The Philadelphia 76ers just did something I've never seen in 20 years of covering sports. They geofenced their own arena.

According to their official website, ticket sales for home playoff games against the New York Knicks are now restricted to "greater Philadelphia residents only." If you order tickets from outside that area? "Canceled without notice and refunds given."

Let me translate that for you: The Sixers are terrified of their own building being overrun by Knicks fans.

And you know what? They probably should be.

Anyone who's been to a Sixers-Knicks game in Philadelphia knows the deal. The Knicks fans travel like nobody else in the NBA. They're loud, they're everywhere, and they turn road games into home games. I've seen games at the Wells Fargo Center where it sounded like Madison Square Garden South.

But having to restrict ticket sales to your own fans? That's a tough look, Philly. That's essentially admitting your fanbase either can't or won't show up in the numbers you need when it matters most.

From a business standpoint, I get it. Home court advantage is real. When the other team's fans are chanting "Let's Go Knicks" during crucial possessions in your building, that's a problem. The Sixers want their players to hear Philly support, not New York bravado.

But this is also an admission of weakness. It's saying "We don't trust our own fans to buy up these tickets before Knicks fans do." It's saying "We're so worried about the optics of a Knicks takeover that we're willing to restrict sales and potentially leave money on the table."

Will it work? Maybe. The Sixers can verify addresses, credit card billing locations, all that. But dedicated Knicks fans will find ways around it - they always do. Get a friend in Philly to buy tickets. Use a Philly address for delivery. Where there's a will, there's a way.