: a move designed to check, offset, or counter another move
Chess-playing programs, for instance, were … instructed to look ahead and try to calculate all possible moves and countermoves. Tom Alexander
… had seen … a linebacker drift out and line up nose to nose on a wide receiver. It surprised them, and they had come up with a countermove. Mark Bowden
… wanted to play out the long-term implications of possible U.S. moves and Iranian countermoves. James Fallows
"Their kidnapping of Miss Tuppence is the counter-move to your escape." Agatha Christie