61st International Akiba Rubinstein Chess Festival - INWEA DEVELOPMENT OPEN

SwissStandard

105 players participated in this 9-round tournament, held from 16 Aug 2025 to 24 Aug 2025 in Polanica-Zdroj, Poland. 37 titled players from 5 federations. Top 10 Elo average was 2381, and top seed was Dimitrios Mastrovasilis (🇬🇷 GRE, GM, 2545).

Toms Kantans (🇱🇻 LAT, GM, 2515) won with 8.5/9, ahead of Dimitrios Mastrovasilis (6.5) and Pawel Piekielny (6.5). Kantans won solo starting round 4.

The biggest upset came in round 3: Arkadiusz Wodniczak (1968) beat Marcel Kutowski (FM, 2282), a +314-point gap.

Location

🇵🇱Polanica-Zdroj, Poland

Dates

16 Aug 2025 → 24 Aug 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 · 9 rounds

Top seed

🇬🇷GMDimitrios Mastrovasilis2545

Avg top 10

2,381

Participants

105

Titled players · 37

GM×3

IM×3

FM×13

CM×9

WGM×1

WFM×4

WCM×4

Federations · 5 represented

🇵🇱Poland×101

🇱🇻Latvia×1

🇬🇷Greece×1

🇵🇪Peru×1

🇫🇷France×1

Top 3

🥇
GMToms Kantans
🇱🇻LAT·2515
8.5pts·2722perf+15.3
🥈
GMDimitrios Mastrovasilis
🇬🇷GRE·2545
6.5pts·2421perf-9.6
🥉
IMPawel Piekielny
🇵🇱POL·2280
6.5pts·2399perf+28.4

How it unfolded

Top 6 · 9 rounds

GM Toms Kantans led from R4; +2.0-point edge over the runner-up.

Co-leaders

Kantans8.5Mastrovasilis6.5Piekielny6.5Janeczko6.5Zawadzka6.5Rog6

R4–R9 · LEAD HELD

GM Toms Kantans never relinquished the lead after R4; final gap +2.0 over the runner-up.

R7 · HEAD-TO-HEAD · WINNER VS 2ND

GM Toms Kantans drew with GM Dimitrios Mastrovasilis (White).

R1–R6 · WIN STREAK

GM Toms Kantans won 6 in a row (R1–R6).

Key matchups · top 4

Head-to-head between the four finishers

Player	1	2	3	4
1GMToms Kantans	*	½	—	—
2GMDimitrios Mastrovasilis	½	*	½	—
3IMPawel Piekielny	—	½	*	—
4Jakub Janeczko	—	—	—	*

