Taking advantage of City Starvation Bug should be forbidden in all tournaments and ranking games. You can detect it in Demography Screen.
Step 1 ) Normal situation, high population + low manuf. good value and population/crop yield indicator around 10K
Screen # one:

Step 2 ) Starting phase of the City Starvation Bug , Lower population + high manuf. good value and very low crop yield value
Screen # two:

Step 3 ) Final Evidence, Population around 1000 + high manuf. good value, population/manuf. good indicator higher than 20
Screen # three:

It is very easy to detect if cheater has only one city and if he is careless using all citizens as an unemployed hammers producers.
Pleas visit our forum for more info about CIV5 tournaments:
http://forum.civilization.org.pl/viewforum.php?f=319
Step 1 ) Normal situation, high population + low manuf. good value and population/crop yield indicator around 10K
Screen # one:

Step 2 ) Starting phase of the City Starvation Bug , Lower population + high manuf. good value and very low crop yield value
Screen # two:

Step 3 ) Final Evidence, Population around 1000 + high manuf. good value, population/manuf. good indicator higher than 20
Screen # three:

It is very easy to detect if cheater has only one city and if he is careless using all citizens as an unemployed hammers producers.
Pleas visit our forum for more info about CIV5 tournaments:
http://forum.civilization.org.pl/viewforum.php?f=319