Also the book "Gambling Scams" by Darwin Ortiz. As I recall, the techniques generally involve not making normal "fair" free-tumbling rolls, but constraining th

Also the book "Gambling Scams" by Darwin Ortiz. As I recall, the techniques generally involve not making normal "fair" free-tumbling rolls, but constraining the die movements somehow. Things like tossing them into a corner or making one of the pair spin flat, around only a vertical axis.