E
GM
Ernst, Sipke
NED·Born 1979·FIDE #1004689·2,516 Games
NEDFIDE OTB · #1004689 · 2,516 Games
Classical25422,441 g Games
Rapid251425 g Games
Blitz243650 g Games
Play against Ernst's Twin
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Ready to play
2516 games analyzed
Statistics
Total
2516Wins
1157Draws
826Losses
53246%33%21%
Play Style
before facing themWhat you need to know before facing themElite accuracy: 93.2% average
Solid conversion: 90%
Very consistent (88%)
Very precise: only 0.1 blunders/game
Dominates 1.Nf3 ♔ (72% in 284 games)
Deep Analysis
Stockfish 18 · Classical games · 367 analyzedAccuracy by phase
Opening
96.3%
Middlegame
93.6%
Endgame
95.2%
Clutch Factor
+5%Winning (+2)Winning (+2)
94%157g
EqualEqual position
95%127g
Losing (−2)Losing (−2)
89%83g
Accuracy under pressure
Problematic Pieces — which cause most errors?
23%
68 err
22%
66 err
20%
61 err
12%
36 err
12%
37 err
11%
34 err
Critical Moment
Move 37 avg10%
1-15
10%
16-25
35%
26-35
30%
36-45
15%
46+
35% 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?
11
13
11
FewMany
Errors mapped
98
Hotspot zone
c4 / d4
Critical squares
c4
13 err
d4
11 err
d8
11 err
e5
10 err
e7
10 err
c4/d4 account for most of the errors. Force decisions in those zones.
Openings
2,516 GamesBased on 2,516 player gamesWeaknesses
— exploit these— exploit these linesNo significant weaknesses detected as white
asblack66.7%Losses
Nimzo-Indian: Classical — 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2
9 Games · Low sample · last played 8 years agoPlay this line
Strengths
— avoid these— avoid these linesaswhite70.6%Wins
Reti: Gambit — 1.Nf3 d5 2.c4 e617 Games · last played 4 weeks ago
17 Games · last played 4 weeks ago
aswhite66.7%Wins
Reti vs King's Indian — 1.Nf3 Nf6 2.c4 g633 Games · last played 6 years ago
33 Games · last played 6 years ago
asblack76.9%Wins
Nimzo-Indian: Rubinstein — 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e313 Games · last played 2 years ago
13 Games · last played 2 years ago
asblack66.7%Wins
Ruy Lopez: Steinitz Deferred — 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d612 Games · last played last year
12 Games · last played last year
Critical Blunders
10 errors · Stockfish#43Ra8+??vs BosiocicOTB · 2025
#41Rc2+??vs L'AmiOTB · 2025
#28g6??vs L'AmiOTB · 2025
#30Nf5??vs GalperinOTB · 2025
#67Ke6??vs FierOTB · 2024
#55Rd3??vs De WinterOTB · 2024
#34Bf5+??vs VandenbusscheOTB · 2024
#9Qd3??vs Van DaelOTB · 2024
#12Qd7??vs BeerdsenOTB · 2024
#23Bg7??vs ZelbelOTB · 2024
Recent Games
2,516 GamesD
Vrolijk, Liam(2519)
ch-NED KO 2026 · 7 Jul 2026
D
Vrolijk, Liam(2519)
ch-NED KO 2026 · 7 Jul 2026
D
Vrolijk, Liam(2519)
ch-NED KO 2026 · 6 Jul 2026
W
De Winter, Arthur(2446)
ch-NED KO 2026 · 5 Jul 2026
D
De Winter, Arthur(2446)
ch-NED KO 2026 · 4 Jul 2026
D
Eljanov, Pavel(2682)
TCh-BEL 2025-26 · 19 Apr 2026
Endgame Statistics
PRO201 endgames (51.7%)Unlock Endgame Statistics
23 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
1270 Games
53%30%17%
MoveGamesPerformance%
1.d4
84467%
1.Nf3Strong
28472%
1.c4
6465%
1.e4
5157%
1.g3Strong
1471%
1.b3
658%
1.e3Strong
580%
1.Nc3Strong
2100%