countermove

noun

1. A move in opposition or response to a preceding move.

   “move and countermove”

   “There are countermeasures to deceptive jamming, too, just as there are ECCCM to ECCM, all the way to infinity. It’s a giant chess game out there, moves to countermoves, and it never stops.”

   “When you're ready, just call out the position of the pieces and I'll give you a countermove.”

verb

1. To move in opposition or in retaliation.