Chess festival Ceske Budejovice 2025 - Open - B

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61 players participated in this 9-round tournament, held from 28 Jun 2025 to 06 Jul 2025 in Ceske Budejovice, Czech Republic. 4 federations represented. Top 10 Elo average was 1793, and top seed was Lukas Karolyi (🇨🇿 CZE, 1874).

Nathan Zeigler (🇺🇸 USA, 1785) won with 8.5/9, ahead of Ali Naghiyev (8.0) and Jachym Fadrny (7.0). Zeigler broke clear in the final round.

The biggest upset came in round 8: Adam Heral (1436) beat Vaclav Lefler (1705), a +269-point gap.

Location

🇨🇿Ceske Budejovice, Czech Republic

Dates

28 Jun 2025 → 06 Jul 2025

Time control

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

System

Swiss · 9 rounds

Top seed

🇨🇿Lukas Karolyi1874

Avg top 10

1,793

Participants

Federations · 4 represented

🇨🇿Czech Republic×51

🇺🇸United States of America×6

🇦🇿Azerbaijan×1

🇩🇪Germany×1

Top 3

🥇
Nathan Zeigler
🇺🇸USA·1785
8.5pts·2162perf+64.2
🥈
Ali Naghiyev
🇦🇿AZE·1767
8.0pts·2033perf+91.2
🥉
Jachym Fadrny
🇨🇿CZE·1715
7.0pts·1903perf+81.2

How it unfolded

Top 6 · 9 rounds

Nathan Zeigler led from R9; +0.5-point edge over the runner-up. Title race converged from 3 co-leaders at R4 to 1 by R9.

Co-leaders

Zeigler8.5Naghiyev8Fadrny7Rodling6.5Svetly6Murugan6

R9–R9 · LEAD HELD

Nathan Zeigler held the sole lead from R9 through R9 without losing it.

R6 · HEAD-TO-HEAD · WINNER VS 2ND

Nathan Zeigler drew with Ali Naghiyev (Black).

WIN STREAKS · 3 top finishers

Nathan Zeigler 5+3 wins (R1–R5, R7–R9)Ali Naghiyev 5 wins (R1–R5)Jachym Fadrny 3 wins (R1–R3)

Key matchups · top 4

Head-to-head between the four finishers

Player	1	2	3	4
1Nathan Zeigler	*	½	1	—
2Ali Naghiyev	½	*	1	1
3Jachym Fadrny	0	0	*	1
4Robert Rodling	—	0	0	*

