Janus Chess

Chess variant

Chess variant on a 10x8 board with fairy chess piece: two archbishops (bishop-knight compound) on each side.

Otherwise the rules of chess apply, with the following differences:

Pawns can promote to archbishop too.
Castling: the king moves three squares, and the rook moves two or three squares, depending on the side (see diagram below).

Werner Schöndorf, 1978^[wiki]