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Fast Chess Contradance. Solitaire chess puzzle: four white and four black pieces must change places without attacking.
George Duke wrote on 2009-08-10 UTC
Another Robinson puzzle that current Alphanumeric belongs in the same class by being exchange of positions. And Robinson comment leads to Hippodrome on 4x4
http://www.chessvariants.org/solitaire.dir/hippodrome.html of Andy Lewicki
http://www.chessvariants.org/solitaire.dir/quadrille.html and her own Queen's Quadrille above. The potential threefold similarities among some combinations of these draw from small boards 4x4 to 6x6, piece occupancy over 60% or over 80%, and thirdly exchange of positions being the puzzle or win condition. By happenstance there are several of them around Karen Robinson. Alphanumeric at ChessboardMath8 has 100% piece density on 6x6 and two opposite goal squares by exchange of positions.
http://www.chessvariants.org/index/displaycomment.php?commentid=23477 Goal squares feature in Roberto Lavieri's Maxima for another case.

Tony Quintanilla wrote on 2004-11-29 UTC
The editors received the following question by e-mail:

Hello,

I am enjoying your Chess Variants website very much.  I have a question
hope you can help me.

Is a piece forbidden from (a) moving onto a square where it threatens
(actively) a piece of the other color, OR (b) moving onto a square where
it is threatened (passively) by a piece of the other color, OR (c) both?

The rules for Chess Contradance sound like the passive rule (b), but the
rules for Fast Chess Contradance sound like the active rule (a).  Or
maybe
they are both correct, and the answer is (c)?

Thank you very much for your time and attention!

Steve Schoenig