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How accurate are the World Grand Prix odds?

The closing prices of 178 finished games since Sun 3 Oct 2021, set against what happened: the chance the market gave, with the bookmakers' margin removed, next to how often it came in. A record of what the market did, not a tip.

The market's record

178 games, 2 bookmakers
  • Closing favourite won 67% 119 of 178 games
  • Market Brier score 0.439 0 is perfect; a coin flip scores 0.500
  • Average closing payout 95.4% 100% minus the bookmakers' margin
  • Games covered 178 Sun 3 Oct 2021 to Sun 4 Oct 2026

2 of the 180 games finished in that time are left out: no bookmaker had a closing price on every outcome.

Market chance against what happened

20-30% chance: happened 25.0% of 36 selections 30-40% chance: happened 45.5% of 66 selections 40-50% chance: happened 29.1% of 55 selections 50-60% chance: happened 70.2% of 57 selections 60-70% chance: happened 54.5% of 66 selections 70-80% chance: happened 75.0% of 36 selections 100% 0%
Market said 0%100%
Happened
Market chancePriceSelectionsMarket saidHappenedDiff
20-30% 3.33 to 5.00 36 25.3% 25.0% -0.3 pts
30-40% 2.50 to 3.33 66 35.6% 45.5% +9.9 pts
40-50% 2.00 to 2.50 55 45.0% 29.1% -15.9 pts
50-60% 1.67 to 2.00 57 54.8% 70.2% +15.4 pts
60-70% 1.43 to 1.67 66 64.4% 54.5% -9.9 pts
70-80% 1.25 to 1.43 36 74.7% 75.0% +0.3 pts

Every priced outcome of every game is one selection. "Market said" is the bookmakers' average implied probability with the margin removed; "Happened" is how often that outcome came in. On the diagonal the market was right on average; above it, that kind of result happened more often than the prices said. Bands with fewer than 30 selections are left out.

Home, away

OutcomeMarket saidHappenedDiff
Home win 56.5% 57.3% +0.8 pts
Away win 43.5% 42.7% -0.8 pts

The market's average closing chance for each outcome over all 178 games against the share of games it won. "Home" is the first-named side.

Bookmaker accuracy

lower is better
BookmakerGamesBrier scorevs market averagePayout
Unibet 131 0.442 -0.001 95.5%
Bet365 116 0.450 +0.006 95.0%

Each bookmaker's own closing prices, margin removed, scored against the results of the games it priced; "vs market average" compares it with the bookmakers' average on the same games, so a negative figure means its prices were the closer. Bookmakers with fewer than 50 priced games are left out. Differences of a few thousandths are noise; a much higher score usually means the bookmaker's last price was captured well before the start, so it is the price in our archive being scored, not the trader.

Odds accuracy FAQ

How accurate are World Grand Prix odds?
Across 178 finished World Grand Prix games since 2021, the closing favourite won 67% of the time. The market's closing chance, with the bookmakers' margin removed, gave the home side 56.5% on average and home wins happened 57.3% of the time. The bands above show the same comparison price by price: a well-calibrated market has outcomes happening about as often as its prices say.
What is a Brier score?
The squared distance between the chances a bookmaker's prices gave and what happened, averaged over games: 0 would be perfect foresight, and on a three-way market a coin-flip price scores 0.667. The market average's closing prices score 0.439 in this league; the lowest single bookmaker is Unibet at 0.442. Differences of a few thousandths between bookmakers are noise, not skill.
Does a well-calibrated market mean the odds cannot be beaten?
Calibration says the market is right on average, not on every game. A band where outcomes happened more often than the prices said is where the closing market under-priced that kind of result over these seasons. The bookmaker's margin, about 4.6% here, still has to be cleared: the closing line value calculator shows what a price needs to beat.

See the league's fixtures, results and the favourites' recent record on the World Grand Prix page, every game behind these figures in the World Grand Prix results and closing odds by season, or work out a price's implied chance and closing line value with the betting calculators.