Here's a tournament lesson

[PantsOnFire]

Player A has about 35,000 chips Player B has about 2000 chips. Blinds are 100/200. Pot starts at 900 with 3 limpers and BB in. Player A bets 500. Player B calls, all others fold, pot is 1900. Turn is checked.

On the river, Player A bet 1300. Player B has 1500 and calls and loses. Player A had flopped a full house. Player B had the nut flush.

So Player B is still in it and doubles up four times in a row then moves tables. I don't know what happened to him after that.

So why on God's green earth did Player A not bet 1500 on the river? Did Player A think 1500 wouldn't get called but 1300 would? That's just nuts (pun intended).