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John Lawson wrote on Sun, Oct 20, 2002 02:50 PM UTC:
It was suggessted on the Bishop Conversion Rule page that it could be used
with Modern Chess.

http://www.chessvariants.com/varvar.dir/bcr.html

I dug out my Modern Chess set because I remembered that this issue had
been addressed in the rules. According to the Mathematical Thesis of
Modern Chess, by Gabriel Vicente Maura, (2nd revised edition, 1974, page
34 note), once during a game a player may do 'the adjustment of the
Bishop'. This move allows the player to interchange the positions of
either Bishop and the adjacent Knight. Like castling, neither piece may
have moved, and the action counts as a move. This may be done only once
per game, and both players have to agree to allow this move before the
start of the game. This move is not allowed by the World Federation of
Modern Chess, but the author recommends familiarizing oneself with playing
with Bishops on different colors. This 50-page booklet also contains a
justification of the design of Modern Chess based on mobility
calculations, and two photographs of Mr. Maura with his chess set.

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