History doesn't ask who played fair, only who won.

Cheating generally describes various actions designed to subvert rules in order to obtain unfair advantages. This includes acts of bribery, cronyism and nepotism in any situation where individuals are given preference using inappropriate criteria. The rules infringed may be explicit, or they may be from an unwritten code of conduct based on morality, ethics or custom, making the identification of cheating conduct a potentially subjective process. Cheating can refer specifically to infidelity. Someone who is known for cheating is referred to as a cheat in British English, and a cheater in American English. A person described as a "cheat" doesn't necessarily cheat all the time, but rather, relies on deceitful tactics to the point of acquiring a reputation for it.