A little anecdote for your amusement (i hope its not considered spam):
I once played HoI2 with my bro. He was Germany, i was Italy. It was a two day session via LAN , with him sleeping over. On day 1 he didnt exactly overachieve with the frenchies almost steamrolling him until i gave him detailed advice not to try to hold a line against the broken-through french in the hinterland, but to cut them off instead. He then managed to take france out quickly. In the morning of day 2, i had to attend a class in Uni, so i was gone. When i came back home, i was happy finding him already sitting at the comp, having fired up the game (´wow - he is hot for it - good, so am i!´)... So we played on. In 1940 i was very pleased to see him steamrolling yoguslavia. I thought ´wow - he finally got the hang of it big time - this is going really fast - let´s see how he does economically. How many IC... hmmm 500 effective?! WHAT?!´ Then i noticed his vast amount of tank-divisions. I didnt even know about cheats back then. But that couldnt be right. I was like: ´there must be a bug somewhere. Your industry is way out of proportions - and you shouldnt be able to have built that many tanks by now´. Then his face turning redder than the soviet flag gave it away. Damn it! We were allies! There was no need to cheat! I acknowledge he had little experience with the game, and i would have probably agreed to allow him a minor boost - like 10% extra or something, had he asked. But instead he opted to search for cheats on the net, prior to the session and apply them secretly, rather than spending some time with the game to prepare. And then he totally overdid it, too, so i was bound to notice it sooner or later. And all that just to impress his little brother... tisktisktisk...