--- /dev/null
+p.boxed
+ | Move twice at every turn.
+
+h3 Specifications
+
+ul
+ li Chessboard: standard.
+ li Material: standard.
+ li Non-capturing moves: standard.
+ li Special moves: standard.
+ li Captures: standard.
+ li End of game: standard.
+
+p.
+ The only difference with orthodox chess is the double-move rule,
+ but this affects the game a lot.
+
+h3 Basics
+
+p.
+ TODO: explain, every turn twice except if check on 1st turn, or
+ very first move in game.
+ En-passant: possible in any order if 2 ep squares,
+ otherwise has to be the first move.
+ OK even if opponent moved his pawn at subturn 1.
+
+figure.diagram-container
+ .diagram
+ | fen:r3kbnr/pp3ppp/3p4/4p3/8/8/PPPPPPPP/R1BQKBNR:
+ figcaption After the moves 1.Nc3 d6?? 2.Nd5 e5 3.Nxc7
+
+h3 More information
+
+p.
+ Possible starting point Wikipedia page ?