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

Czopor, Maciej

POL POL·Born 2004·FIDE #21805431·1,337 Games

Classical24581,185 Games

Rapid229957 Games

Blitz236995 Games

Statistics

1337

Total

634

Wins

328

Draws

375

Losses

47%25%28%

Play Style

What you need to know before facing them

Elite accuracy: 93.4% average

High resilience (63%): Dangerous even when losing

Solid conversion: 84%

Very consistent (89%)

Very precise: only 0.1 blunders/game

Dominates 1.d4 ♔ (67% in 60 games)

Deep Analysis

Stockfish 18 · Classical games · 375 analyzed

Accuracy by phase

Opening96.5%

Middlegame93.3%

Endgame95.2%

Clutch Factor

Performance under pressure

+5%

Winning (+2 or more)94%

170 Games

Equal position94%

138 Games

Losing (-2 or more)89%

67 Games

Problematic Pieces

Which pieces cause most errors?

♖

23%

77 errors

♕

21%

69 errors

♙

19%

64 errors

♗

15%

49 errors

♞

12%

41 errors

♔

10%

33 errors

Critical Moment

When does the first serious error occur?

Move 46average

1-15

16-25

26-35

36-45

46+

39% of blunders occur between move 26-35. Keep tension until that moment.

Error Heatmap

Where do most errors occur?

11

9

13

12

8

11

9

9

11

9

abcdefgh

Many

Few

Critical squares

d513 err

e512 err

e711 err

f311 err

f411 err

d5/e5 concentrate most errors. Force decisions in those zones.

Recent Games

L

Charvi A2165

Titled Tue 26th May 2026 · 26 May 2026

1-0

L

Daneshvar, Bardiya2596

Titled Tue 26th May 2026 · 26 May 2026

1-0

W

Reprintsev, Alexander2288

Titled Tue 26th May 2026 · 26 May 2026

1-0

L

Galaktionov, Artem2346

Titled Tue 26th May 2026 · 26 May 2026

1-0

W

Derr, Oleg2194

Titled Tue 26th May 2026 · 26 May 2026

1-0

W

Tutuncu, Ali2120

Titled Tue 26th May 2026 · 26 May 2026

0-1

Openings

Based on player games

Weaknesses

EXPLOIT!

White

No significant weaknesses detected as White

Black

No significant weaknesses detected as Black

Strengths

AVOID

White

Sicilian: e6 Systems

61.8%

34 Games·Wins

1.e4 c5 2.Nf3 e6

English: Anglo-Indian

60.0%

20 Games·Wins

1.c4 Nf6 2.Nc3 g6

Black

Sicilian: e6 Systems

46.7%

105 Games·Wins

1.e4 c5 2.Nf3 e6

Reti: Double Fianchetto

53.3%

15 Games·Wins

1.Nf3 Nf6 2.g3 g6

Critical Blunders

Tactical errors analyzed with Stockfish

10 errors

▶

#32Nd3??

Tactics

vs Sammed Jaykumar

Rapid·2025

▶

#32Qc6??

Tactics

vs Theodorou

Rapid·2025

▶

#49g5??

Endgame

vs Kanyamarala

OTB·2025

▶

#36Rxb2??

Tactics

vs Ganti

Blitz·2025

▶

#14Bb5??

Tactics

vs Vijayakumar

Blitz·2025

▶

#27Nxe3??

Tactics

vs Gasanov

Blitz·2025

▶

#23Kd2??

Tactics

vs Royal

Blitz·2025

▶

#28Ke2??

Tactics

vs Hanache

Blitz·2025

▶

#24fxg4??

Tactics

vs Mokhber-Garcia

Blitz·2025

▶

#33Qc1+??

Tactics

vs Bazakutsa

OTB·2025

Endgame Statistics

23 endgame categories analyzed — discover where they collapse under pressure

Repertoire

☰ All

♟ Classical

⚡ Rapid

🔥 Blitz

PRO

·

2026

2025

2024

2023

2022

2021

PRO

8

7

6

5

4

3

2

1a

b

c

d

e

f

g

h

Starting Position

679 Games

50%25%25%

Move	Games	Performance	%
1.e4	371		63%
1.c4	210		62%
1.d4	60		67%
1.Nf3	33		64%
1.b3 Weak	3		17%
1.a3 Strong	1		100%
1.c3 Strong	1		100%

1.e4

63%

371

1.c4

62%

210

1.d4

67%

60

1.Nf3

64%

33

1.b3

17%

3

1.a3

100%

1

1.c3

100%

1

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