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

Iskusnyh, Sergei

RUS RUS·Born 1974·FIDE #4120027·4,116 Games

Classical24404,050 Games

Rapid228440 Games

Blitz238626 Games

Statistics

4116

Total

2015

Wins

728

Draws

1373

Losses

49%18%33%

Play Style

What you need to know before facing them

Elite accuracy: 90.0% average

Plays 3.5% better with white

Low resilience (25%): Doesn't save lost positions

Very precise: only 0.2 blunders/game

Dominates 1.Nf3 ♔ (65% in 93 games)

Vulnerable to 1.g3 ♚ (only 30%)

Deep Analysis

Stockfish 18 · Classical games · 73 analyzed

Accuracy by phase

Opening96.6%

Middlegame92.2%

Endgame94.2%

Clutch Factor

Performance under pressure

+9%

Winning (+2 or more)94%

25 Games

Equal position94%

13 Games

Losing (-2 or more)85%

35 Games

Problematic Pieces

Which pieces cause most errors?

♖

26%

27 errors

♕

19%

19 errors

♙

18%

18 errors

♞

15%

15 errors

♗

12%

12 errors

♔

11%

11 errors

Critical Moment

When does the first serious error occur?

Move 28average

1-15

16-25

26-35

36-45

46+

43% of blunders occur between move 16-25. Keep tension until that moment.

Error Heatmap

Where do most errors occur?

3

4

3

4

4

4

4

3

3

4

abcdefgh

Many

Few

Critical squares

c44 err

d44 err

d74 err

e14 err

e64 err

c4/d4 concentrate most errors. Force decisions in those zones.

Recent Games

W

Regoli, Stephane2242

Titled Tue 26th May 2026 · 26 May 2026

0-1

L

Devaev, Alexander2306

Titled Tue 26th May 2026 · 26 May 2026

0-1

L

Ivashentseva, Dominika2095

Titled Tue 26th May 2026 · 26 May 2026

1-0

W

Silva Lucena, Cristian2211

Titled Tue 26th May 2026 · 26 May 2026

1-0

W

Mirzhanov, Arlan1954

Titled Tue 26th May 2026 · 26 May 2026

1-0

W

Badrinath, S.2202

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

Queen's Gambit Declined

57.4%

242 Games·Wins

1.d4 d5 2.c4 e6

Black

English vs 1...e5

73.3%

15 Games·Wins

1.c4 e5 2.Nc3 Bb4

French: Classical

47.8%

253 Games·Wins

1.e4 e6 2.d4 d5 3.Nc3 Nf6

Critical Blunders

Tactical errors analyzed with Stockfish

10 errors

▶

#41Rxg4??

Endgame

vs Vastrukhin

Rapid·2025

▶

#55Qe6??

Endgame

vs Zakhartsov

Rapid·2024

▶

#21Rh1+??

Tactics

vs Obgolts

Rapid·2024

▶

#28Qe7??

Tactics

vs Kaidanov

OTB·2024

▶

#23Bxc4??

Tactics

vs Ibrahimov

OTB·2024

▶

#19e5??

Tactics

vs Volokitin

OTB·2024

▶

#25Rxb2??

Tactics

vs Tsydypov

OTB·2024

▶

#26Rbe8??

Tactics

vs Flores

OTB·2024

▶

#28Ne2??

Tactics

vs Rakotomaharo

OTB·2023

▶

#16d4??

Tactics

vs Kosteniuk

OTB·2023

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

2094 Games

53%18%29%

Move	Games	Performance	%
1.d4	1931		62%
1.Nf3	93		65%
1.c4	42		48%
1.e4	28		46%

1.d4

62%

1931

1.Nf3

65%

93

1.c4

48%

42

1.e4

46%

28

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