1.75in Button. I used to play chess and other games with my Grandfather. If a game changing move happened, he would call it a "Reversal of Fortune." Such as a move made without much thought or a plan well executed, as we got older, this phrased was used more often and more broadly such as he could have taken most of my chess pieces, but the killing blow was a "reversal of fortune" and I was like, "I don't think that is how any of this works, I have been on the run for the last 5 turns."