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

Alonso Rosell, Alvar

ESP ESP·Born 1992·FIDE #2270544·2,137 Games

Classical25601,839 Games

Rapid2503182 Games

Blitz2570140 Games

Statistics

2137

Total

1065

Wins

543

Draws

525

Losses

50%25%25%

Play Style

What you need to know before facing them

Elite accuracy: 93.8% average

Solid conversion: 88%

Very consistent (89%)

Very precise: only 0.1 blunders/game

Dominates 1.c4 ♔ (74% in 19 games)

Deep Analysis

Stockfish 18 · Classical games · 313 analyzed

Accuracy by phase

Opening96.8%

Middlegame93.5%

Endgame94.9%

Clutch Factor

Performance under pressure

+6%

Winning (+2 or more)95%

113 Games

Equal position95%

140 Games

Losing (-2 or more)89%

60 Games

Problematic Pieces

Which pieces cause most errors?

♙

22%

47 errors

♖

21%

44 errors

♞

17%

35 errors

♕

16%

33 errors

♗

15%

32 errors

♔

9%

20 errors

Critical Moment

When does the first serious error occur?

Move 37average

1-15

16-25

26-35

36-45

46+

40% of blunders occur between move 26-35. Keep tension until that moment.

Error Heatmap

Where do most errors occur?

5

6

6

8

7

8

11

6

5

6

abcdefgh

Many

Few

Critical squares

g411 err

d48 err

g58 err

c47 err

c36 err

g4/d4 concentrate most errors. Force decisions in those zones.

Recent Games

W

Mayta Aiza, Maveric2217

Titled Tue 12th May 2026 · 12 May 2026

0-1

L

Sathvik Adiga2400

Titled Tue 12th May 2026 · 12 May 2026

1-0

W

Luong Phuong Hanh2282

Titled Tue 12th May 2026 · 12 May 2026

0-1

L

Sarana, Alexey2664

Titled Tue 12th May 2026 · 12 May 2026

0-1

W

Movahed, Sina2575

Titled Tue 12th May 2026 · 12 May 2026

0-1

L

Bortnyk, Olexandr2604

Titled Tue 12th May 2026 · 12 May 2026

0-1

Openings

Based on player games

Weaknesses

EXPLOIT!

White

Sicilian: d6 Systems

55.6%

9 GamesLow sample·Loses

1.e4 c5 2.Nf3 d6

Black

Sicilian: 2...Nc6

55.6%

9 GamesLow sample·Loses

1.e4 c5 2.Nf3 Nc6

Strengths

AVOID

White

King's Indian

60.0%

95 Games·Wins

1.d4 Nf6 2.c4 g6

Grünfeld

66.7%

18 Games·Wins

1.d4 Nf6 2.c4 g6 3.Nc3 d5

Black

Ruy Lopez: Steinitz Deferred

52.3%

44 Games·Wins

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6

Caro-Kann: Main Line

53.6%

28 Games·Wins

1.e4 c6 2.d4 d5 3.Nc3 dxe4

Critical Blunders

Tactical errors analyzed with Stockfish

10 errors

▶

#66e6+??

Endgame

vs Eljanov

OTB·2025

▶

#30Rg8??

Tactics

vs Oro

OTB·2025

▶

#35Qxg2+??

Tactics

vs Hovhannisyan

OTB·2025

▶

#27Be1??

Tactics

vs Tudor

OTB·2025

▶

#51f5??

Endgame

vs Papasimakopoulos

Blitz·2024

▶

#43Qf5??

Endgame

vs Druckenthaner

Blitz·2024

▶

#46e6??

Endgame

vs Peyrer

Blitz·2024

▶

#44e4??

Endgame

vs Pichot

Blitz·2024

▶

#31Rc2??

Tactics

vs Domalchuk-Jonasson

Blitz·2024

▶

#25Rfe1??

Tactics

vs Dvirnyy

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

1091 Games

54%25%21%

Move	Games	Performance	%
1.d4	845		67%
1.Nf3 Strong	131		71%
1.e4	89		57%
1.c4 Strong	19		74%
1.f4 Strong	4		75%
1.a3 Strong	2		75%
1.g3 Strong	1		100%

1.d4

67%

845

1.Nf3

71%

131

1.e4

57%

89

1.c4

74%

19

1.f4

75%

4

1.a3

75%

2

1.g3

100%

1

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