My first post, checked (ab)(cd), (abc)d, and a(bcd) which I think covers the required combinations as long as the numbers and operator all rotate through all combinations.
If Jens did not include the random input check then I think that if the other checks pass the script is good. But since the random numbers are part of the test, all possible combination of 1-9 would need to be checked. Since we currently have no good method of independently varifying a given set of random numbers at test time we can not be sure if the test scripts correctly found no solution or simply did not find the solution do to short comings of the code.
I applaud Jens for the time he spends setting this up and do not believe that absolute perfection is a requirement for this level of competition. The discussions so far have been quite interesting.
[ 22. September 2002, 16:00: Message edited by: Howard Bullock ]
