Spots we rarely think about

[scallop]

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2. i want them to know i have a weak hand when i check the flop (weird?)

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Is to induce a 'bluff' on the turn?

Also - opponent is passive, doesn't that mean that he will not bluff the river if we bet flop/check turn very often ?

Therefore, if you bet and fold out all the unpaired, no draw hands you win the pot. If he calls with draws and misses by river you probablly get to see a showdown with a pair (because he might not bluff river), or of course he calls, ends up winning and all you lose is your c-bet, and you never call if he bets (unless you catch a 2).