Grille américaine

#	Player	Elo	Fed	R1	R2	R3	R4	R5	R6	R7	R8	R9	Pts	Bu C1	Bu	SB	Perf	Δ
1	Kantans, TomsGM	2515	LAT	+33B	+54N	+36B	+67N	+19B	+23N	=2B	+8N	+10B	8.5	44.0	48.0	44.75	2722	+15.3
2	Mastrovasilis, DimitriosGM	2545	GRE	+97N	+25B	=3N	+73B	=18N	+9B	=1N	=10B	=8B	6.5	47.5	49.5	33.25	2421	-9.6
3	Piekielny, PawelIM	2280	POL	+57B	+34N	=2B	=20N	+24B	=6N	=15B	+7N	=23B	6.5	46.0	50.0	35.25	2399	+28.4
4	Zawadzka, JolantaWGM	2330	POL	+43B	−30N	+47B	+34N	=20B	+73N	−8B	+52N	+19B	6.5	40.5	44.0	30.25	2296	-2.7
5	Janeczko, Jakub	2251	POL	=102N	+95B	+27N	=59B	=31N	=20B	=30N	+21B	+22N	6.5	38.5	40.0	29.50	2228	-3.4
6	Cyborowski, LukaszGM	2457	POL	+89N	+38B	=9N	=22B	+13N	=3B	−10N	+20B	=11N	6.0	46.5	49.5	31.50	2313	-13.8
7	Kowalczyk, Rafal	2148	POL	+42B	=61N	+60B	=8N	+32B	=18B	+13N	−3B	=9N	6.0	44.0	48.0	30.75	2256	+27.0
8	Gibala, AdamFM	2300	POL	F	+72B	+48N	=7B	+83N	+22B	+4N	−1B	=2N	6.0	44.0	44.0	29.25	2418	+25.4
9	Kucza, KarolFM	2264	POL	+53B	+47N	=6B	=30N	+59B	−2N	+29B	=19N	=7B	6.0	43.5	47.5	29.75	2309	+10.8
10	Meers, HubertFM	2210	POL	=62B	+75N	=45B	=57N	+61B	+44N	+6B	=2N	−1N	6.0	42.0	45.5	27.50	2284	+17.2
11	Liskiewicz, JakubCM	2244	POL	+66N	=58B	=70N	=21B	=46N	+31B	=20N	+30B	=6B	6.0	39.5	43.0	28.50	2228	-5.6
12	Suska, SzymonFM	2168	POL	+65N	=59B	+44N	−18B	+71N	=67B	=32N	+26B	=15B	6.0	38.5	42.0	27.00	2208	+20.8
13	Zdybel, PrzemyslawFM	2249	POL	+94B	=45N	+62B	+76N	−6B	+57N	−7B	=24N	+33B	6.0	38.5	41.0	24.00	2210	-6.6
14	Zareba, PiotrCM	2237	POL	+93B	−32N	=33B	=78N	=43B	+53N	+47B	=44N	+39B	6.0	36.5	39.5	25.75	2157	-33.2
15	Rog, BartlomiejFM	2266	POL	−31N	=94B	+95N	+86B	=48N	+83B	=3N	+25B	=12N	6.0	36.0	38.5	23.75	2212	-10.6
16	Smietanska, WiktoriaCM	2237	POL	−70N	+66B	=46N	=58B	+78N	=84B	=31N	+38B	+32N	6.0	34.5	37.5	25.75	2152	-33.8
17	Komendecki, Antoni	2135	POL	=85B	=80N	=78B	=43N	+62B	=34N	=33B	+59N	+37B	6.0	34.5	37.5	25.25	2174	+18.8
18	Marszalek, MaciejFM	2286	POL	+50B	=27N	+32B	+12N	=2B	=7N	=19B	−23N	=24B	5.5	45.5	50.0	30.00	2259	-2.4
19	Mickiewicz, Piotr	2208	POL	+81N	=70B	+58N	+28B	−1N	+21B	=18N	=9B	−4N	5.5	45.0	48.5	26.00	2285	+18.8
20	Trochimczuk, Szymon	2123	POL	+98B	=60N	+84B	=3B	=4N	=5N	=11B	−6N	+47B	5.5	43.0	45.0	24.25	2238	+54.0
21	Stepinski, Piotr	2091	POL	+51B	−23N	+35B	=11N	+76B	−19N	+60B	−5N	+45B	5.5	41.5	45.0	24.50	2161	+33.1
