How hands are graded

Each analysis finds the first decision that wasn't among the right options for that hand, and grades how much EV it gave up.

Perfect: Every decision was among the right options for this hand. There can be more than one.
Inefficiency: A little EV given up. The hand is still played coherently: a size that could be better, or a plan that holds but isn't the best one.
Blunder: EV clearly given up. A coach would correct it without hesitating.
Catastrophe: A lot of EV given up. The decision was never close.
Inconclusive: The right line couldn't be verified with confidence, so the AI doesn't guess one.

There's rarely a single right play. On a board like A K 2, AK can bet small, bet big or overbet; A5 can bet small or check. Any of the right options counts as correct.

The result never counts. Every decision is judged with what you knew at that moment, against the whole ranges, as a solver would — not by the cards shown at showdown.

Only the first error is graded: once the line goes wrong, what follows depends on it.