--- /dev/null
+p.boxed
+ | Win by eliminating all opponent pieces of the same type.
+
+h3 Specifications
+
+ul
+ li Chessboard: standard.
+ li Material: standard.
+ li Non-capturing moves: standard.
+ li Special moves: standard.
+ li Captures: standard.
+ li End of game: pieces extinction.
+
+h3 Basics
+
+p.
+ Standard rules apply, but the game ends when all pieces of a kind disappeared.
+ Kings are treated as normal pieces (no royal power), but may castle -
+ without any concern about checks.
+ Pawns may promote into king.
+ If all pieces of a kind disappear, the game is lost; except if it's a
+ pawns extinction which results in a non-pawn extinction by capturing and
+ promoting on the last rank.
+
+h3 End of game
+
+p.
+ Win by eliminating all enemy pawns, or rooks, or knights, or bishops, or queen(s),
+ or king(s) (there may be several if promotions happened).
+
+figure.diagram-container
+ .diagram
+ | fen:n3brk1/5ppp/3q4/8/8/8/1Q3PPP/K1R1B1N1:
+ figcaption White can win in 2 moves: 1.Qb7, 2.QxN
+
+h3 Source
+
+p
+ a(href="https://www.chessvariants.com/winning.dir/extinction.html") Extinction chess
+ | on chessvariants.com.