50 moves and counting

A bit of a first for me tonight, as I finally had a 75 move draw ruling to make. In a topsy turvy game, the two players involved took turns at gaining and then losing the advantage until a Rook v Bishop ending was reached. As there were no pawns left, the player with the bishop headed straight to the corner, correctly choosing the one his bishop did not control. This allowed him to block any annoying checks, and set up some stalemate situations. The stronger side kept pushing (as is his right), but to no avail. Once they reached move 50 (around move 140 in the actual game), I wondered if a claim would be made (by the player with the bishop most likely), but none was forthcoming. As the players were moving quite quickly I did not mind, and soon enough move 75 was reached, at which point I stopped the clocks.
I've had longer games, and indeed I once was an arbiter where the players played at least 80 moves after the last pan move or capture, but this was before the 75 move rule was on the books.