Unfortunately the European team beat the US team definitively in the Ryder Cup. But, in a great showing of gamesmanship, Paul McGinley gave a long putt to J.J. Henry to tie their last hole and halve their match. If McGinley had not conceded the putt, the European team would have set their record in beating the U.S.
What's not good gamesmanship? Of course, cheating is an obvious. But it's also the subtle comments made about the water or O.B. before the player is about to hit, or taking a jab at your opponent's political or religious beliefs before you tee off.
If you have to resort to those tactics to "win" in your match, then remember Paul McGinley and how you want to be thought of as a golfer.