GM

Mareco, Sandro

ARG ARG·Born 1987·FIDE #112275·2,265 Games

Classical25462,162 Games
Rapid256639 Games
Blitz254764 Games

Statistics

2265

Total

1160

Wins

789

Draws

315

Losses

51%35%14%

Play Style

What you need to know before facing them

Elite accuracy: 93.7% average
High resilience (70%): Dangerous even when losing
Solid conversion: 84%
Very consistent (88%)
Very precise: only 0.1 blunders/game
Dominates 1.Nf3 ♔ (75% in 253 games)

Deep Analysis

Stockfish 18 · Classical games · 465 analyzed

Accuracy by phase
Opening96.9%
Middlegame94.0%
Endgame95.0%

Clutch Factor

Performance under pressure

+7%
Winning (+2 or more)95%
225 Games
Equal position94%
188 Games
Losing (-2 or more)87%
52 Games

Problematic Pieces

Which pieces cause most errors?

♖
25%
72 errors
♗
18%
52 errors
♕
16%
47 errors
♞
15%
44 errors
♙
15%
43 errors
♔
9%
27 errors

Critical Moment

When does the first serious error occur?

Move 39average
1-15
16-25
26-35
36-45
46+
35% of blunders occur between move 26-35. Keep tension until that moment.

Error Heatmap

Where do most errors occur?

10
10
8
8
14
11
7
11
9
7
abcdefgh
Many
Few
Critical squares
c514 err
d411 err
d511 err
d610 err
e610 err
c5/d4 concentrate most errors. Force decisions in those zones.

Recent Games

D
Tari, Aryan2636

Magistral Szmetan-Giardel... · 16 Dec 2025

½-½
W
Slipak, Sergio2374

Magistral Szmetan-Giardel... · 15 Dec 2025

0-1
D
Shirov, Alexei2610

Magistral Szmetan-Giardel... · 14 Dec 2025

½-½
D
Shirov, Alexei2579

Round 10: Shirov, Alexei ... · 13 Dec 2025

½-½
D
Oro, Faustino2503

Magistral Szmetan-Giardel... · 13 Dec 2025

½-½
W
Granda Zuniga, Julio E2624

Round 9: Mareco, Sandro -... · 13 Dec 2025

1-0

Openings

Based on player games

Weaknesses

EXPLOIT!
White

No significant weaknesses detected as White

Black
English vs 1...e5
55.6%
9 GamesLow sample·Loses

1.c4 e5 2.e3 Nf6

Strengths

AVOID
White
King's Indian: Classical
80.0%
15 Games·Wins

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

Reti vs King's Indian
78.6%
28 Games·Wins

1.Nf3 Nf6 2.c4 g6

Black
Sicilian: d6 Systems
46.2%
145 Games·Wins

1.e4 c5 2.Nf3 d6

Catalan
58.3%
12 Games·Wins

1.d4 Nf6 2.c4 e6 3.g3

Critical Blunders

Tactical errors analyzed with Stockfish

10 errors
▶
#29Qf1??
Tactics
vs Tari
Blitz·2025
▶
#47Rb2??
Endgame
vs Benedetti
Blitz·2025
▶
#55a2??
Endgame
vs Silva
Blitz·2025
▶
#26f4??
Tactics
vs Schnaider
OTB·2025
▶
#31Bd3??
Tactics
vs Flores
OTB·2025
▶
#95Re5??
Endgame
vs Oro
OTB·2025
▶
#38Bxc6??
Tactics
vs Oro
OTB·2025
▶
#43Bf6??
Endgame
vs Hoffman
OTB·2025
▶
#15Qd6??
Tactics
vs Cubas
OTB·2025
▶
#43Bf6??
Endgame
vs Hoffman
OTB·2025
Endgame Statistics

23 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
1137 Games
56%32%12%
1.d4
71%
495
1.e4
73%
257
1.Nf3
76%
253
1.c4
69%
129
1.b3
100%
3
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