Scouting report: Jonathan Westerberg (GM, SWE)

901 over-the-board games in the Chess Stalker database (870 classical, 29 rapid, 2 blitz): 46% wins, 35% draws, 19% losses. FIDE rating 2452 standard, 2426 rapid, 2462 blitz. 169 games analyzed with Stockfish: 93% accuracy, 0.06 blunders per game.

  • Opening repertoire of Jonathan Westerberg as White and Black, with results per line — free.
  • Weaknesses and blunder patterns, evaluated with Stockfish — free.
  • Recent over-the-board games and endgame statistics.
  • Twin Bot: a sparring bot that imitates Jonathan Westerberg's style so you can rehearse the matchup — free online.

Full report: https://chessstalker.com/fide/1701754 — no account needed.

Chess Stalker

Jonathan Westerberg

GM

Swedenborn 1994FIDE ID 1701754

Rating & statistics

FIDE rating lists · Sep 2023 – Sep 2026
2400
2440
2480
2476 · Sep 2023
Oct
2024
Apr
Jul
Oct
2025
Apr
Jul
Oct
2026
Apr
Jul
Oct
Sep 2023Oct 2026
2462
2452
2426
2557peak, Nov 2019
901games
410wins, 46%
317draws, 35%
174losses, 19%

Play style

before facing them
Elite accuracy: 93.1% average
High resilience (58%): Dangerous even when losing
Very consistent (92%)
Very precise: only 0.1 blunders/game
Dominates 1.e4 as ♔ (70% in 292 games)

Play against Westerberg's Twin

Their real openings, level & style

Based on 901 games

Openings

901 games

Weaknesses

where they slip as ♔ White

No significant weaknesses detected as white

Strengths

what holds up for them as ♔ White
Four Knights1.e4 e5 2.♞f3 ♞c6 3.♞c3 ♞f617 games, last played last year88.2%wins
Sicilian: Closed1.e4 c5 2.♞c3 ♞c619 games, last played 4 years ago63.2%wins

Deep analysis

Stockfish · Classical · 169 analyzed
Accuracy by phase
Opening
95.2%
Middlegame
93.4%
Endgame
95.3%
Clutch factor
+4%
Winning (+2)
94%
Equal
94%
Losing (−2)
90%
Problematic pieces
28%
46 err
20%
33 err
16%
26 err
14%
23 err
12%
20 err
9%
14 err
Critical moment
Move 45 avg
0%
1-15
0%
16-25
30%
26-35
40%
36-45
30%
46+
40% of blunders occur after move 36-45. Keep tension until then.
Error heatmap · Critical squares
7
7
8
Few
Many
d4
8
d7
7
e5
7
f4
6
f5
6
d4/d7 concentrate most errors. Force decisions in those zones.

Critical blunders

10 errors
#37
♞xf3?? vs Kucuksari
Middlegame · OTB · 2025
#48
♛e1+?? vs Livner
Endgame · OTB · 2025
#59
♚e6?? vs Evertsson
Endgame · OTB · 2025
#20
♛d5?? vs Ivarsson
Middlegame · OTB · 2025
#40
♛xa4?? vs Miezis
Endgame · OTB · 2024
#42
g4?? vs Hellers
Endgame · OTB · 2024

Recent games

Galperin, Platon(2502)

Swedish Team Championship Elitse... · 8 Mar 2026

0–1
Lindberg, Bengt(1524)

Swedish Team Championships 2025 ... · 7 Mar 2026

½–½
Olsson, William(2385)

Swedish Team Championships 2025 ... · 6 Mar 2026

0–1
Seo, Jung Min(2492)

Swedish Team Championships 2025 ... · 18 Jan 2026

0–1
Demchenko, Aleksandr(2620)

Swedish Team Championships 2025 ... · 17 Jan 2026

0–1
Norberg, Erik(2217)

Rond 4: Westerberg, Jonathan - N... · 16 Jan 2026

1–0

Endgame statistics

Repertoire

PRO
901 games in scope
8
7
6
5
4
3
2
1a
b
c
d
e
f
g
h
450 games48%W37%D15%L
Move
1. e4
2928m
52%36%
70%
1. d4
1016m
41%34%25%
57%
1. ♞f3
273y
37%48%15
61%
1. c4
204y
35%50%15
60%
1. f4
316y
100%
100%
1. ♞c3
33y
33%67%
67%
1. g4
34y
100%
100%
1. b3
17y
100%
100%

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