H
GM

Heimann, Mark

USA USA·Born 1993

FIDE OTB · #2028441 · 355 Games

Classical2487327 g
Rapid24285 g
Blitz242123 g

Play against Heimann's Twin

PRO

Uses their openings, level & style

Statistics

Total

355

Wins

175

Draws

102

Losses

77
49%29%22%

Play Style

before facing them
Elite accuracy: 93.0% average
Solid conversion: 89%
Very consistent (85%)
Very precise: only 0.1 blunders/game
Dominates 1.e4 ♔ (75% in 85 games)
Vulnerable to 1.c4 ♔ (only 47%)

Deep Analysis

Stockfish 18 · Classical games · 56 analyzed
Accuracy by phase
Opening
96.7%
Middlegame
94.1%
Endgame
95.5%
Clutch Factor
+3%
Winning (+2)
93%
Equal
94%
Losing (−2)
90%
Problematic Pieces
26%
12 err
23%
11 err
19%
9 err
13%
6 err
11%
5 err
9%
4 err
Critical Moment
Move 41 avg
0%
1-15
0%
16-25
33%
26-35
33%
36-45
33%
46+
33% of blunders after move 26-35 — keep the tension until then.
Error Heatmap
4
Few
Many
f4
4 err
b5
2 err
b7
2 err
c3
2 err
c6
2 err
f4/b5 account for most of the errors. Force decisions in those zones.

Openings

355 Games

Weaknesses

— exploit these

No significant weaknesses detected as white

No significant weaknesses detected as black

Strengths

— avoid these
aswhite69.2%Wins
Sicilian: e6 Systems — 1.e4 c5 2.Nf3 e6
13 Games · last played 5 months ago
asblack46.2%Wins
Ruy Lopez: Morphy — 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6
13 Games · last played 12 months ago

Critical Blunders

10 errors
Rb6??vs NanugondaOTB · 2026
g4??vs JacobsonOTB · 2025
Nh7??vs BurkeOTB · 2024
Rf1??vs CaruanaOTB · 2024
Nfd2??vs ArutlaOTB · 2024
f4??vs GuoOTB · 2024
Bxb2??vs Valle LuisOTB · 2024
h3??vs StearmanOTB · 2024
Qb4??vs IinumaOTB · 2024
Kh7??vs SuarezOTB · 2024

Recent Games

L
Sevian, Samuel(2701)

Naroditsky Mem Blitz 2026 · 4 Jul 2026

0-1
L
Gelfand, Boris(2641)

Naroditsky Mem Blitz 2026 · 4 Jul 2026

1-0
D
Sindarov, Javokhir(2777)

Naroditsky Mem Blitz 2026 · 4 Jul 2026

½-½
W
Hess, Robert(2591)

Naroditsky Mem Blitz 2026 · 4 Jul 2026

0-1
D
Tang, Andrew(2551)

Naroditsky Mem Blitz 2026 · 4 Jul 2026

½-½
L
Sevian, Samuel(2701)

Naroditsky Mem Rapid 2026 · 3 Jul 2026

0-1

Endgame Statistics

PRO

Repertoire

8
7
6
5
4
3
2
1a
b
c
d
e
f
g
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Move arrowsmost-played moves
Stockfish
177 Games
54%30%16%
MoveGamesPerformance%
1.e4Strong
85
75%
1.d4
46
64%
1.Nf3
26
69%
1.c4
16
47%
1.g3
3
67%
1.b4Strong
1
100%

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