$228 million Mark Six snowball draw sparks online ‘tail-number’ theory

Hong Kong’s Mark Six lottery will mark its 50th anniversary with a special two-phase snowball draw, with the first draw scheduled for May 2. The estimated first-prize jackpot has reached HK$228 million, setting a record for a snowball prize.

The announcement by the Hong Kong Jockey Club has drawn public attention, with online discussions emerging about various number-selection theories ahead of the draw.

A self-proclaimed “Mark Six expert” has recently shared a so-called “tail-number theory” on social media, analyzing past results based on the last digit of winning numbers. The theory groups the 49 Mark Six numbers into 10 categories, from 0 to 9, according to their final digit.

The so-called “expert” claims that in each Mark Six draw, the seven winning numbers typically contain only four to five different last digits.

Based on this interpretation, the theory suggests that selecting all six numbers with different last digits may be unfavorable. For example, a ticket containing 01, 12, 23, 34, 45 and 46 would involve six entirely different last digits (1 to 6), which the theory argues is less likely to match past draw patterns.

However, there is no official evidence supporting such claims.

The post also outlines several informal “rules” based on perceived patterns in previous draws.

• Repeated tail numbers: Avoid tail digits that have appeared frequently in recent draws.
• Same-tail pairs: Numbers sharing the same last digit in one draw may be excluded in the next.
• Low-high mix: Combinations of very low (01–09) and very high numbers (41–49) are suggested to be avoided.
• Recent trends: Focus on tail numbers seen in recent draws, while excluding those absent for long periods.
• Mirror pairs: Mirror pairs group tail digits that add to 10 (e.g., 1–9, 2–8), forming five “shadow sibling” pairs: 01–09, 02–08, etc., plus 05–05. Based on draw sequence patterns, if 15 appears as the 2nd drawn number, then in the next draw, a number ending in 0 is unlikely to appear in the 2nd position.

The Hong Kong Jockey Club has previously stated that Mark Six draws are conducted under strict random procedures, with each number having an equal chance of being selected.