What is Metagaming?
1.
The act of using outside or previously gained knowledge within a gaming universe for personal gain or advantage.
John was accused of metagaming when he immediately moved his player to the most protected area of the map to snipe the enemy team members, since he had played the map before and knew from experience.
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2.
Predicting an opponent's decision in competitive gaming as a result of analysis of the opponent's past decisions.
There is a special set of moves in chess which allows a player to win in four moves. Competitor A has been watching Competitor B play chess, and the past five games in a row Competitor B has attempted to use this four-move win. When Competitor A sits down to play against Competitor B, Competitor A will be metagaming if he/she plays in a way that will easily thwart the four-move checkmate before Competitor B makes it obvious that this is what he/she is doing.
-from Wikipedia
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