Problem Statement

Show a loop which prints random numbers (each number newly generated each loop) from 0 to 19 (inclusive). If a number is 10, stop the loop after printing it, and do not generate any further numbers.
Otherwise, generate and print a second random number before restarting the loop.
If the number 10 is never generated as the first number in a loop, loop forever.

Let's start with the solution:

while (1)
  a = random(20) - 1;
  player:tell(a);
  if (a == 10)
    break;
  endif
  b = random(20) - 1;
  player:tell(b);
endwhile