views/rules/Upsidedown/en.pug

   1 p.boxed
   2     | Pawns start on the 7th rank. Move a knight to promote them.
   3
   4 h3 Specifications
   5
   6 ul
   7     li Chessboard: standard.
   8     li Material: standard.
   9     li Non-capturing moves: standard.
  10     li Special moves: no castling (and no en-passant).
  11     li Captures: standard.
  12     li End of game: standard.
  13
  14 p.
  15     ...(Almost) Only the initial position changes, but this is a very big change.
  16     In particular, castling would be rather pointless so it's disabled here.
  17     En-passant captures are impossible because all pawns already reached 7th rank.
  18
  19 h3 Note on initial position
  20
  21 p.
  22     Since truly random start can allow un-defendable mate in 3 with a knight,
  23     the kings touch at least one knight in the initial position.
  24     This allows to move free out of potential check from the very beginning.
  25
  26 p.
  27     To illustrate this phenomenon, although it's defendable the standard initial
  28     position allows the attack as 1.Na6 (threatening Nc5-Nd3#),
  29     forcing the defense Nf3-Ne5. With a knight next to the king you have more options.
  30
  31 figure.diagram-container
  32     .diagram
  33         | fen:R1BQKBNR/PPPPPPP/N7/8/8/8/pppppppp/rnbqkbnr:
  34     figcaption Standard initial position after 1.Na6
  35
  36 h3 Source
  37
  38 p
  39     | See for example the
  40     a(href="https://www.chessvariants.com/diffsetup.dir/upside.html") Upside down chess
  41     | &nbsp;page on chessvariants.com.