II Arche Chess Open B

Open SwissStandard

46 players participated in this 9-round tournament, held from 21 Feb 2026 to 28 Feb 2026 in Lublin, Poland. Top 10 Elo average was 1635, and top seed was Jakub Mazurek (🇵🇱 POL, 1699).

Krystian Debczak (🇵🇱 POL, 1602) won with 7.5/9, ahead of Michal Baranowski (7.0) and Maksymilian Solski (6.5). Debczak shared the lead from round 6 and won solo starting round 8.

The biggest upset came in round 8: Jonatan Klosowski (1425) beat Artur Chlewinski (1602), a +177-point gap.

Location

🇵🇱Lublin, Poland

Dates

21 Feb 2026 → 28 Feb 2026

Time control

Standard: 90 minutes for game with 30 seconds delay from move 1

System

Swiss · 9 rounds

Top seed

🇵🇱Jakub Mazurek1699

Avg top 10

1,635

Participants

Federations · 1 represented

🇵🇱Poland×45

Top 3

🥇
Krystian Debczak
🇵🇱POL·1602
7.5pts·1997perf+49.2
🥈
Michal Baranowski
🇵🇱POL·1697
7.0pts·1813perf+25.6
🥉
Maksymilian Solski
🇵🇱POL·1634
6.5pts·1691perf+22.4

How it unfolded

Top 6 · 9 rounds

Krystian Debczak led from R8; +0.5-point edge over the runner-up. Title race converged from 3 co-leaders at R4 to 1 by R8.

Co-leaders

Debczak7.5Baranowski7Solski6.5Stepnik6.5Mazurek6Kedziora6

R8–R9 · LEAD HELD

Krystian Debczak held the sole lead from R8 through R9 without losing it.

R7 · HEAD-TO-HEAD · WINNER VS 2ND

Krystian Debczak drew with Michal Baranowski (White).

WIN STREAKS · 3 top finishers

Krystian Debczak 5 wins (R2–R6)Michal Baranowski 3 wins (R1–R3)Maksymilian Solski 3 wins (R1–R3)

Key matchups · top 4

Head-to-head between the four finishers

Player	1	2	3	4
1Krystian Debczak	*	½	—	—
2Michal Baranowski	½	*	½	—
3Maksymilian Solski	—	½	*	1
4Hubert Stepnik	—	—	0	*

