+++ /dev/null
-p.boxed
- | Both players play a move "at the same time".
- | Conflicts are resolved following a few simple rules.
-
-p.
- In order to not rethink a big part of the code, the white move has to be
- played before the black one. However, the black player doesn't see it.
-
-p So both players play "at the same time". Resolving rules:
-ul
- li.
- If both moves arrive on the same square, both pieces disappear except
- if one is a king. In this case only the king remains.
- li.
- If a capture was intended but the target moved, the move is still played
- but doesn't capture anything.
-p.
- Such captures can be anticipated by capturing our own pieces.
- If the enemy captures as predicted, his piece disappears.
- If he doesn't, the self-capture isn't undone.
-
-figure.diagram-container
- .diagram
- | fen:rnb1kbnr/ppp1pppp/8/3qP3/8/8/PPPP1PPP/RNBQKBNR:
- figcaption After 1.e4 d5 2.e5 Qxd5 (anticipating 2.exd5 which isn't played)
-
-p.
- When the king is under check, a legal orthodox move must be played.
- Some weird situations would occur otherwise, like on the following diagram.
- If we allow self-(re)captures then the king would take on h2 and escape to
- the third rank.
-
-figure.diagram-container
- .diagram
- | fen:7k/8/8/3QR3/3P4/4P3/r6P/q6K:
- figcaption 1.Kxh2 by anticipation isn't allowed: white is checkmated.
-
-h3 End of the game
-
-p.
- Due to the simultaneity, it is possible that a king is captured for example
- after escaping a check in a wrong way, as the following diagram shows.
- So, capturing the king counts as a win, of highest priority.
- A checkmate wins too, but if your king is captured and the other still on
- the board (even if it is mated), you lose.
-
-figure.diagram-container
- .diagram.diag12
- | fen:r3r1bb/ppqRkppp/8/2p1n3/7n/8/PPPPP1P1/RNBQNBK1:
- .diagram.diag22
- | fen:r3r1bb/pp1qRppp/8/2p1n3/7n/8/PPPPP1P1/RNBQNBK1:
- figcaption.
- Left: before Rxe7 (white) and Qxd7 (black)
- Right: after the move (1-0)
-
-h3 Source
-
-p
- a(href="http://www.hexenspiel.de/engl/synchronous-chess/") Synchronous chess
- | , modified to allow en-passant captures
- | and disable the "exchange of captures" stage.
- a(href="http://www.pion.ch/echecs/variante.php?jeu=synchro")
- | Another description
- | .