Add Castle Chess
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1 p.boxed
2 | Captured pieces are stunned. They disappear if you capture them again.
3
4 p
5 | This variant is inspired by the
6 a(href="https://en.wikipedia.org/wiki/Super_Mario") Super Mario
7 |  universe.
8 | When a piece captures another, it "bounce" on it until the next square in
9 | the movement's direction. If this next square is occupied, then it keeps
10 | bouncing and reach the following square, until either a free square or the
11 | edge of the board is met. In this last case, the capturer is lost.
12
13 p.
14 Pieces bounced over are then "stunned" for two moves (four half-moves):
15 they cannot move during this period. If they get captured again while being
16 stunned, they are "kicked" out of the board, and all pieces standing on their
17 way vanish as well.
18
19 figure.diagram-container
20 .diagram.diag12
21 | fen:nrkqnrbb/ppp2ppp/3p4/4p3/1P3P2/8/P1PPP1PP/BNQRNBKR:
22 .diagram.diag22
23 | fen:nukqnrbb/pps2ppp/3s4/4s3/1P6/8/P1PPP1PP/BNQRNBKR:
24 figcaption Before and after 1.fxe5
25
26 p.
27 After the move 1.fxe5 on the diagram, the red pieces are stunned for two
28 moves. So white can then play 2.Bxe5, kicking the pawn and capturing (for
29 real) at least the h8 bishop. An option for black may be 1...Qg5, such
30 that after 2.Bxe5 Qxe5 black threaten to kick the white stunned bishop out.
31
32 figure.diagram-container
33 .diagram.diag12
34 | fen:nuk1nrb1/pps2p1p/3s4/4B1q1/1P6/8/P1PPP1PP/1NQRNBKR:
35 .diagram.diag22
36 | fen:nuk1nrb1/pps2p1p/3s4/3qC3/1P6/8/P1PPP1PP/1NQRNBKR:
37 figcaption After 1...Qg5 2.Bxe5 Qxe5: white bishop is stunned.
38
39 p.
40 The goal is to capture the enemy king. Moves which kick your own king
41 out are forbidden, but stunning him is allowed.
42
43 h3 Source
44
45 p
46 a(href="https://www.jsbeasley.co.uk/encyc.htm")
47 | The Classified Encyclopedia of Chess Variants
48 | , section 3.6. This variant is also listed on chessvariants.com:
49 a(href="https://www.chessvariants.com/crossover.dir/koopachess.html")
50 | Koopa chess
51 | .