Bill Belichick will compare gray matter with Mike Zimmer and Norv Turner on Sunday.
We haven't seen a clash of neurons this intriguing in decades.
Maybe you have to go back to the late '80s and early '90s, when Tom Kelly and Tony La Russa would turn games between the Twins and A's into treatises on intricate baseball strategy, both making moves in the sixth inning while eyeing the guy at the end of the bench who could win the game in the ninth.
Maybe you only have to go back to the mid-'90s, when Tony Dungy's defenses tried to stop Mike Holmgren and Brett Favre.
In the Vikings' Week 1 victory at St. Louis, Zimmer and Turner produced the first Vikings victory directly attributable to coaching in a long time.
Turner, the Vikings offensive coordinator, minimized the effectiveness of the Rams' strong front seven, and used unusual, inside play fakes to Adrian Peterson in the red zone to create openings for Matt Cassel's two touchdown passes.
Zimmer, the Vikings head coach and de facto defensive coordinator, confused the Rams' offensive line, helping his defensive front stuff the run and pressure the quarterback.
The result was a 34-6 victory over a team favored by Las Vegas.