What a 1.85 Price Actually Costs You

Divide one by the decimal price and you get the implied probability. 2.00 is 50 percent, 1.85 is 54.1 percent, 1.50 is 66.7 percent, 3.00 is 33.3 percent. That is the entire conversion.

Now do it for both sides of a real two-way market. Say a CS2 Bo3 is priced 1.85 and 1.95. One over 1.85 is 54.1 percent, one over 1.95 is 51.3 percent. Add them: 105.3 percent. The 5.3 percent above 100 is the bookmaker's cut, the overround, and it is the fee you pay on every single bet regardless of who wins.

That number is the most useful thing on the screen and almost nobody looks at it. On a mainstream CS2 match-winner line, a competitive book runs somewhere in the low single digits. Small esports, obscure leagues and in-play markets run considerably fatter, because they are harder to price and the book charges for the uncertainty. When someone tells you a niche market is soft, check the overround first. Half the time the "soft" line is just an expensive one.

The reason line shopping pays is now arithmetic rather than advice. Take the same outcome at 1.95 instead of 1.85 and you have moved the implied probability you are paying from 54.1 to 51.3 percent. Nothing about the match changed. You just bought the same event nearly three points cheaper.

None of this tells you who wins. Value means your own estimate of a team's chance is genuinely higher than the implied probability of the price on offer, and forming that estimate is the hard part that odds arithmetic cannot do for you. The arithmetic only stops you from paying too much for an opinion you already had.