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

Checa, Nicolas

USA USA·Born 2001·FIDE #2069342·728 Games

Classical2507728 Games

Rapid24160 Games

Blitz24990 Games

Statistics

728

Total

314

Wins

203

Draws

211

Losses

43%28%29%

Play Style

What you need to know before facing them

Elite accuracy: 94.3% average

Solid conversion: 91%

Very consistent (91%)

Very precise: only 0.1 blunders/game

Dominates 1.c4 ♚ (71% in 24 games)

Vulnerable to 1.e4 ♔ (only 0%)

Deep Analysis

Stockfish 18 · Classical games · 191 analyzed

Accuracy by phase

Opening96.7%

Middlegame94.3%

Endgame95.8%

Clutch Factor

Performance under pressure

+6%

Winning (+2 or more)95%

94 Games

Equal position96%

60 Games

Losing (-2 or more)90%

37 Games

Problematic Pieces

Which pieces cause most errors?

♖

27%

40 errors

♙

18%

26 errors

♕

18%

26 errors

♔

16%

24 errors

♞

12%

18 errors

♗

8%

12 errors

Critical Moment

When does the first serious error occur?

Move 56average

1-15

16-25

26-35

36-45

46+

64% of blunders occur between move 46+. Keep tension until that moment.

Error Heatmap

Where do most errors occur?

4

5

5

5

6

7

7

4

8

5

abcdefgh

Many

Few

Critical squares

c38 err

d57 err

e57 err

f66 err

d75 err

c3/d5 concentrate most errors. Force decisions in those zones.

Recent Games

L

Altini, Nicola2350

Titled Tue 4th Mar Late · 4 Mar 2025

1-0

W

Priasmoro, Novendra2437

Titled Tue 4th Mar Late · 4 Mar 2025

1-0

W

Zhu, Jiner2514

Titled Tue 4th Mar Late · 4 Mar 2025

0-1

W

Mladenovic, Stefan2346

Titled Tue 4th Mar Late · 4 Mar 2025

1-0

W

Todev, Simeon2171

Titled Tue 4th Mar Late · 4 Mar 2025

1-0

L

Maghsoodloo, Parham2677

Titled Tue 4th Mar Late · 4 Mar 2025

1-0

Openings

Based on player games

Weaknesses

EXPLOIT!

White

King's Indian: Classical

42.9%

21 Games·Loses

1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5

Black

No significant weaknesses detected as Black

Strengths

AVOID

White

Queen's Gambit Declined

61.5%

39 Games·Wins

1.d4 d5 2.c4 e6

Black

French: Tarrasch

50.0%

30 Games·Wins

1.e4 e6 2.d4 d5 3.Nd2

Critical Blunders

Tactical errors analyzed with Stockfish

10 errors

▶

#60Kg6??

Endgame

vs Tari

OTB·2025

▶

#40Kg3??

Tactics

vs Sorensen

OTB·2022

▶

#50Rb4??

Endgame

vs Zhou

OTB·2022

▶

#34Kf4??

Tactics

vs Dragun

OTB·2022

▶

#35Kg1??

Tactics

vs Vanapalli

OTB·2021

▶

#40Be2??

Tactics

vs Homa

OTB·2021

▶

#30Rge8??

Tactics

vs Tian

OTB·2021

▶

#24Rc1??

Tactics

vs Niemann

OTB·2021

▶

#33Rc3??

Tactics

vs Deuer

OTB·2021

▶

#12Nbd7??

Tactics

vs Mendonca

OTB·2021

Endgame Statistics

22 endgame categories analyzed — discover where they collapse under pressure

Repertoire

☰ All

♟ Classical

⚡ Rapid

🔥 Blitz

PRO

·

2025

2024

2023

2022

2021

2020

PRO

8

7

6

5

4

3

2

1a

b

c

d

e

f

g

h

Starting Position

374 Games

45%29%26%

Move	Games	Performance	%
1.d4	315		61%
1.Nf3	30		62%
1.c4	19		55%
1.e4 Weak	10		0%

1.d4

61%

315

1.Nf3

62%

30

1.c4

55%

19

1.e4

0%

10

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