What’s the single most important thing to do when you’re heads-up?The first thing you should work out in heads-up play is how much it costs to make someone pass a hand. If the blinds are 100/200 and you bet 400 on top from the button and they pass, you now know that amount will make them pass a non-premium hand. Next time make it 300, and if that works try 250. You’ll eventually find their pre-flop threshold. It’s important to discover that sweet spot where you’re risking the least amount of money to steal the most amount of blinds.How loose should you be when calling a short stack all-in?