Peter Mucha, "Lottery legend Joan Ginther bet flabbering sums on scratch-offs", philly.com 7/6/2014:
For years, people who dream of beating the lottery have puzzled over the amazing case of Joan Ginther, who made headlines around the world by scratching off “10MILL” on a $50 instant ticket in June 2010 to win her fourth multimillion-dollar prize.
Skeptics wondered if she cheated or had an ingenious system for pinpointing winners. After all, Ginther received a Ph.D. from Stanford and has lived for years in Las Vegas. News reports at the time, citing mathematicians, fueled the fire: They put Ginther's chances of four such wins at 1 in 18 septillion. Remarkably, all four of her winners were purchased in or near her tiny hometown of Bishop, Texas. […]
Finally, answers have been found.
A series of discoveries based on painstaking analysis by Philly.com of newly obtained Texas Lottery records, with the help of experts, has led to a surprising conclusion: Basic gambling principles — like card counting in blackjack, money management in poker, and timing in progressive slots — may have inspired Joan Ginther to buy a flabbergasting number of $20 to $50 tickets, perhaps 80,000 worth $2.5 million or more.