Hammer, Jon Ludvig

NOR NOR·Born 1990·FIDE #1503707·1,999 Games

FIDE OTB · #1503707 · 1,999 Games

Classical25731,850 g Games

Rapid263754 g Games

Blitz254095 g Games

Play against Hammer's Twin

PRO

Uses their openings, level & style

Practice against a bot that uses their real openings and playing style

Ready to play

1999 games analyzed

Statistics

Total

1999

Wins

914

Draws

694

Losses

391

46%35%20%

Play Style

before facing themWhat you need to know before facing them

Elite accuracy: 94.0% average

Solid conversion: 88%

Very consistent (91%)

Very precise: only 0.1 blunders/game

Dominates 1.c4 ♔ (70% in 103 games)

Deep Analysis

Stockfish 18 · Classical games · 311 analyzed

Accuracy by phase

Opening

96.5%

Middlegame

93.9%

Endgame

95.6%

Clutch Factor

+6%

Winning (+2)Winning (+2)

95%125g

EqualEqual position

96%112g

Losing (−2)Losing (−2)

89%74g

Accuracy under pressure

Problematic Pieces — which cause most errors?

28%

55 err

19%

37 err

14%

27 err

14%

28 err

13%

25 err

13%

26 err

Critical Moment

Move 43 avg

1-15

16-25

23%

26-35

46%

36-45

31%

46+

46% of blunders after move 36-45 — keep the tension until then.of blunders occur in moves 36-45. Keep the tension until that moment.

Error Heatmap — where do errors occur?

Few

Many

Errors mapped

Hotspot zone

f5 / c1

Critical squares

11 err

8 err

7 err

6 err

f5/c1 account for most of the errors. Force decisions in those zones.

Openings

1,999 GamesBased on 1,999 player games

Weaknesses

— exploit these— exploit these lines

aswhite47.8%Losses

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

23 Games · last played 2 years agoPlay this line

asblack70.0%Losses

Petroff: Classical — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4

10 Games · last played 7 years agoPlay this line

Strengths

— avoid these— avoid these lines

aswhite71.4%Wins

Slav: Semi-Slav — 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc321 Games · last played 4 years ago

21 Games · last played 4 years ago

aswhite71.4%Wins

Caro-Kann: Advance — 1.e4 c6 2.d4 d5 3.e514 Games · last played 7 months ago

14 Games · last played 7 months ago

asblack66.7%Wins

Ruy Lopez: Closed — 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be715 Games · last played 7 months ago

15 Games · last played 7 months ago

asblack64.3%Wins

Nimzo-Indian: Classical — 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc228 Games

28 Games

Critical Blunders

10 errors · Stockfish

#30Qe6??Tacticsvs MakkarOTB · 2026

#70Bb2??Endgamevs GohOTB · 2026

#30Qe3??Tacticsvs Hillarp PerssonOTB · 2025

#48Kf3??Endgamevs CarlssonOTB · 2025

#55Nc8??Endgamevs MuradliOTB · 2025

#46Rb4+??Endgamevs AmarOTB · 2025

#39Qd7??Tacticsvs TariOTB · 2025

#33Bxd6??Tacticsvs KistrupOTB · 2024

#28h6??Tacticsvs Vestby-EllingsenOTB · 2024

#80Bc2??Endgamevs AmarRapid · 2024

Recent Games

1,999 Games

Draw

Kvaloy, Aksel Bu(2483)

ch-NOR 2026 · 11 Jul 2026

½-½

Draw

Haug, Havard(2432)

ch-NOR 2026 · 10 Jul 2026

½-½

Loss

Amar, Elham(2581)

ch-NOR 2026 · 9 Jul 2026

1-0

Win

Urkedal, Frode Olav Olsen(2567)

ch-NOR 2026 · 8 Jul 2026

0-1

Win

Ingebretsen, Jens E(2433)

ch-NOR 2026 · 7 Jul 2026

1-0

Draw

Lie, Kjetil A.(2459)

ch-NOR 2026 · 6 Jul 2026

½-½

Endgame Statistics

PRO219 endgames (58.2%)

Strongest

83%

Queen vs Queen

Weakest

20%

Double Rook

Reaches Endgame

58.2%

219 / 376

B vs N Pref

42.9% · 42.9%

7 / 7

PiecesTypeWin %Games

Rook + Minor

34.3%108

Rook+Bishop vs Rook+Knight

40.4%57

Rook + Equal Minors

28.8%52

Rook vs Rook

30.8%52

Queen vs Pieces

44.9%49

Rook vs Minor (Exchange)

38.9%36

Rook + Minor34.3%108

Rook+Bishop vs Rook+Knight40.4%57

Rook + Equal Minors28.8%52

Rook vs Rook30.8%52

Queen vs Pieces44.9%49

Rook vs Minor (Exchange)38.9%36

Weakest: Double Rook 20%Show all 23 types

Unlock Endgame Statistics

23 endgame categories analyzed — discover where they collapse under pressure

Repertoire

Move arrowsmost-played moves

Starting Position

Stockfish

1024 Games

52%32%16%

Move	Games	%
1.e4	416	66%
1.d4	372	69%
1.Nf3	121	70%
1.c4	103	70%
1.g3	12	54%

MoveGamesPerformance%

1.e4

416

66%

1.d4

372

69%

1.Nf3

121

70%

1.c4

103

70%

1.g3

54%