Betfair Trading Isn’t Random

Every year around the time of the Cheltenham Festival, you will hear a familiar argument about traading on betting exchanges.

People say you cannot predict where prices are going to move. It’s impossible.

They claim that trading on a betting exchange is essentially random. If a price can move either up or down, then surely it must be a 50/50 coin flip. And if that were true, nobody could consistently make money from trading because the outcome would be entirely down to luck.

It sounds convincing on the surface.

But the reality of how markets behave tells a very different story.

Let us look at a simple example from the Cheltenham Festival.

The Cheltenham Challenge: Winning on All 28 Races

The Cheltenham Festival consists of 28 races across four days.

Way back in 2006 was the first time that I won every single race at Cheltenham, and the last time was last year

Now consider the common criticism that price movement is random. If that were true, then every trade would effectively be a 50/50 chance.

Under that assumption, the probability of winning on all 28 races becomes easy to calculate.

The chance of success on each race would be:

0.5

So the probability of winning 28 races in a row would be:

0.5^28

Which equals:

1 in 268435456

In other words, if trading outcomes were purely random, the odds of achieving that result would be roughly one in 268 million.

Two Years in a Row?

Now take that one step further. Last year was my second year in a row of winning on every single race.

That would be 56 consecutive successful trades. Though I note that Cross Country was not run in 2004, so technically it’s 55 races.

The probability under a random 50/50 model would be:

0.5^56

Which is approximately:

1 in 72,057,594,037,927,900

That is around 72 quadrillion to one.

To put that into context, the chances are astronomically small.

So What Is Actually Happening?

Clearly, betting markets are not random coin flips.

Prices move for reasons.

Information enters the market constantly. Money arrives from professional bettors. Trainers are backed heavily when confidence is high. Horses drift when something looks wrong in the preliminaries. Jockey bookings influence opinion. Weather conditions change expectations.

All of these factors create predictable pressure on prices.

Evidence in Plain Sight: Gambles and Drifters

If betting markets were truly random, then certain very familiar patterns would not exist.

Yet they appear every single day.

You regularly see:

Trainer gambles, where a horse is heavily backed from a much bigger price
Market support for certain jockey bookings
Late drifts when a horse looks unsettled in the paddock
Stable money arriving close to the off

These are not random events.

They are market participants acting on information.

And when that information enters the market, prices move in predictable directions.

Why Experience Matters

The difference between a casual observer and an experienced trader is not luck.

It is pattern recognition.

I have spent years watching markets begin to recognise behaviour. They can see when money is genuine. You can spot when a move is likely to continue. You can detect when a price move is running out of momentum.

This is exactly the same principle that applies in financial markets.

Nobody claims that stock prices are random simply because they move up and down. Traders analyse order flow, liquidity, sentiment and market structure.

Betting exchanges operate in a very similar way.

The Cheltenham Example Makes the Point

If trading results were purely random, then someone winning on all 28 races at Cheltenham would be essentially impossible.

The mathematical probability under a random model is around 1 in 268 million.

But you can clearly see that I have regularly produced long winning sequences because I am not relying on luck.

I am reading the market, and my favourite way of reading the market is to look at order flow, to look at the way that orders are arriving in the market and how they’re shaping the price.