22	Rekuc, PatrykFM	2153	POL	=80B	+85N	+61B	=6N	+30B	−8N	+59B	=37N	−5B	5.5	40.0	43.0	23.25	2217	+30.4
23	Mulawa, CyprianFM	2332	POL	F	+21B	−73N	+88B	+79N	−1B	+64N	+18B	=3N	5.5	40.0	40.0	24.75	2345	+4.4
24	Gajdzica, Maciej	2113	POL	+63N	−67B	+65N	+70B	−3N	=26B	+84N	=13B	=18N	5.5	39.0	42.0	23.00	2198	+20.0
25	Demski, Michal	2119	POL	+100B	−2N	=43B	=62N	=45B	+35N	+57B	−15N	+55B	5.5	39.0	40.5	21.50	2169	+13.5
26	Napieralski, Lucjan	1908	POL	−34B	=50N	+104B	=33N	+49B	=24N	+73B	−12N	+48B	5.5	38.5	39.0	20.50	2175	+126.8
27	Jedras, Piotr	2079	POL	+74N	=18B	−5B	=60N	=35B	+77N	−44B	+61N	+52B	5.5	37.5	41.0	22.75	2105	+7.2
28	Musial, IgorFM	2306	POL	+46N	+83B	=30B	−19N	−57B	=60N	+78B	+49N	=29B	5.5	36.5	39.5	22.75	2155	-30.8
29	Nagly, Wojciech	2133	POL	−71N	+81B	−31N	+87B	+86N	+58B	−9N	+51B	=28N	5.5	35.0	38.0	20.75	2137	+3.0
30	Paluszek, JanCM	2083	POL	+77B	+4B	=28N	=9B	−22N	+51N	=5B	−11N	=41B	5.0	45.5	49.0	26.00	2226	+47.9
31	Przybylski, BartoszFM	2041	POL	+15B	−36N	+29B	+49N	=5B	−11N	=16B	−39N	+82B	5.0	44.5	48.0	25.75	2230	+84.0
32	Wydmanski, Szymon	1974	POL	+96N	+14B	−18N	+40B	−7N	+48B	=12B	=41N	−16B	5.0	44.0	46.5	23.50	2236	+117.6
33	Przedlacki, Wiktor	2070	POL	−1N	+90B	=14N	=26B	=74N	+76B	=17N	+64B	−13N	5.0	43.0	46.0	21.00	2147	+30.0
34	Zerebiec, Maurycy	2073	POL	+26N	−3B	+99N	−4B	+72N	=17B	−37B	=60N	+63B	5.0	41.0	42.5	19.50	2114	+9.0
35	Boryna, Szymon	1946	POL	−38N	+97B	−21N	+89B	=27N	−25B	=43N	+68B	+57N	5.0	37.0	39.0	18.00	2119	+82.8
36	Lecki, Leonard	2223	POL	+86N	+31B	−1N	−83B	−58N	+70B	=46N	=57B	+65N	5.0	36.5	39.5	19.75	2128	-45.6
37	Kutowski, MarcelFM	2282	POL	−58N	=53B	−71N	+95B	+102N	+43B	+34N	=22B	−17N	5.0	35.5	37.0	18.50	2096	-82.0
38	Hackner, Oskar Anton	2106	POL	+35B	−6N	−57B	+100N	−51B	+94N	+63B	−16N	+90B	5.0	35.0	36.5	16.00	2098	-3.6
39	Szymkiewicz, Witold	2098	POL	−84N	+91B	+72N	=71B	−44N	=61B	+58N	+31B	−14N	5.0	33.5	36.5	19.25	2044	-26.0
40	Luberanski, JakubFM	2198	POL	−45B	+93N	+55B	−32N	=50B	=63N	F	+75N	+44B	5.0	33.5	33.5	19.75	2091	-21.2
41	Nowak, LukaszIM	2241	POL	=75B	−62N	=94N	+65B	=84N	=50B	+83N	=32B	=30N	5.0	32.0	34.5	18.75	2059	-20.3
42	Zeissel, Andrzej	1979	POL	−7N	=96B	−68N	=104B	=89N	+66B	=88N	+83B	+64N	5.0	29.5	30.0	15.50	2131	+36.2
43	Jaworski, Tymon	2050	POL	−4N	+74B	=25N	=17B	=14N	−37N	=35B	=72B	+80N	4.5	41.0	44.5	20.00	2099	+20.5
44	Siennicki, Ludwik	1943	POL	F	+52N	−12B	+92N	+39B	−10B	+27N	=14B	−40N	4.5	41.0	41.0	21.00	2195	+106.4
