Chessence Masters Tournament No. 12

Open SwissStandard

10 players participated in this 5-round tournament, held from 05 Dec 2025 to 07 Dec 2025 in Willingen, Germany. 1 titled players from 3 federations. Top 10 Elo average was 1761, and top seed was Anastasia Voigt (🇩🇪 GER, WFM, 2061).

Mark Mueller (🇩🇪 GER, 2004) won with 4.0/5, ahead of Peter Schnatterbeck (3.5) and Karel Dusbaba (3.5). Mueller won solo starting round 2.

The biggest upset came in round 1: Othmar Zenker (1947) beat Anastasia Voigt (WFM, 2061), a +114-point gap.

Location

🇩🇪Willingen, Germany

Dates

05 Dec 2025 → 07 Dec 2025

Time control

Standard: 90 minutes for first 40 moves and 15 min. for the rest of the game with 30 sec. increment from move 1

System

Swiss · 5 rounds

Top seed

🇩🇪WFMAnastasia Voigt2061

Avg top 10

1,761

Participants

Titled players · 1

WFM×1

Federations · 3 represented

🇩🇪Germany×8

🇨🇿Czech Republic×1

🇬🇧England×1

Top 3

🥇
Mark Mueller
🇩🇪GER·2004
4.0pts·2755perf+26.0
🥈
Peter Schnatterbeck
🇬🇧ENG
3.5pts·1995perf0.0
🥉
Karel Dusbaba
🇨🇿CZE·1960
3.5pts·2275perf+27.8

How it unfolded

Top 6 · 5 rounds

Mark Mueller led from R2; +0.5-point edge over the runner-up.

Co-leaders

Mueller4Schnatterbeck3.5Dusbaba3.5Montag2.5Kehrel2Zenker2

R2–R5 · LEAD HELD

Mark Mueller held the sole lead from R2 through R5 without losing it.

R3 · HEAD-TO-HEAD · WINNER VS 2ND

Mark Mueller beat Peter Schnatterbeck (Black).

WIN STREAKS · 2 top finishers

Mark Mueller 4 wins (R1–R4)Karel Dusbaba 3 wins (R2–R4)

Key matchups · top 4

Head-to-head between the four finishers

Player	1	2	3	4
1Mark Mueller	*	1	—	1
2Peter Schnatterbeck	0	*	1	½
3Karel Dusbaba	—	0	*	½
4Ralf Montag	0	½	½	*

Grille américaine

#	Player	Elo	Fed	R1	R2	R3	R4	R5	Pts	Bu C1	Bu	SB	Perf	Δ
1	Mueller, Mark	2004	GER	+8N	+5B	+2N	+4B	F	4.0	9.0	9.0	9.00	2755	+26.0
2	Schnatterbeck, Peter	0	ENG	+3N	=4N	−1B	+6B	+9N	3.5	12.0	13.0	7.75	1995	0.0
3	Dusbaba, Karel	1960	CZE	−2B	+7N	+5N	+8B	=4N	3.5	10.0	11.0	6.25	2275	+27.8
4	Montag, Ralf	1989	GER	+9N	=2B	=6N	−1N	=3B	2.5	13.0	14.0	5.50	1947	-4.4
5	Zenker, Othmar	1947	GER	+10N	−1N	−3B	=7B	=6N	2.0	11.5	12.0	2.50	1912	-4.8
6	Kehrel, Eike	2003	GER	=7B	=10N	=4B	−2N	=5B	2.0	10.0	10.5	3.50	1972	-3.4
7	Philipp, Nils	1892	GER	=6N	−3B	=9B	=5N	=8N	2.0	8.5	9.5	3.00	1860	-4.6
8	Tornow, Michael	1929	GER	−1B	=9N	F	−3N	=7B	1.0	10.5	11.0	1.50	1726	-21.2
9	Maucher, Richard	1822	GER	−4B	=8B	=7N	F	−2B	1.0	9.0	9.0	1.50	1812	-1.2
10	Voigt, AnastasiaWFM	2061	GER	−5B	=6B	F	F	F	0.5	5.0	5.0	1.00	1782	-29.6

Key insights

Biggest movers and upsets — the story behind the numbers.

Top rating gainers

1Dusbaba, KarelCZE
+27.8
3.5 pts · #2
2Mueller, MarkGER
+26.0
4.0 pts · #3
3Schnatterbeck, PeterENG
0.0
3.5 pts · #1

Top rating losers

1Voigt, AnastasiaWFMGER
-29.6
0.5 pts · #10
2Tornow, MichaelGER
-21.2
1.0 pts · #8
3Zenker, OthmarGER
-4.8
2.0 pts · #5

Biggest upsets

R1+114 Elo gap
Zenker, Othmar1947 beat WFMVoigt, Anastasia2061