1. Muenster Oster Open - A

SwissStandard

72 players participated in this 9-round tournament, held from 27 Mar 2026 to 31 Mar 2026 in Muenster, Germany. 19 titled players from 8 federations. Top 10 Elo average was 2352, and top seed was Ruben Gideon Koellner (🇩🇪 GER, IM, 2514).

Raja Harshit (🇮🇳 IND, GM, 2472) won with 7.0/9, ahead of Nico Stelmaszyk (6.5) and Hagen Poetsch (6.5). Harshit shared the lead from round 7 and broke clear in the final round.

The biggest upset came in round 2: Felix Georg (2070) beat Bram Ten Dam (FM, 2357), a +287-point gap.

Location

🇩🇪Muenster, Germany

Dates

27 Mar 2026 → 31 Mar 2026

Time control

Standard: 90min/40moves+30min/end+30sec increment per move starting from move 1

System

Swiss · 9 rounds

Top seed

🇩🇪IMRuben Gideon Koellner2514

Avg top 10

2,352

Participants

Titled players · 19

GM×2

IM×1

FM×8

CM×8

Federations · 8 represented

🇩🇪Germany×55

🇬🇧England×3

🇮🇳India×3

🇩🇰Denmark×2

🇳🇱Netherlands×1

🇵🇾Paraguay×1

🇷🇸Serbia×1

🇬🇪Georgia×1

Top 3

🥇
GMRaja Harshit
🇮🇳IND·2472
7.0pts·2575perf+9.5
🥈
FMNico Stelmaszyk
🇩🇪GER·2355
6.5pts·2316perf-1.7
🥉
GMHagen Poetsch
🇩🇪GER·2455
6.5pts·2508perf+6.4

How it unfolded

Top 6 · 9 rounds

GM Raja Harshit led from R4; +0.5-point edge over the runner-up.

Co-leaders

Harshit7Stelmaszyk6.5Koellner6.5Poetsch6.5Akhmatovski6Strehse6

R6 · LEADER CHANGE30 Mar

FM Nico Stelmaszyk takes the sole lead (5.0/6).

R7 · HEAD-TO-HEAD · WINNER VS 2ND

GM Raja Harshit beat FM Nico Stelmaszyk (White).

WIN STREAKS · 2 top finishers

GM Raja Harshit 4 wins (R1–R4)FM Nico Stelmaszyk 4 wins (R3–R6)

Key matchups · top 4

Head-to-head between the four finishers

Player	1	2	3	4
1GMRaja Harshit	*	1	½	½
2FMNico Stelmaszyk	0	*	—	—
3IMRuben Gideon Koellner	½	—	*	½
4GMHagen Poetsch	½	—	½	*