45	Buklaho, Ignacy	1987	POL	+40N	=13B	=10N	−79B	=25N	−52N	+96B	+73B	−21N	4.5	39.5	42.0	19.75	2152	+77.2
46	Staniczek, Kacper	2048	POL	−28B	+77N	=16B	+56N	=11B	−64N	=36B	−48N	+75B	4.5	39.0	42.5	20.00	2148	+47.2
47	Sniadecki, Oskar	2071	POL	+103N	−9B	−4N	=90B	+69N	+74B	−14N	+71B	−20N	4.5	38.0	39.0	13.50	2070	-2.0
48	Kiszkiel, Oskar	2087	POL	=76N	+101B	−8B	+85N	=15B	−32N	=61N	+46B	−26N	4.5	37.5	39.0	15.75	2029	-27.7
49	Padalka, ArtemCM	2124	POL	+91N	+71B	−67N	−31B	−26N	+86B	+50N	−28B	=51N	4.5	35.5	38.5	16.25	2068	-14.6
50	Sliwerski, Radoslaw	2046	POL	−18N	=26B	=87N	+99B	=40N	=41N	−49B	=74B	+72N	4.5	35.5	37.0	16.00	2055	+1.4
51	Standowicz, Mateusz	1934	POL	−21N	+89B	−88N	+97B	+38N	−30B	+79N	−29N	=49B	4.5	35.0	37.0	15.75	2094	+76.4
52	Futyma, Dawid	2135	POL	=87N	−44B	+101N	−84B	+80N	+45B	+71N	−4B	−27N	4.5	34.0	35.5	14.50	2013	-54.7
53	Sowa, Roch	2038	POL	−9N	=37N	−85B	+101B	+103N	−14B	=74N	=56B	+76N	4.5	33.0	34.0	12.50	2064	+9.6
54	Hury, TymoteuszCM	2121	POL	+90N	−1B	−86N	−72B	=87N	+69B	−75B	+81N	+77B	4.5	32.5	35.5	15.50	2027	-24.6
55	Mareau, Timothe	2055	FRA	−67N	+63B	−40N	−74B	+98N	=72B	+76N	+84B	−25N	4.5	32.0	34.0	14.25	2043	-9.9
56	Krzywda, AndrzejCM	2149	POL	=95N	+102B	−59N	−46B	=94B	=75N	=62B	=53N	+60B	4.5	29.5	31.0	14.00	2002	-35.2
57	Przybylski, Jan	2042	POL	−3N	+103B	+38N	=10B	+28N	−13B	−25N	=36N	−35B	4.0	44.5	45.5	17.00	2106	+28.1
58	Derejczyk, Mateusz	2044	POL	+37B	=11N	−19B	=16N	+36B	−29N	−39B	=77N	=61B	4.0	42.0	45.5	19.75	2100	+25.6
59	Ostojski, Dawid	1975	POL	+64B	=12N	+56B	=5N	−9N	+79B	−22N	−17B	F	4.0	42.0	42.0	18.25	2171	+40.0
60	Skrzyczek, Tomasz	1902	POL	+68N	=20B	−7N	=27B	+88N	=28B	−21N	=34B	−56N	4.0	41.5	44.5	17.75	2082	+39.2
61	Leszczewicz, Karol	1936	POL	+79N	=7B	−22N	+68B	−10N	=39N	=48B	−27B	=58N	4.0	40.5	44.0	17.25	2067	+57.0
62	Haladaj, Adam	1993	POL	=10N	+41B	−13N	=25B	−17N	=88B	=56N	+79B	F	4.0	39.5	39.5	18.00	2161	+70.0
63	Domanski, Wiktor	1947	POL	−24B	−55N	=66N	+81B	+68N	=40B	−38N	+89B	−34N	4.0	36.5	39.5	15.00	2033	+40.8
64	Rosa, Antoni	2148	POL	−59N	−86B	+91N	+75B	+70N	+46B	−23B	−33N	−42B	4.0	34.0	37.0	14.50	2001	-66.9
65	Kawulski-Chodkiewicz, Alexander	1985	POL	−12B	+82N	−24B	−41N	=99N	=87B	+94B	+92N	−36B	4.0	33.5	35.0	11.25	2052	+30.8
66	Wilgosz, Szczepan	2023	POL	−11B	−16N	=63B	−77N	+95B	−42N	+99B	=91N	+85B	4.0	33.0	34.5	10.50	1974	-23.9
