Westerberg, Jonathan

SWE SWE·Born 1994·FIDE #1701754·1,039 Games

FIDE OTB · #1701754 · 1,039 Games

Classical24521,002 g Games

Rapid242635 g Games

Blitz24622 g Games

Play against Westerberg's Twin

PRO

Uses their openings, level & style

Practice against a bot that uses their real openings and playing style

Ready to play

1039 games analyzed

Statistics

Total

1039

Wins

477

Draws

357

Losses

205

46%34%20%

Play Style

before facing themWhat you need to know 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 ♔ (71% in 326 games)

Deep Analysis

Stockfish 18 · Classical games · 169 analyzed

Accuracy by phase

Opening

95.2%

Middlegame

93.4%

Endgame

95.3%

Clutch Factor

+4%

Winning (+2)Winning (+2)

94%73g

EqualEqual position

94%63g

Losing (−2)Losing (−2)

90%33g

Accuracy under pressure

Problematic Pieces — which cause most errors?

28%

46 err

20%

33 err

16%

26 err

14%

23 err

12%

20 err

14 err

Critical Moment

Move 45 avg

1-15

16-25

30%

26-35

40%

36-45

30%

46+

40% of blunders after move 36-45 — keep the tension until then.of blunders occur in moves 36-45. Keep the tension until that moment.

Error Heatmap — where do errors occur?

Few

Many

Errors mapped

Hotspot zone

d4 / d7

Critical squares

8 err

7 err

6 err

d4/d7 account for most of the errors. Force decisions in those zones.

Openings

1,039 GamesBased on 1,039 player games

Weaknesses

— exploit these— exploit these lines

No significant weaknesses detected as white

No significant weaknesses detected as black

Strengths

— avoid these— avoid these lines

aswhite62.5%Wins

Sicilian: Closed — 1.e4 c5 2.Nc3 Nc624 Games · last played 4 years ago

24 Games · last played 4 years ago

aswhite56.3%Wins

French: Classical — 1.e4 e6 2.d4 d5 3.Nc3 Nf616 Games · last played 7 years ago

16 Games · last played 7 years ago

asblack56.1%Wins

Queen's Gambit Accepted — 1.d4 d5 2.c4 dxc457 Games · last played 5 months ago

57 Games · last played 5 months ago

asblack47.4%Wins

Sicilian: e6 Systems — 1.e4 c5 2.Nf3 e638 Games · last played last year

38 Games · last played last year

Critical Blunders

10 errors · Stockfish

#37Nxf3??Tacticsvs KucuksariOTB · 2025

#48Qe1+??Endgamevs LivnerOTB · 2025

#59Ke6??Endgamevs EvertssonOTB · 2025

#20Qd5??Tacticsvs IvarssonOTB · 2025

#40Qxa4??Tacticsvs MiezisOTB · 2024

#42g4??Endgamevs HellersOTB · 2024

#33Rf5??Tacticsvs SkjoldebrandOTB · 2023

#29Bg5??Tacticsvs PeturssonOTB · 2022

#40Rd7+??Tacticsvs SeoOTB · 2022

#39Ng5+??Endgamevs PoleyOTB · 2022

Recent Games

1,039 Games

Loss

Galperin, Platon(2502)

TCh-SWE Elitserien · 8 Mar 2026

1-0

Loss

Galperin, Platon(2504)

Rond 9: Galperin, Platon ... · 8 Mar 2026

1-0

Draw

Lindberg, Bengt(1524)

Swedish Team Championship... · 7 Mar 2026

½-½

Loss

Olsson, William(2385)

Swedish Team Championship... · 6 Mar 2026

1-0

Loss

Olsson, William(2378)

Rond 7: Olsson, William -... · 6 Mar 2026

1-0

Loss

Seo, Jung Min(2492)

Swedish Team Championship... · 18 Jan 2026

1-0

Endgame Statistics

PRO101 endgames (59.8%)

Strongest

62%

Rook vs Minor (Exchange)

Weakest

11%

Double Rook

Reaches Endgame

59.8%

101 / 169

B vs N Pref

50% · 0%

6 / 1

PiecesTypeWin %Games

Rook + Minor

37.3%59

Rook + Equal Minors

35.7%28

Rook vs Rook

29.6%27

Rook+Bishop vs Rook+Knight

36.4%22

Queen vs Pieces

60%15

Rook vs Minor (Exchange)

61.5%13

Rook + Minor37.3%59

Rook + Equal Minors35.7%28

Rook vs Rook29.6%27

Rook+Bishop vs Rook+Knight36.4%22

Queen vs Pieces60%15

Rook vs Minor (Exchange)61.5%13

Weakest: Double Rook 11%Show all 22 types

Unlock Endgame Statistics

22 endgame categories analyzed — discover where they collapse under pressure

Repertoire

Move arrowsmost-played moves

Starting Position

Stockfish

503 Games

49%36%15%

Move	Games	%
1.e4Strong	326	71%
1.d4	112	59%
1.Nf3	31	61%
1.c4	23	59%
1.f4Strong	3	100%
1.Nc3	3	67%
1.g4Strong	3	100%
1.b3Strong	2	100%

MoveGamesPerformance%

1.e4Strong

326

71%

1.d4

112

59%

1.Nf3

61%

1.c4

59%

1.f4Strong

100%

1.Nc3

67%

1.g4Strong

100%

1.b3Strong

100%