Hero is new a player at table sitting on around 490. First position limps(covers). MP3 limps(350), Cutoff limps(covers), Hero limps 7s6s. SB folds. BB Check(covers). Pot (27-2=25).
Flop 259rainbow. Checks thru. Turn off-suit 4. Checks thru. River 3. Board reads 25943. Hero has the nuts. BB checks, EP1 leads for 20, MP3 folds, CO calls, Hero?
Turn should be a bet here a lot. There are enough villains I wouldn't do it all the time, but your in position and both both of your straight draws are the nuts.
In any case, river is great situation. With the bet and call in front, there is a good chance somebody has a 6 and will call a big raise. Stacks are too big too shove unless somebody seems stationary or fishy but if you think it has a chance of working go for it. I would split between $150 and $80, $150 is aimed at getting a call from 6X while $80 might get both to make a crying call with two pair+.
Prison rape shove. Best line is to target 6x which wont fold no matter how ridiculously oversized our bet is. Seems way more profitable than trying to get 60 more bucks from Ax.
This is the same as having 99 on a kk99x board with a bet and a call on the river. You shove because somebody has the fake nuts (a K in my fake hand, a 6 in this case), and they are never ever folding.