Grille américaine

#	Player	Elo	Fed	R1	R2	R3	R4	R5	R6	R7	R8	R9	Pts	Bu C1	Bu	SB	Perf	Δ
1	Raja HarshitGM	2472	IND	+71N	+6B	+29N	+16B	F	=4N	+2B	=3N	+10B	7.0	40.5	40.5	34.00	2575	+9.5
2	Stelmaszyk, NicoFM	2355	GER	+9B	−33N	+12B	+34N	+36B	+16N	−1N	+7B	=6N	6.5	43.0	47.0	33.00	2316	-1.7
3	Poetsch, HagenGM	2455	GER	+57B	+11N	=33B	+10N	F	+7N	+18B	=1B	=4N	6.5	42.0	42.0	33.25	2508	+6.4
4	Koellner, Ruben GideonIM	2514	GER	+24B	+26N	=54B	F	+33N	=1B	+44N	+8B	=3B	6.5	39.5	39.5	31.00	2533	+3.1
5	Akhmatovski, Maxim	2125	GER	=27B	−18N	+41B	+66N	=9B	=13N	+24B	=11N	+26B	6.0	39.0	40.5	25.00	2282	+38.4
6	Vollbehr, BjarneCM	2205	GER	+65B	−1N	−16B	+52N	=45B	+38N	+39B	+26N	=2B	6.0	38.0	40.0	23.00	2260	+26.8
7	Strehse, Nelson	2238	GER	−47N	+34B	+46N	+49B	+28N	−3B	+32B	−2N	+17B	6.0	37.5	41.0	24.50	2264	+12.2
8	Chassard, CedricFM	2285	GER	−33B	+65N	=9B	+64N	+21B	=32N	+25B	−4N	+16B	6.0	37.0	39.0	23.75	2254	-5.8
9	Perske, Paul	2160	GER	−2N	+17B	=8N	+60B	=5N	+37B	=10B	=18N	=13B	5.5	43.5	46.0	25.50	2224	+16.2
10	Aynaoglu, EfeCM	2026	TUR	+70N	+24N	=26B	−3B	=14N	+27B	=9N	+44B	−1N	5.5	41.5	42.5	21.25	2296	+115.1
11	Vogel, ConstantinCM	2206	GER	+62N	−3B	+28N	+17B	−16N	=19B	+47N	=5B	=20N	5.5	40.5	43.0	23.50	2183	-5.0
12	Dupuis, Denis K	2142	ENG	=13N	=14B	−2N	=19B	+42N	+48B	+30N	+15B	F	5.5	40.0	40.0	25.50	2323	+76.8
13	Menzel, Maximilian	2240	GER	=12B	=35N	−25B	+51N	+48N	=5B	=20N	+28B	=9N	5.5	38.5	42.0	24.50	2169	-15.6
14	Gallas, Noel	2236	GER	=46B	=12N	+35B	=21N	=10B	=39N	=17B	+32N	=18B	5.5	38.0	41.5	24.75	2165	-15.4
15	Ten Dam, BramFM	2357	NED	=44N	−29B	+60N	+68B	−47N	+46B	+16B	−12N	+24B	5.5	32.5	34.0	18.75	2185	-35.2
16	Brockhoff, Moritz	1991	GER	+68N	+71B	+6N	−1N	+11B	−2B	−15N	+27B	−8N	5.0	42.5	42.5	17.50	2295	+65.0
17	Tomasjan, Samuel	1985	GER	+23B	−9N	+57B	−11N	+29N	=30B	=14N	+31B	−7N	5.0	41.0	43.5	21.50	2223	+54.4
18	Weidemann, JakobFM	2257	GER	=20N	+5B	+30N	=32B	F	+47B	−3N	=9B	=14N	5.0	40.5	40.5	24.00	2290	+6.6
19	Abheek Bhatt	1991	IND	=45B	=21N	=24B	=12N	+35B	=11N	=22B	=25N	=40B	5.0	38.0	41.5	22.75	2175	+87.2
20	Spiric, IgorFM	2142	SRB	=18B	−27N	+45B	=39N	F	+21N	=13B	+22N	=11B	5.0	38.0	38.0	23.50	2254	+23.8
21	Rott, Georg	2038	GER	=58N	=19B	+69N	=14B	−8N	−20B	=46N	+41B	+57N	5.0	34.0	35.0	15.75	2101	+12.8
22	Michalczak, ThomasFM	2220	GER	−25N	+49B	=47N	−28B	+68N	+62B	=19N	−20B	+34N	5.0	32.5	34.0	15.75	2109	-26.2
23	Dayal, Samar	2060	ENG	−17N	F	F	+70B	−24B	+66N	+58B	+50N	+44B	5.0	21.5	21.5	12.00	2175	+30.5
24	Weigand, AntonCM	2189	GER	−4N	−10B	=19N	+63B	+23N	+45B	−5N	+48B	−15N	4.5	40.5	43.0	17.00	2133	-14.8
25	Verbitsky, Jaroslaw	2086	GER	+22B	−30B	+13N	=50N	F	+31B	−8N	=19B	=27N	4.5	38.5	38.5	21.50	2221	+29.8
