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Nacbracs for Cube Actions — Summary

Posted By: Taper_Mike
Date: Thursday, 31 May 2012, at 12:32 a.m.

In Response To: Nacbracs for Cube Actions? (Taper_Mike)

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This post presents a concise summary of how nacbracs are coded for cube actions.

The information here is drawn from two posts in this thread: BGO Msg. No. 119634 and BGO Msg. No. 119117. Only the data that are coded within square brackets are described here. Bot code and trial counts are appended following the brackets, but they are not discussed here. See Nack’s excellent Explanation of nacbracs to see how bot code and trial counts are encoded.

Definitions: Action, Equity and Error

We use the terms action, equity and error to describe the three things that are coded within the brackets of a nacbracs for cube actions.

[action equity±error]

  • action — The action is a single, upper case letter denoting proper cube action.
    N = no double, D = double, R = redouble and X = no redouble.
  • equity — In most cases, equity gives the absolute equity resulting from the proper cube action. When the correct cube action is “double/pass,” however, instead of coding the obvious equity of a drop, the equity for an incorrect take is substituted.
  • error — The error is the difference between the equity coded above and the absolute equity of a common error. Thus, error gives the amount of equity you lose when you make the error.
  • sign — Except in the case where the proper cube action is “no double (too good),” sign is always a minus sign. For too-good, it is a plus sign. Note: The preferred minus sign is an n-dash (Alt+0150), but you will be understood if you use a regular hyphen.
As with the nacbracs for checker play, all equities and errors are given in milli-points of equity. Multiply the number the bot reports by 1000.

The following sections detail specifics for four classes of correct cube action. Once you understand the basics, these should be all you need in order to prepare a nacbracs.

1. Proper Cube Action Is “No Double/Take”

  • action — N for no initial double, or X for no redouble
  • equity — Equity( no double )
  • error — Equity( no double ) – Equity( double, take )
  • sign — Minus sign or n-dash

2. Proper Cube Action Is “Double/Take”

  • action — D for initial double or R for redouble
  • equity — Equity( double, take )
  • error — Equity( double, take ) – Equity( no double )
  • sign — Minus sign or n-dash

3. Proper Cube Action Is “Double/Pass”

  • action — D for initial double or R for redouble
  • equity — Equity( double, take )
  • error — Equity( double, take ) – Equity( no double )
  • sign — Minus sign or n-dash

4. Proper Cube Action Is “No Double/Pass (Too Good)”

  • action — N for no initial double, or X for no redouble
  • equity — Equity( no double )
  • error — Equity( double, take ) – Equity( no double )
  • sign — Plus sign

Nack gives excellent examples in the posts cited above.

Mike

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