TODO

   1 # New variants
   2 Landing pieces from empty board:
   3 https://www.chessvariants.com/diffsetup.dir/unachess.html
   4
   5 S-chess https://en.wikipedia.org/wiki/Seirawan_chess
   6
   7 Generator variant, called "Matrix" ?
   8 Peces on first rank never move but generate new pieces. Pawn don't generate.
   9 A generator captured and replaced by a similar piece does not generate.
  10 King does not generate. No castling. En passant possible?
  11 Goal is still checkmate.
  12
  13 Take(a)n(d)make : if capture a piece, take its power for the last of the turn and make a move like it.
  14 If a pawn taken: direction of the capturer.
  15
  16 Maxima, Interweave, Roccoco
  17
  18 Synchrone Chess: allow to anticipate en-passant capture as well :)
  19
  20 Dynamo chess