Questions about pool betting, answered from the mechanism

§1Who am I actually betting against?

You are betting against everyone else in the same pool. Your stake joins a common pot; if your selection wins you are paid out of the whole net pool, in proportion to the money that was staked on your selection. There is no single counterparty, no matched trade between two users, and no operator taking the other side of your bet for its own account.

The practical consequence is on the page on how a pool forms: the operator has taken no position on your bet, which is why it has no reason to refuse it for price reasons and every reason to collect its fixed percentage of it.

§2Why is no price quoted when I place the bet?

Because the dividend is derived from the pool and the pool is still open. The dividend on a winning selection is the net pool divided by the money staked on it, and neither figure is final until the pool closes. A number on a board during betting is a calculation from the ledger at that moment, not a price anyone has committed to.

§3Is the take the same for every pool type?

No. Take rates are set by the operator under the rules of the pool and, in most jurisdictions, within a regulatory cap. Win, place, exotic and multi-leg pools are commonly charged at different rates, with the composite pools charged more. What does not vary is the proportional effect inside a pool: the same fraction is removed from every winning dividend in it.

§4Does the take cost more than the percentage suggests?

As a share of the money staked in the pool, yes — because the dividend is what remains after the take is removed. A take of 17.5 per cent leaves 82.5 per cent of the pool to be paid out, which is the equivalent of a book carrying an overround of about 21.2 per cent. The table on the page on the take works this through for several rates.

§5What does late money do to the dividend I will be paid?

Money arriving on your selection lowers its dividend, because the net pool is divided by the money on that selection. Money arriving on other selections raises it, because the net pool grows and the denominator does not. The two are not equal: the ratio of one unit arriving elsewhere to one unit arriving on your own selection is roughly the money outside your selection divided by the money inside it.

Worked numbers for both directions, and for what your own stake does to you, are on the page on late money and dilution.

§6Does my own stake change my own dividend?

Yes. Your stake is money on your own selection, and the money on your selection is the denominator of your dividend. Against a quarter of a million that is negligible; against a thin pool it is not, and the effect grows with the stake.

§7What does a guaranteed pool guarantee?

A minimum amount of money in the pool, and nothing else. If public stakes fall short, the operator contributes the difference, which raises the prize a winning ticket receives in an under-subscribed pool. It does not guarantee a dividend, a return or a profit; it does not change the take or the conditions; and a losing ticket is still paid nothing. Jackpots and carried-over pools are different arrangements again, and the page on guarantees and carryovers separates them.

§8Can I sell a pool ticket back before settlement?

Normally not. A pool ticket is not transferable and there is no order book to cross it against. An operator may choose to make a buy-back offer on its own terms and at its own price, subject to its own suspension rules, but that is a commercial decision rather than a feature of the pool. A stake in a pool should be treated as committed for the life of the pool.