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Breakdown · PIT at BOS

Bruins shut out the Penguins, 1-0

The verdict · coin flip

The Bruins won a genuine coin flip — neither side controlled the run of play.

PIT 0 · BOS 1
◆ By the ModelJul 12, 12:18 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

Goaltending decided this game despite even underlying play. Expected goals split 2.88–2.87 — nearly identical. J. Korpisalo's +2.87 outperformance (1.000 SV%) determined the outcome. The Penguins accumulated 2.87 expected goals and scored zero.

Pittsburgh dominated shot volume (27 to 19 on net). High-danger chances finished even at three apiece. S. Skinner delivered a strong showing (0.947 SV%, +1.88 vs expected), but Korpisalo simply outperformed him.

V. Arvidsson's backhander from the doorstep (P1, 11:00) was the game's sole goal.

The breakdown in twelve frames

Swipe it

Every number is from this page
Final · Jan 11
PIT
0
BOS
1

Bruins shut out the Penguins, 1-0

Chances 2.9 – 2.9Did they deserve it? →
Did they deserve it?

Dead even on chances. The Bruins took it anyway.

Expected goals · chance value
PIT
2.87
BOS
2.88
50% of the chances50%

The board read PIT 0, BOS 1. The chances read PIT 2.9, BOS 2.9.

Our xG model · NHL play-by-play · all situations
Luck check
BOS
−1.9
goals above expected
BOS2.88 expected · 1 scored
Expected
Scored
PIT2.87 expected · 0 scored
Expected
Scored

The Penguins left 2.9 goals on the table against what their chances were worth.

PDO = sh% + sv% · drifts to 1.000 over a season
Every goal, in order
  1. P1 11:00BOSV. Arvidsson0–1
NHL play-by-play · chance value from our xG model
Where the shots came from
PIT
43 shots
0
Final
80 shots
BOS
37 shots
1
PIT attackBOS attack
PIT BOS Goal
43
shots · 0 in
37
shots · 1 in
Every unblocked shot · press play to replay it
Chances by danger
PITBOS
0 / 3
0.68 xG
High danger
0 / 3
0.72 xG
0 / 13
1.60 xG
Medium
1 / 16
1.60 xG
0 / 46
0.59 xG
Low
0 / 37
0.56 xG

The Penguins went 0 for 3 from the slot.

Danger tiers by our xG model · high ≥ 20% chance
In the net
A+
J. Korpisalo
+2.9
BOS · 27/27
A
S. Skinner
+1.9
PIT · 18/19
The numbers, checked
BACKCHECK

Bruins shut out the Penguins, 1-0

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 10–10
  1. 11:00BOSV. Arvidsson(H. Jokiharju, C. Mittelstadt)0–1
2ndshots 10–5no goals
    3rdshots 7–4no goals

      score reads PIT–BOS

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

      The numbers

      XGBoost xG · NHL play-by-play
      2.88
      BOS chances
      Goals their shots were worth
      −1.9
      Finishing
      Goals below what those chances were worth
      1.018
      BOS puck luck
      About 1.000 — a normal night for bounces
      47.5%
      Shot attempts
      Under half — they were outshot
      Split by club

      Who controlled the game

      2.87Expected goals2.88
      BOS 50% of the chance quality
      27Shots on goal19
      3High-danger chances3
      62All attempts (Corsi)56
      Adjusted for score: PIT 56% · BOS 44%
      Faceoffs · BOS won59%off36%neu71%def
      Source · NHL play-by-play · XGBoost xG
      How the game was won

      The danger ladder

      shotsgoalsexpected
      High dangerslot & crease
      PIT0 / 3 · 0.68 xG
      BOS0 / 3 · 0.72 xG
      Medium dangermid-range
      PIT0 / 13 · 1.60 xG
      BOS1 / 16 · 1.60 xG
      Low dangerperimeter & point
      PIT0 / 46 · 0.59 xG
      BOS0 / 37 · 0.56 xG

      PIT went 0-for-13 from medium danger on 1.60 expected goals — 1.6 left on the table.

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

      Finishing vs expected

      expectedactual
      PIT
      0 G · 2.87 xG · -2.9
      BOS
      1 G · 2.88 xG · -1.9
      01234

      PIT finished -2.9 against expected, BOS -1.9.

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

      Shot diet

      goalsshots
      PIT
      WRIST0/23
      TIP IN0/7
      SLAP0/4
      SNAP0/4
      BACKHAND0/5
      OTHER0/19
      BOS
      WRIST0/17
      TIP IN0/5
      SLAP0/7
      SNAP0/5
      BACKHAND1/3
      OTHER0/19
      PIT
      BOS
      Off the rush
      0 G on 26
      2.04 xG
      0 G on 24
      2.12 xG
      Off rebounds
      0 G on 4
      0.54 xG
      1 G on 1
      0.08 xG

      Wrist shots carried the volume: PIT went 0-for-23, BOS 0-for-17.

