Overlay and the guarantee arithmetic

Leg 01How a guaranteed prize pool is formed

In an ordinary tournament the prize pool is simply the buy-ins collected, minus the fee. A guaranteed tournament adds a promise: the pool will be at least a stated amount, however many players enter. The arithmetic of the promise is straightforward. The entrants contribute their buy-ins; the fee is taken by the room; the entrants’ contribution is the pool the field has funded. If that funded pool is at or above the guarantee, the guarantee is cosmetic — it simply confirms what the field paid. If it falls below, the room has to make up the difference.

Leg 02The overlay is the gap between the guarantee and the entries

When entries fall short, the shortfall is the overlay: the amount the room must add from its own funds so the prize pool reaches the promised figure. For the field, that means the prize pool is larger than the money the entrants actually put into it — the only structural situation in which a tournament pays out more than its players contributed. It happens when a guarantee is set optimistically, when a schedule has too many events competing for the same players, or when an event simply draws a smaller field than the room hoped.

Leg 03Why a room runs an event that can lose money

A guarantee is a promotion, and its cost is a marketing budget. A large guaranteed figure draws players who would not enter a smaller event, and those players also generate rake on the satellites and side events around the guarantee. Rooms price guarantees so that, averaged across a schedule, the surplus from well-attended events and the surrounding rake outweigh the overlays paid on the quiet ones. A single overlay is not a mistake by the room; it is the price of the advertising the guarantee bought, and a room that never paid an overlay would be setting guarantees so low they attracted no one.

Leg 04Overlay hunting, and its limits

Because an overlaid pool can be larger than the entrants funded, some players look specifically for guarantees likely to be missed — "overlay hunting" — on the reasoning that the field is getting more than it paid for. The reasoning is sound as far as it goes, but it has limits. A guarantee you think will be overlaid may fill at the last minute, especially with late registration, so the overlay you counted on can vanish; and the events most likely to overlay are often the softer, less-prestigious ones that attract the same overlay hunters. The overlay is a genuine structural advantage when it lands, and not a reliable plan.

• Late registration The field can grow after you commit; an overlay can close before it locks.
• Field quality The events most prone to overlay attract the players hunting the same edge.
• The fee still applies An overlay helps the pool; the fee is still charged to every entrant.
• A bigger pool, not a promise More money in the middle does not change your own chance of reaching it.

Leg 05How to judge whether a guarantee will hold

You cannot know the final field, but a guarantee can be read against what is knowable: the number of players the event has drawn before, how central it is to the schedule, how late registration stays open, and how the guarantee compares to similar events. An event that reliably fills is a normal event with a headline number; an event that reliably overlays is leaning on the room to subsidise it. Neither tells you the result, but both tell you what you are entering and whether the guarantee is a real offer or a decoration.