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

Kuzubov, Yuriy

UKR UKR·Born 1990·FIDE #14112906·3,912 Games

Classical26073,507 Games

Rapid2575230 Games

Blitz2522197 Games

Statistics

3912

Total

1943

Wins

1150

Draws

818

Losses

50%29%21%

Play Style

What you need to know before facing them

Elite accuracy: 93.5% average

High resilience (63%): Dangerous even when losing

Solid conversion: 85%

Very consistent (87%)

Very precise: only 0.1 blunders/game

Dominates 1.g3 ♔ (80% in 10 games)

Deep Analysis

Stockfish 18 · Classical games · 746 analyzed

Accuracy by phase

Opening96.6%

Middlegame93.8%

Endgame95.4%

Clutch Factor

Performance under pressure

+6%

Winning (+2 or more)95%

225 Games

Equal position96%

179 Games

Losing (-2 or more)89%

96 Games

Problematic Pieces

Which pieces cause most errors?

♖

22%

86 errors

♙

21%

81 errors

♞

20%

79 errors

♕

15%

57 errors

♔

12%

47 errors

♗

9%

36 errors

Critical Moment

When does the first serious error occur?

Move 45average

1-15

16-25

26-35

36-45

46+

42% of blunders occur between move 46+. Keep tension until that moment.

Error Heatmap

Where do most errors occur?

12

15

12

17

10

13

13

11

10

10

abcdefgh

Many

Few

Critical squares

e517 err

d615 err

e413 err

g513 err

c612 err

e5/d6 concentrate most errors. Force decisions in those zones.

Recent Games

W

Morard, Ambroise2058

Luc Winants Mem 2026 · 9 May 2026

1-0

W

Zatonskih, Anna2317

Luc Winants Mem 2026 · 9 May 2026

0-1

L

Korneev, Oleg2450

Luc Winants Mem 2026 · 9 May 2026

1-0

W

De Schampheleire, Glen2345

Luc Winants Mem 2026 · 9 May 2026

1-0

L

Edouard, Romain2538

Luc Winants Mem 2026 · 9 May 2026

1-0

W

Glek, Igor2423

Luc Winants Mem 2026 · 9 May 2026

1-0

Openings

Based on player games

Weaknesses

EXPLOIT!

White

No significant weaknesses detected as White

Black

Slav: Semi-Slav

66.7%

12 Games·Loses

1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3

Queen's Gambit Accepted

62.5%

8 GamesLow sample·Loses

1.d4 d5 2.c4 dxc4

Strengths

AVOID

White

King's Indian: Main Line

92.3%

13 Games·Wins

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

Reti: Double Fianchetto

72.7%

11 Games·Wins

1.Nf3 Nf6 2.g3 d5

Black

English: Four Knights

69.2%

13 Games·Wins

1.c4 e5 2.Nc3 Nf6

English vs 1...e5

66.7%

18 Games·Wins

1.c4 e5 2.Nc3 Bb4

Critical Blunders

Tactical errors analyzed with Stockfish

10 errors

▶

#46Bd6??

Endgame

vs Grischuk

OTB·2025

▶

#27Rfe7??

Tactics

vs Nihal Sarin

OTB·2025

▶

#60g6+??

Endgame

vs Vogel

OTB·2025

▶

#33Nc5??

Tactics

vs Yuffa

OTB·2025

▶

#39Bf4??

Tactics

vs Yakubboev

OTB·2025

▶

#56Rd2??

Endgame

vs Wojtaszek

OTB·2025

▶

#56Nd6??

Endgame

vs Krasenkow

Blitz·2025

▶

#28Rb1??

Tactics

vs Zalitis

Blitz·2025

▶

#59Be1??

Endgame

vs Larkin

Rapid·2025

▶

#65Qd4+??

Endgame

vs Grischuk

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

1964 Games

55%27%18%

Move	Games	Performance	%
1.d4	1447		69%
1.c4 Strong	176		71%
1.e4	174		65%
1.Nf3	157		68%
1.g3 Strong	10		80%

1.d4

69%

1447

1.c4

71%

176

1.e4

65%

174

1.Nf3

68%

157

1.g3

80%

10

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