Motion-blurred skater in a Philadelphia Flyers sweater
Breakdown · BOS at PHI

Flyers run the Bruins off the ice on the underlying numbers

The verdict · earned

The Flyers earned it — the game and the expected-goals battle both.

BOS 1 · PHI 3
◆ By the ModelJul 12, 4:49 AMxG: xgboost-0.758Edited for clarityDrafted from NHL play-by-play by Backcheck's model, worded for clarity by an AI editor that may not change a number. Nobody at Backcheck was at the rink. How this works

Boston's 1-3 loss conceals how thoroughly Philadelphia dominated the underlying game. The Bruins underperformed their expected goals by 1.37—a chasm suggesting the scoreboard underrepresented the disparity.

The underlying metrics were decisively one-sided. Philadelphia controlled 60% of 5v5 expected goals (3.57–2.37) and held a 5-2 advantage in high-danger chances. Boston generated 27 shot attempts to Philadelphia's 17, yet created only 40% of the expected goals—revealing a stark efficiency gap.

Quality separated the teams. Philadelphia's shots converted at 0.070 expected goals per attempt versus Boston's 0.042—nearly twice as efficient. That disparity showed in the high-danger zone: Philadelphia buried 40% of its chances (2/5), while Boston could not convert when it mattered.

Philadelphia's execution came from aggressive play, particularly on the rush. The Flyers scored twice on 19 rush chances—a lethality that exposed Boston's defensive gaps. Philadelphia also generated four rebound opportunities by crashing the net effectively.

D. Vladar (26/27 saves, 0.963 SV%) played 1.37 goals above expectation, reinforcing the team's dominance. J. Swayman (14/16, 0.875 SV%, +1.57 vs expected) played well for Boston, yet could not overcome the offensive drought. The Bruins scored once despite their goalie's above-average performance.

Philadelphia's three-goal margin understated the one-sided contest. Boston didn't lose because the team was cold—Boston lost because Philadelphia was ruthless in converting superior opportunities.

The breakdown in twelve frames

Swipe it

Every number is from this page
Final · Feb 28
BOS
1
PHI
3

Flyers run the Bruins off the ice on the underlying numbers

Chances 2.4 – 3.6Did they deserve it? →
Did they deserve it?

The Flyers earned this one.

Expected goals · chance value
BOS
2.37
PHI
3.57
40% of the chances60%

The board read BOS 1, PHI 3. The chances read BOS 2.4, PHI 3.6.

Our xG model · NHL play-by-play · all situations
Luck check
PHI
−0.6
goals above expected
PHI3.57 expected · 3 scored
Expected
Scored
BOS2.37 expected · 1 scored
Expected
Scored

Both sides finished close to what their chances were worth. This one was earned on the ice.

PDO = sh% + sv% · drifts to 1.000 over a season
Every goal, in order
  1. P3 03:41PHIT. Konecny0–1
  2. P3 11:55PHIJ. Drysdale0–2
  3. P3 13:03BOSC. McAvoy1–2
  4. P3 19:07PHIS. CouturierEN1–3
NHL play-by-play · chance value from our xG model
Where the shots came from
BOS
41 shots
1
Final
70 shots
PHI
29 shots
3
BOS attackPHI attack
BOS PHI Goal
41
shots · 1 in
29
shots · 3 in
Every unblocked shot · press play to replay it
Chances by danger
BOSPHI
0 / 2
0.44 xG
High danger
2 / 5
1.55 xG
1 / 12
1.33 xG
Medium
1 / 14
1.81 xG
0 / 42
0.60 xG
Low
0 / 32
0.22 xG

The Flyers buried 2 of 5 high-danger looks.

Danger tiers by our xG model · high ≥ 20% chance
In the net
A
J. Swayman
+1.6
BOS · 14/16
B+
D. Vladar
+1.4
PHI · 26/27
The numbers, checked
BACKCHECK

Flyers run the Bruins off the ice on the underlying numbers

A model, not a newsroom. Every number on these frames comes from the NHL's play-by-play and our own models. Nothing was watched, guessed or heard from anyone.

