H
GM
Heimann, Mark
USA·Born 1993·FIDE #2028441·355 Games
FIDE OTB · #2028441 · 355 Games
Classical2487327 g Games
Rapid24285 g Games
Blitz242123 g Games
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355 games analyzed
Statistics
Total
355Wins
175Draws
102Losses
7749%29%22%
Play Style
before facing themWhat you need to know before facing themElite 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 analyzedAccuracy by phase
Opening
96.7%
Middlegame
94.1%
Endgame
95.5%
Clutch Factor
+3%Winning (+2)Winning (+2)
93%31g
EqualEqual position
94%16g
Losing (−2)Losing (−2)
90%9g
Accuracy under pressure
Problematic Pieces — which cause most errors?
26%
12 err
23%
11 err
19%
9 err
13%
6 err
11%
5 err
9%
4 err
Critical Moment
Move 41 avg0%
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.of blunders occur in moves 26-35. Keep the tension until that moment.
Error Heatmap — where do errors occur?
4
FewMany
Errors mapped
22
Hotspot zone
f4 / b5
Critical squares
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 GamesBased on 355 player gamesWeaknesses
— exploit these— exploit these linesNo significant weaknesses detected as white
No significant weaknesses detected as black
Strengths
— avoid these— avoid these linesaswhite69.2%Wins
Sicilian: e6 Systems — 1.e4 c5 2.Nf3 e613 Games · last played 5 months ago
13 Games · last played 5 months ago
asblack46.2%Wins
Ruy Lopez: Morphy — 1.e4 e5 2.Nf3 Nc6 3.Bb5 a613 Games · last played 12 months ago
13 Games · last played 12 months ago
Critical Blunders
10 errors · Stockfish#30Rb6??vs NanugondaOTB · 2026
#56g4??vs JacobsonOTB · 2025
#52Nh7??vs BurkeOTB · 2024
#39Rf1??vs CaruanaOTB · 2024
#17Nfd2??vs ArutlaOTB · 2024
#20f4??vs GuoOTB · 2024
#34Bxb2??vs Valle LuisOTB · 2024
#36h3??vs StearmanOTB · 2024
#31Qb4??vs IinumaOTB · 2024
#42Kh7??vs SuarezOTB · 2024
Recent Games
355 GamesL
Sevian, Samuel(2701)
Naroditsky Mem Blitz 2026 · 4 Jul 2026
L
Gelfand, Boris(2641)
Naroditsky Mem Blitz 2026 · 4 Jul 2026
D
Sindarov, Javokhir(2777)
Naroditsky Mem Blitz 2026 · 4 Jul 2026
W
Hess, Robert(2591)
Naroditsky Mem Blitz 2026 · 4 Jul 2026
D
Tang, Andrew(2551)
Naroditsky Mem Blitz 2026 · 4 Jul 2026
L
Sevian, Samuel(2701)
Naroditsky Mem Rapid 2026 · 3 Jul 2026
Endgame Statistics
PRO22 endgames (39.3%)Unlock Endgame Statistics
18 endgame categories analyzed — discover where they collapse under pressure
Repertoire
6
5
4
3
Move arrowsmost-played moves
Stockfish
177 Games
54%30%16%
MoveGamesPerformance%
1.e4Strong
8575%
1.d4
4664%
1.Nf3
2669%
1.c4
1647%
1.g3
367%
1.b4Strong
1100%
USA