I just finished playing a pair of tournament games against a player whose rating was substantially higher than mine. I lost the first game in a rook and pawn ending. I politely resigned when the ending was clearly lost. The second game, a 56 move marathon, came down to a Queens and pawns ending in which I held a passed pawn. It was a nail-biting contest where I generally had only one move that would not lead to my king being checkmated or to a draw by perpetual check. I agonized over the game and eventually promoted my pawn. At the mate-in-one stage my opponent neither moved nor resigned. Instead, he let me wait 3 days to win on time. This struck me as unsportsmanlike. How does the rest of the community feel?