+p.boxed
+ | Your pieces remain in an undefined state until they are moved.
+
+p.
+ Queens, rooks, bishops and knights begin the game in a reserve below
+ the board, because their location isn't determined yet.
+ At each turn, you can either move something already defined on the board, or
+ol
+ li move a piece from your reserve to any question mark, and then
+ li move the now defined piece on the board.
+
+p An undefined piece gives check if some specialization giving check exists.
+
+figure.diagram-container
+ .diagram
+ | fen:uuuuu1uk/p2p1qp1/1p6/7p/7P/5N2/PP1P1PP1/UUUKU1UU:
+ figcaption The white king cannot move, a rook might be on c8 or e8
+
+h4 Details, special cases
+
+p.
+ At the first turn, you must select a square for the king anywhere on
+ first rank. This deviates from the original intention of the author,
+ but allows to "castle on move 1" without requiring a rook in a corner.
+
+p.
+ If one of your undefined pieces is captured, you first have to choose which
+ one was captured from the reserve: place it at the capture location.
+
+p.
+ If after your move all your pieces are defined (and weren't before), then
+ all pieces on board revert to undefined state, unless:
+ul
+ li.
+ all your pieces (board + reserve) are now of the same type,
+ in which case none is put back in reserve, or
+ li.
+ all opponent's pieces are of the same type, in which case
+ they also remain defined.
+
+figure.diagram-container
+ .diagram.diag12
+ | fen:uuu1kuuu/2p5/2n5/1p1ppppp/p4PPP/3N3Q/PPPPP1BB/1RRUK3:
+ .diagram.diag22
+ | fen:uuu1kuuu/2p5/2u5/1p1ppppp/p4PPP/3UU2U/PPPPP1UU/1UU1K3:
+ figcaption.
+ Before and after knight definition on d1 (moving to e3)
+
+h3 More information
+
+p
+ | See the
+ a(href="https://www.bario-chess-checkers-chessphotography-spaceart.de/")
+ | author's page
+ | with many examples and explanations, and the discussion
+ a(href="https://www.chessvariants.com/index/listcomments.php?order=DESC&itemid=Bario")
+ | on chessvariants.com
+ | .
+
+p Inventor: Panos Louridas (1998)