Well done, Granama; so football beat tennis! I'm a bit worried in case the bankrupt Boris B has an active Google Alert, sees my clue and sues me.
Thanks for the comp., Jimmygtal. I'm wishing I'd made MagnusC my handle here now. Are you a chess player in the UK? I think some of the clues were more about stalemate than checkmate. I expect you know the derivation is from
Shah mat, the king is dead. Thank goodness for online chess during the lockdown.