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Nactations of 61P-62R-52S-22N-32 — 2011 Update

Posted By: Taper_Mike
Date: Friday, 23 December 2011, at 7:53 p.m.

In Response To: 61P-22N-52S-21U-11p-63R-32 (variant) (Nack Ballard)


1O '1O2X '3X '3X ' '2X3O

1X ' ' ' '5O2O3O1X ' '3X

61P-22N-52S-62R-32


In a post from July 2010, Nack includes @ (Anchor), B (Both) and b (both) as possible Nactations for moves in the position 61P-22N-52S-62R-32. All three are now obsolete.

Technically, there is a dedication clause that is now part of @ (Anchor), so it can no longer be used for 24/22 8/5. Nack announced the dedication clause in a post entitled Nactation: Study, Tutorial Supplement, and Annactated Game. Although he mentions that assumption might allow you to ignore the dedication clause, it is a bit much for an intermediate like me to assume 8/5 here. Use C (Cross) for 24/22, 8/5.

A division of labor for B, S and Z (see the table below) was also revealed in the Tutorial Update. In a roll of non-doublets, B (Both) requires that the down portion of the move be played entirely within a player’s outer board. Unlike the the usual definition of down, you cannot play from the far outer board into the outer board. Technically, 24/22 13/10 is a member of the Z (Reverse split) family. Because the S (Split) family is empty, it can also be nactated S.

Definitions: B (Both), S (Split) and Z (Reverse split)
Family Non-doublets Doublets
B One die is played on the far side, and one die is played entirely within the outer board (on the near side). Two dice are played on the far side, and two dice are played down.
S The larger die is played on the far side, and the smaller die is played into the outer board from the opponent's outer board. When no such play exists, S can also be used as an alternative to Z. Three dice are played on the far side, and one die is played down. When no such play exists, S can also be used as an alternative to Z.
Z The smaller die is played on the far side, and the larger die is played into the outer board from the opponent's outer board. One die is played on the far side, and three dice are played down.

In all of these definitions, “down” refers to, “A move made to or within the outer board. The checker must land in the outer board on the near side, but can be moved from any point in either outer board.”

A play on the far side of the board means, “The entire move is made on the far side of the board, including entering a checker from the bar. The checker can land anywhere on the far side, from the midpoint on up.”

Mike

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