Thanks for your thoughts, Olivier and Mayhem. My intention was a fair and exciting contest that keeps people busy for several days; this is why I had the rules. A really good score is a mixture of luck and skills, but skills improve over the time and I'd say that a really good Shifted player can play any score he likes at any time he likes. This is even the reason why there is a highscore limit of 50.000 points (perhaps I should remove that rule, too).
Several people broke the rules so my decision was to make rules simpler rather than to tell these people off. Perhaps a wrong decision, but the decision is made. I guess the contest will be still interesting and I'm happy that by now there are seven contestants, which may look not that much but is a considerable number for a game that is a bit of an outsider. :-)