Improve Bario rules description about castling
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1p.boxed
2 | Your pieces remain in an undefined state until they are moved.
3
4p.
5 Queens, rooks, bishops and knights begin the game in a reserve below
6 the board, because their location isn't determined yet.
7 At each turn, you can either move something already defined on the board, or
8ol
9 li move a piece from your reserve to any question mark, and then
10 li move the now defined piece on the board.
11
12p An undefined piece gives check if some specialization giving check exists.
13
14figure.diagram-container
15 .diagram
16 | fen:uuuuu1uk/p2p1qp1/1p6/7p/7P/5N2/PP1P1PP1/UUUKU1UU:
17 figcaption The white king cannot move, a rook might be on c8 or e8
18
19h4 Details, special cases
20
21p.
22 At the first turn, you must select a square for the king anywhere on
23 first rank. This deviates from the original intention of the author,
24 but allows to "castle on move 1" without requiring a rook in a corner.
25
26p.
27 If one of your undefined pieces is captured, you first have to choose which
28 one was captured from the reserve: place it at the capture location.
29
30p.
31 If after your move all your pieces are defined (and weren't before), then
32 all pieces on board revert to undefined state, unless:
33ul
34 li.
35 all your pieces (board + reserve) are now of the same type,
36 in which case none is put back in reserve, or
37 li.
38 all opponent's pieces are of the same type, in which case
39 they also remain defined.
40
41figure.diagram-container
42 .diagram.diag12
43 | fen:uuu1kuuu/2p5/2n5/1p1ppppp/p4PPP/3N3Q/PPPPP1BB/1RRUK3:
44 .diagram.diag22
45 | fen:uuu1kuuu/2p5/2u5/1p1ppppp/p4PPP/3UU2U/PPPPP1UU/1UU1K3:
46 figcaption.
47 Before and after knight definition on d1 (moving to e3)
48
49h3 More information
50
51p
52 | See the
53 a(href="https://www.bario-chess-checkers-chessphotography-spaceart.de/")
54 | author's page
55 |  with many examples and explanations, and the discussion
56 a(href="https://www.chessvariants.com/index/listcomments.php?order=DESC&itemid=Bario")
57 | on chessvariants.com
58 | .
59
60p Inventor: Panos Louridas (1998)