I say good game if it was, and I'll reply, but other than that I don't use the chat, except to announce my Bongcloud Attack.
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I've noticed that some players get offended by the post-game reply "good game". Especially if they blundered grossly, and consequently losed the game. I remember one opponent on gameknot replying to my gg with: " For you it was !!"
I agree. You shouldn't say gg unless it really was.