Gunnarsson, Jon Viktor

ISL ISL·Born 1980·FIDE #2300931·1,199 Games

FIDE OTB · #2300931 · 1,199 Games

Classical24141,173 g Games

Rapid24141 g Games

Blitz235225 g Games

Play against Gunnarsson's Twin

PRO

Uses their openings, level & style

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1199 games analyzed

Statistics

Total

1199

Wins

541

Draws

332

Losses

326

45%28%27%

Play Style

before facing themWhat you need to know before facing them

Elite accuracy: 93.7% average

Solid conversion: 86%

Very consistent (92%)

Very precise: only 0.0 blunders/game

Dominates 1.c4 ♔ (79% in 17 games)

Deep Analysis

Stockfish 18 · Classical games · 76 analyzed

Accuracy by phase

Opening

96.0%

Middlegame

92.6%

Endgame

94.1%

Clutch Factor

+4%

Winning (+2)Winning (+2)

95%43g

EqualEqual position

94%16g

Losing (−2)Losing (−2)

91%17g

Accuracy under pressure

Problematic Pieces — which cause most errors?

24%

13 err

22%

12 err

17%

9 err

17%

9 err

11%

6 err

5 err

Critical Moment

Move 36 avg

1-15

16-25

26-35

100%

36-45

46+

100% 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

f4 / d5

Critical squares

4 err

3 err

f4/d5 account for most of the errors. Force decisions in those zones.

Openings

1,199 GamesBased on 1,199 player games

Weaknesses

— exploit these— exploit these lines

aswhite50.0%Losses

Caro-Kann: Steinitz — 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nf6

8 Games · Low sample · last played last yearPlay this line

asblack52.4%Losses

French: Classical — 1.e4 e6 2.d4 d5 3.Nc3 Nf6

21 Games · last played 17 years agoPlay this line

Strengths

— avoid these— avoid these lines

aswhite66.7%Wins

French: Classical — 1.e4 e6 2.d4 d5 3.Nc3 Nf615 Games · last played 17 years ago

15 Games · last played 17 years ago

aswhite61.1%Wins

Sicilian: Rossolimo — 1.e4 c5 2.Nf3 Nc6 3.Bb518 Games · last played 7 years ago

18 Games · last played 7 years ago

asblack55.0%Wins

Sicilian: Najdorf — 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a620 Games · last played last year

20 Games · last played last year

asblack45.8%Wins

Petroff: Main Line — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d624 Games

24 Games

Critical Blunders

10 errors · Stockfish

#30Bg8??Tacticsvs SafarliOTB · 2025

#28Bc8??Tacticsvs MartinOTB · 2025

#28Rxc6??Tacticsvs LohrOTB · 2025

#22Nh4??Tacticsvs OroOTB · 2024

#45f4??Endgamevs HalldorssonOTB · 2023

#36Kg3??Tacticsvs RagnarssonOTB · 2021

#77Rg8??Endgamevs ThorfinnssonBlitz · 2020

#50Rxc4??Endgamevs StefanssonBlitz · 2020

#43exd6+??Endgamevs HjartarsonBlitz · 2020

#35Rb2??Tacticsvs GretarssonBlitz · 2020

Recent Games

1,199 Games

Draw

Bjornsson, Sigurbjorn(2277)

Icelandic team chess cham... · 8 Mar 2026

½-½

Draw

Bjornsson,Si(2277)

TCh-ISL Kvika 2025-26 · 8 Mar 2026

½-½

Loss

Johannsson, Orn Leo(2297)

Icelandic team chess cham... · 7 Mar 2026

1-0

Win

Einarsson, Halldor Gretar(2174)

Icelandic team chess cham... · 7 Mar 2026

1-0

Draw

Prudnikov, Andrey(2121)

Icelandic team chess cham... · 6 Mar 2026

½-½

Loss

Logason, Thorvaldur(2039)

Icelandic team chess cham... · 5 Mar 2026

1-0

Endgame Statistics

PRO49 endgames (54.4%)

Unlock Endgame Statistics

0 endgame categories analyzed — discover where they collapse under pressure

Repertoire

Move arrowsmost-played moves

Starting Position

Stockfish

597 Games

50%28%22%

Move	Games	%
1.e4	529	62%
1.d4Strong	29	74%
1.c4Strong	17	79%
1.Nf3	16	66%
1.b3	5	70%
1.g3Weak	1	0%

MoveGamesPerformance%

1.e4

529

62%

1.d4Strong

74%

1.c4Strong

79%

1.Nf3

66%

1.b3

70%

1.g3Weak