Stefansson, Vignir Vatnar

ISL ISL·Born 2003·FIDE #2308649·1,713 Games

Classical25401,641 Games

Rapid244636 Games

Blitz261157 Games

Play against Stefansson, Vignir Vatnar's Twin

PRO

Uses their openings, level & style

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

Ready to play

1713 games analyzed

Statistics

Total

1713

Wins

776

Draws

530

Losses

401

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 · 739 analyzed

Accuracy by phase

Opening

96.1%

Middlegame

93.5%

Endgame

95.3%

Clutch Factor — Move accuracy when winning vs. equal vs. losing — does their level drop when the game turns against them?

+5%

Winning (+2 or more)

94%229g

Equal position

95%186g

Losing (-2 or more)

90%85g

Performance under pressure

Problematic Pieces — Which pieces cause most errors?

21%

76 errors

21%

78 errors

17%

63 errors

17%

63 errors

15%

54 errors

32 errors

Critical Moment — When does the first serious error occur?

Move 65 average

14%

86%

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?

Few

Many

Errors mapped

121

Hotspot zone

e6 / d4

Critical squares

15 err

14 err

13 err

12 err

e6/d4 concentrate most errors. Force decisions in those zones.

Openings

Based on player games

Weaknesses

— exploit these lines

No significant weaknesses detected as White

Black64.7%Loses

Sicilian: e6 Systems — 1.e4 c5 2.Nf3 e6

17 Games · last played 9 months agoPlay this line

Black62.5%Loses

French: Winawer — 1.e4 e6 2.d4 d5 3.Nc3 Bb4

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

Strengths

— avoid these lines

White90.9%Wins

Queen's Gambit Accepted — 1.d4 d5 2.c4 dxc411 Games · last played 2 years ago

White60.0%Wins

Sicilian: e6 Systems — 1.e4 c5 2.Nf3 e610 Games · last played 9 months ago

Black64.3%Wins

Nimzo-Indian: Rubinstein — 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e314 Games · last played 4 months ago

Black53.8%Wins

Queen's Gambit Declined — 1.d4 d5 2.c4 e652 Games · last played 4 months ago

Critical Blunders

10 errors · Stockfish

#25Qb4??Tacticsvs SamunenkovBlitz · 2025

#46Nc5??Endgamevs DroinBlitz · 2025

#34Qg4??Tacticsvs HongBlitz · 2025

#18a4??Tacticsvs StribukBlitz · 2025

#44Ke6??Endgamevs AhmadBlitz · 2025

#48Bxb4??Endgamevs SklokinBlitz · 2025

#75Nxf4??Endgamevs OroBlitz · 2025

#23Kf7??Tacticsvs Chekh Adm KhedrRapid · 2025

#29Qxf6??Tacticsvs TranRapid · 2025

#71Ba6??Endgamevs JumabayevBlitz · 2025

Recent Games

1,713 Games

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Endgame Statistics

PRO23 endgame categories analyzed

Endgame Statistics

Reveal weaknesses →

23 endgame categories analyzed — discover where they collapse under pressure

Repertoire

Move arrowsmost-played moves

Starting Position

Stockfish

857 Games

49%31%20%

Move	Games	%
1.d4	459	63%
1.e4	159	61%
1.Nf3	104	64%
1.c4	80	68%
1.Nc3 Strong	26	71%
1.b3 Strong	14	82%
1.g3 Strong	6	75%
1.f4 Strong	5	90%
1.e3 Strong	2	75%
1.d3 Strong	1	100%
1.a3 Strong	1	100%

MoveGamesPerformance%

1.d4

459

63%

1.e4

159

61%

1.Nf3

104

64%

1.c4

68%

1.Nc3Strong

71%

1.b3Strong

82%

1.g3Strong

75%

1.f4Strong

90%

1.e3Strong

75%

1.d3Strong

100%

1.a3Strong

100%