W
GM
Williams, Simon K
ENG·Born 1979·FIDE #404454·2,888 Games
Classical24552,812 Games
Rapid246736 Games
Blitz238940 Games
Play against Williams, Simon K's Twin
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Ready to play
2888 games analyzed
Statistics
Total
2888Wins
1400Draws
476Losses
101248%16%35%
Play Style
What you need to know before facing themElite 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 analyzedAccuracy 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 average0%
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
FewMany
Errors mapped
70
Hotspot zone
c5 / e5
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 gamesWeaknesses
— exploit these linesWhite58.8%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 linesWhite64.7%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#58Ra3??vs Henriquez VillagraOTB · 2026
#49Ka4??vs Anton GuijarroOTB · 2026
#52Nc5??vs Martinez AlcantaraOTB · 2026
#61c5??vs ShimanovOTB · 2026
#45axb5??vs Henriquez VillagraOTB · 2026
#25fxg4??vs TheodorouOTB · 2026
#36a5??vs NguyenOTB · 2026
#49Bf5??vs Laurent-PaoliOTB · 2026
#59Ke5??vs BluebaumOTB · 2025
#22fxe3??vs DudaOTB · 2025
Recent Games
2,888 GamesW
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Endgame Statistics
PRO21 endgame categories analyzedEndgame Statistics
Reveal weaknesses →
21 endgame categories analyzed — discover where they collapse under pressure
Repertoire
6
5
4
3
Move arrowsmost-played moves
Stockfish
1417 Games
50%16%34%
MoveGamesPerformance%
1.d4
83658%
1.e4
23858%
1.c4
17764%
1.f4
8651%
1.Nf3
3650%
1.b3
2058%
1.a4
560%
1.Na3
560%
1.g4
560%
1.b4Strong
2100%
1.Nc3Weak
225%
1.a3Strong
1100%
1.g3Weak
10%
1.h4Weak
10%
1.Nh3Strong
1100%
1.f3Strong
1100%
ENG