GM

Ernst, Sipke

NED NED·Born 1979·FIDE #1004689·2,510 Games

Classical25382,435 Games
Rapid251425 Games
Blitz243650 Games

Statistics

2510

Total

1156

Wins

821

Draws

532

Losses

46%33%21%

Play Style

What you need to know before facing them

Elite accuracy: 93.2% average
Solid conversion: 90%
Very consistent (88%)
Very precise: only 0.1 blunders/game
Dominates 1.Nf3 ♔ (72% in 282 games)

Deep Analysis

Stockfish 18 · Classical games · 361 analyzed

Accuracy by phase
Opening96.3%
Middlegame93.6%
Endgame95.3%

Clutch Factor

Performance under pressure

+5%
Winning (+2 or more)94%
156 Games
Equal position95%
126 Games
Losing (-2 or more)89%
79 Games

Problematic Pieces

Which pieces cause most errors?

♙
23%
67 errors
♖
21%
62 errors
♕
20%
60 errors
♗
12%
36 errors
♔
12%
36 errors
♞
11%
33 errors

Critical Moment

When does the first serious error occur?

Move 37average
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?

11
9
10
10
8
8
11
11
9
8
abcdefgh
Many
Few
Critical squares
c411 err
d411 err
d811 err
e510 err
e710 err
c4/d4 concentrate most errors. Force decisions in those zones.

Recent Games

W
Bosman, Michiel2297

Dutch Meesterklasse 2025-... · 28 Mar 2026

0-1
D
Lombaers, Peter2309

Round 8: Ernst, Sipke - L... · 7 Mar 2026

½-½
W
Mihok, Oliver2536

2nd Bundesliga Nord 25-26 · 1 Mar 2026

0-1
D
Lutz, Christopher2512

2nd Bundesliga Nord 25-26 · 28 Feb 2026

½-½
W
Meshkovs, Nikita2554

2. Bundesliga Nord 25-26 · 8 Feb 2026

1-0
D
Fridman, Daniel2581

2. Bundesliga Nord 25-26 · 7 Feb 2026

½-½

Openings

Based on player games

Weaknesses

EXPLOIT!
White

No significant weaknesses detected as White

Black
Nimzo-Indian: Classical
66.7%
9 GamesLow sample·Loses

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2

Strengths

AVOID
White
Reti: Gambit
75.0%
16 Games·Wins

1.Nf3 d5 2.c4 e6

Reti vs King's Indian
66.7%
33 Games·Wins

1.Nf3 Nf6 2.c4 g6

Black
Nimzo-Indian: Rubinstein
76.9%
13 Games·Wins

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3

Ruy Lopez: Steinitz Deferred
66.7%
12 Games·Wins

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6

Critical Blunders

Tactical errors analyzed with Stockfish

10 errors
▶
#43Ra8+??
Endgame
vs Bosiocic
OTB·2025
▶
#41Rc2+??
Endgame
vs L'Ami
OTB·2025
▶
#28g6??
Tactics
vs L'Ami
OTB·2025
▶
#30Nf5??
Tactics
vs Galperin
OTB·2025
▶
#55Rd3??
Endgame
vs De Winter
OTB·2024
▶
#34Bf5+??
Tactics
vs Vandenbussche
OTB·2024
▶
#9Qd3??
Tactics
vs Van Dael
OTB·2024
▶
#12Qd7??
Tactics
vs Beerdsen
OTB·2024
▶
#23Bg7??
Tactics
vs Zelbel
OTB·2024
▶
#16Bxe6+??
Tactics
vs Draskovic
OTB·2023
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
1267 Games
53%30%17%
1.d4
67%
843
1.Nf3
72%
282
1.c4
65%
64
1.e4
57%
51
1.g3
71%
14
1.b3
58%
6
1.e3
80%
5
1.Nc3
100%
2
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