 9/4 bar/22 9/4 4pt* 22pt C
bar/22, 8/3 bar/22 8/3 3pt* 22pt c

*This is the deciding criterion.

In the C (Cross) family, there are no hitting plays, and no plays that make (or surrender) any points. The entire family is ranked based solely on the destinations of blots and spares.

When comparing blots and spares, only the checkers that are moved in a play are considered. Other blots and spares are irrelevant.

When a roll of non-doublets is played so as to create two new blots or spares neither of which is in the outer board, then the blots and spares that are closest to the 6pt are compared first. Here, we can decide the ranking without considering the blots in the back quadrant. Their positions would matter only if there were a tie between one of the blots in the home board.

The E (Each) Family
Play Far Down Jump Inside Hits on
These Points
(more is better)
(higher is better)		 Owned Points Not Held
by All Members in Family
(more is better)
(closer to 6pt is better)		 Blot and Spare
Destinations
(closer to 6pt is better)
(outer board: farther is better)		 Nactation
bar/20, 6/3 bar/20 6/3 3pt* 20pt E
bar/22, 6/1 bar/22 6/1 1pt* 22pt e

*This is the deciding criterion.

Once again, the issue is decided solely based on the destinations of blots in the inner board. They are the ones in each position that are closest to the 6pt.

The U/V (Up/Variant up) Family
Play Far Down Jump Inside Hits on
These Points
(more is better)
(higher is better)		 Owned Points Not Held
by All Members in Family
(more is better)
(closer to 6pt is better)		 Blot and Spare
Destinations
(closer to 6pt is better)
(outer board: farther is better)		 Nactation
bar/20, 24/21 bar/20
24/21		 20pt 21pt U

In the U/V (Up/Variant up) family, there is only one play.

The Z (Reverse split) Family
Play Far Down Jump Inside Hits on
These Points
(more is better)
(higher is better)		 Owned Points Not Held
by All Members in Family
(more is better)
(closer to 6pt is better)		 Blot and Spare
Destinations
(closer to 6pt is better)
(outer board: farther is better)		 Nactation
bar/22, 13/8 bar/22 13/8 8pt 22pt Z

In the Z (Reverse split) family, there is only one play.

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