GM

Ovsejevitsch, Sergei

UKR UKR·Born 1977·FIDE #14101866·1,140 Games

Classical25641,133 Games
Rapid24877 Games
Blitz24390 Games

Statistics

1140

Total

532

Wins

509

Draws

99

Losses

47%45%9%

Play Style

What you need to know before facing them

Elite accuracy: 94.6% average
High resilience (60%): Dangerous even when losing
Solid conversion: 90%
Very consistent (92%)
Very precise: only 0.0 blunders/game
Dominates 1.c4 ♔ (78% in 20 games)

Deep Analysis

Stockfish 18 · Classical games · 136 analyzed

Accuracy by phase
Opening96.3%
Middlegame94.4%
Endgame96.4%

Clutch Factor

Performance under pressure

+6%
Winning (+2 or more)95%
63 Games
Equal position96%
57 Games
Losing (-2 or more)89%
16 Games

Problematic Pieces

Which pieces cause most errors?

♖
26%
19 errors
♗
18%
13 errors
♞
18%
13 errors
♔
16%
12 errors
♙
14%
10 errors
♕
9%
7 errors

Critical Moment

When does the first serious error occur?

Move 42average
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?

2
3
4
3
3
3
2
4
3
4
abcdefgh
Many
Few
Critical squares
d54 err
f14 err
f34 err
a43 err
d73 err
d5/f1 concentrate most errors. Force decisions in those zones.

Recent Games

W
Baum, Jonasz2479

Chess Week Przeworsk GM · 28 May 2025

0-1
D
Petrovskiy, Vadym2437

Chess Week in Przeworsk 2... · 27 May 2025

½-½
W
Vantika Agrawal2377

Chess Week in Przeworsk 2... · 26 May 2025

1-0
D
Chatalbashev, Boris2502

Chess Week in Przeworsk 2... · 26 May 2025

½-½
W
Sowinski, Pawel2435

Chess Week in Przeworsk 2... · 25 May 2025

1-0
L
Lewtak, Damian2352

Chess Week in Przeworsk 2... · 24 May 2025

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
King's Indian: Classical
82.4%
17 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
75.0%
20 Games·Wins

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

Black
Sicilian: Classical
52.2%
23 Games·Wins

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6

Ruy Lopez: Marshall
50.0%
16 Games·Wins

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O b5

Critical Blunders

Tactical errors analyzed with Stockfish

10 errors
▶
#107hxg5??
Endgame
vs Vantika Agrawal
OTB·2025
▶
#28a4??
Tactics
vs Szustakowski
OTB·2025
▶
#28Nc7??
Tactics
vs Korley
OTB·2022
▶
#42Kd3??
Endgame
vs Pedersen
OTB·2022
▶
#30h6??
Tactics
vs Dziuba
OTB·2021
▶
#33Qa6+??
Tactics
vs Baum
OTB·2021
▶
#21Rae8??
Tactics
vs Grabarczyk
Rapid·2020
▶
#22h6??
Tactics
vs Budrewicz
Rapid·2020
▶
#49Rf1??
Endgame
vs Klimkowski
Rapid·2020
▶
#52Nxb2??
Endgame
vs Parvanyan
OTB·2020
Endgame Statistics

22 endgame categories analyzed — discover where they collapse under pressure

Repertoire
☰ All
♟ Classical
⚡ Rapid
🔥 Blitz
PRO
·
2025
2023
2022
2021
2020
2019
PRO
8
7
6
5
4
3
2
1a
b
c
d
e
f
g
h
Starting Position
593 Games
57%37%6%
1.d4
77%
437
1.Nf3
70%
122
1.c4
78%
20
1.e4
75%
14
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