26	Reimer, Philip	2219	GER	+64B	−4B	=10N	F	+49N	+28B	+33N	−6B	−5N	4.5	38.5	38.5	17.25	2187	-6.6
27	Mamedov, AflatunCM	2234	UKR	=5N	+20B	−32B	+59N	=37B	−10N	+36B	−16N	=25B	4.5	38.0	40.5	18.75	2048	-42.8
28	Chekanov, Timur	2025	FID	+69B	+57N	−11B	+22N	−7B	−26N	+35B	−13N	=32B	4.5	37.0	38.0	14.50	2140	+45.6
29	Georg, Felix	2070	GER	+39B	+15N	−1B	−36N	−17B	=52N	−48N	+66B	+55N	4.5	35.5	37.0	15.75	2074	-2.4
30	Vlasov, Igor	2227	GER	+53B	+25N	−18B	=37N	F	=17N	−12B	=39N	+38B	4.5	35.5	35.5	18.50	2121	-20.8
31	Villiers, ThomasCM	2258	ENG	F	+51N	=53B	=45N	+34B	−25N	=50B	−17N	+52B	4.5	31.0	31.0	16.25	2074	-35.4
32	Meessen, Max	2081	GER	F	+44B	+27N	=18N	=54B	=8B	−7N	−14B	=28N	4.0	38.5	38.5	17.50	2221	+29.0
33	Gerlach, Felix	2144	GER	+8N	+2B	=3N	=54N	−4B	+36N	−26B	F	F	4.0	37.5	37.5	21.50	2351	+36.0
34	Aryan Goyal	2041	IND	+55B	−7N	+52B	−2B	−31N	=53N	=38B	+69N	−22B	4.0	36.0	37.0	11.25	2057	+0.4
35	Di Fonzo, ValerioCM	2091	ITA	F	=13B	−14N	+69B	−19N	+43B	−28N	=36N	+50B	4.0	33.0	33.0	13.25	2000	-18.0
36	Stadler, Andreas	1954	GER	+56B	=64N	=62N	+29B	−2N	−33B	−27N	=35B	=46N	4.0	32.5	35.0	13.75	2094	+31.0
37	Harringer, Manfred	1974	GER	+42N	+40B	−44N	=30B	=27N	−9N	=56B	=46B	F	4.0	32.5	32.5	15.75	2147	+35.4
38	Baumann, Stephan	2069	GER	=61N	−48B	−43N	+67B	+41N	−6B	=34N	+49B	−30N	4.0	32.0	33.5	12.25	1988	-19.2
39	Weber, Nikita	2010	GER	−29N	+70B	=68N	=20B	+40N	=14B	−6N	=30B	F	4.0	32.0	32.0	13.25	2122	+47.2
40	Amini, Yusuf	2150	GER	−54B	−37N	+51B	+58N	−39B	=50N	+59B	F	=19N	4.0	29.0	31.5	12.75	2037	-37.2
41	Behr, Julian	1918	GER	+72N	=62B	−5N	−47B	−38B	=51N	+67B	−21N	+59B	4.0	28.5	28.5	7.00	2012	+22.6
42	Quinones-Maletti, Julio Guillermo	2057	DEN	−37B	=43N	−66B	+71N	−12B	−58N	+70B	+59N	=48N	4.0	24.5	24.5	7.25	1965	-21.8
43	Seifert, Hendrik	1930	GER	−49N	=42B	+38B	F	F	−35N	+51B	=45N	+69B	4.0	23.5	23.5	12.25	2059	+20.8
44	Heinichen R., Juan UvaldoCM	2166	PAR	=15B	−32N	+37B	+56N	+50B	F	−4B	−10N	−23N	3.5	37.5	40.5	13.25	2086	-19.4
45	Rosskothen, Arnd	2064	GER	=19N	+61B	−20N	=31B	=6N	−24N	=52B	=43B	F	3.5	35.0	35.0	14.00	2042	-5.8
46	Mikeladze, Berdia	2136	GEO	=14N	F	−7B	=62B	+59N	−15N	=21B	=37N	=36B	3.5	35.0	35.0	13.00	2073	-14.2
47	Kummerow, HeikoFM	2137	GER	+7B	−54N	=22B	+41N	+15B	−18N	−11B	F	F	3.5	34.5	34.5	18.00	2217	+15.0
48	Berkle, Pascal	1995	GER	F	+38N	−64B	+53N	−13B	−12N	+29B	−24N	=42B	3.5	34.0	34.0	14.00	2075	+15.8
49	Mueller, Konstantin	2037	GER	+43B	−22N	+58B	−7N	−26B	=57N	=53B	−38N	=67B	3.5	32.0	33.5	10.25	2009	-16.0
50	Tupac Yupanqui Herrera, Daniel	1973	PER	+59B	−53N	+63N	=25B	−44N	=40B	=31N	−23B	−35N	3.5	31.5	34.0	11.50	2035	+13.0
