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

Iotov, Valentin

BUL BUL·Born 1988·FIDE #2906074·1,530 Games

Classical24851,527 Games

Rapid—3 Games

Blitz25860 Games

Statistics

1530

Total

525

Wins

786

Draws

219

Losses

34%51%14%

Play Style

What you need to know before facing them

Elite accuracy: 96.5% average

Very consistent (95%)

Very precise: only 0.0 blunders/game

Dominates 1.c4 ♚ (65% in 36 games)

Vulnerable to 1.Nf3 ♔ (only 47%)

Deep Analysis

Stockfish 18 · Classical games · 129 analyzed

Accuracy by phase

Opening97.2%

Middlegame96.6%

Endgame97.4%

Clutch Factor

Performance under pressure

+3%

Winning (+2 or more)96%

5 Games

Equal position97%

119 Games

Losing (-2 or more)92%

5 Games

Problematic Pieces

Which pieces cause most errors?

♖

38%

5 errors

♞

31%

4 errors

♕

23%

3 errors

♔

8%

1 errors

♗

0%

0 errors

♙

0%

0 errors

Critical Moment

When does the first serious error occur?

Move 52average

1-15

16-25

26-35

36-45

46+

50% of blunders occur between move 26-35. Keep tension until that moment.

Error Heatmap

Where do most errors occur?

1

1

1

1

1

1

1

1

1

1

abcdefgh

Many

Few

Critical squares

a71 err

b41 err

b61 err

d31 err

d51 err

a7/b4 concentrate most errors. Force decisions in those zones.

Recent Games

D

Tulfer, Paul1884

Karapchanski (BUL) · 6 Mar 2022

½-½

D

Freeman, Michael Roy2531

Karapchanski (BUL) · 6 Mar 2022

½-½

D

Bokar, Jason2511

Karapchanski (BUL) · 6 Mar 2022

½-½

D

Cornejo, Wálter2522

Karapchanski (BUL) · 6 Mar 2022

½-½

D

Offringa, Tjaart2088

Karapchanski (BUL) · 6 Mar 2022

½-½

D

Schwenck, Mathias1965

EU/TC12/sf3 · 1 Aug 2021

½-½

Openings

Based on player games

Weaknesses

EXPLOIT!

White

No significant weaknesses detected as White

Black

No significant weaknesses detected as Black

Strengths

AVOID

White

King's Indian: Classical

71.4%

21 Games·Wins

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

King's Indian: Main Line

68.8%

32 Games·Wins

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

Black

Sicilian: e6 Systems

46.2%

145 Games·Wins

1.e4 c5 2.Nf3 e6

Critical Blunders

Tactical errors analyzed with Stockfish

3 errors

▶

#73Rg8??

Endgame

vs Wang

OTB·2019

▶

#50Re7??

Endgame

vs Sinha

OTB·2019

▶

#30Ng3??

Tactics

vs Steingrimsson

OTB·2019

Endgame Statistics

17 endgame categories analyzed — discover where they collapse under pressure

Repertoire

☰ All

♟ Classical

⚡ Rapid

🔥 Blitz

PRO

·

2022

2021

2020

2019

2018

2017

PRO

8

7

6

5

4

3

2

1a

b

c

d

e

f

g

h

Starting Position

775 Games

39%49%12%

Move	Games	Performance	%
1.d4	566		65%
1.e4	161		62%
1.c4	33		61%
1.Nf3	15		47%

1.d4

65%

566

1.e4

62%

161

1.c4

61%

33

1.Nf3

47%

15

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