As architect of Texas A&M's Wrecking Crew defense (1989-93), Notre Dame defensive coordinator (1994-96) and head coach of the Irish (1997-2001), Bob Davie has been recognized as a top Xs and Os coach. This season, Coach Davie will analyze offensive and defensive schemes as part of his season-long course on football for ESPN.com. Each week, he will break out the chalkboard and break down the X's and O's in college football. If you have any questions after reading Football 101 or have a question about a specific term or scheme, send them our way and we'll give them to Coach Davie, who will answer a few in his weekly Football 101 feature.

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