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

Cieslak, Patryk

POL POL·Born 2010·FIDE #21078882·1,604 Games

Classical24941,521 Games

Rapid230649 Games

Blitz237334 Games

Statistics

1604

Total

806

Wins

336

Draws

461

Losses

50%21%29%

Play Style

What you need to know before facing them

Elite accuracy: 92.8% average

High resilience (59%): Dangerous even when losing

Solid conversion: 85%

Very consistent (86%)

Very precise: only 0.1 blunders/game

Dominates 1.c4 ♔ (73% in 96 games)

Vulnerable to 1.b3 ♚ (only 33%)

Deep Analysis

Stockfish 18 · Classical games · 309 analyzed

Accuracy by phase

Opening96.6%

Middlegame93.1%

Endgame94.9%

Clutch Factor

Performance under pressure

+5%

Winning (+2 or more)94%

130 Games

Equal position94%

121 Games

Losing (-2 or more)89%

58 Games

Problematic Pieces

Which pieces cause most errors?

♖

23%

82 errors

♕

19%

67 errors

♙

18%

63 errors

♞

16%

57 errors

♔

13%

44 errors

♗

10%

36 errors

Critical Moment

When does the first serious error occur?

Move 44average

1-15

16-25

26-35

36-45

46+

54% of blunders occur between move 46+. Keep tension until that moment.

Error Heatmap

Where do most errors occur?

11

10

11

10

12

13

11

10

10

11

abcdefgh

Many

Few

Critical squares

c413 err

e512 err

b611 err

d311 err

d411 err

c4/e5 concentrate most errors. Force decisions in those zones.

Recent Games

D

Milanovic, Danilo2393

TCh-AUT Rapid 2026 · 17 May 2026

½-½

D

Kundianok, Vladislav2431

TCh-AUT Rapid 2026 · 17 May 2026

½-½

D

Tabatabaei, M. Amin2714

TCh-AUT Rapid 2026 · 17 May 2026

½-½

W

Mostbauer, Maximilian2255

TCh-AUT Rapid 2026 · 17 May 2026

1-0

D

Pichot, Alan2581

TCh-AUT Rapid 2026 · 17 May 2026

½-½

D

Reprintsev, Alexander2288

TCh-AUT Rapid 2026 · 17 May 2026

½-½

Openings

Based on player games

Weaknesses

EXPLOIT!

White

Ruy Lopez: Closed

44.4%

9 GamesLow sample·Loses

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7

Sicilian: Classical

42.9%

14 Games·Loses

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6

Black

No significant weaknesses detected as Black

Strengths

AVOID

White

English: Anglo-Indian

80.0%

10 Games·Wins

1.c4 Nf6 2.Nc3 g6

Sicilian: Rossolimo

66.7%

12 Games·Wins

1.e4 c5 2.Nf3 Nc6 3.Bb5

Black

French: Tarrasch

60.0%

10 Games·Wins

1.e4 e6 2.d4 d5 3.Nd2

Petroff Defense

54.3%

35 Games·Wins

1.e4 e5 2.Nf3 Nf6

Critical Blunders

Tactical errors analyzed with Stockfish

10 errors

▶

#61Ra1+??

Endgame

vs Yuffa

OTB·2025

▶

#71Nb6??

Endgame

vs Martirosyan

OTB·2025

▶

#27Nb3??

Tactics

vs Shandrygin

OTB·2025

▶

#40Rc8+??

Tactics

vs Movahed

OTB·2025

▶

#34Qf4??

Tactics

vs Papasimakopoulos

OTB·2025

▶

#62Kxh3??

Endgame

vs Kocharin

OTB·2025

▶

#54Kg7??

Endgame

vs Ragger

OTB·2025

▶

#47a6??

Endgame

vs Roebers

OTB·2025

▶

#30Bf1??

Tactics

vs Hakobyan

OTB·2025

▶

#29Ne2??

Tactics

vs Obregon Rivero

OTB·2025

Endgame StatisticsPRO

Analyzing...

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

801 Games

54%20%26%

Move	Games	Performance	%
1.e4	401		59%
1.Nf3	192		68%
1.c4 Strong	96		73%
1.d4	89		64%
1.a3 Strong	9		89%
1.g3	4		50%
1.b3 Strong	4		100%
1.a4 Strong	2		100%
1.e3 Strong	1		100%
1.f4	1		50%
1.Nc3 Weak	1		0%
1.f3 Strong	1		100%

1.e4

59%

401

1.Nf3

68%

192

1.c4

73%

96

1.d4

64%

89

1.a3

89%

9

1.g3

50%

4

1.b3

100%

4

1.a4

100%

2

1.e3

100%

1

1.f4

50%

1

1.Nc3

0%

1

1.f3

100%

1

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