Agreed with all above, check jam on the river is horrible and only really acts as a bluff. If he is bluffing, go ahead and call him, but otherwise there are very few made hands that you are beating. When he gives you 4/1 on the turn rather than a stronger bet or a check it is very suspicious. Unfortunately it's hard to have time to think each hand through, and hard to concentrate fully on every hand we play, only realising after the fact, which hands were the most important ones. These mistakes happen. Who knows, some days, he is the one making the mistake, calling your wierd check shove having read it as a missed flush draw, ready to show you his aces, thinking he is infront.
Take-aways - think about which hands can sensibly call that you beat.
Think about your position ICM wise if you lose the hand
Remember players that have made the FT of an MTT are usually good players and won't be calling light.
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