Add Twokings variant

[vchess.git] / client / src / translations / rules / Twokings / en.pug

diff --git a/client/src/translations/rules/Twokings/en.pug b/client/src/translations/rules/Twokings/en.pug
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+p.boxed
+  | Each side has two kings. Mate any of them.
+
+p.
+  Both kings can be checked and mated. This adds a new option to win a game,
+  by attaking both kings at the same time, as illustrated below.
+
+figure.diagram-container
+  .diagram
+    | fen:6KK/8/2Q5/8/8/5k2/2k5/8:
+  figcaption Both black kings are in check: white wins.
+
+h3 Special moves
+
+p.
+  A pawn can promote into a king, which can be mated too.
+  Probably not useful in a real game, but interesting for problems.
+
+p.
+  You can castle with any king and rook, under the same conditions
+  as orthodox castling. However, castling long is possible only with one king.
+
+p.
+  Note: to castle in a game you need to select
+  the king or queen first, and then move it to a rook.
+
+h3 Source
+
+p
+  a(href="https://greenchess.net/rules.php?v=dual") Dual Chess
+  |  on greenchess.net. Probably invented by the webmaster Uray M. János,
+  | inspired by Coregal chess from chessvariants.com.