IM

Gunnarsson, Jon Viktor

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

Classical24141,173 Games
Rapid24141 Games
Blitz235225 Games

Statistics

1199

Total

541

Wins

332

Draws

326

Losses

45%28%27%

Play Style

What you need to know before facing them

Elite accuracy: 93.8% 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 · 72 analyzed

Accuracy by phase
Opening96.1%
Middlegame92.7%
Endgame94.3%

Clutch Factor

Performance under pressure

+4%
Winning (+2 or more)95%
42 Games
Equal position94%
16 Games
Losing (-2 or more)91%
14 Games

Problematic Pieces

Which pieces cause most errors?

♞
23%
11 errors
♙
23%
11 errors
♔
17%
8 errors
♖
17%
8 errors
♗
11%
5 errors
♕
9%
4 errors

Critical Moment

When does the first serious error occur?

Move 36average
1-15
16-25
26-35
36-45
46+
100% of blunders occur between move 36-45. Keep tension until that moment.

Error Heatmap

Where do most errors occur?

2
2
2
2
2
4
2
2
3
2
abcdefgh
Many
Few
Critical squares
f44 err
f33 err
a62 err
b72 err
d32 err
f4/f3 concentrate most errors. Force decisions in those zones.

Recent Games

D
Bjornsson, Sigurbjorn2277

Icelandic team chess cham... · 8 Mar 2026

½-½
D
Bjornsson,Si2277

TCh-ISL Kvika 2025-26 · 8 Mar 2026

½-½
L
Johannsson, Orn Leo2297

Icelandic team chess cham... · 7 Mar 2026

1-0
W
Einarsson, Halldor Gretar2174

Icelandic team chess cham... · 7 Mar 2026

1-0
D
Prudnikov, Andrey2121

Icelandic team chess cham... · 6 Mar 2026

½-½
L
Logason, Thorvaldur2039

Icelandic team chess cham... · 5 Mar 2026

1-0

Openings

Based on player games

Weaknesses

EXPLOIT!
White
Caro-Kann: Steinitz
50.0%
8 GamesLow sample·Loses

1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nf6

Black
French: Classical
52.4%
21 Games·Loses

1.e4 e6 2.d4 d5 3.Nc3 Nf6

Strengths

AVOID
White
French: Classical
66.7%
15 Games·Wins

1.e4 e6 2.d4 d5 3.Nc3 Nf6

Sicilian: Rossolimo
61.1%
18 Games·Wins

1.e4 c5 2.Nf3 Nc6 3.Bb5

Black
Sicilian: Najdorf
55.0%
20 Games·Wins

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6

Petroff: Main Line
45.8%
24 Games·Wins

1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6

Critical Blunders

Tactical errors analyzed with Stockfish

10 errors
▶
#30Bg8??
Tactics
vs Safarli
OTB·2025
▶
#28Bc8??
Tactics
vs Martin
OTB·2025
▶
#28Rxc6??
Tactics
vs Lohr
OTB·2025
▶
#45f4??
Endgame
vs Halldorsson
OTB·2023
▶
#36Kg3??
Tactics
vs Ragnarsson
OTB·2021
▶
#18Rh7??
Tactics
vs Stefansson
Blitz·2020
▶
#50Rxc4??
Endgame
vs Stefansson
Blitz·2020
▶
#43exd6+??
Endgame
vs Hjartarson
Blitz·2020
▶
#35Rb2??
Tactics
vs Gretarsson
Blitz·2020
▶
#77Rg8??
Endgame
vs Thorfinnsson
Blitz·2020
Endgame Statistics

21 endgame categories analyzed — discover where they collapse under pressure

Repertoire
☰ All
♟ Classical
⚡ Rapid
🔥 Blitz
PRO
·
2026
2025
2024
2023
2022
2021
PRO
8
7
6
5
4
3
2
1a
b
c
d
e
f
g
h
Starting Position
597 Games
50%28%22%
1.e4
62%
529
1.d4
74%
29
1.c4
79%
17
1.Nf3
66%
16
1.b3
70%
5
1.g3
0%
1
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