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Nacbracs for Cube Actions — Updated Summary

Posted By: Taper_Mike
Date: Tuesday, 18 February 2014, at 9:45 p.m.

In Response To: Nacbracs for Cube Actions — Summary (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 in this post. Bot code and trial counts are appended following the brackets, but they are not discussed here. See Nack’s excellent Explanation of nacbracs to learn how bot code and trial counts are encoded.

Definitions: Action, Equity and Error

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

[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 – The value here depends on the proper cube action.
     
    When action is N or X, use Equity( no double ).
    When action is D or R, use Equity( double, take ).
     
    In most cases, equity gives the equity resulting from the proper cube action. The only exception occurs when the correct cube action is Double/Pass. In that case, instead of coding the obvious equity of a drop, the equity for an incorrect take is substituted.
  • error – Subtract Equity( double, take ) from Equity( no double ), and take the absolute value (i.e., discard the minus sign if the result is negative).
     
    This error is the difference between the equity coded above and the 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 en-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 en-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 en-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 en-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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