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Fast Chess Contradance. Solitaire chess puzzle: four white and four black pieces must change places without attacking.[All Comments] [Add Comment or Rating]
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 of Andy Lewicki 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. 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:

I am enjoying your Chess Variants website very much.  I have a question
about the rules of Chess Contradance and Fast Chess Contradance, and I
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
they are both correct, and the answer is (c)?
Thank you very much for your time and attention!
Steve Schoenig

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