I assume, you closed your 6 point road with the tile with Inn on your last turn (adding 8 points), while your opponent used the straight road for a 9 point farm two tiles over the cloister with two roads? So right now, I do not see any options for you to denying your opponent from his farm and only one point, which you could have improved: attaching the CRCR with pennant to the CCCF with your farmer and placing your knight, would have rewarded you with 4 points instead of 3.
But I must say, I am not familiar with the iOS interface. Your opponents last tile was the straight road, your one but last the mentioned CRCR with your farmer, your last the RRRF with inn?