Grille américaine

#	Player	Elo	Fed	R1	R2	R3	R4	R5	R6	R7	R8	R9	Pts	Bu C1	Bu	SB	Perf	Δ
1	Debczak, Krystian	1602	POL	−11N	+46B	+20N	+14B	+28N	+5B	=2B	+8N	+7N	7.5	43.5	43.5	34.50	1997	+49.2
2	Baranowski, Michal	1697	POL	+41N	+19B	+6N	=3B	=5N	+8B	=1N	=7B	+9N	7.0	47.5	50.0	37.00	1813	+25.6
3	Solski, Maksymilian	1634	POL	+10B	+32N	+21B	=2N	−8B	+4N	+9B	−6B	+14N	6.5	45.5	49.0	34.00	1691	+22.4
4	Stepnik, Hubert	1590	POL	+46N	+11B	−5N	=21B	+16N	−3B	+14N	+12B	+10N	6.5	43.5	43.5	28.75	1598	+0.8
5	Mazurek, Jakub	1699	POL	+24B	+25N	+4B	=8N	=2B	−1N	−7N	+27B	+19N	6.0	46.0	50.0	30.25	1696	+0.2
6	Chochowski, Jakub	1544	POL	+12N	+17B	−2B	+13N	−9B	+24N	+15B	+3N	−8B	6.0	45.5	50.0	32.00	1624	+24.8
7	Kedziora, Antoni	1587	POL	=28B	=29N	+35B	+23N	+15B	=9N	+5B	=2N	−1B	6.0	43.5	47.0	29.25	1755	+54.4
8	Ozoga, Bartosz	1681	POL	F	+42B	+14N	=5B	+3N	−2N	+10B	−1B	+6N	5.5	47.0	49.5	28.50	1696	+4.2
9	Rozanski, Milosz	1610	POL	+40N	=27B	=16N	+11B	+6N	=7B	−3N	+13B	−2B	5.5	45.5	48.0	27.00	1524	-28.4
10	Niewolik, Tomasz	0	POL	−3N	=31B	+36N	+34B	+18N	+12B	−8N	+21B	−4B	5.5	40.5	44.0	23.50	1548	0.0
11	Lubanski, Andrzej	0	POL	+1B	−4N	+22B	−9N	=33B	+32N	−21N	+18B	+37N	5.5	40.0	43.5	25.25	1610	0.0
12	Litwajtis, Pola	0	POL	−6B	=33N	+26B	+?B	+25N	−10N	+23B	−4N	+20B	5.5	39.5	39.5	19.75	1569	0.0
13	Szarawarski, Michal	0	POL	−18N	+45B	+19N	−6B	=27N	+16B	+?N	−9N	+22B	5.5	34.0	34.0	16.00	1560	0.0
14	Borowik, Grzegorz	1492	POL	+44N	+34B	−8B	−1N	+29B	+35N	−4B	+15N	−3B	5.0	42.0	42.0	16.00	1502	+1.6
15	Segit, Maksymilian	1649	POL	=20N	+30B	+27N	=18B	−7N	+21B	−6N	−14B	+31N	5.0	38.5	42.5	21.00	1390	-82.4
16	Olkuski, Tadeusz	1563	POL	=29B	+38N	=9B	=32N	−4B	−13N	=30B	+28B	+27N	5.0	37.0	40.5	20.00	1541	-2.4
17	Walczyna, Karol	0	POL	+33B	−6N	−32B	=26N	=36B	+39N	=24B	=23N	+29B	5.0	34.0	37.5	19.50	1509	0.0
18	Augustyniak, Rafal	1590	POL	+13B	−21N	+24B	=15N	−10B	+30N	−22B	−11N	+40B	4.5	39.0	41.5	19.00	1547	-3.6
19	Smoliga, Julian	1524	POL	+26B	−2N	−13B	−35N	+38B	+41B	+28N	=22N	−5B	4.5	38.5	41.0	16.75	1507	-5.2
20	Putowski, Lukasz	1416	POL	=15B	=22N	−1B	+38N	−24B	+33N	=36B	+32N	−12N	4.5	37.5	41.0	17.00	1554	+43.2
21	Biba, Yurii	0	POL	F	+18B	−3N	=4N	+32B	−15N	+11B	−10N	+?B	4.5	37.0	37.0	16.75	1602	0.0
22	Rozanski, Ignacy	1519	POL	=36N	=20B	−11N	+30B	=37N	=27B	+18N	=19B	−13N	4.5	36.0	39.5	18.50	1592	+15.6
23	Wyrwisz, Lukasz	1529	POL	=30N	+36B	=34N	−7B	=41N	+28B	−12N	=17B	=25N	4.5	36.0	38.5	17.25	1457	-17.2
24	Koziel, Jan	1477	POL	−5N	+43B	−18N	+40B	+20N	−6B	=17N	−37B	+33N	4.5	35.5	37.5	15.00	1493	+4.0
25	Bogdanowicz, Hubert	1529	POL	+43B	−5B	+40N	−28N	−12B	=29N	=31B	+30N	=23B	4.5	34.5	36.5	14.75	1422	-10.4
