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Playing mirror Go is often considered dishonorable. In practice it's not a major problem because it's a suboptimal strategy.
14Alejandro1
An example in chess could be the enforcement of the touch-move rule in a "friendly" game not played under tournament conditions. Personally, I would tend to see someone who insisted on applying this rule in a friendly game when the opponent makes a mistaken touch as a bit of a jerk who cares too much about winning. I am sure this varies across different people and different chess circles though.
Rules: