+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
+