GM

Hammer, Jon Ludvig

NOR NOR·Born 1990·FIDE #1503707·1,990 Games

Classical25741,841 Games
Rapid263754 Games
Blitz254095 Games

Statistics

1990

Total

911

Wins

689

Draws

390

Losses

46%35%20%

Play Style

What you need to know before facing them

Elite accuracy: 94.0% average
Solid conversion: 88%
Very consistent (91%)
Very precise: only 0.0 blunders/game
Dominates 1.Nf3 ♔ (70% in 120 games)

Deep Analysis

Stockfish 18 · Classical games · 308 analyzed

Accuracy by phase
Opening96.5%
Middlegame93.9%
Endgame95.6%

Clutch Factor

Performance under pressure

+6%
Winning (+2 or more)95%
124 Games
Equal position96%
112 Games
Losing (-2 or more)89%
72 Games

Problematic Pieces

Which pieces cause most errors?

♖
28%
54 errors
♙
19%
37 errors
♞
14%
27 errors
♕
14%
28 errors
♗
13%
25 errors
♔
12%
24 errors

Critical Moment

When does the first serious error occur?

Move 44average
1-15
16-25
26-35
36-45
46+
45% of blunders occur between move 36-45. Keep tension until that moment.

Error Heatmap

Where do most errors occur?

5
7
11
6
8
5
5
6
5
8
abcdefgh
Many
Few
Critical squares
f511 err
c18 err
e48 err
b77 err
f36 err
f5/c1 concentrate most errors. Force decisions in those zones.

Recent Games

D
Johansson, Linus2417

Rond 9: Johansson, Linus ... · 8 Mar 2026

½-½
D
Pantzar, Milton2421

Swedish Team Championship... · 7 Mar 2026

½-½
D
Pantzar, Milton2435

Rond 8: Hammer, Jon Ludvi... · 7 Mar 2026

½-½
D
Berg, Emanuel2478

Rond 7: Hammer, Jon Ludvi... · 6 Mar 2026

½-½
D
Berg, Emanuel1711

Swedish Team Championship... · 6 Mar 2026

½-½
W
Ostmoe, Geir Sune Tallaksen2496

Eliteserien 2025-26 · 6 Feb 2026

1-0

Openings

Based on player games

Weaknesses

EXPLOIT!
White
Sicilian: Najdorf
47.8%
23 Games·Loses

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6

Black
Petroff: Classical
70.0%
10 Games·Loses

1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4

Strengths

AVOID
White
Slav: Semi-Slav
71.4%
21 Games·Wins

1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3

Caro-Kann: Advance
71.4%
14 Games·Wins

1.e4 c6 2.d4 d5 3.e5

Black
Ruy Lopez: Closed
66.7%
15 Games·Wins

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7

Nimzo-Indian: Classical
64.3%
28 Games·Wins

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

Critical Blunders

Tactical errors analyzed with Stockfish

10 errors
▶
#30Qe6??
Tactics
vs Makkar
OTB·2026
▶
#70Bb2??
Endgame
vs Goh
OTB·2026
▶
#30Qe3??
Tactics
vs Hillarp Persson
OTB·2025
▶
#48Kf3??
Endgame
vs Carlsson
OTB·2025
▶
#55Nc8??
Endgame
vs Muradli
OTB·2025
▶
#46Rb4+??
Endgame
vs Amar
OTB·2025
▶
#39Qd7??
Tactics
vs Tari
OTB·2025
▶
#33Bxd6??
Tactics
vs Kistrup
OTB·2024
▶
#28h6??
Tactics
vs Vestby-Ellingsen
OTB·2024
▶
#80Bc2??
Endgame
vs Amar
Rapid·2024
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
1020 Games
52%32%16%
1.e4
66%
416
1.d4
69%
370
1.Nf3
70%
120
1.c4
70%
102
1.g3
54%
12
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