Football accumulator tips

In a multiple, the bookmaker's margin compounds. If a single selection returns 94 per cent, a treble returns 0.94³ - about 83 per cent - and a five-fold about 73 per cent. Building an accumulator is therefore not a neutral choice but a systematic way of paying more margin.

There is an important exception: if every leg has positive expected value on its own, so does the combination. The expected value of a multiple is the product of the legs' expected values. Two tips at +3% each are worth roughly +6% together. The problem is not the multiple as such - it is the filler legs added to reach a bigger price, each of which eats the return.

So this site publishes selections, not slips. If you want to build a multiple, use only fixtures that carry a published tip, and remember that variance grows faster than return.

A price is not a probability. Odds of 2.00 imply 50 per cent, but the implied probabilities of all three outcomes sum to more than one hundred per cent - the excess is the bookmaker's margin. On mainstream football markets that margin typically runs from two to eight percentage points depending on the operator.

Expected value is (probability × price) − 1. If you rate a home win at 55% and the best available price is 1.95, expected value is 0.55 × 1.95 − 1 = +7.3%. The same view at 1.80 gives −1.0%: an identical opinion is a good bet at one price and a bad one at another. That is the whole of it - a view without a price is not a tip.

The Kelly criterion gives the mathematically optimal stake fraction when the probability is known exactly. In betting it never is, and Kelly is acutely sensitive to overestimation: a probability that is a few points too high turns full Kelly into a bankroll collapse during a bad run.

Quarter-Kelly is the practical compromise. It cuts volatility to a fraction while preserving most of the long-run growth. On this site the suggested stake is additionally capped between 0.5 and 3 per cent of bankroll, however good a selection looks.

• Define the bankroll in advance and keep it separate from other money.
• Use the same stake percentage regardless of how last week felt.
• Never raise the stake after a losing run. It is the most common single way to lose a bankroll even with positive expected value.

An accumulator - parlay in North America, a multiple in most of Europe - combines several selections into one bet where every leg must win. The price is the product of the legs, and so is the margin.

Selections on this site are 1X2 bets: home win, draw or away win on the 90-minute score. Goal totals, correct scores and player markets are not published, because no equally reliable market benchmark is available for them.