26	Pachol, Michal	0	POL	−19N	=41B	−12N	=17B	=40N	−34B	+45N	+42B	+32B	4.5	29.5	29.5	11.00	1517	0.0
27	Prusko, Pawel	1478	POL	+45B	=9N	−15B	=29N	=13B	=22N	+35B	−5N	−16B	4.0	39.0	39.0	13.25	1367	-21.2
28	Tylus, Piotr	0	POL	=7N	=?B	+42N	+25B	−1B	−23N	−19B	−16N	+36B	4.0	38.0	38.0	13.50	1455	0.0
29	Wolkowski, Piotr	0	POL	=16N	=7B	=?N	=27B	−14N	=25B	+34N	=33B	−17N	4.0	36.5	36.5	15.00	1540	0.0
30	Mystkowski, Franciszek	0	POL	=23B	−15N	+33B	−22N	+34N	−18B	=16N	−25B	+42N	4.0	35.0	37.5	14.25	1517	0.0
31	Shymanskyi, Vladyslav	0	POL	−32B	=10N	−39B	−33N	+44B	+40B	=25N	+35N	−15B	4.0	31.5	31.5	11.00	1170	0.0
32	Korycki, Blazej	1507	POL	+31N	−3B	+17N	=16B	−21N	−11B	+41N	−20B	−26N	3.5	39.5	42.0	14.00	1432	-17.2
33	Kolsut, Bartosz	1573	POL	−17N	=12B	−30N	+31B	=11N	−20B	+43B	=29N	−24B	3.5	37.0	39.0	13.50	646	-54.0
34	Chlewinski, Artur	1602	POL	+35B	−14N	=23B	−10N	−30B	+26N	−29B	−39N	+41B	3.5	34.5	37.0	12.75	1391	-23.4
35	Kuprowski, Mikolaj	0	POL	−34N	+44B	−7N	+19B	+42N	−14B	−27N	−31B	=38N	3.5	33.0	33.0	8.75	1401	0.0
36	Pecyna, Krystian	0	POL	=22B	−23N	−10B	+44N	=17N	+42B	=20N	−?B	−28N	3.5	30.5	30.5	9.50	1423	0.0
37	Stawski, Krystian	0	POL	−42N	−40B	F	+39N	=22B	−?B	+38N	+24N	−11B	3.5	26.5	26.5	13.75	1485	0.0
38	Rogalski, Daniel	0	POL	=?N	−16B	=41N	−20B	−19N	+44N	−37B	+43N	=35B	3.5	25.5	25.5	5.00	1257	0.0
39	Klosowski, Jonatan	1425	POL	F	F	+31N	−37B	+45N	−17B	=42N	+34B	—	3.5	24.0	24.0	8.75	1739	+32.8
40	Gorski, Krzysztof	0	POL	−9B	+37N	−25B	−24N	=26B	−31N	F	+41B	−18N	2.5	33.5	33.5	8.25	1291	0.0
41	Kaczan, Franciszek	1461	POL	−2B	=26N	=38B	+45N	=23B	−19N	−32B	−40N	−34N	2.5	33.5	33.5	6.25	1206	-51.2
42	Maczynska, Agnieszka	1495	POL	+37B	−8N	−28B	+43N	−35B	−36N	=39B	−26N	−30B	2.5	32.0	34.0	7.25	1359	-13.6
43	FIDE 545026815	0	—	−25N	−24N	+44B	−42B	−?N	+45B	−33N	−38B	F	2.0	18.5	18.5	0.00	717	0.0
44	Kepka, Dominik	0	POL	−14B	−35N	−43N	−36B	−31N	−38B	F	—	—	0.0	22.0	24.0	0.00	694	0.0
45	Niewolik, Jan	0	POL	−27N	−13N	F	−41B	−39B	−43N	−26B	—	—	0.0	22.0	22.0	0.00	648	0.0
46	Twardowski, Mateusz	0	POL	−4B	−1N	F	—	—	—	—	—	—	0.0	14.0	17.5	0.00	798	0.0

Key insights

Biggest movers and upsets — the story behind the numbers.

Top rating gainers

1Kedziora, AntoniPOL
+54.4
6.0 pts · #9
2Debczak, KrystianPOL
+49.2
7.5 pts · #3
3Putowski, LukaszPOL
+43.2
4.5 pts · #15

Top rating losers

1Segit, MaksymilianPOL
-82.4
5.0 pts · #23
2Kolsut, BartoszPOL
-54.0
3.5 pts · #45
3Kaczan, FranciszekPOL
-51.2
2.5 pts · #40

Biggest upsets

R8+177 Elo gap
Klosowski, Jonatan1425 beat Chlewinski, Artur1602
R8+157 Elo gap
Borowik, Grzegorz1492 beat Segit, Maksymilian1649
R6+157 Elo gap
Putowski, Lukasz1416 beat Kolsut, Bartosz1573