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

Ulko, Jaroslav

RUS RUS·Born 1973·FIDE #4116658·905 Games

Classical2437873 Games

Rapid231310 Games

Blitz233722 Games

Statistics

905

Total

403

Wins

242

Draws

260

Losses

45%27%29%

Play Style

What you need to know before facing them

Elite accuracy: 90.7% average

Very precise: only 0.1 blunders/game

Dominates 1.d4 ♔ (64% in 401 games)

Vulnerable to 1.Nf3 ♚ (only 45%)

Deep Analysis

Stockfish 18 · Classical games · 25 analyzed

Accuracy by phase

Opening95.5%

Middlegame92.0%

Endgame95.4%

Clutch Factor

Performance under pressure

+12%

Winning (+2 or more)95%

9 Games

Equal position95%

8 Games

Losing (-2 or more)83%

8 Games

Problematic Pieces

Which pieces cause most errors?

♖

28%

9 errors

♗

22%

7 errors

♕

22%

7 errors

♞

16%

5 errors

♔

9%

3 errors

♙

3%

1 errors

Critical Moment

When does the first serious error occur?

Move 32average

1-15

16-25

26-35

36-45

46+

100% of blunders occur between move 26-35. Keep tension until that moment.

Error Heatmap

Where do most errors occur?

2

3

1

1

2

2

2

1

1

1

abcdefgh

Many

Few

Critical squares

d63 err

b62 err

c42 err

d42 err

f22 err

d6/b6 concentrate most errors. Force decisions in those zones.

Recent Games

W

Bon, Michael2416

Titled Tuesday 2nd Nov · 2 Nov 2021

0-1

W

Legenia, Artem2092

Titled Tuesday 2nd Nov · 2 Nov 2021

0-1

L

Kovalenko,I2647

Titled Tuesday 2nd Nov · 2 Nov 2021

0-1

W

Plotnikov, Pavel2297

Titled Tuesday 2nd Nov · 2 Nov 2021

1-0

W

Navalgund, Niranjan2289

Titled Tuesday 2nd Nov · 2 Nov 2021

0-1

L

Klyashtorny, Vladislav2403

Titled Tuesday 2nd Nov · 2 Nov 2021

0-1

Openings

Based on player games

Weaknesses

EXPLOIT!

White

No significant weaknesses detected as White

Black

Reti vs King's Indian

72.7%

11 Games·Loses

1.Nf3 Nf6 2.c4 g6

Strengths

AVOID

White

Nimzo-Indian: Rubinstein

62.1%

29 Games·Wins

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3

Slav: Semi-Slav

56.8%

44 Games·Wins

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

Black

Sicilian: e6 Systems

49.1%

57 Games·Wins

1.e4 c5 2.Nf3 e6

Critical Blunders

Tactical errors analyzed with Stockfish

6 errors

▶

#27Rf3??

Tactics

vs Rustemov

Blitz·2021

▶

#33Qg5+??

Tactics

vs Matveeva

Blitz·2021

▶

#30Nec4??

Tactics

vs Lopez Del Alamo

Blitz·2021

▶

#44Kd7??

Endgame

vs Padmini

OTB·2019

▶

#34R1d6??

Tactics

vs Abdisalimov

OTB·2019

▶

#58Nh4??

Endgame

vs Grischuk

Blitz·2013

Endgame Statistics

12 endgame categories analyzed — discover where they collapse under pressure

Repertoire

☰ All

♟ Classical

⚡ Rapid

🔥 Blitz

PRO

·

2021

2019

2018

2016

2015

2014

PRO

8

7

6

5

4

3

2

1a

b

c

d

e

f

g

h

Starting Position

455 Games

49%28%23%

Move	Games	Performance	%
1.d4	401		64%
1.Nf3	32		59%
1.e4	18		53%
1.c4 Strong	2		100%
1.g3 Weak	1		0%
1.Nc3 Weak	1		0%

1.d4

64%

401

1.Nf3

59%

32

1.e4

53%

18

1.c4

100%

2

1.g3

0%

1

1.Nc3

0%

1

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