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

Pulpan, Jakub

CZE CZE·Born 1998·FIDE #302759·1,970 Games

Classical24131,642 Games

Rapid2505193 Games

Blitz2553135 Games

Statistics

1970

Total

897

Wins

599

Draws

471

Losses

46%30%24%

Play Style

What you need to know before facing them

Elite accuracy: 94.3% average

High resilience (59%): Dangerous even when losing

Solid conversion: 88%

Very consistent (92%)

Very precise: only 0.0 blunders/game

Dominates 1.b3 ♔ (86% in 14 games)

Vulnerable to 1.g3 ♚ (only 10%)

Deep Analysis

Stockfish 18 · Classical games · 411 analyzed

Accuracy by phase

Opening96.5%

Middlegame93.9%

Endgame96.1%

Clutch Factor

Performance under pressure

+4%

Winning (+2 or more)95%

172 Games

Equal position95%

185 Games

Losing (-2 or more)90%

54 Games

Problematic Pieces

Which pieces cause most errors?

♖

21%

55 errors

♙

20%

54 errors

♕

19%

51 errors

♗

14%

38 errors

♞

14%

36 errors

♔

12%

32 errors

Critical Moment

When does the first serious error occur?

Move 47average

1-15

16-25

26-35

36-45

46+

56% of blunders occur between move 46+. Keep tension until that moment.

Error Heatmap

Where do most errors occur?

7

7

10

8

11

11

7

10

11

8

abcdefgh

Many

Few

Critical squares

d511 err

e511 err

g411 err

f410 err

f610 err

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

Recent Games

L

Dardha, Daniel2602

TCh-AUT Rapid 2026 · 17 May 2026

0-1

W

Danielian, Elina2390

TCh-AUT Rapid 2026 · 17 May 2026

1-0

L

Reprintsev, Alexander2288

TCh-AUT Rapid 2026 · 17 May 2026

1-0

W

Ernst, Robert2402

TCh-AUT Rapid 2026 · 17 May 2026

1-0

W

Webersdorfer,Thomas1962

TCh-AUT Rapid 2026 · 17 May 2026

0-1

W

Nasuta, Grzegorz2498

TCh-AUT Blitz 2026 · 16 May 2026

1-0

Openings

Based on player games

Weaknesses

EXPLOIT!

White

English: Anglo-Indian

50.0%

8 GamesLow sample·Loses

1.c4 Nf6 2.Nc3 g6

Black

Reti: KIA

62.5%

8 GamesLow sample·Loses

1.Nf3 d5 2.g3 g6

Strengths

AVOID

White

Sicilian: Kan

55.6%

18 Games·Wins

1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6

Black

Sicilian: e6 Systems

66.7%

18 Games·Wins

1.e4 c5 2.Nf3 e6

Ruy Lopez: Morphy

54.5%

33 Games·Wins

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

Critical Blunders

Tactical errors analyzed with Stockfish

10 errors

▶

#20Rxf6??

Tactics

vs Shagbazyan

Blitz·2025

▶

#11Ba6??

Tactics

vs Gnojek

Blitz·2025

▶

#53Ke7??

Endgame

vs Navara

Blitz·2025

▶

#18Nd7??

Tactics

vs Babula

Blitz·2025

▶

#36Bf2??

Tactics

vs Ernst

OTB·2025

▶

#41Rb5??

Endgame

vs Jiruse

OTB·2025

▶

#20Bc5??

Tactics

vs Molik

OTB·2025

▶

#27f4??

Tactics

vs Sabol

OTB·2025

▶

#75Qb1??

Endgame

vs Flajsman

Rapid·2025

▶

#38Bf2??

Tactics

vs Vymazal

Rapid·2025

Endgame Statistics

22 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

988 Games

48%31%21%

Move	Games	Performance	%
1.e4	513		63%
1.Nf3	257		65%
1.d4	94		60%
1.c4	65		59%
1.b3 Strong	14		86%
1.a3	12		63%
1.h3 Strong	8		81%
1.Nc3	8		69%
1.Na3	5		40%
1.g3 Strong	3		100%
1.c3 Strong	3		100%
1.a4	3		67%
1.d3	2		50%
1.f4 Weak	1		0%

1.e4

63%

513

1.Nf3

65%

257

1.d4

60%

94

1.c4

59%

65

1.b3

86%

14

1.a3

63%

12

1.h3

81%

8

1.Nc3

69%

8

1.Na3

40%

5

1.g3

100%

3

1.c3

100%

3

1.a4

67%

3

1.d3

50%

2

1.f4

0%

1

🍪 Cookies · Chess Stalker uses technical cookies (required for operation) and analytical cookies (to improve the service). Analytical cookies are optional.