      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
      S. Skinner
      PIT · 18/19 · .947
      +1.9
      saved above expected
      A
      the night
      By dangerG/attxGsaved
      High danger0/30.7+0.7
      Medium1/161.6+0.6
      Low0/370.6+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

      J. Korpisalo
      BOS · 27/27 · 1.000
      +2.9
      saved above expected
      A+
      the night
      By dangerG/attxGsaved
      High danger0/30.7+0.7
      Medium0/131.6+1.6
      Low0/460.6+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

      80 shots · press play to watch the game back

      Where the shots came from

      NHL play-by-play coordinates
      PIT
      43 shots
      0
      Final
      80 shots
      BOS
      37 shots
      1
      PIT attackBOS attack
      PIT BOS Goal

      Each club shoots toward its own end — PIT left, BOS 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
      H. Jokiharju
      #20 · D · BOS
      0 G · 1 A · 1 SOG · 20:43 on ice · +1
      V. Arvidsson
      #71 · L · BOS
      1 G · 0 A · 1 SOG · 16:46 on ice · +1
      C. Mittelstadt
      #11 · C · BOS
      0 G · 1 A · 0 SOG · 15:59 on ice · +1
      Ranked from the box score — points first · Backcheck
      What the model said beforehand

      Before the game

      Written Sun, Jan 11
      Open the pre-game read
      Written from the numbers

      The read

      Edited for clarity
      ◆ By the ModelJul 12, 12:17 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

      The model projects a 2.7-2.6 Penguins victory with Pittsburgh at 51% win probability. This is as close to a pick'em as you'll find.

      Pittsburgh owns the underlying play. The Penguins generate 51.0% of expected goals at 5v5 while Boston musters 47.0%, and they edge the Corsi battle 50.0% to 49.0%. But Boston's PDO sits at 1.023—running hot—while Pittsburgh's is a more modest 1.012. Expect some regression from the Bruins.

      The goaltending situation clouds things. J. Swayman faces a back-to-back and may yield to a backup, or start fatigued. A. Silovs is in the same bind. Whichever starter gets the nod will affect this razor-thin margin.

      For Pittsburgh, Rickard Rakell carries 13 goals and a 12.1% shooting rate at 1.01 xG/60—a threat to neutralize. The Penguins' weaknesses are structural: Filip Hallander (1.28 xG/60, 0G 3A) was recalled from his AHL conditioning loan for further evaluation, but Caleb Jones represents a softer defensive link that Boston's offense can exploit. Pittsburgh scores at 0% from high-danger areas and 0% on rebounds, a concerning sign for offensive efficiency.

      Boston counters with Viktor Arvidsson (18G 24A, 1.04 xG/60) and his 13.0% shooting rate—expect Pittsburgh's defense to key on him. Tanner Jeannot adds secondary punch at 0.75 xG/60 with six goals and an 8.3% shooting rate. Like Pittsburgh, Boston scores at 0% from high-danger areas and 0% on rebounds, limiting ceiling regardless of outcome. Elias Lindholm is Boston's defensive weak link.

      With both teams' PDOs skewed, underlying possession slight in Pittsburgh's favor, and goaltending uncertainty on both sides, neither team has clear advantage. The Penguins' edge in expected goals is real but slender, and a hot-running Bruins roster playing at home could easily flip this.

      The value sits in accepting the uncertainty: This is a toss-up, and the model knows it.

      What the model said beforehand

      The model's lean

      PIT 51%
      51%
      PIT
      Model favorite
      51%
      49%
      PIT50BOS

      PIT by 2 points of win probability — effectively a coin flip. Projected score PIT 2.7–2.6 BOS; 18% 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
      PIT← edge
      edge →BOS
      51.0%47.0%
      50.0%49.0%
      2.662.39
      2.552.67
      2.452.22
      2.121.82
      1.0121.023

      PIT holds 5 of 6 process categories — and the luck row (1.012 vs 1.023) says BOS has been getting the bounces, which tends not to last.

      Source · NHL stats API + our xG · 5v5
      Form · Last 10
      PIT
      7-3-0
      +9 GD · 1d rest
      BOS
      4-4-2
      +0 GD · 1d rest
      1.012
      PIT PDO
      Luck gauge · drifts to 1.000
      1.023
      BOS PDO
      Luck gauge · drifts to 1.000
      What decides it

      Keys to the game

      Where the edges live
      • The Penguins 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 Penguins own the underlying play — 51.0% 5v5 xG vs 47.0%.
      • J. Swayman is on a back-to-back — watch for a backup start or a tired starter.
      • A. Silovs is on a back-to-back — watch for a backup start or a tired starter.
      • The Bruins' PDO is 1.023 — running hot, expect some regression.
      Last game's lineup · confirmed at warm-up

      Lineups

      NHL box score
      PIT
      Expected in goal
      A. Silovs
      back-to-back.920 last start
      Backup Stuart Skinner · +8.3 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.

      BOS
      Expected in goal
      J. Swayman
      back-to-back.931 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.

      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
      PIT
      Filip Hallander0G 3A
      1.28 xG/60 · 0 HD · 0.0% sh
      Rickard Rakell13G 13A
      1.01 xG/60 · 3 HD · 12.1% sh
      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
      Keep going

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