masterstroke

master +‎ stroke

masterstroke (plural masterstrokes)

1. An action which demonstrates great skill or artistry.
   • 2012 September 15, Amy Lawrence, “Arsenal's Gervinho enjoys the joy of six against lowly Southampton”, in the Guardian‎:

     The Ivorian is a player with such a liking for improvisation it does not usually look like he has any more idea than anyone else what he is going to do next, so it was an interesting choice. As it turned out, it was a masterstroke. The striker was full of running, played with a more direct shoot-on-sight approach than normal and finished with two goals and an assist.