Old Man Pondering

Sixty-seven years ago my grandmother dealt me into my first hand of penny poker, and the itch never left. Every fall since I started this blog I’ve put out my NFL picks for the season, and I’ll say this: leaning on the numbers rather than the gut has kept me on the winning side of things eight out of the last nine years.

My concern lately is that AI handicapping tools will erode whatever advantage I’ve built up, given how many people are starting to lean on them. I did some digging into how one of these programs actually works, and found it treating things like 3rd down conversion rate as a cornerstone metric—which struck me as funny, considering Seattle sat at 19th in that column just last season. The way I see it, these tools are essentially laundering opinion as data, just at a scale that makes it look like something more.

Regular readers know I’ve spent years breaking down strategies to beat the sportsbook’s cut—the vig.

The Hidden Costs of Sports Betting: Unraveling the Vig – Old Man Pondering

This time around, I’ll start from the ground up: moneylines, point spreads, and how they translate to win probability. It might feel like second nature to a stats-obsessed mind like mine, but I know these concepts can tie newcomers in knots.

There’s no single right way to break down a game—some bettors live and die by trends, others by matchups or injury reports. My approach has always been to start with win probability and work outward from there, converting my estimates into the language of spreads and moneylines until I find a gap worth betting into. Tomorrow night’s Seahawks-Patriots opener is a useful illustration. I have Seattle at 63% to win the game. The book is currently offering Seattle -3.5 at -104, New England +3.5 at -118, a Seahawks moneyline at -176, and a Patriots moneyline at +148.

So, betting Seattle -3.5 means you lay $104 to win $100. Taking New England +3.5 requires $118 to win that same hundred. The straight moneyline on Seattle demands $176 for a $100 return, while backing New England outright pays $148 on a $100 wager. These are just the standard ratios—you can bet any amount, and the payout structure scales proportionally.

Let’s translate those moneylines into probabilities. For a favorite, you divide the moneyline by itself plus 100, then multiply by 100. So for Seattle at -176: (176 / (176 + 100)) * 100 ≈ 63.7%. Since my own estimate sits right at 63%, there’s no edge here—the house and I see eye to eye. No bet.

The Giants are my best bet this weekend. New York comes in as a +128 underdog, which the book is pricing at roughly 44% to win—but I have them at 63%, a gap wide enough to drive a truck through. Yep, John Harbaugh as the new coach and Jaxson Dart having a season under his belt, will make a difference. On the spread, I’ve got them winning by 4.5 points, and the book is spotting them 2.5, which means I’m picking up an extra two points of cushion on top of an already favorable line. When the numbers line up like that—edge on the moneyline and edge on the spread pointing the same direction—you pay attention.

Now, the Giants are an upset longshot—a bet you make with your head, not your chest. The Jaguars and Chargers are a different story. Jacksonville is sitting on a defensive line that has quietly become one of the better units in the league, and Los Angeles has a quarterback playing with something to prove. Both teams are being underpriced in ways the books will correct by next week. Get there first. Good luck.