67	Licznerski, LukaszIM	2452	POL	+55B	+24N	+49B	−1B	=73N	=12N	F	F	F	4.0	32.5	32.5	19.25	2309	-7.9
68	Ziobrowska, MajaWFM	2071	POL	−60B	=100N	+42B	−61N	−63B	+91N	=90B	−35N	+87B	4.0	31.0	32.5	13.25	1908	-75.6
69	Rychlik, Michal	1929	POL	+88N	−73B	−83N	=102B	−47B	−54N	+95B	=70N	+92B	4.0	27.5	29.0	11.00	2024	+22.8
70	Kawka, MilenaWCM	2017	POL	+16B	=19N	=11B	−24N	−64B	−36N	=91B	=69B	=79N	3.5	39.5	42.5	17.00	2050	+12.4
71	Wodniczak, Arkadiusz	1968	POL	+29B	−49N	+37B	=39N	−12B	+92N	−52B	−47N	−78B	3.5	38.5	41.5	16.00	2048	+17.4
72	Slusarczyk, AnnaWCM	1946	POL	+82B	−8N	−39B	+54N	−34B	=55N	=92B	=43N	−50B	3.5	37.5	40.5	14.00	2024	+32.8
73	Majek, Kacper	2127	POL	+105B	+69N	+23B	−2N	=67B	−4B	−26N	−45N	F	3.5	36.5	36.5	11.50	2136	-2.4
74	Wnuk, Piotr	1913	POL	−27B	−43N	+93B	+55N	=33B	−47N	=53B	=50N	F	3.5	36.0	38.5	14.50	2008	+39.2
75	Sniedziewski, Emil	2019	POL	=41N	−10B	=96N	−64N	+100B	=56B	+54N	−40B	−46N	3.5	36.0	37.5	12.00	2053	+14.8
76	Chmielek, KameliaWCM	1924	POL	=48B	+104N	+92B	−13B	−21N	−33N	−55B	+94N	−53B	3.5	35.5	36.0	8.25	2004	+33.4
77	Pyrek, Marcin	1920	POL	−30N	−46B	=81N	+66B	+97N	−27B	=89N	=58B	−54N	3.5	34.0	36.0	11.25	1976	+24.3
78	Majocha, Piotr	2052	POL	F	F	=17N	=14B	−16B	+85N	−28N	=80B	+71N	3.5	33.5	33.5	14.25	2119	+11.2
79	Witczak, Borys	2101	POL	−61B	+105N	+80B	+45N	−23B	−59N	−51B	−62N	=70B	3.5	33.5	33.5	9.75	1934	-82.4
80	Kaminska, ZuzannaWCM	1982	POL	=22N	=17B	−79N	=96B	−52B	=103N	+93B	=78N	−43B	3.5	33.0	34.0	12.25	1994	+4.0
81	Lasok, Marek	1987	POL	−19B	−29N	=77B	−63N	=82N	+97B	=87N	−54B	+99N	3.5	31.5	33.0	8.50	1963	-6.8
82	Szczotka, KlaraWFM	2105	POL	−72N	−65B	−90N	F	=81B	+100N	+85B	+86B	−31N	3.5	26.5	26.5	9.25	1935	-74.4
83	Matskevich, VarvaraWFM	2077	POL	+99B	−28N	+69B	+36N	−8B	−15N	−41B	−42N	F	3.0	38.0	38.0	10.50	2057	-12.4
84	Szydelko, Michal	1934	POL	+39B	F	−20N	+52N	=41B	=16N	−24B	−55N	F	3.0	36.0	36.0	15.00	2093	+26.6
85	Jankowski, Franciszek	1968	POL	=17N	−22B	+53N	−48B	=96N	−78B	−82N	+97B	−66N	3.0	34.0	36.0	10.75	1964	-1.5
86	Wites, Adam	1996	POL	−36B	+64N	+54B	−15N	−29B	−49N	+103B	−82N	F	3.0	34.0	34.0	9.50	2041	+14.8
87	Marek, Grzegorz	1973	POL	=52B	−92N	=50B	−29N	=54B	=65N	=81B	=96N	−68N	3.0	33.5	36.0	11.75	1953	-8.8
88	Wieckowski, Michal	2088	POL	−69B	+98N	+51B	−23N	−60B	=62N	=42B	−90N	F	3.0	33.0	35.0	11.00	1911	-79.6
