W
GM

Williams, Simon K

ENG ENG·Born 1979·FIDE #404454·2,888 Games

Classical24552,812 Games
Rapid246736 Games
Blitz238940 Games

Play against Williams, Simon K's Twin

PRO

Uses their openings, level & style

Statistics

Total

2888

Wins

1400

Draws

476

Losses

1012
48%16%35%

Play Style

What you need to know before facing them
Elite accuracy: 91.9% average
Low resilience (17%): Doesn't save lost positions
Very consistent (91%)
Very precise: only 0.3 blunders/game
Dominates 1.g3 ♚ (75% in 10 games)
Vulnerable to 1.b3 ♚ (only 44%)

Deep Analysis

Stockfish 18 · Classical games · 100 analyzed
Accuracy by phase
Opening
94.7%
Middlegame
91.3%
Endgame
92.7%
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%28g
Equal position
95%20g
Losing (-2 or more)
89%52g
Performance under pressure
Problematic Pieces — Which pieces cause most errors?
26%
44 errors
18%
31 errors
15%
25 errors
14%
24 errors
14%
24 errors
13%
23 errors
Critical Moment — When does the first serious error occur?
Move 37 average
0%
35%
15%
15%
35%
1-15
16-25
26-35
36-45
46+
35% of blunders occur between move 16-25. Keep tension until that moment.
Error Heatmap — Where do most errors occur?
8
8
7
7
8
7
7
Few
Many
Critical squares
c5
8 err
e5
8 err
f4
8 err
e4
7 err
f3
7 err
c5/e5 concentrate most errors. Force decisions in those zones.

Openings

Based on player games

Weaknesses

— exploit these lines
White58.8%Loses
Caro-Kann — 1.e4 c6 2.Bc4 d5
17 Games · last played last monthPlay this line
White50.0%Loses
1.f4 d5 2.Nf3 Nf6 — 1.f4 d5 2.Nf3 Nf6
8 Games · Low sample · last played 9 months agoPlay this line
Black61.5%Loses
Sicilian: e6 Systems — 1.e4 c5 2.Nf3 e6
13 Games · last played last monthPlay this line
Black53.8%Loses
1.b3 e5 2.Bb2 e4 — 1.b3 e5 2.Bb2 e4
13 Games · last played 8 months agoPlay this line

Strengths

— avoid these lines
White64.7%Wins
English: Anglo-Indian — 1.c4 Nf6 2.Nc3 g617 Games
White63.2%Wins
Grünfeld — 1.d4 Nf6 2.c4 g6 3.Nc3 d519 Games
Black45.4%Wins
Sicilian: d6 Systems — 1.e4 c5 2.Nf3 d6163 Games
Black52.8%Wins
French: Tarrasch — 1.e4 e6 2.d4 d5 3.Nd253 Games

Critical Blunders

10 errors · Stockfish
Ra3??vs Henriquez VillagraOTB · 2026
Ka4??vs Anton GuijarroOTB · 2026
Nc5??vs Martinez AlcantaraOTB · 2026
c5??vs ShimanovOTB · 2026
axb5??vs Henriquez VillagraOTB · 2026
fxg4??vs TheodorouOTB · 2026
a5??vs NguyenOTB · 2026
Bf5??vs Laurent-PaoliOTB · 2026
Ke5??vs BluebaumOTB · 2025
fxe3??vs DudaOTB · 2025

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Endgame Statistics

PRO21 endgame categories analyzed
Endgame Statistics
Reveal weaknesses →
Repertoire
8
7
6
5
4
3
2
1a
b
c
d
e
f
g
h
Move arrowsmost-played moves
Stockfish
1417 Games
50%16%34%
MoveGamesPerformance%
1.d4
836
58%
1.e4
238
58%
1.c4
177
64%
1.f4
86
51%
1.Nf3
36
50%
1.b3
20
58%
1.a4
5
60%
1.Na3
5
60%
1.g4
5
60%
1.b4Strong
2
100%
1.Nc3Weak
2
25%
1.a3Strong
1
100%
1.g3Weak
1
0%
1.h4Weak
1
0%
1.Nh3Strong
1
100%
1.f3Strong
1
100%

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