CEV: traps to avoid

Since the beginning of this module, we've been repeating the same thing: CEV is the Spin player's ultimate judge.

But a CEV can't be read on its own. It depends on the format you play and the opponents you face, not just on your game. Misread, it leads you to false conclusions about your level or your progress.

This chapter goes over the four reading mistakes that come up most often, among beginners and experienced players alike.

First reflex to avoid: directly comparing your CEV on one room with a friend's on another, or your standard Spin CEV with your "Ultra" / "Flash" Spin CEV. Reference CEVs are specific to a room and to a format.

The reason is simple: CEV essentially depends on two structural parameters:

• the starting stack (number of initial blinds)
• the blind level duration (how fast the structure speeds up)

The deeper the starting stack and the longer the levels, the more hands you have to play, so the more opportunities you get to put your edge to work.

Same logic on the time axis: comparing your current CEV with a room's CEV from several years ago makes no more sense. Rooms regularly change the structure of their Spins (starting stack, level duration). A reference CEV that was circulating on a forum 3 or 4 years ago may simply no longer match the format you're playing today, even if the room name and the buy‑in are identical.

Many players picture CEV as a straight line: the better I get, the higher my CEV goes, and there's no limit. Intuitively, that's appealing. In practice, it's wrong.

In reality, your CEV is what your opponents' mistakes earn you, minus what your own mistakes cost you.

Your own mistakes, you can reduce quickly: a solid preflop and a well‑mastered postflop bring them close to 0. Once past that milestone, the only ceiling on your CEV is the sum of the mistakes your opponents are willing to make.

So this ceiling depends on who is sitting at your tables. The more fish, the more mistakes pile up and the higher your ceiling. The more regs, the lower it gets.

That's why the same player sees their CEV drop when moving up in stakes: they're not playing worse, fish are just scarcer there. This brings us back to table quality, the second pillar in the chapter The three pillars of the Spin player. It's what pushes you to:

• choose your time slots to play when the fish are online,
• choose your room and your buy‑in based on the fish/reg ratio of the pool,
• only move up in stakes if the higher buy‑in makes up for the drop in your CEV.

Third trap: comparing yourself to CEV numbers seen on Discord servers. You've probably already come across a screenshot along the lines of "I ran X CEV over 15 000 Spins at stake Y". These numbers are sometimes dizzying, and they can easily make you doubt your own level.

The problem is that these runs are almost never representative. This is called survivorship bias: out of 100 players of the same level who play 15 000 Spins, about ten will post, purely by luck, a CEV well above their true level. Those are the screenshots that get passed around. The other 90, who played just as well but ran worse, post nothing.

And even on a large sample (15 000, 20 000, 30 000 Spins), a CEV keeps a far from negligible margin of uncertainty. For yours, Poker Spin Tracker calculates it: it's the confidence interval on the Chips curve, introduced in the chapter The Chips curve (CEV). A screenshot on a forum never shows it.

Constantly comparing yourself to the CEVs displayed on the internet also wears down your morale: you never feel good enough, for a level that may not be within reach in your pool, in your era, on your sample.

Final trap, and the most technical one: worrying about a CEV close to 0 or negative at certain positions. The most common case is the BB.

You can read your CEV position by position on the cEV by position card, in the Stats tab of the Dashboard.

In 3‑max, the BB pays 1 blind every hand without having asked for anything. It's defending, with a big positional disadvantage, against opponents who chose to attack it. So a negative CEV at this position is normal.

In the screenshot, it's BB vs BTN that is the most negative, in all three series.

To really get it, picture 3 players of the same level (3 identical fish, or 3 identical regs) playing against each other. Their CEVs by position won't be 0 across the board: positive at the BTN, negative in BB, with the SB in between. And the sum of the three falls back to 0.

This is what we call the structural CEV of a position: the CEV it gives players of the same level, before any question of skill. Each position has its own, and the BB's is negative.

So what really matters is not the absolute value of your CEV at a position, but the gap to that structural CEV. Example: if the structural CEV of the BB in your pool is -20 and you're running at -10 in BB, you're doing +10 better than the reference.

Conversely, if the structural CEV of the BTN is +10 and you're running at +14 at the BTN, you're only doing +4 better. In other words, a -10 in BB can be a better performance than a +14 at the BTN, even though the first number looks scary and the second one reassuring.

Poker Spin Tracker does this calculation for you. In the Leak Finder, the Exploit by position panel of the Diagnosis tab compares your winnings, position by position, with those of a GTO player who would have had your cards, against opponents who never make mistakes. Above 0, you're doing better than the reference, even if your raw CEV is negative. The chapter The Leak Finder: Diagnosis and Overview covers it in detail.