Read the full breakdown
backcheckreport.com
01 / 08 · Final
Every goal, in order

How it happened

NHL play-by-play
1stshots 6–7no goals
    2ndshots 16–3no goals
      3rdshots 5–7
      1. 03:41PHIT. Konecny(C. Dvorak, J. Drysdale)0–1
      2. 11:55PHIJ. Drysdale(T. Konecny, C. Dvorak)0–2
      3. 13:03BOSC. McAvoy(H. Lindholm, P. Zacha)1–2
      4. 19:07PHIS. Couturierempty net(N. Cates)1–3

      score reads BOS–PHI

      Source · NHL play-by-play (api-web.nhle.com)
      Process vs result

      The numbers

      XGBoost xG · NHL play-by-play
      3.57
      PHI chances
      Goals their shots were worth
      −0.6
      Finishing
      Goals below what those chances were worth
      1.041
      PHI puck luck
      Above 1.000 — the bounces went their way
      47.7%
      Shot attempts
      Under half — they were outshot
      Split by club

      Who controlled the game

      2.37Expected goals3.57
      PHI 60% of the chance quality
      27Shots on goal17
      2High-danger chances5
      56All attempts (Corsi)51
      Adjusted for score: BOS 53% · PHI 47%
      Faceoffs · PHI won33%off56%neu50%def
      Source · NHL play-by-play · XGBoost xG
      How the game was won

      The danger ladder

      shotsgoalsexpected
      High dangerslot & crease
      BOS0 / 2 · 0.44 xG
      PHI2 / 5 · 1.55 xG
      Medium dangermid-range
      BOS1 / 12 · 1.33 xG
      PHI1 / 14 · 1.81 xG
      Low dangerperimeter & point
      BOS0 / 42 · 0.60 xG
      PHI0 / 32 · 0.22 xG

      PHI went 1-for-14 from medium danger on 1.81 expected goals — 0.8 left on the table.

      Source · Backcheck xG model · NHL play-by-play
      The luck layer

      Finishing vs expected

      expectedactual
      BOS
      1 G · 2.37 xG · -1.4
      PHI
      3 G · 3.57 xG · -0.6
      01234

      BOS finished -1.4 against expected, PHI -0.6.

      Source · Backcheck xG model
      Shot types · rush and rebound chancesopen +
      What they shot — and what went in

      Shot diet

      goalsshots
      BOS
      SNAP0/26
      WRIST0/1
      BACKHAND0/5
      SLAP0/5
      TIP IN0/3
      DEFLECTED1/1
      WRAP AROUND0/0
      OTHER0/15
      PHI
      SNAP0/4
      WRIST3/15
      BACKHAND0/3
      SLAP0/2
      TIP IN0/3
      DEFLECTED0/1
      WRAP AROUND0/1
      OTHER0/22
      BOS
      PHI
      Off the rush
      0 G on 24
      1.50 xG
      2 G on 19
      2.01 xG
      Off rebounds
      0 G on 2
      0.39 xG
      0 G on 4
      0.64 xG

      Snap shots carried the volume: BOS went 0-for-26, PHI 0-for-4. PHI scored 2 of theirs off the rush.

      Source · Backcheck xG model · NHL shot types
      New to these numbers?

      Two things happened in this game: who created the better chances, and who put the puck in the net. They are not the same thing, and this page separates them on purpose.

