Gamesmanship (noun)

1. The art or practice of gaining an advantage in a game or sport through the use of various strategies and techniques, often by exploiting the rules or the actions of one's opponent.
2. The use of strategy, cunning, or deceit to gain an advantage in a game or sport.

Origin:

1930s: from game + -smanship, on the pattern of sportsmanship.

Examples:

1. He was accused of using gamesmanship to win the match.
2. The athletes were well-versed in gamesmanship.
3. Gamesmanship often goes beyond simply playing well.
4. The player's use of gamesmanship was seen as unsportsmanlike.
5. Gamesmanship can include psychological tactics to gain an advantage over an opponent.