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RTP Wise / Volatility and variance
Spread

Same RTP, completely different ride

Two games can return exactly the same percentage in the long run and still feel like opposites in the hand. Variance — how far results scatter around the average — is what separates them, and it is usually the figure that describes your evening.

Variance is the width of the spread

The average tells you where results centre; variance tells you how far they spread. A game that pays 1 unit almost every round and a game that pays 100 units rarely can share an RTP, because the average is the same even when the spread is not.

In practice players meet variance as the length of dry spells and the size of the wins that break them. Higher variance lengthens the lean stretches and enlarges the occasional eruption; lower variance smooths both.

Hit frequency: how often anything comes back

Hit frequency is the share of rounds that return something, however small. It is closely related to how a game feels. A 25% hit frequency means three rounds in four return nothing; a 45% hit frequency means almost half of rounds give something back.

Hit frequency is not the same as RTP. Returning something often says nothing about whether the amounts returned cover the stakes. A high hit frequency with small returns can hide exactly the same edge as a low hit frequency with large ones.

Illustrative profiles — the middle column says what a session feels like, not what it returns.
ProfileFeel of a sessionWhat it does not change
Low volatility, high hit frequencyFrequent small returns, gradual driftThe long-run edge
MediumSteady with occasional larger bumpsThe long-run edge
High volatility, low hit frequencyLong dry spells, rarer big resultsThe long-run edge
ExtremeWide swings; balance moves visiblyThe long-run edge

Two games, one RTP

Consider two illustrative profiles sharing a 96% RTP. The first pays a small multiple most rounds; the second pays a large multiple once in a great while. Their averages match. Their sessions could not be more different.

In the long run

The grinder

Rounds return small amounts often. Over a session the balance usually slides downward in small, readable steps. Winning feels incremental and rare in large sizes.

In one session

The long shot

Most rounds return nothing. The balance can sit flat or fall for a long time, then jump. The same average hides a much wider spread of endings.

If RTP were the only figure published, these two games would look interchangeable. It is variance that tells you which one you are holding, and variance is therefore the more honest description of a session.

How volatility changes how long a balance lasts

Given a fixed bankroll and stake, higher volatility generally means a wider range of possible session lengths — a greater chance of a very short session, and a greater chance of an unusually long one. Lower volatility narrows the range toward something closer to the expected duration.

This is why the two levers that stretch a session are a smaller stake and a lower-volatility game. Neither touches the sign of the expected value — the edge still applies — but both change how the ride is distributed, which is usually what a player is actually choosing between.

It is worth saying plainly: making a session last longer is not the same as making it profitable. A longer session at a fixed edge is simply more rounds over which the same expected cost accrues, spread more gently.

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Knowing the maths is not the same as beating it

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