Hi, first of all very nice and clean project, the GUI in the other p

Exploitability Calculation - ICM about postflop-solver HOT 2 CLOSED

b-inary commented on June 23, 2024

Exploitability Calculation - ICM

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Comments (2)

b-inary commented on June 23, 2024 1

The subtraction is exactly what the evaluate function does, for example, see:

postflop-solver/src/game/evaluation.rs

Lines 22 to 26 in 7ba56e7

    
           let pot = (self.tree_config.starting_pot + 2 * node.amount) as f64; 
        
           let half_pot = 0.5 * pot; 
        
           let rake = min(pot * self.tree_config.rake_rate, self.tree_config.rake_cap); 
        
           let amount_win = (half_pot - rake) / self.num_combinations; 
        
           let amount_lose = -half_pot / self.num_combinations;

So if you have already modified these amount_win and amount_lose properly, this should not be a problem. Rather, I suspect you need to modify the following conditional branch:

postflop-solver/src/utility.rs

Lines 284 to 290 in 7ba56e7

    
           let mes_ev = compute_mes_ev(game); 
        
           if !game.is_raked() { 
        
               (mes_ev[0] + mes_ev[1]) * 0.5 
        
           } else { 
        
               let current_ev = compute_current_ev(game); 
        
               ((mes_ev[0] - current_ev[0]) + (mes_ev[1] - current_ev[1])) * 0.5 
        
           }

Introducing ICM breaks the zero-sum property, so the if clause shortcut (L286) cannot be used. I am not confident, but I think the problem can be solved by simply using this else clause when calculating with the ICM.

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Barcode9 commented on June 23, 2024

Thanks that seemed to have stopped the convergence to 0!

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	let pot = (self.tree_config.starting_pot + 2 * node.amount) as f64;
	let half_pot = 0.5 * pot;
	let rake = min(pot * self.tree_config.rake_rate, self.tree_config.rake_cap);
	let amount_win = (half_pot - rake) / self.num_combinations;
	let amount_lose = -half_pot / self.num_combinations;

	let mes_ev = compute_mes_ev(game);
	if !game.is_raked() {
	(mes_ev[0] + mes_ev[1]) * 0.5
	} else {
	let current_ev = compute_current_ev(game);
	((mes_ev[0] - current_ev[0]) + (mes_ev[1] - current_ev[1])) * 0.5
	}

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