I found it:
http://www.finheaven.com/boardvb2/showthread.php?t=99384
"Anyone who has access to first half lines should look at this system carefully. It generally works much better in the first half than the game itself. The halftime margins can be astounding, and that has been the case for years. The teams in this negative scheduling situation come out amazingly flat. Look at this year: Seattle led 21-0 over Atlanta at half, Minnesota was ahead of New Orleans 24-0 at half, and San Francisco led Dallas big, 24-12. The 49ers lost in the final minute of the game after leading throughout. I had a brutal beat in the first half tonight. The Chargers led New York 21-3 in the middle of the 2nd quarter before a calamity of errors. New York kicked a last second FG to cut the margin to 21-20 at half, blowing my -3 in the first half. In this case that just ticked me off and I bet more on San Diego in the 2nd half."