It's still middle-click in my muscle memory from the Windows XP days!
God, I used to be _really_ into Minesweeper.
One of the earliest games I made back in college was a 3D Minesweeper cube. I remember being really proud of one little detail – the detection and automatic resolution of ambiguous clues that would require guessing, which always annoyed the heck out of me in every other version of Minesweeper.
Oh, I see - double clicking only works when you have already marked the correct number of adjacent mines. I didn't remember that's how it worked in the original.
I also never knew it was called "chording", that's worth an explanation.