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Nactation — Clarifying S (Split), Z (Reverse split), and B (Both) — Updated Dec. 2012

Posted By: Taper_Mike
Date: Monday, 31 December 2012, at 10:35 p.m.

In Response To: Nactation Question — Clarifying the B, S and Z Families (Taper_Mike)

Definitions: S (Split), Z (Reverse split), and B (Both)
Nactation Family Non-doublets Doublets
S Split

The larger die is played on the far side side of the board, including entering a checker from the bar.

The smaller die is played into the outer board from the opponent’s outer board.

When no such play exists, the Convenience Clause (optionally) allows S to be used as an alternative to Z.

Three dice are played on the far side of the board, including entering one or more checkers from the bar.

One die is played down (i.e., to or within the outer board).

When no such play exists, the Convenience Clause (optionally) allows S to be used as an alternative to Z.

Z Reverse split The smaller die is played on the far side of the board, including entering a checker from the bar.

The larger die is played into the outer board from the opponent’s outer board.

One die is played on the far side of the board, including entering a checker from the bar.

Three dice are played down (i.e., to or within the outer board).

B Both

One die (large or small) is played on the far side of the board, including entering a checker from the bar.

The other die is played entirely within the outer board (on the near side).

Two dice are played on the far side of the board, including entering one or more checkers from the bar.

The other two dice are played down (i.e., to or within the outer board).

### Notes

1. When there is more than one play in a given family, the Hit/More/Six Rule is used to rank the members.
2. S, Z and B are all areal (i.e., area-based) families. Membership is determined by the areas of the board where checkers are moved. In the case of S and Z, this occasionally yields the odd result that a “splitting” play does not split the rear checkers. 32S-64H-43 and 42P-43S-65R-64 (both diagrammed below) are typical examples.

32S-64H-43, S (Split) = bar/21, 13/10
Position ID: 4HPwBSDgc/AAUQ Match ID: cIkRAAAAAAAA

42P-43S-65R-64, S (Split) = 20/10
Position ID: mGfwAyDgc+IBIQ Match ID: cAkTAAAAAAAA

Mike

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