With two provinces left on turn 12, as second player, with plentiful draw and buys and both of us stocking dangerous amounts of coin tokens, and with me behind by two points, I clearly have to buy a Duchy. Now opponent is in the same position. It's already clear that he'll win, but it's equally clear that we're going to have to go through the entire Duchy and Estate piles before he can do it, which is what happens.
https://dominion-game-logs.s3.amazonaws.com/game_logs/20160513/log.0.1463181275495.txt