Free testing · Real model boards · Graded in public · 18+ 18+ only. No guaranteed outcomes. Please bet responsibly.
Octopus builder

Build a multi-leg slip, with the maths shown

An Octopus slip stretches across several outcomes at once — each leg a tentacle. Add your legs below and we will show the combined price, the true probability of the whole thing landing, and where the legs work against each other.

Your legs

Fixtures are today's real matches from our data feed. Enter the price your bookmaker is showing for each selection.

Octopus slip

Combined odds
Potential return
Implied chance of landing
Worth understanding

What each extra tentacle costs you

Adding legs multiplies the price. It also multiplies the ways the slip can die.

Odds multiply, chances shrink

Six legs at 80% each look strong individually. Together they land roughly 26% of the time. The price rises because the probability falls — that is the entire trade.

The margin multiplies too

Every leg carries the bookmaker's margin. Stacking eight legs stacks eight margins, which is why long multis are the most profitable product on any betting site — for the bookmaker.

Same-match legs are correlated

Two selections from one fixture are not independent. Where we spot them on your slip, we flag it — the true probability differs from a simple multiplication.

Just for fun

Paul's daily pick

A nod to the famous octopus. This picks a fixture at random from today's card — it uses no data, no model and no judgement whatsoever.

Entertainment only — not a selection

Consulting the tank…

Paul has no access to form, injuries or prices. Anything he lands on is luck. Our actual selections are on the predictions page, with the reasoning attached.