Janus chess

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a b c d e f g h i j
8 a8 black rook b8 black princess c8 black knight d8 black bishop e8 black king f8 black queen g8 black bishop h8 black knight i8 black princess j8 black rook 8
7 a7 black pawn b7 black pawn c7 black pawn d7 black pawn e7 black pawn f7 black pawn g7 black pawn h7 black pawn i7 black pawn j7 black pawn 7
6 a6 b6 c6 d6 e6 f6 g6 h6 i6 j6 6
5 a5 b5 c5 d5 e5 f5 g5 h5 i5 j5 5
4 a4 b4 c4 d4 e4 f4 g4 h4 i4 j4 4
3 a3 b3 c3 d3 e3 f3 g3 h3 i3 j3 3
2 a2 white pawn b2 white pawn c2 white pawn d2 white pawn e2 white pawn f2 white pawn g2 white pawn h2 white pawn i2 white pawn j2 white pawn 2
1 a1 white rook b1 white princess c1 white knight d1 white bishop e1 white king f1 white queen g1 white bishop h1 white knight i1 white princess j1 white rook 1
a b c d e f g h i j
Janus Chess. The janus (knight + bishop compound) is placed on the b-file and i-file, beside the rooks.

Janus Chess is a chess variant played on a 10×8 board. It features a new piece, the janus (also known as archbishop, cardinal, or princess), with the combined moves of a bishop and a knight. This piece is named after the Roman god Janus because this god was usually depicted with two faces looking in opposite directions. Janus Chess was invented in 1978 by Werner Schöndorf from Bildstock, Germany.

The usual set of chess pieces is extended with two pawns and two januses per player. Each janus is placed between a rook and a knight. The relative position of the king and queen is reversed compared to chess. After castling the king is placed on either the b-file or i-file and a rook is placed on either the c-file or h-file, depending upon which side to castle is chosen.

Note that the janus is the only piece in this game which is able to checkmate the opponent's king without the assistance of any other piece, if the king is in a corner and the janus is two squares away on a diagonal, but this checkmate cannot be forced.

This chess variant is quite popular in Europe. Several chess grandmasters play this game including Viktor Korchnoi, Péter Lékó and Artur Yusupov.

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