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Implied probability translates a decimal price into a percentage using 1 / decimal odds x 100 . Odds of 2.00 imply 50%, 1.50 implies 66.67%, and 4.00 implies 25%. Those percentages reflect the price, not an objective chance, and a complete bookmaker market normally totals more than 100% because margin is embedded in the prices.
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Convert every decimal price in one complete market into implied probability, add those probabilities, then subtract 100%. For a three-way market priced at 2.10, 3.40 and 3.60, the total is 104.81%, so the displayed overround is 4.81%. That is a price comparison measure, not a forecast of who will win.
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Pre-match line movement is a change in odds or a handicap before the event starts. Read it as a timestamped market observation, not as a hidden prediction. A useful log records the opening quote, later quote, full market margin, source, rules and any verified news. Without those details, the direction alone is weak evidence.
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The Kelly formula estimates a bankroll fraction when you have a probability estimate and decimal odds: f = (b x p - q) / b , where b is odds minus one, p is your estimated win probability and q is one minus p. At odds 2.00 with p = 55%, full Kelly returns 10%. The result is extremely sensitive to an estimate that may be wrong.
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Odds drift means the available price on an outcome has become longer. A move from 2.00 to 2.40 changes the price-implied probability from 50% to 41.67%. It shows that the quote changed; it does not reveal one certain cause and it does not prove the outcome is now more or less likely in reality.
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