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

Petrov, Martin

BUL BUL·Born 2000·FIDE #2911086·1,421 Games

Classical25471,375 Games

Rapid252440 Games

Blitz24226 Games

Statistics

1421

Total

610

Wins

522

Draws

285

Losses

43%37%20%

Play Style

What you need to know before facing them

Elite accuracy: 94.6% average

Solid conversion: 86%

Very consistent (91%)

Very precise: only 0.0 blunders/game

Dominates 1.Nf3 ♔ (84% in 35 games)

Vulnerable to 1.c4 ♚ (only 42%)

Deep Analysis

Stockfish 18 · Classical games · 495 analyzed

Accuracy by phase

Opening97.1%

Middlegame94.6%

Endgame95.7%

Clutch Factor

Performance under pressure

+6%

Winning (+2 or more)95%

219 Games

Equal position95%

218 Games

Losing (-2 or more)90%

55 Games

Problematic Pieces

Which pieces cause most errors?

♖

25%

61 errors

♙

17%

43 errors

♕

17%

42 errors

♗

15%

36 errors

♔

13%

33 errors

♞

13%

32 errors

Critical Moment

When does the first serious error occur?

Move 37average

1-15

16-25

26-35

36-45

46+

33% of blunders occur between move 26-35. Keep tension until that moment.

Error Heatmap

Where do most errors occur?

8

7

9

7

7

6

7

8

8

6

abcdefgh

Many

Few

Critical squares

b59 err

d78 err

e38 err

e48 err

c67 err

b5/d7 concentrate most errors. Force decisions in those zones.

Recent Games

W

Vedmediuc, Serghei2424

Grand Prix Bucharest 2026 · 10 May 2026

1-0

L

Ivanchuk, Vasyl2634

Grand Prix Bucharest 2026 · 10 May 2026

1-0

L

Enchev, Ivajlo2400

Grand Prix Bucharest 2026 · 10 May 2026

1-0

W

Baranciuc, Alexandr2315

Grand Prix Bucharest 2026 · 10 May 2026

0-1

W

Filip, Lucian-Ioan2313

Grand Prix Bucharest 2026 · 10 May 2026

1-0

W

Vafiadis, Catalin-Gabriel1698

Grand Prix Bucharest 2026 · 9 May 2026

0-1

Openings

Based on player games

Weaknesses

EXPLOIT!

White

No significant weaknesses detected as White

Black

English: Symmetrical

70.0%

10 Games·Loses

1.c4 c5 2.Nc3 Nc6

Reti: Double Fianchetto

60.0%

15 Games·Loses

1.Nf3 Nf6 2.g3 d5

Strengths

AVOID

White

Sicilian: Dragon

66.7%

12 Games·Wins

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6

Caro-Kann: Advance

60.0%

50 Games·Wins

1.e4 c6 2.d4 d5 3.e5

Black

Sicilian: Alapin

72.7%

11 Games·Wins

1.e4 c5 2.c3 Nf6

Nimzo-Indian: Classical

60.0%

15 Games·Wins

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2

Critical Blunders

Tactical errors analyzed with Stockfish

10 errors

▶

#65Re3??

Endgame

vs Kozhuharov

OTB·2025

▶

#12e5??

Tactics

vs Wachinger

Rapid·2025

▶

#24Qc3??

Tactics

vs Marzakov

Blitz·2025

▶

#48Bxc3??

Endgame

vs Ozen

Rapid·2025

▶

#45Kd2??

Endgame

vs Dardha

OTB·2025

▶

#40Bb5??

Endgame

vs Alonso

OTB·2025

▶

#27Rc7??

Tactics

vs Alexakis

OTB·2025

▶

#34Rg6??

Tactics

vs Favaloro

OTB·2025

▶

#43Ke4??

Endgame

vs Pultinevicius

OTB·2025

▶

#38f5??

Endgame

vs Giri

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

703 Games

46%39%15%

Move	Games	Performance	%
1.e4	582		65%
1.c4	57		61%
1.Nf3 Strong	35		84%
1.d4	28		70%
1.b3 Strong	1		100%

1.e4

65%

582

1.c4

61%

57

1.Nf3

84%

35

1.d4

70%

28

1.b3

100%

1

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