Comparing the latest odds with the peak period odds of the match(5 hours before the kick-off time), any of win/draw/loss odds changes abnormally.
Low Probability: Single
When the success rate prediction of removing low-probability option exceeding 75%, and the 99s odds of the low-probability option rising less than 10% higher than the initial odds, the pre- warning will be triggered.
Low Probability: Double
When the success rate prediction of removing double low-probability option exceeding 65%, the pre-warning will be triggered.