[рони]

j0hnik,

var guess = function() {
    var b = Math.random,
        a;
    Math.random = function() {
        a = b();
        guess = Math.floor(100 * a + 1);
        return a
    }
}();

console.log(Math.floor(Math.random() * 100 + 1) == guess);// проверка
console.log(Math.floor(Math.random() * 100 + 1) == guess);// проверка
console.log(Math.floor(Math.random() * 100 + 1) == guess);// проверка