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

Zemlyanskii, Ivan

RUS RUS·Born 2010·FIDE #24249971·646 Games

Classical2594441 Games

Rapid2564124 Games

Blitz2554146 Games

Statistics

646

Total

291

Wins

196

Draws

158

Losses

45%30%24%

Play Style

What you need to know before facing them

Elite accuracy: 94.0% average

Solid conversion: 81%

Very consistent (91%)

Very precise: only 0.0 blunders/game

Dominates 1.d4 ♔ (68% in 133 games)

Vulnerable to 1.c4 ♔ (only 46%)

Deep Analysis

Stockfish 18 · Classical games · 330 analyzed

Accuracy by phase

Opening96.9%

Middlegame93.5%

Endgame95.6%

Clutch Factor

Performance under pressure

+4%

Winning (+2 or more)95%

125 Games

Equal position95%

123 Games

Losing (-2 or more)91%

82 Games

Problematic Pieces

Which pieces cause most errors?

♖

26%

66 errors

♕

22%

55 errors

♙

19%

47 errors

♞

13%

33 errors

♗

11%

29 errors

♔

9%

24 errors

Critical Moment

When does the first serious error occur?

Move 40average

1-15

16-25

26-35

36-45

46+

62% of blunders occur between move 26-35. Keep tension until that moment.

Error Heatmap

Where do most errors occur?

7

12

10

9

7

10

8

7

7

12

abcdefgh

Many

Few

Critical squares

e312 err

f612 err

d410 err

d510 err

e59 err

e3/f6 concentrate most errors. Force decisions in those zones.

Recent Games

L

Zverev, Lev2453

World Blitz 2025 · 30 Dec 2025

0-1

L

Le, Quang Liem2731

World Blitz 2025 · 30 Dec 2025

0-1

W

Gavrilescu, David2542

World Blitz 2025 · 30 Dec 2025

0-1

W

Mendonca, Leon Luke2615

World Blitz 2025 · 30 Dec 2025

1-0

W

Movahed, Sina2596

World Blitz 2025 · 30 Dec 2025

1-0

L

Pranav Anand2591

World Blitz 2025 · 30 Dec 2025

1-0

Openings

Based on player games

Weaknesses

EXPLOIT!

White

French: Advance

41.2%

17 Games·Loses

1.e4 e6 2.d4 d5 3.e5

Black

No significant weaknesses detected as Black

Strengths

AVOID

White

Caro-Kann: Advance

87.5%

16 Games·Wins

1.e4 c6 2.d4 d5 3.e5

King's Indian: Main Line

63.6%

11 Games·Wins

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

Black

No consistent strengths detected as Black

Critical Blunders

Tactical errors analyzed with Stockfish

10 errors

▶

#73Ne6+??

Endgame

vs Le

Blitz·2025

▶

#31Ng4??

Tactics

vs Gavrilescu

Blitz·2025

▶

#46Qe7??

Endgame

vs Pranav Anand

Blitz·2025

▶

#21Bxg6??

Tactics

vs Movahed

Blitz·2025

▶

#49Qf7??

Endgame

vs Zverev

Blitz·2025

▶

#35Qh5??

Tactics

vs Klukin

Blitz·2025

▶

#44Qb4??

Endgame

vs Xiao

Blitz·2025

▶

#23Ba5??

Tactics

vs Khubukshanov

Blitz·2025

▶

#26Nxe4??

Tactics

vs Firouzja

Rapid·2025

▶

#27Bh7??

Tactics

vs Nihal Sarin

Blitz·2025

Endgame Statistics

23 endgame categories analyzed — discover where they collapse under pressure

Repertoire

☰ All

♟ Classical

⚡ Rapid

🔥 Blitz

PRO

·

2025

2024

2023

2022

2021

2020

PRO

8

7

6

5

4

3

2

1a

b

c

d

e

f

g

h

Starting Position

336 Games

51%27%22%

Move	Games	Performance	%
1.e4	191		64%
1.d4	133		68%
1.c4	12		46%

1.e4

64%

191

1.d4

68%

133

1.c4

46%

12

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