How to fill out your Tournament Challenge Second Chance bracket - ESPN

The opening weekend wasn't as decimating to brackets as we've seen in past years. Sure we lost Auburn, Kentucky, Kansas and Baylor, but all the 1 and 2 seeds advanced to the Sweet 16 and we're poised for an epic few days of regional action this weekend.

In the meantime, why not try and get another opportunity at perfection!

ESPN's Tournament Challenge Second Chance brackets are live for both the men's and women's contests, and this time perfection is actually attainable.

Create up to 25 new men's brackets beginning at the Sweet 16 and compete for $50K in total prizes! Tournament Challenge Second Chance

We're down to the Sweet 16. It's even easier than filling out your full bracket with only 15 picks to make, the same as one region in a full bracket.

Former Villanova coach Jay Wright has said the NCAA Tournament was a series of three weekends, each with a two-game tournament. It helps a team prepare better for what's in front of them. A No. 1 seed doesn't need to focus on the No. 2 seed in its region initially, as they won't face off unless six different outcomes go a certain way. Three sites, three weekends; simply play the teams in front of you.

For the rest of us, filling out our brackets in March is a massive puzzle to be solved, with historical data and trends leading us a certain direction. The biggest dilemma we have is being forced to pick all three weekends at once, before the tournament even starts! That's why many brackets are busted in the opening weekend. So here's your shot at redemption.

There are 9,223,372,036,854,775,808 (read: 9.2 quintillion) different combinations for a 64-team bracket. Every single human on earth would have to fill out over a billion brackets each to cover all of those combinations.