Chess Stalker — Free Chess Opponent Analysis

Analyze any Lichess, Chess.com or FIDE player's openings, weaknesses, blunder patterns and psychological profile. Train against a Twin Bot that replicates your opponent's style. Search by username or FIDE ID across 11 million+ games. Free to use, no signup required.

What you get

Opponent weakness analysis — opening repertoire, common blunders, time pressure patterns
Twin Bot — practice against an AI clone of your opponent's exact playing style
FIDE OTB database — 11 million+ tournament games and 1.7 million+ rated players
Stockfish-powered analysis with depth-25 evaluations
Multi-platform: Lichess, Chess.com, and FIDE in one place
Head-to-head comparison, Nemesis detection, Stalker Score

How it works

Search any Lichess, Chess.com username or FIDE player
Get instant scouting report with weaknesses and patterns
Prepare your strategy and practice against the Twin Bot

IM

Tomczak, Mikolaj

POL POL·Born 1999·FIDE #1175114·599 Games

Classical2440557 Games

Rapid248227 Games

Blitz250015 Games

Statistics

599

Total

264

Wins

203

Draws

132

Losses

44%34%22%

Play Style

What you need to know before facing them

Elite accuracy: 94.3% average

High resilience (72%): Dangerous even when losing

Solid conversion: 81%

Very consistent (91%)

Very precise: only 0.0 blunders/game

Dominates 1.c4 ♔ (71% in 12 games)

Vulnerable to 1.c4 ♚ (only 40%)

Deep Analysis

Stockfish 18 · Classical games · 69 analyzed

Accuracy by phase

Opening96.5%

Middlegame94.2%

Endgame95.4%

Clutch Factor

Performance under pressure

+6%

Winning (+2 or more)95%

30 Games

Equal position95%

34 Games

Losing (-2 or more)89%

5 Games

Problematic Pieces

Which pieces cause most errors?

♙

27%

12 errors

♕

18%

8 errors

♗

16%

7 errors

♖

16%

7 errors

♞

13%

6 errors

♔

11%

5 errors

Critical Moment

When does the first serious error occur?

Move 36average

1-15

16-25

26-35

36-45

46+

50% of blunders occur between move 26-35. Keep tension until that moment.

Error Heatmap

Where do most errors occur?

2

2

2

2

4

2

2

1

1

5

abcdefgh

Many

Few

Critical squares

e15 err

g54 err

d52 err

e42 err

e52 err

e1/g5 concentrate most errors. Force decisions in those zones.

Recent Games

L

Tahbaz, Arash2462

Titled Tue 8th Jul Late · 8 Jul 2025

0-1

L

Ozen, Batuhan2128

Titled Tue 8th Jul Late · 8 Jul 2025

1-0

W

Bharath Subramaniyam H2561

Titled Tue 8th Jul Late · 8 Jul 2025

1-0

W

Squella Lavin, Carlos Felipe2206

Titled Tue 8th Jul Late · 8 Jul 2025

1-0

W

Uzcategui Rodriguez, Alejandro2308

Titled Tue 8th Jul Late · 8 Jul 2025

0-1

D

Pham, Le Thao Nguyen2388

Titled Tue 18th Feb Late · 18 Feb 2025

½-½

Openings

Based on player games

Weaknesses

EXPLOIT!

White

Ruy Lopez: Morphy

50.0%

10 Games·Loses

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6

King's Indian: Main Line

45.5%

11 Games·Loses

1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O

Black

No significant weaknesses detected as Black

Strengths

AVOID

White

Slav Defense

55.6%

18 Games·Wins

1.d4 d5 2.c4 c6

Black

Sicilian: e6 Systems

64.0%

25 Games·Wins

1.e4 c5 2.Nf3 e6

Critical Blunders

Tactical errors analyzed with Stockfish

9 errors

▶

#37Qd6+??

Tactics

vs Skawinski

OTB·2021

▶

#36Bxb4??

Endgame

vs Molenda

OTB·2020

▶

#26Qh6??

Tactics

vs Kindler

OTB·2020

▶

#31c4??

Tactics

vs Tomaszewski

OTB·2020

▶

#42Kg3??

Endgame

vs Esipenko

Blitz·2020

▶

#34h4??

Tactics

vs Belous

OTB·2020

▶

#40Ke1??

Tactics

vs Ynojosa Aponte

OTB·2020

▶

#103Ba2??

Endgame

vs Fus

OTB·2019

▶

#24Ne5??

Tactics

vs Tymrakiewicz

OTB·2019

Endgame Statistics

19 endgame categories analyzed — discover where they collapse under pressure

Repertoire

☰ All

♟ Classical

⚡ Rapid

🔥 Blitz

PRO

·

2025

2022

2021

2020

2019

2018

PRO

8

7

6

5

4

3

2

1a

b

c

d

e

f

g

h

Starting Position

301 Games

49%33%18%

Move	Games	Performance	%
1.d4	140		66%
1.e4	94		64%
1.Nf3	52		65%
1.c4 Strong	12		71%
1.b3	3		33%

1.d4

66%

140

1.e4

64%

94

1.Nf3

65%

52

1.c4

71%

12

1.b3

33%

3

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