ZEITGEIST
(a chess variant by John Cooper)
Zeitgeist uses most of the standard chess rule set, but includes rules for simultaneous movement.

Before each turn, each player writes down his or her next move using usual chess notation. When players signal that they are ready, both pieces move at the same time. After simultaneous movement, some spaces might contain two or three pieces. Conflicts of placement are resolved as follows:

1. Illegal pawn movement - Pawns can move forward, or capture diagonally. A pawn must bounce back to the space it started from on that turn if it captures an empty space (except through en passant), or moves into a stationary piece's space. A stationary piece is any piece that did not move in that same turn, or was forced to bounce.
2. Blocked movement - Only the knight can move through intervening spaces occupied by stationary pieces; all other pieces attempting this will bounce. Any piece may move through spaces occupied by pieces that have moved in the same turn.  As in normal chess, a player may not castle through check. Any piece that bounces is treated as a stationary piece for the rest of the turn.
3. Space occupied by exactly two pieces of the same color - The active piece must bounce back to the space it launched from on that turn.
4. Space occupied by exactly two pieces of different colors - If both pieces captured into the space, both pieces are removed. If only one piece captured into the space, the other is removed. If neither piece captured into the space, all pieces retreat to launch spaces.
5. Space occupied by three pieces - All outnumbered and stationary pieces are removed from play. (Example: I attempt to capture your stationary pawn with my knight. meanwhile you use another pawn to capture into the same space. The space now contains three pieces. My knight is outnumbered by your two pawns, so it is removed. Your stationary pawn is also removed, leaving your capturing pawn as victor.)
6. Pawn promotion  - After resolving all placements, a player's pawn that has reached its opposite row may promote. If both players are promoting on the same turn, promotions are written down and then revealed simultaneously.
7. Announce "check" - As in normal chess a player must give warning if the opponent's king is in check, i.e. can be theoretically captured on the following turn.
If a player's king is captured, or put in check for two consecutive turns, that player loses. Note that it is entirely possible for both players to lose at the same time.

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