These are the things I use:
1. VPIP - Voluntarily puts in pot - A high VPIP is typical of fish. They do not really understand the odds which accompany opening hand strength. As a result, they play too many hands and fail to fold the dross wen they should.....
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There are more...but heck, I decided this would be a top ten....so...we'll leave it here.
Cheers,
ObbleeXY
These players usually play with all the hands in a row and only rely on their luck. For me, those opponents are just a good opportunity to double my stack.
1) VPIP >40% for full ring - 25-40% is "semi-fish"
3) Open limping in cash games or from EP/MP
4) Ridiculous bet sizes
5) Posting a blind in cash games especially from early position
6) Donk betting the flop on textures, that favour the preflop raiser
7) Donk betting the river on a blank
8) Showing down some ridiculous hand
9) Complaining in the chat
There's a lot of way recognizing a fish. Some of my obvious observations on the way they've played their hand is:
1. They limp too much
2. They don't understand the power of position
3. Playing shortstack in cash games
4. Has high VPIP rate
5. Too passive