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

Har-Zvi, Ronen

ISR ISR·Born 1976·FIDE #2801485·456 Games

Classical2513437 Games

Rapid—17 Games

Blitz25232 Games

Statistics

456

Total

175

Wins

190

Draws

91

Losses

38%42%20%

Play Style

What you need to know before facing them

Elite accuracy: 90.1% average

Plays 2.2% better with black

Very consistent (89%)

Very precise: only 0.1 blunders/game

Dominates 1.Nf3 ♔ (67% in 84 games)

Vulnerable to 1.c4 ♚ (only 46%)

Deep Analysis

Stockfish 18 · Classical games · 12 analyzed

Accuracy by phase

Opening96.0%

Middlegame90.5%

Endgame92.4%

Clutch Factor

Performance under pressure

+4%

Winning (+2 or more)90%

5 Games

Equal position94%

3 Games

Losing (-2 or more)87%

4 Games

Problematic Pieces

Which pieces cause most errors?

♖

32%

6 errors

♙

26%

5 errors

♕

16%

3 errors

♔

11%

2 errors

♞

11%

2 errors

♗

5%

1 errors

Critical Moment

When does the first serious error occur?

Move 38average

1-15

16-25

26-35

36-45

46+

100% of blunders occur between move 36-45. Keep tension until that moment.

Error Heatmap

Where do most errors occur?

1

2

1

1

1

1

1

1

1

1

abcdefgh

Many

Few

Critical squares

e62 err

c61 err

d31 err

d51 err

e11 err

e6/c6 concentrate most errors. Force decisions in those zones.

Recent Games

W

Galchenko, Matvey2435

Titled Tue 19th Aug Early · 19 Aug 2025

1-0

L

Mikhailovsky, Vladimir2215

Titled Tue 19th Aug Early · 19 Aug 2025

1-0

W

Ivanov,Andrey A.2106

Titled Tue 19th Aug Early · 19 Aug 2025

0-1

L

Sarana, Alexey2691

Titled Tue 19th Aug Early · 19 Aug 2025

0-1

W

Makarian, Rudik2549

Titled Tue 19th Aug Early · 19 Aug 2025

0-1

W

Daneshvar, Bardiya2625

Titled Tue 19th Aug Early · 19 Aug 2025

0-1

Openings

Based on player games

Weaknesses

EXPLOIT!

White

No significant weaknesses detected as White

Black

No significant weaknesses detected as Black

Strengths

AVOID

White

No consistent strengths detected as White

Black

Caro-Kann

58.3%

12 Games·Wins

1.e4 c6 2.d4 d5

Critical Blunders

Tactical errors analyzed with Stockfish

2 errors

▶

#38Rh5??

Tactics

vs Abdusattorov

Blitz·2021

▶

#14e5??

Tactics

vs Polgar

Blitz

Endgame Statistics

9 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

224 Games

42%43%15%

Move	Games	Performance	%
1.e4	89		62%
1.Nf3	84		67%
1.c4	42		61%
1.d4	7		43%
1.h3	1		50%
1.h4 Strong	1		100%

1.e4

62%

89

1.Nf3

67%

84

1.c4

61%

42

1.d4

43%

7

1.h3

50%

1

1.h4

100%

1

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