89	Darowicki, Mariusz	2055	POL	−6B	−51N	+98B	−35N	=42B	+99N	=77B	−63N	F	3.0	33.0	34.5	7.75	1919	-32.6
90	Wandor, Adam	1956	POL	−54B	−33N	+82B	=47N	−92B	F	=68N	+88B	−38N	3.0	32.5	33.0	10.75	2003	+18.4
91	Ciupka, Kamil	1965	POL	−49B	−39N	−64B	+93N	+104N	−68B	=70N	=66B	F	3.0	31.0	31.5	7.25	1979	+1.8
92	Tokarz, IzabelaWFM	2090	POL	=101N	+87B	−76N	−44B	+90N	−71B	=72N	−65B	−69N	3.0	29.0	30.5	8.50	1825	-127.6
93	Mrozowski, Nikodem	2002	POL	−14N	−40B	−74N	−91B	+101N	+98B	−80N	+103B	F	3.0	27.5	28.5	4.50	1924	-38.0
94	Alvarado, CarlosCM	2032	PER	−13N	=15N	=41B	=103B	=56N	−38B	−65N	−76B	=100N	2.5	35.5	36.5	9.00	1920	-28.0
95	Kozera, Dawid	1980	POL	=56B	−5N	−15B	−37N	−66N	+101B	−69N	−98B	+103N	2.5	33.5	34.5	4.75	1911	-39.2
96	Iwanczuk, Krzysztof	2136	POL	−32B	=42N	=75B	=80N	=85B	F	−45N	=87B	F	2.5	31.0	31.0	9.00	1881	-48.6
97	Gbiorczyk, MikolajCM	2070	POL	−2B	−35N	+105B	−51N	−77B	−81N	+100B	−85N	−98N	2.0	29.5	29.5	1.50	1791	-133.2
98	Tokarz, Gabriela	1957	POL	−20N	−88B	−89N	F	−55B	−93N	−101B	+95N	+97B	2.0	25.0	25.0	4.50	1845	-45.6
99	Kopacki, Aleksander	1910	POL	−83N	F	−34B	−50N	=65B	−89B	−66N	+101N	−81B	1.5	28.5	28.5	3.50	1771	-51.6
100	Rutkowski, Feliks	1949	POL	−25N	=68B	=102N	−38B	−75N	−82B	−97N	F	=94B	1.5	27.5	27.5	4.00	1818	-48.0
101	Bochenek, Piotr	1930	POL	=92B	−48N	−52B	−53N	−93B	−95N	+98N	−99B	F	1.5	25.5	25.5	3.50	1774	-59.6
102	Lambrecht, Tomasz	2033	POL	=5B	−56N	=100B	=69N	−37B	F	F	F	F	1.5	21.5	21.5	6.00	1963	-10.2
103	Nguyen Doan, Bao Anh Angelina	1902	POL	−47B	−57N	F	=94N	−53B	=80B	−86N	−93N	−95B	1.0	27.5	27.5	3.00	1696	-70.8
104	Siennicki, Gustaw	2046	POL	F	−76B	−26N	=42N	−91B	F	F	F	F	0.5	20.0	20.0	2.50	1622	-81.6
105	Bociek, Piotr	1966	POL	−73N	−79B	−97N	F	F	F	F	F	F	0.0	11.0	11.0	0.00	1299	-38.8

Key insights

Biggest movers and upsets — the story behind the numbers.

Top rating gainers

1Napieralski, LucjanPOL
+126.8
5.5 pts · #25
2Wydmanski, SzymonPOL
+117.6
5.0 pts · #39
3Siennicki, LudwikPOL
+106.4
4.5 pts · #47

Top rating losers

1Gbiorczyk, MikolajCMPOL
-133.2
2.0 pts · #97
2Tokarz, IzabelaWFMPOL
-127.6
3.0 pts · #83
3Witczak, BorysPOL
-82.4
3.5 pts · #82

Biggest upsets

R3+314 Elo gap
Wodniczak, Arkadiusz1968 beat FMKutowski, Marcel2282
R5+264 Elo gap
Przybylski, Jan2042 beat FMMusial, Igor2306
R2+263 Elo gap
Wydmanski, Szymon1974 beat CMZareba, Piotr2237