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In chess, let's introduce the concept of a "turn unit" – this is when both black and white make one move each.
Options:
-------1st: The game does not continue until a turn unit is completed (someone hasn't made their move).
-------2nd: The game does not continue until 2 turn units are completed (someone can make 2 moves).
Since we can prove that checkmate can be achieved in 2 moves with the opponent's pieces in place (there are situations where if black stands still, white can deliver checkmate in 2 moves; if black moves, there will be no checkmate), we can use the 2nd option with a certain degree of accuracy (we can empirically calculate the number of scenarios where white delivers checkmate in 2 moves and divide it by the total number of scenarios – the simplest method. If this ratio turns out to be much less than one, then the 2nd option will suit us). The most accurate option would be the 1st.
To avoid overcomplicating things, we simply simulate: we enable "OH" (presumably a game mode or feature), and we see that the game is played according to the rules – the knight moves as it should, etc. The main rule that interests us is that the goal of the game is to kill the king, and we need to develop our strategy based on that.