Noun: Stratagem (STRAT-uh-jum)
1. a: An artifice or trick in war for deceiving and outwitting the enemy.
b: A cleverly contrived trick or scheme for gaining an end.
2. Skill in ruses or trickery.
Sample sentence: As a stratagem to get the kids to do their chores, Melissa persuaded them to have a race to see which child could finish first.