Expected goals predicted a close game. Boston 3.08, Chicago 2.60. The 5-2 scoreline disagreed.

Goaltending variance drove the gap. A. Soderblom (Chicago) allowed 1.92 more goals than expected, finishing 18/23 with a 0.783 save percentage. J. Korpisalo (Boston) moved in the opposite direction: 22/24 saves, 0.917 save percentage, +0.60 versus expectation. Boston overperformed their xG by 1.92 overall.

The chance quality barely differed. High-danger splits went 5–6, and Boston's xG per shot (0.064) beat Chicago's (0.046). But execution diverged sharply. Chicago scored zero goals on five high-danger chances. Korpisalo saved all five high-danger shots he faced. Boston also scored twice from low-danger areas.

Rush-chance shooting mirrored the pattern: Chicago 2 goals on 25 attempts, Boston 4 on 25. That's the story when underlying metrics suggested parity.

The third period turned on Marat Khusnutdinov's snap shot from the slot.

The model backs the headline: Boston gets 2.7 expected goals to Chicago's 2.5, and the Bruins earn just 52% win probability—the thinnest possible edge.

Boston owns the underlying play. The Bruins generate 47.0% of shot quality at 5v5 and control 49.0% of shot volume (Corsi), compared to Chicago's 42.0% and 46.0% respectively. They should win this game in a vacuum.

But the Bruins' PDO of 1.023 is a flashing warning. They're converting at 2.7 percentage points above the long-term average—unsustainable luck that will regress. Chicago, running at 0.996, sits right on the line between normal and cold. That PDO gap is the entire reason this game isn't a Bruins W.

Watch the goaltending situation. Both S. Knight and J. Swayman are on back-to-backs, which often means backup play or tired starters. Whichever team gets fresher goaltending gains an edge the underlying metrics miss.

Players to Watch

Boston: Viktor Arvidsson (1.04 xG/60, 18G, 2 HD goals, 13.0% shooting), Tanner Jeannot (0.75 xG/60, 6G, 2 HD goals, 8.3% shooting)

Chicago: Tyler Bertuzzi (0.85 xG/60, 20G, 7 HD goals, 18.0% shooting), Connor Bedard (0.82 xG/60, 17G, 5 HD goals, 11.8% shooting)

Chicago's path is to exploit Boston's defensive weak link, Elias Lindholm, and cash in on high-danger chances. Boston's path is symmetrical—target Anton Frondell and force mistakes on Chicago's back end. Arvidsson and Bertuzzi, both elite finishers, will determine whether the better underlying play translates to two points or none.

The projection says pick a side at random. The PDO discrepancy suggests Boston at a discount. But on a back-to-back goaltending day, discount enough.