Janus Chess: The two-face piece with German origins

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Janus Chess, created by Werner Schöndorf of Bildstock, Germany, in 1978, is a captivating chess variant. Its distinctive gameplay unfolds on a 10×8 board and introduces a remarkable fairy chess piece called the janus. The janus piece possesses the combined movement abilities of both a bishop and a knight. The name of this unique chess piece draws inspiration from the Roman deity Janus, renowned for being depicted with two faces gazing in opposing directions."

https://lookintochess.com/janus-chess-the-two-face-piece-with-german-origins/