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)

---

Diagram 10: Red moves first

P5=4 k6=5
K5=4 p5=6
P4=5 k5=6
K4=5 p6=5
P5=4 ...

Explanation:

Both Red's move of king and Black's move of pawn are considered as "resolve threatening to checkmate and threatening to checkmate back", this is a draw if neither side changes the move.