51	Mukazhanov, Mansur	2036	GER	+67N	−31B	−40N	−13B	=55N	=41B	−43N	=60B	+61N	3.5	30.0	31.5	8.75	1967	-24.9
52	Hoffmann, Matthias	1964	GER	=60N	=63B	−34N	−6B	+69N	=29B	=45N	=57B	−31N	3.5	30.0	31.0	8.75	1974	+1.2
53	Niemann, Peter	2101	GER	−30N	+50B	=31N	−48B	=60N	=34B	=49N	=55B	F	3.5	29.0	29.0	12.25	2023	-17.6
54	Dathe, FrederickFM	2322	GER	+40N	+47B	=4N	=33B	=32N	F	F	F	F	3.5	25.5	25.5	14.75	2354	+5.0
55	Hoffmann, Nico	1945	GER	−34N	−68B	=70N	F	=51B	+65N	=63B	=53N	−29B	3.0	22.5	22.5	7.25	1954	+1.6
56	Mueller, Frank	2049	GER	−36N	=67B	+61N	−44B	F	+60B	=37N	F	F	3.0	22.0	22.0	7.75	2013	-6.0
57	Schwibbert, Jonas	2167	GER	−3N	−28B	−17N	F	=58B	=49B	+61N	=52N	−21B	2.5	33.0	33.0	7.25	1914	-54.0
58	Fock, Amina	1933	GER	=21B	=59N	−49N	−40B	=57N	+42B	−23N	F	F	2.5	29.0	29.0	9.00	1979	+7.2
59	Struck, Lasse	2056	GER	−50N	=58B	+67N	−27B	−46B	+70N	−40N	−42B	−41N	2.5	27.5	28.5	3.75	1858	-48.0
60	Giel, Olaf	2053	GER	=52B	+66N	−15B	−9N	=53B	−56N	−69B	=51N	F	2.5	27.0	27.0	6.75	1992	-13.4
61	Hering, Frank Andreas	2002	GER	=38B	−45N	−56B	+65N	−64B	=63N	−57B	=67N	−51B	2.5	23.5	25.0	6.00	1892	-26.2
62	Meuer, David	2075	GER	−11B	=41N	=36B	=46N	+66B	−22N	F	F	F	2.5	23.5	23.5	7.25	2014	-10.8
63	Klemenz, Luca	2063	GER	=66B	=52N	−50B	−24N	F	=61B	=55N	F	=65B	2.5	23.0	23.0	6.25	1917	-28.4
64	Schreidl, Michael	2074	GER	−26N	=36B	+48N	−8B	+61N	F	F	F	F	2.5	20.5	20.5	8.00	2091	+3.6
65	Christensen, Jan Schleicher	2070	DEN	−6N	−8B	F	−61B	+67N	−55B	F	=70N	=63N	2.0	22.5	22.5	3.25	1887	-35.0
66	Markosyan, Aleksandr	1990	GER	=63N	−60B	+42N	−5B	−62N	−23B	F	−29N	F	1.5	27.0	27.0	5.25	1842	-24.2
67	Kathstede, Gerd, Dr.	1927	GER	−51B	=56N	−59B	−38N	−65B	F	−41N	=61B	=49N	1.5	25.0	25.0	4.50	1779	-27.8
68	Pfaar, Zeno	2064	GER	−16B	+55N	=39B	−15N	−22B	F	F	F	F	1.5	22.5	22.5	5.00	1956	-15.6
69	Grauer, Joel	0	GER	−28N	F	−21B	−35N	−52B	F	+60N	−34B	−43N	1.0	27.5	27.5	2.50	1711	0.0
70	Fock, Sana	1885	GER	−10B	−39N	=55B	−23N	F	−59B	−42N	=65B	F	1.0	26.0	26.0	2.50	1723	-22.6
71	Schroeder, Lennart	2170	GER	−1B	−16N	F	−42B	F	F	F	F	F	0.0	17.0	17.0	0.00	1373	-30.6
72	Kolakovic, Klaudio	2029	GER	−41B	F	F	F	F	F	F	F	F	0.0	4.0	4.0	0.00	1118	-13.0

Key insights

Biggest movers and upsets — the story behind the numbers.

Top rating gainers

1Aynaoglu, EfeCMTUR
+115.1
5.5 pts · #12
2Abheek BhattIND
+87.2
5.0 pts · #22
3Dupuis, Denis KENG
+76.8
5.5 pts · #15

Top rating losers

1Schwibbert, JonasGER
-54.0
2.5 pts · #59
2Struck, LasseGER
-48.0
2.5 pts · #64
3Mamedov, AflatunCMUKR
-42.8
4.5 pts · #29

Biggest upsets

R2+287 Elo gap
Georg, Felix2070 beat FMTen Dam, Bram2357
R8+273 Elo gap
Tomasjan, Samuel1985 beat CMVilliers, Thomas2258
R8+243 Elo gap
Brockhoff, Moritz1991 beat CMMamedov, Aflatun2234