A federal trial that could shape the future of gambling in Florida has begun as attorneys for the state and the Seminole Tribe accused the other side of reneging on its promises.

While the legal questions revolve around arcane federal and state gambling laws, the outcome could decide whether the tribe, which earns more than $2 billion a year from its gambling operations, will be allowed to keep blackjack tables at its casinos, including the Hard Rock casinos in Tampa and Hollywood in south Florida.