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

Deac, Bogdan-Daniel

ROU ROU·Born 2001·FIDE #1226380·5,948 Games

Classical26565,405 Games

Rapid2613248 Games

Blitz2649370 Games

Statistics

5948

Total

3295

Wins

1495

Draws

1158

Losses

55%25%19%

Play Style

What you need to know before facing them

Elite accuracy: 94.1% average

High resilience (56%): Dangerous even when losing

Solid conversion: 90%

Very consistent (87%)

Very precise: only 0.1 blunders/game

Dominates 1.b3 ♔ (88% in 266 games)

Deep Analysis

Stockfish 18 · Classical games · 825 analyzed

Accuracy by phase

Opening96.7%

Middlegame94.4%

Endgame95.9%

Clutch Factor

Performance under pressure

+5%

Winning (+2 or more)95%

189 Games

Equal position96%

251 Games

Losing (-2 or more)90%

60 Games

Problematic Pieces

Which pieces cause most errors?

♖

25%

72 errors

♕

19%

54 errors

♙

16%

44 errors

♗

13%

38 errors

♔

13%

38 errors

♞

13%

37 errors

Critical Moment

When does the first serious error occur?

Move 43average

1-15

16-25

26-35

36-45

46+

43% of blunders occur between move 36-45. Keep tension until that moment.

Error Heatmap

Where do most errors occur?

10

10

8

12

8

8

8

8

9

10

abcdefgh

Many

Few

Critical squares

e512 err

c610 err

d210 err

f810 err

g39 err

e5/c6 concentrate most errors. Force decisions in those zones.

Recent Games

W

Ter-Sahakyan, Samvel2613

1st 3-0 Thu 28th May 2026 · 28 May 2026

1-0

W

Suyarov, Mukhammadzokhid2534

1st 3-0 Thu 28th May 2026 · 28 May 2026

0-1

W

Vlassov, Nikolai2322

1st 3-0 Thu 28th May 2026 · 28 May 2026

1-0

W

Antonyan, Hamlet2108

1st 3-0 Thu 28th May 2026 · 28 May 2026

0-1

W

Gilfanov, Marat I2301

1st 3-0 Thu 28th May 2026 · 28 May 2026

0-1

D

Mahdavi, Reza2490

1st 3-0 Thu 28th May 2026 · 28 May 2026

½-½

Openings

Based on player games

Weaknesses

EXPLOIT!

White

King's Indian: Fianchetto

50.0%

8 GamesLow sample·Loses

1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Nf3

Black

Ruy Lopez: Open

52.4%

21 Games·Loses

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4

Strengths

AVOID

White

1.b3 e5 2.Bb2 Nc6

92.4%

66 Games·Wins

1.b3 e5 2.Bb2 Nc6

1.b3 e5 2.Bb2 d6

94.1%

17 Games·Wins

1.b3 e5 2.Bb2 d6

Black

Sicilian: d6 Systems

68.3%

101 Games·Wins

1.e4 c5 2.Nf3 d6

Sicilian: e6 Systems

67.0%

97 Games·Wins

1.e4 c5 2.Nf3 e6

Critical Blunders

Tactical errors analyzed with Stockfish

10 errors

▶

#25gxh6??

Tactics

vs Nakamura

OTB·2026

▶

#37Qh5??

Tactics

vs Harriott

OTB·2026

▶

#52Ng6??

Endgame

vs Aravindh

OTB·2026

▶

#44Nxd2??

Endgame

vs Sarana

OTB·2026

▶

#85Be4??

Endgame

vs Wang

OTB·2026

▶

#51Qe3??

Endgame

vs Wang

OTB·2026

▶

#42a4??

Endgame

vs Kollars

OTB·2026

▶

#61d6??

Endgame

vs Ashraf

OTB·2026

▶

#74Ne5+??

Endgame

vs Martinez Alcantara

OTB·2026

▶

#41Nxc5??

Endgame

vs Bharath Subramaniyam H

OTB·2026

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

3015 Games

59%24%17%

Move	Games	Performance	%
1.d4	1191		68%
1.Nf3 Strong	719		74%
1.e4	677		66%
1.b3 Strong	266		88%
1.c4	144		69%
1.g3 Strong	5		80%
1.h3	4		63%
1.a3 Strong	3		100%
1.a4 Strong	3		100%
1.h4 Weak	1		0%
1.f4 Strong	1		100%
1.e3 Strong	1		100%

1.d4

68%

1191

1.Nf3

74%

719

1.e4

66%

677

1.b3

88%

266

1.c4

69%

144

1.g3

80%

5

1.h3

63%

4

1.a3

100%

3

1.a4

100%

3

1.h4

0%

1

1.f4

100%

1

1.e3

100%

1

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