Guide
Guide · 5 min read
A win does not make it a good bet
Most arguments about a bet mix up four different things. Pulling them apart is the most useful habit in betting, and the one touts most often blur.
The four numbers
One bet, four different questions
Chance: how often does this bet win? Say the market puts it at 53.0%.
Break-even: how often does it need to win? At $125 to win $100, that is 55.6%.
Expected return: what is it worth on average? 0.53 × $100 − 0.47 × $125 = −$5.74, or −4.6 cents per dollar.
Realized profit: what actually happened this time? Maybe +$100 or −$125.
Only the last one is what happened. The other three are what the bet was. A bet is judged by the first three. A result is just one draw from them.
A win on a bad-priced bet
Suppose that bet wins. You made $100. It feels great, and if a tout sold it to you, it feels like proof. But the bet had a negative expected return before the game started, and it still does. One win moves the realized profit. It does not move the expected return.
How long it takes for the average to show up
Make that same bet 100 times. The expected result is a loss of about $575. But results swing. You win about 53 times, give or take 5, and each win or loss is worth a lot of money. About 31 times out of 100, a bettor making 100 of these bets would finish ahead.
Finishing ahead on a bet that costs you on average does not mean the bet was good. It means luck was on your side for a while. Run the same bet a thousand times and the average wins out.
A loss on a good-priced bet
The same is true the other way. A bet priced better than fair can lose, even several times in a row, and still have been a good price. A pass on it can also be a mistake you will never know about, which is why the price, not the outcome, is the thing to check.
How the four get blurred
A tout who posts "5-0 this week" is showing realized profit and letting you read it as a chance. A tout who says "this is a 70% play" is quoting a chance without showing the break-even, so you cannot tell whether the price is worth it. A sales page that says "+30 units this season" shows realized profit over a stretch, which may be luck. None of these has to be a lie. Each one answers a different question from the one you are asking.
A habit that helps
Before you place a bet, write down three numbers: the break-even, the fair chance, and the expected return per dollar. After the game, write down what happened. Do not use the result to judge the bet. Use it to keep a running total.
After about fifty bets, compare the total expected return with the total you actually made or lost. If you are far above the expected total, you have been lucky or you have an edge, and fifty bets cannot tell you which. If you are far below, the same is true the other way. Keep going before you decide.
The fifth thing: confidence
Words like "lock", "max bet" and five stars describe how sure someone feels. They are not any of the four numbers above. KYT never converts them into odds.
Judge the bet by its price and its chance. Judge a run of results as luck until there are enough of them to say otherwise.
For entertainment and education. Nothing here predicts results or recommends a bet.