ACCA Boosts

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I often wonder why bookmakers take us all to be fools. Their latest strategy for manking loads of money is ACCA Boosts. They offer enhanced odds if you bet doubles, trebles or accumulators, namely ACCA boosts.

Assuming average overrounds of 15% per race, if you bet £1,000 in a race, you would expect to get back £850. This is what you would get back if you backed every horse, staking each one in proportion to their true probability of winning.

Now if you backed a double the expected return would be 0.85 × 0.85 × £1,000 = £723. The expected return for a treble would be 0 85 × 0 85 × 0.85 × £1,000 = £614. And so on.

The bookmakers wanting punters to bet on accumulators have come up with ‘odds boost’. The more selections you choose the greater the boost. So here is a summary of how it works:

No.of selections Boost % Expected Return
per £1,000 stake

2 2.5 £741
3 5.0 £645
4 7.5 £561
5 10.0 £488
6 12.5 £424
7 15.0 £368
8 20.0 £326
9 25.0 £289
10 30.0 £256
11 35.0 £225
12 40.0 £199

As can be seen, accumulators are a mugs game. The odds in favour of the bookmakers increase as the size of the accumulators goes up. I cannot believe many punters fall for this nonsense.

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