Reaction game radio signals

Hi. I’m trying to create a reaction game where 3 microbits are on the same radio channel. A ‘main microbit’ is connected to 3 LEDs and should light up as cues for the 2 players to react to. I want this main microbit to keep track of the points as the two players press the correct buttons corresponding to the lit LED. For example, yellow light = button A.

I want the main microbit to only award points to the player who responds first. That is, it should not accept, or ignore, any more incoming information once the correct answer is received from one of the players. Any clever ways to do this?"