GM
Stefansson, Vignir Vatnar
ISL·Born 2003·FIDE #2308649·1,713 Games
ISL Classical25401,641 Games
Rapid244236 Games
Blitz261057 Games
Statistics
1713
Total
776
Wins
530
Draws
401
Losses
45%31%23%
Play Style
What you need to know before facing them
Elite accuracy: 93.8% average
Solid conversion: 90%
Very consistent (91%)
Very precise: only 0.0 blunders/game
Dominates 1.b3 ♔ (82% in 14 games)
Deep Analysis
Stockfish 18 · Classical games · 731 analyzed
Accuracy by phase
Opening96.1%
Middlegame93.5%
Endgame95.3%
Clutch Factor
Performance under pressure
Winning (+2 or more)94%
229 Games
Equal position95%
186 Games
Losing (-2 or more)90%
85 Games
Problematic Pieces
Which pieces cause most errors?
♙
21%
76 errors
♖
21%
78 errors
♞
17%
63 errors
♕
17%
64 errors
♗
15%
54 errors
♔
9%
32 errors
Critical Moment
When does the first serious error occur?
Move 65average
1-15
16-25
26-35
36-45
46+
86% of blunders occur between move 46+. Keep tension until that moment.
Error Heatmap
Where do most errors occur?
14
15
10
12
14
13
10
10
12
11
abcdefgh
Many
Few
Critical squares
e615 err
d414 err
d614 err
e413 err
c412 err
e6/d4 concentrate most errors. Force decisions in those zones.
Recent Games
W
Kjartansson, Gudmundur2399
ch-ISL 2026 · 9 May 2026
D
Stefansson, Hannes2409
ch-ISL 2026 · 8 May 2026
W
Thorfinnsson, Bjorn2356
ch-ISL 2026 · 7 May 2026
W
Heimisson, Hilmir Freyr2310
ch-ISL 2026 · 6 May 2026
W
Ptacnikova, Lenka2126
ch-ISL 2026 · 5 May 2026
W
Birkisson, Bardur Orn2278
ch-ISL 2026 · 4 May 2026
Openings
Based on player games
Weaknesses
EXPLOIT!White
No significant weaknesses detected as White
Black
Sicilian: e6 Systems
64.7%17 Games·Loses
1.e4 c5 2.Nf3 e6
French: Winawer
62.5%8 GamesLow sample·Loses
1.e4 e6 2.d4 d5 3.Nc3 Bb4
Strengths
AVOIDWhite
Queen's Gambit Accepted
90.9%11 Games·Wins
1.d4 d5 2.c4 dxc4
Sicilian: e6 Systems
60.0%10 Games·Wins
1.e4 c5 2.Nf3 e6
Black
Nimzo-Indian: Rubinstein
64.3%14 Games·Wins
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3
Queen's Gambit Declined
53.8%52 Games·Wins
1.d4 d5 2.c4 e6
Critical Blunders
Tactical errors analyzed with Stockfish
10 errors
▶
#46Nc5??
Endgame
vs Droin
Blitz·2025
▶
#25Qb4??
Tactics
vs Samunenkov
Blitz·2025
▶
#34Qg4??
Tactics
vs Hong
Blitz·2025
▶
#44Ke6??
Endgame
vs Ahmad
Blitz·2025
▶
#75Nxf4??
Endgame
vs Oro
Blitz·2025
▶
#18a4??
Tactics
vs Stribuk
Blitz·2025
▶
#48Bxb4??
Endgame
vs Sklokin
Blitz·2025
▶
#29Qxf6??
Tactics
vs Tran
Rapid·2025
▶
#23Kf7??
Tactics
vs Chekh Adm Khedr
Rapid·2025
▶
#71Ba6??
Endgame
vs Jumabayev
Blitz·2025
Endgame Statistics
23 endgame categories analyzed — discover where they collapse under pressure
Repertoire
☰ All
♟ Classical
⚡ Rapid
🔥 Blitz
PRO2026
2025
2024
2023
2022
2021
PRO
8
76
5
4
3
2
1a
b
c
d
efgh857 Games
49%31%20%
1.d4
63%459
1.e4
61%159
1.Nf3
64%104
1.c4
68%80
1.Nc3
71%26
1.b3
82%14
1.g3
75%6
1.f4
90%5
1.e3
75%2
1.d3
100%1
1.a3
100%1