All sorts of crazy shit would happen.

First off e4 and d4 would be banned for being over used and overcentralizing the metagame.

The queen would be banned easily. And there would be a queen metagame where all the bichops and knights and rooks where replaced with all queens.

Also there would be a UU metagame with all pawns and a king.

Draws would be made illegal and a macth would be decided on whom ever had to sleep first.

There would be constant flame wars debating if rocks are uber or not in the OU metagame being over used once the Queen in banned. But in the Uber metagame would be a piece of shit.