O
GM
Ovsejevitsch, Sergei
UKR·Born 1977·FIDE #14101866·1,140 Games
UKRFIDE OTB · #14101866 · 1,140 Games
Classical25641,133 g Games
Rapid24877 g Games
Blitz24390 g Games
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1140 games analyzed
Statistics
Total
1140Wins
532Draws
509Losses
9947%45%9%
Play Style
before facing themWhat you need to know before facing themElite 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 analyzedAccuracy by phase
Opening
96.3%
Middlegame
94.4%
Endgame
96.4%
Clutch Factor
+6%Winning (+2)Winning (+2)
95%63g
EqualEqual position
96%57g
Losing (−2)Losing (−2)
89%16g
Accuracy under pressure
Problematic Pieces — which cause most errors?
26%
19 err
18%
13 err
18%
13 err
16%
12 err
14%
10 err
9%
7 err
Critical Moment
Move 42 avg0%
1-15
0%
16-25
50%
26-35
0%
36-45
50%
46+
50% of blunders after move 26-35 — keep the tension until then.of blunders occur in moves 26-35. Keep the tension until that moment.
Error Heatmap — where do errors occur?
4
4
4
FewMany
Errors mapped
31
Hotspot zone
d5 / f1
Critical squares
d5
4 err
f1
4 err
f3
4 err
a4
3 err
d7
3 err
d5/f1 account for most of the errors. Force decisions in those zones.
Openings
1,140 GamesBased on 1,140 player gamesWeaknesses
— exploit these— exploit these linesNo significant weaknesses detected as white
No significant weaknesses detected as black
Strengths
— avoid these— avoid these linesaswhite82.4%Wins
King's Indian: Classical — 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e517 Games · last played 6 years ago
17 Games · last played 6 years ago
aswhite75.0%Wins
King's Indian: Main Line — 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O20 Games · last played 6 years ago
20 Games · last played 6 years ago
asblack52.2%Wins
Sicilian: Classical — 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc623 Games · last played 6 years ago
23 Games · last played 6 years ago
asblack50.0%Wins
Ruy Lopez: Marshall — 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O b516 Games · last played 14 years ago
16 Games · last played 14 years ago
Critical Blunders
10 errors · Stockfish#107hxg5??vs Vantika AgrawalOTB · 2025
#28a4??vs SzustakowskiOTB · 2025
#28Nc7??vs KorleyOTB · 2022
#42Kd3??vs PedersenOTB · 2022
#30h6??vs DziubaOTB · 2021
#33Qa6+??vs BaumOTB · 2021
#21Rae8??vs GrabarczykRapid · 2020
#22h6??vs BudrewiczRapid · 2020
#49Rf1??vs KlimkowskiRapid · 2020
#52Nxb2??vs ParvanyanOTB · 2020
Recent Games
1,140 GamesWin
Baum, Jonasz(2479)
Chess Week Przeworsk GM · 28 May 2025
Draw
Petrovskiy, Vadym(2437)
Chess Week in Przeworsk 2... · 27 May 2025
Win
Vantika Agrawal(2377)
Chess Week in Przeworsk 2... · 26 May 2025
Draw
Chatalbashev, Boris(2502)
Chess Week in Przeworsk 2... · 26 May 2025
Win
Sowinski, Pawel(2435)
Chess Week in Przeworsk 2... · 25 May 2025
Loss
Lewtak, Damian(2352)
Chess Week in Przeworsk 2... · 24 May 2025
Endgame Statistics
PRO84 endgames (59.6%)Unlock Endgame Statistics
22 endgame categories analyzed — discover where they collapse under pressure
Repertoire
8
76
5
4
3
2
1a
b
c
d
efghMove arrowsmost-played moves
Stockfish
593 Games
57%37%6%
MoveGamesPerformance%
1.d4Strong
43777%
1.Nf3Strong
12270%
1.c4Strong
2078%
1.e4Strong
1475%