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

Martinez Alcantara, Jose Eduardo

MEX MEX·Born 1999·FIDE #3805662·6,940 Games

Classical26506,259 Games

Rapid2636321 Games

Blitz2663381 Games

Statistics

6940

Total

4308

Wins

1274

Draws

1355

Losses

62%18%20%

Play Style

What you need to know before facing them

Elite accuracy: 92.5% average

High resilience (66%): Dangerous even when losing

Solid conversion: 90%

Very consistent (85%)

Very precise: only 0.2 blunders/game

Dominates 1.a3 ♚ (95% in 11 games)

Deep Analysis

Stockfish 18 · Classical games · 771 analyzed

Accuracy by phase

Opening96.1%

Middlegame92.9%

Endgame94.3%

Clutch Factor

Performance under pressure

+6%

Winning (+2 or more)93%

256 Games

Equal position95%

166 Games

Losing (-2 or more)88%

78 Games

Problematic Pieces

Which pieces cause most errors?

♖

26%

142 errors

♕

19%

103 errors

♞

16%

85 errors

♔

14%

74 errors

♙

14%

76 errors

♗

11%

57 errors

Critical Moment

When does the first serious error occur?

Move 46average

1-15

16-25

26-35

36-45

46+

48% of blunders occur between move 46+. Keep tension until that moment.

Error Heatmap

Where do most errors occur?

14

13

19

16

13

17

14

22

15

17

abcdefgh

Many

Few

Critical squares

d322 err

f619 err

e417 err

f317 err

f516 err

d3/f6 concentrate most errors. Force decisions in those zones.

Recent Games

W

Perez Candelario, Manuel2541

38th Dos Hermanas Active · 30 May 2026

0-1

W

Almeida Quintana, Omar2454

38th Dos Hermanas Active · 30 May 2026

1-0

D

Anton Guijarro, David2657

38th Dos Hermanas Active · 30 May 2026

½-½

W

Martinez Ramirez, Lennis2395

38th Dos Hermanas Active · 30 May 2026

1-0

W

Jimenez Mora,Guillermo1970

38th Dos Hermanas Active · 30 May 2026

0-1

W

Gutierrez Jimenez, Juan Manuel2302

38th Dos Hermanas Active · 30 May 2026

1-0

Openings

Based on player games

Weaknesses

EXPLOIT!

White

Sicilian: Alapin

45.5%

11 Games·Loses

1.e4 c5 2.c3 Nf6

Caro-Kann: Main Line

45.5%

11 Games·Loses

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

Black

Sicilian: Rossolimo

55.6%

9 GamesLow sample·Loses

1.e4 c5 2.Nf3 Nc6 3.Bb5

Strengths

AVOID

White

Sicilian: d6 Systems

72.4%

410 Games·Wins

1.e4 c5 2.Nf3 d6

French: Rubinstein

93.3%

15 Games·Wins

1.e4 e6 2.d4 d5 3.Nc3 dxe4

Black

Sicilian: d6 Systems

63.8%

799 Games·Wins

1.e4 c5 2.Nf3 d6

Scotch Game

80.0%

15 Games·Wins

1.e4 e5 2.Nf3 Nc6 3.d4

Critical Blunders

Tactical errors analyzed with Stockfish

10 errors

▶

#85Kh1??

Endgame

vs Materia

OTB·2026

▶

#23Nd2??

Tactics

vs Bluebaum

OTB·2026

▶

#32Qh4??

Tactics

vs Xiong

OTB·2026

▶

#37Ne7??

Tactics

vs Caruana

OTB·2026

▶

#32Nh5??

Tactics

vs Lai

OTB·2026

▶

#74Nxh4??

Endgame

vs Deac

OTB·2026

▶

#81Kb8??

Endgame

vs Putnam

OTB·2026

▶

#97Bf3??

Endgame

vs Ambartsumian

OTB·2026

▶

#48Kf7??

Endgame

vs Terry

OTB·2026

▶

#9Qb3??

Tactics

vs Nakamura

OTB·2026

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

3504 Games

67%17%16%

Move	Games	Performance	%
1.e4 Strong	2676		75%
1.c4 Strong	520		75%
1.b3 Strong	179		75%
1.Nf3 Strong	88		77%
1.a3 Strong	16		94%
1.d4 Strong	12		71%
1.a4 Strong	10		80%
1.e3 Weak	1		0%
1.d3 Strong	1		100%
1.b4 Weak	1		0%

1.e4

75%

2676

1.c4

75%

520

1.b3

75%

179

1.Nf3

77%

88

1.a3

94%

16

1.d4

71%

12

1.a4

80%

10

1.e3

0%

1

1.d3

100%

1

1.b4

0%

1

🍪 Cookies · Chess Stalker uses technical cookies (required for operation) and analytical cookies (to improve the service). Analytical cookies are optional.