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

Mastrovasilis, Dimitrios

GRE GRE·Born 1983·FIDE #4202694·2,277 Games

Classical25252,067 Games

Rapid2515130 Games

Blitz2531101 Games

Statistics

2277

Total

962

Wins

958

Draws

356

Losses

42%42%16%

Play Style

What you need to know before facing them

Elite accuracy: 95.0% average

Solid conversion: 81%

Very consistent (93%)

Very precise: only 0.0 blunders/game

Dominates 1.c4 ♔ (82% in 14 games)

Deep Analysis

Stockfish 18 · Classical games · 371 analyzed

Accuracy by phase

Opening96.8%

Middlegame94.3%

Endgame96.0%

Clutch Factor

Performance under pressure

+4%

Winning (+2 or more)95%

130 Games

Equal position96%

194 Games

Losing (-2 or more)91%

47 Games

Problematic Pieces

Which pieces cause most errors?

♖

25%

46 errors

♙

18%

33 errors

♕

18%

33 errors

♗

13%

24 errors

♞

13%

24 errors

♔

12%

22 errors

Critical Moment

When does the first serious error occur?

Move 35average

1-15

16-25

26-35

36-45

46+

33% of blunders occur between move 16-25. Keep tension until that moment.

Error Heatmap

Where do most errors occur?

8

6

6

6

6

5

6

5

6

5

abcdefgh

Many

Few

Critical squares

d68 err

b46 err

b56 err

c26 err

e26 err

d6/b4 concentrate most errors. Force decisions in those zones.

Recent Games

D

Talu, Mircea2399

Grand Prix Bucharest 2026 · 10 May 2026

½-½

W

Lu, Miaoyi2435

Grand Prix Bucharest 2026 · 10 May 2026

0-1

L

Martinez Alcantara, Jose Eduardo2650

Grand Prix Bucharest 2026 · 10 May 2026

1-0

W

Manea, Alexandru2297

Grand Prix Bucharest 2026 · 10 May 2026

1-0

W

Sachilaru, Alexandru2347

Grand Prix Bucharest 2026 · 10 May 2026

1-0

D

Stoyanov, Tsvetan2445

Grand Prix Bucharest 2026 · 10 May 2026

½-½

Openings

Based on player games

Weaknesses

EXPLOIT!

White

Sicilian: Closed

63.6%

11 Games·Loses

1.e4 c5 2.Nc3 Nc6

Black

No significant weaknesses detected as Black

Strengths

AVOID

White

Sicilian: Sveshnikov

73.3%

15 Games·Wins

1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 e5

Caro-Kann: Advance

66.7%

45 Games·Wins

1.e4 c6 2.d4 d5 3.e5

Black

Sicilian: e6 Systems

52.8%

231 Games·Wins

1.e4 c5 2.Nf3 e6

Reti: Reversed London

46.7%

15 Games·Wins

1.Nf3 d5 2.g3 c6

Critical Blunders

Tactical errors analyzed with Stockfish

10 errors

▶

#13Kf8??

Tactics

vs Zafeiriou

Rapid·2025

▶

#40Qc2??

Tactics

vs Giri

OTB·2025

▶

#52Kd7??

Endgame

vs Meers

OTB·2025

▶

#13O-O??

Tactics

vs Krallis

Blitz·2024

▶

#60Kg2??

Endgame

vs Oliinyk

Blitz·2024

▶

#36Qc4+??

Tactics

vs Goraj

Blitz·2024

▶

#33Kg7??

Tactics

vs Narva

Blitz·2024

▶

#12Bf4??

Tactics

vs Lauda

Blitz·2024

▶

#15N1d2??

Tactics

vs Vyval

Blitz·2024

▶

#40Qe2??

Tactics

vs Trapp

Blitz·2024

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

1128 Games

48%40%12%

Move	Games	Performance	%
1.e4	1069		67%
1.Nf3 Strong	30		80%
1.c4 Strong	14		82%
1.d4	9		67%
1.g3 Strong	3		100%
1.a3 Strong	1		100%
1.b3 Strong	1		100%
1.f4	1		50%

1.e4

67%

1069

1.Nf3

80%

30

1.c4

82%

14

1.d4

67%

9

1.g3

100%

3

1.a3

100%

1

1.b3

100%

1

1.f4

50%

1

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