Against a maniac

What is said

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1. 0:00GTO is not the most profitable way to play poker. Here's why.
2. 0:04Meet the maniac. He's been hammering out bets all night.
3. 0:08He barrels the flop, the turn, and overbets the river. All in, for $686.
4. 0:15You hold a pair of nines. GTO solvers will tell you to fold. They assume a perfect opponent.
5. 0:20But the maniac? He's far from perfect. He bluffs every chance he gets. Against him, this call earns about $320.
6. 0:29But the night he stops bluffing, every call pays him off. Your exploit becomes your leak.
7. 0:34No read? Play GTO. Seen him bluff all night? Call him down.