Stocek, Jiri

CZE CZE·Born 1977·FIDE #304760·2,359 Games

FIDE OTB · #304760 · 2,359 Games

Classical24842,130 g Games

Rapid2469151 g Games

Blitz238378 g Games

Play against Stocek's Twin

PRO

Uses their openings, level & style

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

Ready to play

2359 games analyzed

Statistics

Total

2359

Wins

1067

Draws

841

Losses

450

45%36%19%

Play Style

before facing themWhat you need to know before facing them

Elite accuracy: 93.5% average

Solid conversion: 84%

Very consistent (91%)

Very precise: only 0.1 blunders/game

Dominates 1.Nf3 ♔ (69% in 126 games)

Deep Analysis

Stockfish 18 · Classical games · 116 analyzed

Accuracy by phase

Opening

96.2%

Middlegame

93.9%

Endgame

95.5%

Clutch Factor

+5%

Winning (+2)Winning (+2)

95%50g

EqualEqual position

95%39g

Losing (−2)Losing (−2)

89%27g

Accuracy under pressure

Problematic Pieces — which cause most errors?

20%

21 err

18%

19 err

17%

18 err

17%

18 err

15%

16 err

12%

12 err

Critical Moment

Move 46 avg

1-15

11%

16-25

33%

26-35

22%

36-45

33%

46+

33% of blunders after move 26-35 — keep the tension until then.of blunders occur in moves 26-35. Keep the tension until that moment.

Error Heatmap — where do errors occur?

Few

Many

Errors mapped

Hotspot zone

e4 / g5

Critical squares

7 err

5 err

e4/g5 account for most of the errors. Force decisions in those zones.

Openings

2,359 GamesBased on 2,359 player games

Weaknesses

— exploit these— exploit these lines

No significant weaknesses detected as white

No significant weaknesses detected as black

Strengths

— avoid these— avoid these lines

aswhite75.0%Wins

King's Indian: Classical — 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be224 Games · last played 4 months ago

24 Games · last played 4 months ago

aswhite73.3%Wins

English: Anglo-Indian — 1.c4 Nf6 2.Nc3 g615 Games · last played 5 years ago

15 Games · last played 5 years ago

asblack72.7%Wins

English vs 1...e5 — 1.c4 e5 2.Nc3 Bb411 Games · last played 3 years ago

11 Games · last played 3 years ago

asblack55.9%Wins

Nimzo-Indian: Rubinstein — 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e334 Games · last played 5 months ago

34 Games · last played 5 months ago

Critical Blunders

10 errors · Stockfish

#28Kf1??Tacticsvs PultineviciusOTB · 2026

#32Kg1??Tacticsvs PultineviciusOTB · 2025

#15Nxe4??Tacticsvs KrejciOTB · 2025

#42Qh4??Endgamevs DavydovOTB · 2025

#61a3??Endgamevs De JongOTB · 2024

#35g5??Tacticsvs TabatabaeiOTB · 2024

#39Bxe4??Tacticsvs WemmersOTB · 2024

#22Nd5??Tacticsvs GomboczOTB · 2024

#33Rxa2??Tacticsvs MaciejewskiOTB · 2024

#77Kc1??Endgamevs KrastevaOTB · 2024

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Endgame Statistics

PRO65 endgames (52%)

Strongest

Weakest

11%

Minor Piece Pairs

Reaches Endgame

52%

65 / 125

B vs N Pref

0% · 0%

0 / 3

PiecesTypeWin %Games

Rook + Minor42.4%33

Rook + Equal Minors44.4%18

Rook vs Rook46.2%13

Rook+Bishop vs Rook+Knight50%12

Rook + Bishop Pair20%10

Minor Piece Pairs11.1%9

Rook + Minor42.4%33

Rook + Equal Minors44.4%18

Rook vs Rook46.2%13

Rook+Bishop vs Rook+Knight50%12

Rook + Bishop Pair20%10

Minor Piece Pairs11.1%9

Weakest: Minor Piece Pairs 11%Show all 23 types

Unlock Endgame Statistics

23 endgame categories analyzed — discover where they collapse under pressure

Repertoire

Move arrowsmost-played moves

Starting Position

Stockfish

1194 Games

49%35%16%

Move	Games	%
1.d4	721	68%
1.e4	210	62%
1.c4	136	65%
1.Nf3	126	69%
1.d3 Weak	1	0%

MoveGamesPerformance%

1.d4

721

68%

1.e4

210

62%

1.c4

136

65%

1.Nf3

126

69%

1.d3Weak