We can divide the two-color ball into large span, medium span and small span. The interval between two periods of basketball is more than 8 periods, which is called long span. For example, the blue ball in the 200806 1 issue of the two-color ball is 06, while the blue ball in the 2008062 issue is 15. The absolute value of the previous blue ball minus the next blue ball minus 1 is the required span, namely | 6- 15 |-6550. The interval between the upper and lower blue balls is 4-7, and the interval between the upper and lower blue balls is 0-3, which can be defined as medium span.

According to this calculation method, the span of the 2008055-068 two-color ball is: small-small-small-medium-large-small-small-medium. According to the statistics of span trend in 13 period, it can be found that the short span accounts for 9 periods, accounting for 69%. Mid-span accounts for 3 phases, accounting for 23%. Long span accounts for 1 period, accounting for 7%. ?

These lottery data tell us that the most blue balls are played in the range of 0-3! It is suggested that lottery players should pay attention to the selection of small-span blue balls, then consider the medium-span blue balls, and pay attention to the large-span when the large-span is skewed. For example, there are few large spans in the near future, and there are large spans in the later period of fortification.