The Rules of Cypher Chess

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II. Sanctuary in the Court, Border and Field.

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a. The major pieces (Queens, Bish-ops, Knights and Rooks) cannot capture each other or put the King 

into check in the Field (though see collusion, below).

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b. The major pieces cannot capture each other on the Border. From Border squares, they can attack major pieces in the Field and check the King. (See section on the King and its Border powers.)

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c. The major pieces cannot capture each other within Court. From Court squares, they can capture major pieces in the Field and  

check the King.