Grille américaine

#	Player	Elo	Fed	R1	R2	R3	R4	R5	R6	R7	R8	R9	Pts	Bu C1	Bu	SB	Perf	Δ
1	Zeigler, Nathan	1785	USA	+58N	+11B	+7N	+3B	+5B	=2N	+18B	+9N	+12B	8.5	48.5	50.0	46.00	2162	+64.2
2	Naghiyev, Ali	1767	AZE	+51N	+21B	+29N	+27B	+17N	=1B	+3N	+4B	=5N	8.0	47.0	50.0	42.75	2033	+91.2
3	Fadrny, Jachym	1715	CZE	+30N	+26B	+4N	−1N	+6B	+5N	−2B	+10B	+14N	7.0	51.0	55.5	39.00	1903	+81.2
4	Rodling, Robert	1813	CZE	+35B	+28N	−3B	=21N	+36B	+27N	+12B	−2N	+19N	6.5	44.0	48.0	30.50	1827	+3.0
5	Svetly, Jiri	1811	CZE	+34N	+15B	+22N	+17B	−1N	−3B	=10N	+21B	=2B	6.0	49.5	54.0	31.75	1820	+3.0
6	Hunter, Nathan G	0	USA	+25B	=36N	+18B	=13N	−3N	=38B	+11B	=22N	+17B	6.0	42.0	46.0	29.75	1764	0.0
7	Vorlik, Jachym	1639	CZE	+60N	+14B	−1B	−19N	=37B	+26N	+36B	=17N	+18B	6.0	42.0	42.0	24.00	1791	+65.2
8	Murugan, Akil Kumar	0	USA	=32B	=13N	+52B	+28N	=10N	−12B	+33N	=19B	+20N	6.0	40.0	43.0	27.25	1750	0.0
9	Karolyi, Lukas	1874	CZE	+59B	−22N	+26B	+36N	=11B	=20N	+27B	−1B	=10N	5.5	43.0	44.0	22.50	1721	-29.2
10	Novakova, Blanka	1710	CZE	+41B	−27N	+46B	+32N	=8B	+19N	=5B	−3N	=9B	5.5	42.5	46.0	25.75	1819	+22.0
11	Klimes, Roman	1678	CZE	+31B	−1N	+49B	+23N	=9N	−18B	−6N	+43B	+30N	5.5	42.5	45.5	23.25	1674	0.0
12	Martinec, Jan	1729	CZE	+56B	−29N	=37B	+55N	+25B	+8N	−4N	+20B	−1N	5.5	42.0	44.5	23.00	1688	-7.2
13	Lizner, Milan	1833	CZE	=23N	=8B	+34N	=6B	−20N	+48B	=28B	+27N	=15N	5.5	41.0	44.5	26.00	1650	-24.2
14	Petkov, Andon	1794	CZE	+37B	−7N	−23B	+41N	+24B	=22B	+38N	+28N	−3B	5.5	40.5	44.5	24.00	1670	-25.4
15	Nespor, Ivan	1701	CZE	+44B	−5N	+41B	+29B	−27N	+23N	=17B	=18N	=13B	5.5	39.5	43.0	24.75	1764	+13.8
16	Fadrny, Jonas	1560	CZE	+39N	+20B	−17B	−18N	+50B	=31N	−19B	+37N	+28B	5.5	37.0	40.0	22.75	1682	+39.2
17	Weiss, Pavel	1729	CZE	+45N	+38B	+16N	−5N	−2B	+30B	=15N	=7B	−6N	5.0	45.5	49.0	23.25	1717	-1.2
18	Kennedy, David I	1732	USA	+46N	=55B	−6N	+16B	+21B	+11N	−1N	=15B	−7N	5.0	45.5	48.0	23.50	1735	+1.2
19	Cyron, Karel	1741	CZE	=42B	=24N	+35B	+7B	=22N	−10B	+16N	=8N	−4B	5.0	44.0	48.0	26.00	1664	-14.6
20	Weiss, Petr	1724	CZE	+52B	−16N	+24B	=25N	+13B	=9B	+22N	−12N	−8B	5.0	43.0	46.0	23.75	1757	+8.0
21	Bartak, Tobias	1642	CZE	+49B	−2N	+50B	=4B	−18N	+25N	+31B	−5N	=23B	5.0	43.0	46.0	21.25	1591	-16.4
22	Cipera, Josef	1699	CZE	+43N	+9B	−5B	+31N	=19B	=14N	−20B	=6B	=26N	5.0	42.5	46.0	24.25	1694	-1.6
23	Kavanova, Valentyna	1542	CZE	=13B	=32N	+14N	−11B	+33N	−15B	=40N	+38B	=21N	5.0	40.0	44.0	23.50	1748	+86.8
24	Pesek, Petr	1519	CZE	=33N	=19B	−20N	+43B	−14N	+45B	=34N	+29B	=32B	5.0	37.0	40.5	20.75	1647	+50.8
25	Kral, Ladislav	1633	CZE	−6N	+48B	+43N	=20B	−12N	−21B	=30N	+45B	+39N	5.0	37.0	40.5	19.25	1566	-10.2
26	Stejskal, Antonin	1564	CZE	+57B	−3N	−9N	+39B	=48N	−7B	+58N	+40B	=22B	5.0	37.0	38.5	15.75	1518	-16.8
27	Nait Raiss, Rayane	0	GER	+47N	+10B	+33N	−2N	+15B	−4B	−9N	−13B	=34N	4.5	45.5	49.0	21.25	1730	0.0
28	Stodola, Zdenek	1646	CZE	+53N	−4B	+30N	−8B	+45N	+40B	=13N	−14B	−16N	4.5	41.0	44.0	17.75	1591	-9.6
29	Paulik, Krystof	1572	CZE	+40N	+12B	−2B	−15N	−31B	+44N	=37B	−24N	+43N	4.5	40.0	43.5	18.50	1498	-20.4
30	Heral, Adam	1436	CZE	−3B	+57N	−28B	+35N	+32B	−17N	=25B	+36N	−11B	4.5	40.0	42.0	17.50	1612	+67.2
31	Marchal, David	0	CZE	−11N	+58B	+38N	−22B	+29N	=16B	−21N	=34B	=33N	4.5	38.5	40.0	17.25	1620	0.0
32	Novak, Jiri	1596	CZE	=8N	=23B	+40N	−10B	−30N	=37N	+49B	=39B	=24N	4.5	38.0	41.0	19.00	1397	-53.6
33	Slajs, Vlastimil	1780	CZE	=24B	+42N	−27B	=37N	−23B	+46N	−8B	+44N	=31B	4.5	36.5	40.0	17.75	1581	-23.0
