10. "Resolve threatening to checkmate and threatening to checkmate back" should be ruled as a draw. One side threatening to checkmate in each move, the other side resolves threatening to checkmate and threatening to checkmate back, can be ruled as a draw if neither side wants to change move. (See example in Diagram 10)
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Diagram 10: Red moves first
P5=4 k6=5
K5=4 p5=6 P4=5 k5=6 K4=5 p6=5 P5=4 ...
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