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I was playing on Stars about a month and a half ago on the .25nl tables and had 2 guys telling me exactly what my cards were when I won without showdown. I'd like to know how they were telling me this, as they told me the suits of the cards as well. It was more than just a little worrisome, and I left the table shortly thereafter. I didn't like when 2 players at the table knew that I was bluffing at half the pots I picked up.

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So supposedly someone has planted a trojan on your computer which allows them to see your hole cards, and then they were stupid enough to tell you they had done so?

This is probably actually the typical case of many players failing to realize that all players hands at showdown are available to be seen by clicking on the hand history afterwards, even if they "mucked" them.