34	Topencikova, Ellen	1525	CZE	−5B	+44N	−13B	−49N	+60B	+50N	=24B	=31N	=27B	4.5	35.0	35.0	13.50	1448	-10.8
35	Chadima, Ondrej	1541	CZE	−4N	+53B	−19N	−30B	+41N	=43B	−39N	+58B	+55N	4.5	33.0	34.5	12.75	1593	+15.2
36	Lefler, Vaclav	1705	CZE	+48N	=6B	+55N	−9B	−4N	+39B	−7N	−30B	=42N	4.0	40.0	42.5	15.00	1512	-35.6
37	Slaby, Martin	1521	CZE	−14N	+60B	=12N	=33B	=7N	=32B	=29N	−16B	=38N	4.0	40.0	40.0	14.50	1573	+8.6
38	Jirik, Radovan	1614	CZE	+50B	−17N	−31B	+44N	+49B	=6N	−14B	−23N	=37B	4.0	36.5	39.5	14.50	1325	-26.6
39	Smola, Ondrej	0	CZE	−16B	=52N	+42B	−26N	+56B	−36N	+35B	=32N	−25B	4.0	35.5	38.0	14.75	1514	0.0
40	Paulik, Tomas	0	CZE	−29B	+56N	−32B	+46N	+55B	−28N	=23B	−26N	=44B	4.0	33.0	35.5	12.75	1521	0.0
41	Dvorak, Tomas	1414	CZE	−10N	+47B	−15N	−14B	−35B	−57N	+60B	+56N	+50B	4.0	32.0	32.0	9.00	1508	+23.2
42	Komenda, Filip	1485	CZE	=19N	−33B	−39N	=53B	−43N	=51B	+52B	+49N	=36B	4.0	30.0	33.0	13.50	1637	+36.8
43	Kubakova, Laura	0	CZE	−22B	+59N	−25B	−24N	+42B	=35N	+47B	−11N	−29B	3.5	37.0	38.0	10.75	1505	0.0
44	Vorlik, Petr	0	CZE	−15N	−34B	+47N	−38B	+51N	−29B	+59N	−33B	=40N	3.5	33.5	34.5	9.50	1516	0.0
45	Heral, David	1452	CZE	−17B	−50N	+54B	+60N	−28B	−24N	+57B	−25N	=49B	3.5	30.5	30.5	6.50	832	-43.6
46	Klimes, Miroslav	1477	CZE	−18B	+61N	−10N	−40B	+59N	−33B	−50B	+57N	=47B	3.5	28.5	28.5	4.75	1523	+8.4
47	Hrbkova, Johana	1578	CZE	−27B	−41N	−44B	−57N	+54N	+53B	−43N	+51B	=46N	3.5	28.0	30.0	10.75	1466	-18.4
48	Rychly, Erik	1413	CZE	−36B	−25N	+59B	+58N	=26B	−13N	+55N	F	F	3.5	24.5	24.5	7.50	1633	+75.2
49	Eisenhour, Alan William	0	USA	−21N	+51B	−11N	+34B	−38N	=58B	−32N	−42B	=45N	3.0	34.0	35.5	10.00	1432	0.0
50	Mordach, Andrii	0	CZE	−38N	+45B	−21N	+51B	−16N	−34B	+46N	−55B	−41N	3.0	33.0	35.5	10.00	1410	0.0
51	Klenka, Samuel	1507	CZE	−2B	−49N	+57B	−50N	−44B	=42N	+56B	−47N	=53B	3.0	30.5	32.5	8.00	1490	-6.0
52	Brejcha, Jan	1452	CZE	−20N	=39B	−8N	−56N	+57B	−59B	−42N	=54B	+58N	3.0	28.0	29.0	7.00	1313	-34.0
53	Alvarez Jr, Adolfo	0	USA	−28B	−35N	=56B	=42N	−58B	−47N	=54N	+60B	=51N	3.0	26.5	26.5	6.25	1306	0.0
54	FIDE 23771259	0	—	F	F	−45N	F	−47B	+60N	=53B	=52N	+57B	3.0	16.0	16.0	5.00	1221	0.0
55	Pokorny, Jiri	1636	CZE	F	=18N	−36B	−12B	−40N	+56N	−48B	+50N	−35B	2.5	32.0	32.0	8.00	1406	-70.4
56	Jilek, Pavel	1476	CZE	−12N	−40B	=53N	+52B	−39N	−55B	−51N	−41B	+60N	2.5	29.0	29.0	4.50	1308	-21.2
57	Postlova, Agata	0	CZE	−26N	−30B	−51N	+47B	−52N	+41B	−45N	−46B	−54N	2.0	30.0	33.0	7.50	1292	0.0
58	Yurchenko, Oleh	1520	CZE	−1B	−31N	F	−48B	+53N	=49N	−26B	−35N	−52B	1.5	35.0	35.0	4.50	751	-93.2
59	Haupt, Richard	1559	CZE	−9N	−43B	−48N	F	−46B	+52N	−44B	F	F	1.0	25.5	25.5	3.00	1361	-44.0
60	Fadrny, Johan	0	CZE	−7B	−37N	F	−45B	−34N	−54B	−41N	−53N	−56B	0.0	30.5	30.5	0.00	702	0.0
61	FIDE 23771054	0	—	F	−46B	F	F	F	F	F	F	F	0.0	7.5	7.5	0.00	677	0.0

Key insights

Biggest movers and upsets — the story behind the numbers.

Top rating gainers

1Naghiyev, AliAZE
+91.2
8.0 pts · #2
2Kavanova, ValentynaCZE
+86.8
5.0 pts · #16
3Fadrny, JachymCZE
+81.2
7.0 pts · #4

Top rating losers

1Yurchenko, OlehCZE
-93.2
1.5 pts · #58
2Pokorny, JiriCZE
-70.4
2.5 pts · #49
3Novak, JiriCZE
-53.6
4.5 pts · #50

Biggest upsets

R8+269 Elo gap
Heral, Adam1436 beat Lefler, Vaclav1705
R3+252 Elo gap
Kavanova, Valentyna1542 beat Petkov, Andon1794
R5+238 Elo gap
Kavanova, Valentyna1542 beat Slajs, Vlastimil1780