[AngusThermopyle]

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1) hiding high value chips in the bottom back row of your stack so opponents get inaccurate chip counts for you.


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Against the rules in most places.

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2) leaning back in your chair to see the hole cards of others. (this was recently done online)


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Cheating

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3) declaring your hand incorrectly at showdown to entice your opponent to muck a winning hand


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Angle

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4) Mucking a hand into an opponents hand to kill it and consequently award the pot to a friend


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Cheating, period.

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5) Softplaying friends


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Not illegal. Not angle