How to grade your own bets
What are the rules for settling your own betting record?
Settling your own record sounds clerical. It is where most self-reported edges are actually manufactured, and always by accident.
Never cross a line
A half point is not a rounding error. At -110 the price implies 52.38%; at -120 it implies 54.55%. That 2.16-point step is 0.45x the entire 4.76-point two-way margin you are trying to beat.
So a total and the same total a half point higher are different bets, and settling one against the other's result is not an approximation. It is the single most reliable way to turn a losing bet into a winning row.
Never mix books
Grade a bet against the book it was placed at. Two books can disagree about whether a market even resolved, and a record assembled from whichever source happened to be handy is a record of nothing in particular.
Never settle from a soft book alone
A soft book's number is a product being sold to you, not evidence about the world. It is a poor anchor for a fair value and a poor authority on a result.
Grade idempotently
Running the grader twice must not change a single number. If it does, the grader is writing rather than reading, and every figure downstream depends on how many times you happened to run it.
Pushes and voids are not wins and not losses
A push returns stake and belongs in neither column. Counting pushes as wins inflates a win rate; dropping them from the denominator inflates a return. Both are common, and a tracker that does not say which it does is not reporting a number you can use.