This reminds me of [1], where scratch-off games were founded to be using PRNG output improperly, allowing winning tickets to be identified without playing them.
“One would have to be brain-dead not to notice that the avalanche [in sales] had begun in the days leading up to the August 16th draw,’’ said Mohan Srivastava, a Canadian statistician who gained fame in gambling circles when he found a flaw in a Canadian instant game, allowing him to accurately pick winning tickets 90 percent of the time.