i'm not sure what i do on hand n°2, but i would be interested to know what do you think he flat-calls the flop with, and therefore given his hand what are the advantages of checking the turn.

is it like: if i bet he will call me down of c/r me with a hand that beats me or as a bluff and i won't be able to see a showdown

and: he 'll fold if i have him beat, instead of taking a shot on the river if i show weakness.