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

Grandelius, Nils

SWE SWE·Born 1993·FIDE #1710400·4,122 Games

Classical26473,739 Games

Rapid2611163 Games

Blitz2575242 Games

Statistics

4122

Total

1914

Wins

1390

Draws

816

Losses

46%34%20%

Play Style

What you need to know before facing them

Elite accuracy: 94.5% average

Solid conversion: 91%

Very consistent (92%)

Very precise: only 0.0 blunders/game

Dominates 1.c4 ♔ (74% in 209 games)

Deep Analysis

Stockfish 18 · Classical games · 778 analyzed

Accuracy by phase

Opening96.9%

Middlegame94.3%

Endgame95.7%

Clutch Factor

Performance under pressure

+5%

Winning (+2 or more)95%

161 Games

Equal position96%

258 Games

Losing (-2 or more)91%

81 Games

Problematic Pieces

Which pieces cause most errors?

♙

24%

67 errors

♖

20%

55 errors

♕

17%

48 errors

♗

15%

41 errors

♞

13%

35 errors

♔

11%

29 errors

Critical Moment

When does the first serious error occur?

Move 46average

1-15

16-25

26-35

36-45

46+

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

Error Heatmap

Where do most errors occur?

7

7

7

12

9

10

9

7

11

8

abcdefgh

Many

Few

Critical squares

a512 err

e211 err

e410 err

d59 err

f49 err

a5/e2 concentrate most errors. Force decisions in those zones.

Recent Games

D

Wadsworth, Matthew J2529

Titled Tue 26th May 2026 · 26 May 2026

½-½

W

Askarov, Bakhtiyar2291

Titled Tue 26th May 2026 · 26 May 2026

0-1

L

Domin, Yan2282

Titled Tue 26th May 2026 · 26 May 2026

0-1

L

Pidluznij, Gleb2401

Titled Tue 26th May 2026 · 26 May 2026

1-0

W

Bersamina, Paulo2423

Titled Tue 26th May 2026 · 26 May 2026

0-1

W

Lisenkov, Svyatoslav2363

Titled Tue 26th May 2026 · 26 May 2026

1-0

Openings

Based on player games

Weaknesses

EXPLOIT!

White

No significant weaknesses detected as White

Black

No significant weaknesses detected as Black

Strengths

AVOID

White

Reti vs King's Indian

88.5%

26 Games·Wins

1.Nf3 Nf6 2.c4 g6

English: Anglo-Indian

72.7%

11 Games·Wins

1.c4 Nf6 2.Nc3 g6

Black

Queen's Gambit Declined

52.9%

138 Games·Wins

1.d4 d5 2.c4 e6

Sicilian: e6 Systems

52.8%

127 Games·Wins

1.e4 c5 2.Nf3 e6

Critical Blunders

Tactical errors analyzed with Stockfish

10 errors

▶

#32Qxf2+??

Tactics

vs Goutham Krishna H

Blitz·2025

▶

#26f4??

Tactics

vs Gurel

Blitz·2025

▶

#37Ne3??

Tactics

vs Esipenko

Blitz·2025

▶

#34Nc8??

Tactics

vs Sadhwani

Blitz·2025

▶

#52Ke5??

Endgame

vs Zverev

Blitz·2025

▶

#37Rxe7??

Tactics

vs Gaehwiler

Blitz·2025

▶

#40Rxc3+??

Tactics

vs Duda

Blitz·2025

▶

#42Nh2+??

Endgame

vs Isanzhulov

Blitz·2025

▶

#35Qh6??

Tactics

vs Iniyan

Rapid·2025

▶

#19Qe5??

Tactics

vs Kosakowski

Blitz·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

2071 Games

51%32%17%

Move	Games	Performance	%
1.e4	823		65%
1.d4	506		67%
1.Nf3	502		69%
1.c4 Strong	209		74%
1.g3 Strong	17		71%
1.b3	11		55%
1.Nc3 Strong	1		100%
1.b4 Weak	1		0%
1.c3 Strong	1		100%

1.e4

65%

823

1.d4

67%

506

1.Nf3

69%

502

1.c4

74%

209

1.g3

71%

17

1.b3

55%

11

1.Nc3

100%

1

1.b4

0%

1

1.c3

100%

1

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