Gamesmanship

[Marquetta]

To manipulate the truth using words and actions, with the intent of [crafting] the perception of others to your benefit.

It often has the appearance of, [playing dumb], or [bad luck].

It is not the individual occurrence that defines it, but the long-term pattern. The truth is what I say it is.

[Oralee]

The art of winning games by using various ploys and tactics to gain a psychological advantage.

[Sommer]

the activity of trying to win a game by doing things that are not really breaking the rules but are intended to destroy the confidence of the other player