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Reading the Numbers: Won, EV, GTO EV and EV Loss %

Understand Won, EV, GTO EV and EV Loss %, the four numbers FlopHero uses to judge a session and size a single mistake, and know which one to trust.

4 min readChecked against the app on Sep 23Every game
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Four numbers describe how you played: Won, EV, GTO EV and EV Loss %. Read them right and you can tell a real leak from a run of bad cards, and measure what a single decision cost.

FlopHero names them on screen but does not define them. The hand list's Columns menu gives each its full name, and these are the definitions behind those names.

Won: what landed in your stack

Won is the amount you won or lost, added up straight from the hands you played. It is the real result, good cards and bad cards included.

EV: the same result with the all-in luck taken out

EV is short for expected value. In the hand list it is the hand's Won figure with one change: if the hand went all in and reached showdown, it counts at the equity you held when the chips went in, and the card that came does not change it. Every other analyzed hand carries the same number in both columns, so a gap between Won and EV comes from all-in luck. The sessions table adds the same figure up for each session, under All-in EV.

GTO EV: how much you left behind

The label works against you: GTO EV is the EV the hand gave up against the solver's line, and its full name in the Columns menu says so: GTO EV loss. It reads zero or negative for that reason.

0 bb means the hand gave nothing up; -0.02bb means your decisions in it cost two hundredths of a big blind against the solver's line, so the figure measures a cost.

Three columns, three different questions

Line the three numbers up for one hand. Won is what landed in your stack, and EV is that same result with the all-in luck taken out. GTO EV measures what the hand gave up against the solver.

Won and EV disagree on hands that reached an all-in showdown. GTO EV plays no part in that argument: it counts what was left behind, so it does not go up when you run well.

To size a single decision instead of a whole session, use EV Loss % below.

EV Loss %: sizing one mistake against the pot

Won, EV and GTO EV are amounts, in big blinds or dollars. EV Loss % puts the loss in proportion: how much expected value the hand gave up, measured as a percentage of the pot.

Because it is measured against the pot, the same EV lost counts as a bigger mistake in a small pot than in a large one.

In Hero Mistakes the hand list opens ranked by EV Loss %, biggest losses first. In Sessions it opens by date; click the EV Loss % header to rank your hands by it.

The decision grades measure something else: they compare your decision against the solver's best action, while EV Loss % compares it against the pot. A hand can carry a low EV Loss % and still be graded Blunder. Decision Quality covers the grades. You can also filter your hands by mistake size; The Hand List and Filters shows how.

Which number to trust

Won is the result you got. EV is that same result with the all-in luck taken out, so it answers one narrow question: how the session would read if your all-ins had run at expectation. Neither of them tells you whether you played well. EV Loss % is the one that does, because it measures each decision against the solver's line, hand by hand, and that is the part you can change.

Where these numbers appear

These four numbers turn up across FlopHero:

  • In Sessions, the sessions table shows Won, All-in EV and BB/100 for each session, and the hand list below it shows Won, EV, GTO EV and EV Loss % for each hand. Won and EV are also two of the four lines on the graph; the other two break your winnings down by showdown, explained in The Sessions Dashboard.
  • In Hero Mistakes, EV Loss % ranks the hand list by mistake size. See The Hand List and Filters and Hero Mistakes.
  • The Units control at the top right of the Tracker switches the values between $ and bb. A Display Currency setting makes the same choice inside The Hand Replayer.
  • In the Trainer, the feedback display can show either EV or EV Loss %, whichever you set. Reading Trainer Feedback covers it.

Questions

Why does my GTO EV read zero or negative?

GTO EV is the EV the hand gave up against the solver's line, and its full name says so: GTO EV loss. Zero means the hand gave nothing up; a negative number is what it cost, in big blinds. It never reads positive, because it counts what was left behind. Reading the Numbers lines it up beside Won and EV.

From General and Technical FAQ

What do the Optimal, Strong, Weak and Blunder grades mean?

Each analyzed hand carries one grade, decided by whether the solver plays your action and how much the action gave up against its best one. Optimal and Strong are actions the solver plays too, giving up at most 1% and up to 10% of the best action's value. Weak is an action the solver does not play, giving up 10% or less, and Blunder is any action above 10%. Decision Quality covers all four.

From General and Technical FAQ

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