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Generally, a post that wins is (when not a cheat or tip), informative, contains personal opinion and says something.
Just read back over a few and see, although it really is down to whoever decides for the day.
I know it can get frustrating, but the usual message is
"Post because you want to, not to win".
Just post away, have fun and if you win, power to you.
the '4 winners on one day' is because Special Reserve keep setting up extra prizes for special things. There is only one real Gameaday winner every day, the extras are for those who want to win but not enjoy the board (in my opinion anyway)