“Here’s how the lock works: The lock is a 4-digit combination lock, but each digit has 3/10 possible positions to unlock. The probability of getting the correct password in one attempt is 81/10000 = 0.81%. Mathematically, it takes 122 attempts to open. However, when using an exhaustive method, the probability follows a negative hypergeometric distribution (the probability decreases with each attempt). This achieves the effect of only being able to open it by luck. The game rules are as follows: Wrists and ankles are secured with leather restraint straps and locked. The key is placed in a lockbox. The lockbox is randomly dropped into any corner of the room. The girl must move to the lockbox, pick it up, and attempt to unlock it to obtain the key and escape. There is a 90-second time limit. If she fails, two more leather straps are added to the restraints. Round 1: Wrists are tied behind the back, ankles are together. Round 2: The model uses her plea opportunity, changing the wrists to a front binding. In addition to the ankles, a leather strap is added to each thigh and calf and locked. Round 3: Upper arm restraints are added and locked. Round 4: Both plea opportunities are used up. Wrists are returned to being tied behind the back, and two leather straps are added, one horizontally and one vertically, to cross-bind the wrists. Simultaneously, the thighs and calves are bound together with a long leather strap, preventing the legs from straightening, and locked in a bent-leg, four-horse-drawn-legs-like position. Round 5: Because the bent-leg restraints were broken in Round 4, a four-horse-drawn-legs restraint is added, connecting the hands and feet with a leather strap. The final “Four Horses Striking” pose was incredibly sexy; the girl struggled, her lower abdomen sticking out, her body tilted to the side and head tilted back—it had the feel of an extreme “Four Horses Striking” routine! However, it was just a regular “Four Horses Striking” pose, and the girl’s struggling movements were particularly impressive.”
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