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This page is written by the game's inventor, Ralph Betza.

Cassandra Chess

By Ralph Betza

In the 1970s I invented Cassandra Chess, but merely presented the central idea without attempting to make a playable game out of it; recently I was reminded of Cassandra Chess, and found it sufficiently intriguing that I decided to complete the game.

Prophecies of Doom

A prophecy of doom specifies that a particular enemy piece type will be on a specified square some specific number of moves in the future. If the prophecy comes true, the targeted piece is removed from the board.

For example, suppose that each player is allowed to make a prophecy each turn, targeting any piece type, and always two moves in the future.

  1. White plays 1. f2-f4, prophecying Ke8; this means that when White is ready to play his third move, if there is a Black Ke8 it will be removed from the board.

  2. Black replies 1...e7-e5, prophecying Ke1.

  3. White plays 2. g2-g4, prophecying Ke7.

  4. Black plays 2...Qd8-h4 checkmate, and because the game ends instantly his Ke8 is not removed.

Rules of Cassandra Chess

  1. White may make no prophecy on his first move.

  2. All prophecies are aimed two moves in the future.

  3. Each player may have no more than one outstanding unfulfilled prophecy. In other words, if you make a prophecy on move 1, then on move 2 you may not make another because you have one pending, but on move 3 you will be free to try again.

  4. At the beginning of the game, one may make prophecies only about Pawns. Once a player has a successful prophecy about Pawns (or if the foe no longer has any Pawns), that player may then target Knights (or Fibnifs etc.) and may no longer target Pawns.

    The target of one's prophecies thus advances through the ranks from Pawns to Knights to Bishops to Rooks to Queen to King. A successful prophecy about a King would of course end the game.

Design Notes

Different Armies

The game works perfectly well with different armies.

When an army has an unusual balance, as for example the Colorbound Clobberers have, one might argue that one side or the other gains an advantage. This argument should be discussed on the board.

Written by Ralph Betza.
WWW page created: January 14th, 2003.