--- /dev/null
+p.boxed
+ | In addition to standard moves, a piece can be exchanged
+ | with an adjacent friendly unit.
+
+h3 Specifications
+
+ul
+ li Chessboard: standard.
+ li Material: standard.
+ li Non-capturing moves: standard + switch.
+ li Special moves: standard.
+ li Captures: standard.
+ li End of game: standard.
+
+h3 Basics
+
+p.
+ Instead of a normal move, a piece may be exchanged with an adjacent friendly one.
+ Switching can move pawns until rank 1 or final rank. In the first case a 2-squares
+ jump is possible, and in the second a promotion occurs.
+ Switching must involves two different units.
+ Switching while the king is under check is not allowed.
+
+p.
+ Notation: a switch move is marked by the capital letter 'S' followed by
+ the exchanged squares. Example in diagram: Sb8c8
+
+figure.diagram-container
+ .diagram
+ | fen:1RB3k1/5ppp/8/8/8/8/8/K7:
+ figcaption White can mate in 1 by switching b8-c8
+
+p.
+ Note: if the king and rook are on two adjacent squares, castling and switching
+ from the king are triggered in the same way. Castling takes priority:
+ if you wanna switch, use the rook.
+
+h3 Source
+
+p
+ a(href="https://www.chessvariants.com/diffmove.dir/switching.html") Switching chess
+ | on chessvariants.com.