2 | Knights capture as rooks, and rooks capture as knights.
4 figure.diagram-container
6 | fen:r1bqr1k1/pp2ppbp/2n2np1/1BpN4/5P2/4PN2/PPP3PP/R1BQ1RK1:
8 | fen:r1bNr1k1/pp2ppbp/2n2np1/1Bp5/5P2/4PN2/PPP3PP/R1BQ1RK1:
9 figcaption Before and after Nxd8.
14 | The variant is mentioned
15 a(href="https://www.chessvariants.com/play/erf/NewZChss.html")
17 | . It was probably invented around 1903.