Scouting report: Sipke Ernst (GM, NED)

2,332 over-the-board games in the Chess Stalker database (2,266 classical, 24 rapid, 42 blitz): 46% wins, 32% draws, 21% losses. FIDE rating 2553 standard, 2514 rapid, 2436 blitz. 367 games analyzed with Stockfish: 93% accuracy, 0.08 blunders per game.

  • Opening repertoire of Sipke Ernst as White and Black, with results per line — free.
  • Weaknesses and blunder patterns, evaluated with Stockfish — free.
  • Recent over-the-board games and endgame statistics.
  • Twin Bot: a sparring bot that imitates Sipke Ernst's style so you can rehearse the matchup — free online.

Full report: https://chessstalker.com/fide/1004689 — no account needed.

Sipke Ernst

GM

Netherlandsborn 1979FIDE ID 1004689

Rating & statistics

FIDE rating lists · Sep 2023 – Sep 2026
2420
2460
2500
2540
2580
2550 · Sep 2023
Oct
2024
Apr
Jul
Oct
2025
Apr
Jul
Oct
2026
Apr
Jul
Oct
Sep 2023Oct 2026
2553
2514
2436
2606peak, Jan 2012
2,332games
1,080wins, 46%
757draws, 32%
495losses, 21%

Play style

before facing them
Elite accuracy: 93.2% average
Solid conversion: 91%
Very consistent (88%)
Very precise: only 0.1 blunders/game
Dominates 1.Nf3 as ♔ (73% in 263 games)

Play against Ernst's Twin

Their real openings, level & style

Based on 2,332 games

Openings

2,332 games

Weaknesses

where they slip as ♔ White

No significant weaknesses detected as white

Strengths

what holds up for them as ♔ White
Reti: Gambit1.f3 d5 2.c4 e617 games, last played 2 months ago70.6%wins
Queen's Gambit Accepted1.d4 d5 2.c4 dxc424 games, last played 2 years ago66.7%wins

Deep analysis

Stockfish · Classical · 367 analyzed
Accuracy by phase
Opening
96.3%
Middlegame
93.6%
Endgame
95.2%
Clutch factor
+5%
Winning (+2)
94%
Equal
95%
Losing (−2)
89%
Problematic pieces
23%
68 err
22%
66 err
20%
61 err
12%
36 err
12%
37 err
11%
34 err
Critical moment
Move 37 avg
10%
1-15
10%
16-25
35%
26-35
30%
36-45
15%
46+
35% of blunders occur after move 26-35. Keep tension until then.
Error heatmap · Critical squares
11
13
11
Few
Many
c4
13
d4
11
d8
11
e5
10
e7
10
c4/d4 concentrate most errors. Force decisions in those zones.

Critical blunders

10 errors
#43
a8+?? vs Bosiocic
Endgame · OTB · 2025
#41
c2+?? vs L'Ami
Endgame · OTB · 2025
#28
g6?? vs L'Ami
Endgame · OTB · 2025
#30
f5?? vs Galperin
Endgame · OTB · 2025
#67
e6?? vs Fier
Endgame · OTB · 2024
#55
d3?? vs De Winter
Endgame · OTB · 2024

Recent games

Brzezina, Piotr(2398)

27th Olomouc A GM 2026 · 23 Aug 2026

1–0
Simacek, Pavel(2372)

27th Olomouc A GM 2026 · 22 Aug 2026

½–½
Efroimski, Marsel(2360)

27th Olomouc A GM 2026 · 21 Aug 2026

1–0
Szwed, Jacek(2301)

27th Olomouc A GM 2026 · 20 Aug 2026

1–0
Delgerdalai, Bayarjavkhlan(2392)

27th Olomouc A GM 2026 · 19 Aug 2026

1–0
Mirzoev, Azer(2401)

27th Olomouc A GM 2026 · 18 Aug 2026

½–½

Endgame statistics

Repertoire

PRO
2,332 games in scope
8
7
6
5
4
3
2
1a
b
c
d
e
f
g
h
1,170 games53%W29%D18%L
Move
1. d4
7733w
52%30%18
67%
1. f3
2633w
59%27%14
73%
1. c4
5911m
53%27%20
66%
1. e4
492y
43%29%28%
57%
1. g3
146y
50%43%
71%
1. e3
523y
60%40%
80%
1. b3
59y
40%40%20
60%
1. c3
29y
100%
100%

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