      The one to watch is expected goals— the best single read on who deserved to win. When it disagrees with the scoreboard, that disagreement is usually the story. Nothing here is a projection; every figure is computed from this game's play-by-play. Full glossary →

      xG
      Expected goals. Every shot scored by how often that exact look goes in. 2.5 xG means the chances were worth about two and a half goals.
      HD
      High-danger chances — shots from the slot and the crease, where shots actually become goals.
      Corsi
      Every shot attempt, including the ones that missed or got blocked. A rough read on who had the puck.
      Adj.
      Score-adjusted. Teams that trail shoot more and teams that lead sit back, so this corrects the attempt count for the scoreboard.
      GSAx
      Goals saved above expected. A positive number means the goalie stopped more than an average goalie would have on those shots.
      PDO
      Shooting % plus save % — a luck gauge. It sits near 1.000 over a season, so a game far from it usually means the bounces decided it.
      Shot by shot

      In the net

      Graded on goals saved above expected
      J. Swayman
      BOS · 14/16 · .875
      +1.6
      saved above expected
      A
      the night
      By dangerG/attxGsaved
      High danger2/51.6-0.5
      Medium1/141.8+0.8
      Low0/320.2+0.2

      A+ ≥ +2.5 saved above expected · A ≥ +1.5 · B+ ≥ +0.75 · B ≥ +0.25 · C ≥ −0.25 · D ≥ −0.75 · F below −1.5

      D. Vladar
      PHI · 26/27 · .963
      +1.4
      saved above expected
      B+
      the night
      By dangerG/attxGsaved
      High danger0/20.4+0.4
      Medium1/121.3+0.3
      Low0/420.6+0.6

      A+ ≥ +2.5 saved above expected · A ≥ +1.5 · B+ ≥ +0.75 · B ≥ +0.25 · C ≥ −0.25 · D ≥ −0.75 · F below −1.5

      70 shots · press play to watch the game back

      Where the shots came from

      NHL play-by-play coordinates
      BOS
      41 shots
      1
      Final
      70 shots
      PHI
      29 shots
      3
      BOS attackPHI attack
      BOS PHI Goal

      Each club shoots toward its own end — BOS left, PHI right — the way you would watch it. A dot's size is how dangerous the look was, from distance and angle; it is a proxy for shot quality, not the xG model the article is written from. Hover a dot for the shooter and the clock.

      Ranked from the box score

      Three stars

      Points first
      Three stars · computed, not voted
      T. Konecny
      #11 · R · PHI
      1 G · 1 A · 4 SOG · 20:04 on ice · +2
      C. Dvorak
      #22 · C · PHI
      0 G · 2 A · 1 SOG · 19:21 on ice · +2
      J. Drysdale
      #9 · D · PHI
      1 G · 1 A · 1 SOG · 17:28 on ice
      Ranked from the box score — points first · Backcheck
      What the model said beforehand

      Before the game

      Written Sat, Feb 28
      Open the pre-game read
      Written from the numbers

      The read

      Edited for clarity
      ◆ By the ModelJul 12, 4:47 AMEdited for clarityDrafted from NHL play-by-play by Backcheck's model, worded for clarity by an AI editor that may not change a number. Nobody at Backcheck was at the rink. How this works

      Philadelphia has a 55% chance to win this, the model projecting a 2.3–2.6 game. This is about as close to even money as hockey gets.

      Boston has momentum. The Bruins are 6-1-3 over their last 10 games, while Philadelphia sits -7 on goal differential in the same span—results that trail the underlying play.

      The underlying play favors Philadelphia. The Flyers generate 51.0% of expected goals at 5-on-5 to Boston's 47.0%, indicating superior shot quality even as recent results have disappointed. Boston's Corsi rating of 49.0% trails Philadelphia's 48.0%, a narrow edge that reflects the Flyers' possession advantage.

      Boston's hot start masks vulnerability. The Bruins' PDO of 1.023 signals they're running hot on finishing and goaltending luck—regression is coming. Philadelphia's 1.008 suggests a more sustainable path.

      Goaltending carries uncertainty. Both S. Ersson and J. Korpisalo are on back-to-backs, creating the possibility of a backup appearance or a fatigued starter.

