[Mi_T_Sharp]

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Classify everyone at the table as one of either:

A Jackal (crazy and unpredictable)
An Elephant (plays too many hands)
A Mouse (plays very conservatively)
A Lion (skilled and tough to beat)

Best system I ever heard of. Works every time.

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To make this even easier to remember during hands, I usually bring those "Hello, my name is..." name tags and write "mouse" or "lion" on them. Then, I can stick them on people's foreheads so that there is something to refer to during a hand.