--- /dev/null
+p.boxed
+ | Knights capture as rooks, and rooks capture as knights.
+
+figure.diagram-container
+ .diagram.diag12
+ | fen:r1bqr1k1/pp2ppbp/2n2np1/1BpN4/5P2/4PN2/PPP3PP/R1BQ1RK1:
+ .diagram.diag22
+ | fen:r1bNr1k1/pp2ppbp/2n2np1/1Bp5/5P2/4PN2/PPP3PP/R1BQ1RK1:
+ figcaption Before and after Nxd8.
+
+h3 Source
+
+p
+ | The variant is mentioned
+ a(href="https://www.chessvariants.com/play/erf/NewZChss.html")
+ | on chessvariants
+ | . It was probably invented around 1903.