Tomczak, Jacek

POL POL·Born 1990·FIDE #1124668·1,974 Games

FIDE OTB · #1124668 · 1,974 Games

Classical25451,805 g Games

Rapid2546131 g Games

Blitz252338 g Games

Play against Tomczak's Twin

PRO

Uses their openings, level & style

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

Ready to play

1974 games analyzed

Statistics

Total

1974

Wins

891

Draws

699

Losses

383

45%35%19%

Play Style

before facing themWhat you need to know before facing them

Elite accuracy: 93.7% average

Solid conversion: 87%

Very consistent (91%)

Very precise: only 0.1 blunders/game

Dominates 1.e4 ♔ (67% in 958 games)

Deep Analysis

Stockfish 18 · Classical games · 441 analyzed

Accuracy by phase

Opening

96.4%

Middlegame

93.8%

Endgame

94.8%

Clutch Factor

+5%

Winning (+2)Winning (+2)

94%173g

EqualEqual position

95%190g

Losing (−2)Losing (−2)

90%78g

Accuracy under pressure

Problematic Pieces — which cause most errors?

25%

91 err

20%

71 err

18%

66 err

13%

48 err

12%

43 err

11%

38 err

Critical Moment

Move 45 avg

1-15

13%

16-25

22%

26-35

35%

36-45

30%

46+

35% of blunders after move 36-45 — keep the tension until then.of blunders occur in moves 36-45. Keep the tension until that moment.

Error Heatmap — where do errors occur?

Few

Many

Errors mapped

113

Hotspot zone

e5 / f5

Critical squares

14 err

11 err

e5/f5 account for most of the errors. Force decisions in those zones.

Openings

1,974 GamesBased on 1,974 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

aswhite66.3%Wins

Sicilian: e6 Systems — 1.e4 c5 2.Nf3 e686 Games · last played 3 months ago

86 Games · last played 3 months ago

aswhite69.6%Wins

French: Winawer — 1.e4 e6 2.d4 d5 3.Nc3 Bb446 Games · last played last year

46 Games · last played last year

asblack52.9%Wins

English: Four Knights — 1.c4 e5 2.Nc3 Nf617 Games · last played 3 years ago

17 Games · last played 3 years ago

asblack50.0%Wins

Caro-Kann: Main Line — 1.e4 c6 2.d4 d5 3.Nc3 dxe412 Games · last played last year

12 Games · last played last year

Critical Blunders

10 errors · Stockfish

#36Ra4??Tacticsvs FiszerOTB · 2025

#83Nf6??Endgamevs Savitha Shri BOTB · 2025

#32Kd7??Endgamevs VetoshkoOTB · 2025

#29Ne7??Tacticsvs KlimkowskiOTB · 2025

#42Bxc6??Endgamevs LuczakOTB · 2025

#26b3??Tacticsvs GaponenkoOTB · 2025

#36Kf6??Endgamevs NiemannOTB · 2025

#41Ke5??Endgamevs WojtaszekOTB · 2024

#37Kh8??Tacticsvs PsykOTB · 2024

#45Qd2??Endgamevs Martinez AlcantaraOTB · 2024

Recent Games

1,974 Games

Draw

Ivic, Velimir(2630)

Bundesliga 2025-26 · 26 Apr 2026

½-½

Win

Predke, Alexandr(2609)

Bundesliga 2025-26 · 25 Apr 2026

1-0

Win

Vogel, Roven(2534)

Bundesliga 2025-26 · 24 Apr 2026

1-0

Loss

Kollars, Dmitrij(2630)

German Bundesliga 2025-26 · 22 Mar 2026

1-0

Draw

Eljanov, Pavel(2659)

Schachbundesliga 2025/202... · 21 Mar 2026

½-½

Draw

Alekseenko, Kirill(2652)

SBL München · 1 Mar 2026

½-½

Endgame Statistics

PRO244 endgames (52.1%)

Strongest

60%

Opposite-Color Bishops

Weakest

17%

Knight vs Knight

Reaches Endgame

52.1%

244 / 468

B vs N Pref

33.3% · 55.6%

3 / 9

PiecesTypeWin %Games

Rook + Minor

34.1%129

Rook+Bishop vs Rook+Knight

31%71

Rook + Equal Minors

31.1%61

Rook vs Rook

28.3%60

Rook vs Minor (Exchange)

27%37

Queen vs Pieces

34.4%32

Rook + Minor34.1%129

Rook+Bishop vs Rook+Knight31%71

Rook + Equal Minors31.1%61

Rook vs Rook28.3%60

Rook vs Minor (Exchange)27%37

Queen vs Pieces34.4%32

Weakest: Knight vs Knight 17%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

1000 Games

50%34%16%

Move	Games	%
1.e4	958	67%
1.d4	37	62%
1.c4	4	63%
1.f3Weak	1	0%

MoveGamesPerformance%

1.e4

958

67%

1.d4

62%

1.c4

63%

1.f3Weak