GM
Deuer, Marius
GER·Born 2008·FIDE #16236432·1,089 Games
GER Classical24911,016 Games
Rapid243617 Games
Blitz251656 Games
Statistics
1089
Total
403
Wins
299
Draws
376
Losses
37%27%35%
Play Style
What you need to know before facing them
Elite accuracy: 92.9% average
Low resilience (33%): Doesn't save lost positions
Very consistent (88%)
Very precise: only 0.1 blunders/game
Dominates 1.Nf3 ♔ (64% in 36 games)
Vulnerable to 1.c4 ♚ (only 30%)
Deep Analysis
Stockfish 18 · Classical games · 453 analyzed
Accuracy by phase
Opening96.8%
Middlegame93.4%
Endgame94.9%
Clutch Factor
Performance under pressure
Winning (+2 or more)95%
161 Games
Equal position95%
169 Games
Losing (-2 or more)89%
123 Games
Problematic Pieces
Which pieces cause most errors?
♖
26%
103 errors
♙
20%
81 errors
♕
19%
76 errors
♞
13%
53 errors
♔
12%
46 errors
♗
10%
40 errors
Critical Moment
When does the first serious error occur?
Move 39average
1-15
16-25
26-35
36-45
46+
33% of blunders occur between move 26-35. Keep tension until that moment.
Error Heatmap
Where do most errors occur?
13
9
11
24
12
12
11
10
12
12
abcdefgh
Many
Few
Critical squares
e524 err
f613 err
b412 err
c212 err
f312 err
e5/f6 concentrate most errors. Force decisions in those zones.
Recent Games
D
Haring, Filip2464
Mitropa Cup 2026 · 10 May 2026
D
Moroni,L2541
Mitropa Cup 2026 · 9 May 2026
W
Rubes, Jan2375
Mitropa Cup 2026 · 8 May 2026
W
Baenziger, Fabian2434
Mitropa Cup 2026 · 7 May 2026
D
Gonda, Laszlo2464
Mitropa Cup 2026 · 6 May 2026
D
Dotzer, Lukas2488
Mitropa Cup 2026 · 5 May 2026
Openings
Based on player games
Weaknesses
EXPLOIT!White
1.b3 e5 2.Bb2 Nc6
63.6%11 Games·Loses
1.b3 e5 2.Bb2 Nc6
Black
English: Anglo-Indian
66.7%12 Games·Loses
1.c4 Nf6 2.Nc3 c5
Catalan
57.1%21 Games·Loses
1.d4 Nf6 2.c4 e6 3.g3
Strengths
AVOIDWhite
Nimzo-Indian: Capablanca
59.3%27 Games·Wins
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Bd3
Black
No consistent strengths detected as Black
Critical Blunders
Tactical errors analyzed with Stockfish
10 errors
▶
#30Nxd4??
Tactics
vs Isik
OTB·2026
▶
#69Ke5??
Endgame
vs Kaasen
OTB·2026
▶
#48Qb2+??
Endgame
vs De Boer
OTB·2025
▶
#38Bb5??
Tactics
vs Pakleza
OTB·2025
▶
#55Kh4??
Endgame
vs Bogdanov
OTB·2025
▶
#37Nd6??
Tactics
vs Alvarez Serrano
OTB·2025
▶
#47Ng6??
Endgame
vs Grischuk
Blitz·2025
▶
#16dxe6??
Tactics
vs Meier
Rapid·2025
▶
#36Re1+??
Tactics
vs Froewis
Rapid·2025
▶
#33Nf3??
Tactics
vs Subelj
Blitz·2025
Endgame Statistics
23 endgame categories analyzed — discover where they collapse under pressure
Repertoire
☰ All
♟ Classical
⚡ Rapid
🔥 Blitz
PRO2026
2025
2024
2023
2022
2021
PRO
8
76
5
4
3
2
1a
b
c
d
efgh540 Games
42%27%31%
1.d4
55%368
1.e4
55%63
1.b3
53%39
1.Nf3
64%36
1.c4
54%25
1.g3
40%5
1.b4
0%1
1.f4
100%1
1.d3
100%1
1.Nc3
0%1