      Boston's offense runs through Viktor Arvidsson, operating at 1.04 expected goals per 60 minutes and 18 goals on 13.0% shooting—an unsustainably high rate. Tanner Jeannot (0.75 xG/60, 6 goals, 8.3% shooting) provides secondary support.

      Philadelphia counters with Owen Tippett (0.88 xG/60, 19 goals, 12.1% shooting) as its most consistent threat. Christian Dvorak (0.81 xG/60, 12 goals, 21 assists) rounds out the offensive core, though he represents Philadelphia's defensive liability.

      Both teams occupy the same tactical space: neither has converted in high-danger situations, with both sitting at 0% on hard-chance and rebound goals. Boston's defensive weak link is Elias Lindholm. In a game where process favors the visitor and momentum favors the home team, the model's split reflects the genuine toss-up underneath.

      What the model said beforehand

      The model's lean

      PHI 55%
      55%
      PHI
      Model favorite
      45%
      55%
      BOS50PHI

      PHI by 10 points of win probability — a modest lean. Projected score BOS 2.3–2.6 PHI; 19% chance it's tied after 60.

      Source · Backcheck Poisson projection · season scoring rates
      Season rates · 5v5

      Tale of the tape

      NHL stats API · our xG
      BOS← edge
      edge →PHI
      47.0%51.0%
      49.0%48.0%
      2.392.26
      2.672.20
      2.221.96
      1.821.82
      1.0231.008

      The season numbers split 3–3 — no clear process edge — and the luck row (1.023 vs 1.008) says BOS has been getting the bounces, which tends not to last.

      Source · NHL stats API + our xG · 5v5
      Form · Last 10
      BOS
      6-1-3
      +4 GD · 1d rest
      PHI
      3-4-3
      -7 GD · 1d rest
      1.023
      BOS PDO
      Luck gauge · drifts to 1.000
      1.008
      PHI PDO
      Luck gauge · drifts to 1.000
      What decides it

      Keys to the game

      Where the edges live
      • The Flyers own the underlying play — 51.0% 5v5 xG vs 47.0%.
      Regression watch
      • The Bruins' PDO is 1.023 — running hot, expect some regression.
      Things to watch
      • The Flyers own the underlying play — 51.0% 5v5 xG vs 47.0%.
      • S. Ersson is on a back-to-back — watch for a backup start or a tired starter.
      • J. Korpisalo is on a back-to-back — watch for a backup start or a tired starter.
      • The Bruins are the hotter team by points pace (6-1-3 in their last 10).
      • The Flyers are underwater at -7 goal differential over their last 10.
      • The Bruins' PDO is 1.023 — running hot, expect some regression.
      Last game's lineup · confirmed at warm-up

      Lineups

      NHL box score
      BOS
      Expected in goal
      J. Korpisalo
      back-to-back.947 last start
      Backup Jeremy Swayman · +28.8 GSAx this season
      Back-to-back: the backup often gets this one. Treat the starter as unconfirmed.

      No completed game on file for this club yet.

      PHI
      Expected in goal
      S. Ersson
      back-to-back.917 last start
      Backup Dan Vladar · +13.8 GSAx this season
      Back-to-back: the backup often gets this one. Treat the starter as unconfirmed.

      No completed game on file for this club yet.

      Lineups are the players who dressed in each club's last game, with their minutes; clubs confirm tonight's at warm-up. Every player this preview names was in that lineup.

      Computed danger · scouting

      Players to watch

      NHL stats API · our xG
      BOS
      Viktor Arvidsson18G 24A
      1.04 xG/60 · 2 HD · 13.0% sh
      Tanner Jeannot6G 14A
      0.75 xG/60 · 2 HD · 8.3% sh
      PHI
      Owen Tippett19G 18A
      0.88 xG/60 · 2 HD · 12.1% sh
      Christian Dvorak12G 21A
      0.81 xG/60 · 3 HD · 11.2% sh
      Keep going

      Where to next