http://aushestov.ru/challenges-for-game-designers-%d0%b3%d0%bb%d0%b0%d0%b2%d0%b0-5-%d1%8d%d0%bb%d0%b5%d0%bc%d0%b5%d0%bd%d1%82-%d1%81%d0%bb%d1%83%d1%87%d0%b0%d0%b9%d0%bd%d0%be%d1%81%d1%82%d0%b8/
Challenges for Game Designers: Глава 5. Элемент случайности