Using Stonemasons and Chapel, I had come to a deck consisting of 8 Grand Markets, 2 Treasuries, 3 Silver, Chapel, 1 Stonemason. Excellent hand, likely to gain 2 Provinces a turn for the rest of the game. My bot opponent, who had been buying out Treasuries like I had done to Grand Markets, bought the last Treasury and a Duchy - thus threepiling Grand Markets, Treasuries and Stonemasons. I lost 6-0.