The Rules of Cypher Chess

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VII. Check, Mate, Flipping and other rules (cont.).

 

e. Collusion (checking from the Field): Recall that major pieces and the Spy in the Field cannot check the King.

 

   "Collusion" is an exception to this rule. It describes the following situation in the Field, among Field pieces:  the King winds up in the line of attack of an opposing major piece (except the King) and that piece, in turn, stands adjacent to (i.e. on a square next to) the Spy of its own banner. Under such conditions, the King is now in check. He may be able to flee, capture the checking piece, or Flip the Spy. Recall that even when checked by the Spy, if the King can respond by moving next to the Spy, he flips him, thereby negating check and winning. This holds true for collusion, but the colluded-against-King is barred from attempting any response that would put it into check by another piece, which may be one of the colluding pieces or a piece on a Border or Court square. Keep in mind that while collusion cannot occur when either the attacker or King is on the Border or at Court, collusion may be directed against the King when he and his attackers are separated by the Border.


  Paths of check created by pieces on the Border or from Court are not affected by Collusion. The King must always avoid both types of check.


   Please review Flipping and the multiple illustrations pertinent to Collusion.