I'm the one who used that expression. "Gotcha" is a corruption of "Got you", which means "I have got you" or "I have caught you", the idea being that one person has caught the other in a contradiction. Someone who is posting in this way, hoping to catch someone posting information or opinions different from those contained in a different post by the same person, is not always using the forums in good faith, but making a game of it, trying to entrap others into saying apparently contradictory things, hence the word playing .
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