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

GM

Bok, Benjamin

NED NED·Born 1995·FIDE #1017063·4,888 Games

Classical25604,263 Games

Rapid2561328 Games

Blitz2633323 Games

Statistics

4888

Total

2585

Wins

1250

Draws

1052

Losses

53%26%22%

Play Style

What you need to know before facing them

Elite accuracy: 93.3% average

Solid conversion: 84%

Very consistent (84%)

Very precise: only 0.1 blunders/game

Dominates 1.c4 ♔ (74% in 201 games)

Vulnerable to 1.g3 ♚ (only 41%)

Deep Analysis

Stockfish 18 · Classical games · 484 analyzed

Accuracy by phase

Opening97.0%

Middlegame93.8%

Endgame95.5%

Clutch Factor

Performance under pressure

+6%

Winning (+2 or more)94%

191 Games

Equal position95%

194 Games

Losing (-2 or more)88%

99 Games

Problematic Pieces

Which pieces cause most errors?

♖

24%

100 errors

♙

17%

74 errors

♔

16%

69 errors

♕

15%

64 errors

♗

14%

60 errors

♞

13%

57 errors

Critical Moment

When does the first serious error occur?

Move 41average

1-15

16-25

26-35

36-45

46+

38% of blunders occur between move 36-45. Keep tension until that moment.

Error Heatmap

Where do most errors occur?

11

12

11

11

16

10

20

10

17

11

abcdefgh

Many

Few

Critical squares

f520 err

e417 err

d516 err

d612 err

e711 err

f5/e4 concentrate most errors. Force decisions in those zones.

Recent Games

W

Kosakowski, Jakub2550

Titled Tue 26th May 2026 · 26 May 2026

0-1

W

Dubnevych, Maksym2350

Titled Tue 26th May 2026 · 26 May 2026

1-0

L

Nosach, Roman Al2310

Titled Tue 26th May 2026 · 26 May 2026

1-0

W

Movahed, Sina2575

Titled Tue 26th May 2026 · 26 May 2026

1-0

W

Martinez Ramirez, Lennis2395

Titled Tue 26th May 2026 · 26 May 2026

0-1

W

Nguyen Hong Nhung2266

Titled Tue 26th May 2026 · 26 May 2026

1-0

Openings

Based on player games

Weaknesses

EXPLOIT!

White

No significant weaknesses detected as White

Black

No significant weaknesses detected as Black

Strengths

AVOID

White

Nimzo-Indian: Classical

61.0%

310 Games·Wins

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2

Queen's Gambit Declined

65.3%

202 Games·Wins

1.d4 d5 2.c4 e6

Black

Sicilian: d6 Systems

59.9%

521 Games·Wins

1.e4 c5 2.Nf3 d6

London System

60.0%

30 Games·Wins

1.d4 Nf6 2.Bf4 d5

Critical Blunders

Tactical errors analyzed with Stockfish

10 errors

▶

#58Ra2??

Endgame

vs Ambartsumian

OTB·2025

▶

#56h6??

Endgame

vs Tikhonov

OTB·2025

▶

#51d7??

Endgame

vs Terry

OTB·2025

▶

#53f4??

Endgame

vs Lazavik

OTB·2025

▶

#38Qc4??

Tactics

vs Fus

OTB·2025

▶

#35Rf2??

Tactics

vs Bosboom

Blitz·2025

▶

#36Ne4??

Tactics

vs Van Batenburg

OTB·2025

▶

#37Nxg7??

Tactics

vs Schoorl

Blitz·2025

▶

#26Qb3??

Tactics

vs Loek Van Wely

Blitz·2025

▶

#59Nd2??

Endgame

vs Zhu

Blitz·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

2482 Games

58%24%18%

Move	Games	Performance	%
1.d4 Strong	1435		71%
1.e4	611		66%
1.Nf3 Strong	234		71%
1.c4 Strong	201		74%
1.b3	1		50%

1.d4

71%

1435

1.e4

66%

611

1.Nf3

71%

234

1.c4

74%

201

1.b3

50%

1

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