Blockers improve your probabilities, but they are still far from certain. And what solvers and highly algorithmic and mathematical approaches sometimes end up doing is giving you a false sense of certainty: because the math tells me this, I’m more confident (correctly so), but perhaps a bit too confident given the extra data. And so I may fail to take in new data—the behavior of a player at the table, say—as I make my decision because I have a slightly misplaced sense of security. He can’t possibly call me here, goes the thinking.
