1st Summer open Chess Square June 2025

Open SwissStandard

39 players participated in this 7-round tournament, held from 30 Jun 2025 to 08 Jul 2025 in Athens, Greece. 2 federations represented. Top 10 Elo average was 1954, and top seed was Panagiotis Kostas (🇬🇷 GRE, 2131).

Ioannis Panopoulos (🇬🇷 GRE, 1950) won with 5.5/7, ahead of Loukas Papadimitriou (5.5) and Panos Simitzoglou (5.5). Panopoulos shared the lead from round 2, winning on tie-break.

The biggest upset came in round 7: Ioannis X Sakellariou (1543) beat Ioannis Ntaifas (1798), a +255-point gap.

Location

🇬🇷Athens, Greece

Dates

30 Jun 2025 → 08 Jul 2025

Time control

Standard: 90 minutes with 30 second increment from move 1

System

Swiss · 7 rounds

Top seed

🇬🇷Panagiotis Kostas2131

Avg top 10

1,954

Participants

Federations · 2 represented

🇬🇷Greece×38

🇬🇪Georgia×1

Top 3

🥇
Ioannis Panopoulos
🇬🇷GRE·1950
5.5pts·2135perf+33.0
🥈
Loukas Papadimitriou
🇬🇷GRE·2084
5.5pts·2151perf+12.0
🥉
Panos Simitzoglou
🇬🇷GRE·1837
5.5pts·2067perf+41.8

How it unfolded

Top 6 · 7 rounds

Tight race until R7; 3 players tied at 5.5/7, decided on Buchholz.

Co-leaders

Simitzoglou5.5Papadimitriou5.5Panopoulos5.5Nemtsas5Sideris5Sarakenidis4.5

R7 · TIEBREAK CLUSTER

3 players finish on 5.5/7. Panopoulos takes the title on Buchholz Cut1 (27.5).

WIN STREAKS · 3 top finishers

Panos Simitzoglou 3 wins (R4–R6)Loukas Papadimitriou 3 wins (R1–R3)Ioannis Panopoulos 4 wins (R1–R4)

Key matchups · top 4

Head-to-head between the four finishers

Player	1	2	3	4
1Panos Simitzoglou	*	—	½	—
2Loukas Papadimitriou	—	*	0	1
3Ioannis Panopoulos	½	1	*	0
4Hristoforos Nemtsas	—	0	1	*

Grille américaine

#	Player	Elo	Fed	R1	R2	R3	R4	R5	R6	R7	Pts	Bu C1	Bu	SB	Perf	Δ
1	Panopoulos, Ioannis	1950	GRE	+14B	+9N	+7B	+2B	−4N	+18N	=3B	5.5	27.5	30.5	22.75	2135	+33.0
2	Papadimitriou, Loukas	2084	GRE	+23B	+8N	+20B	−1N	=18B	+12N	+4B	5.5	24.0	27.0	20.00	2151	+12.0
3	Simitzoglou, Panos	1837	GRE	+35B	=18N	=12B	+26N	+20B	+5B	=1N	5.5	22.5	23.5	17.50	2067	+41.8
4	Nemtsas, Hristoforos	2025	GRE	+15N	+27B	−5N	+13B	+1B	+6N	−2N	5.0	27.5	30.0	19.50	2022	+2.6
5	Sideris, Theodoros	1914	GRE	+22B	+28N	+4B	−18N	+7B	−3N	+8B	5.0	24.5	27.0	18.50	2010	+20.0
6	Sarakenidis, Nikolaos	1892	GRE	+37B	=11N	+31B	F	+25N	−4B	+9N	4.5	18.5	18.5	11.50	1862	-2.0
7	Poullas, Antonis	1875	GRE	+16N	+25B	−1N	+10B	−5N	+14B	F	4.0	24.5	27.0	13.50	1817	-5.4
8	Papiotis, Kimon	1806	GRE	+19N	−2B	+38N	−25B	+30N	+10B	−5N	4.0	22.5	23.0	10.00	1823	+5.6
9	Kazakos, Panteleimon	1770	GRE	+33N	−1B	=19N	+32B	=24N	+25B	−6B	4.0	20.5	22.0	9.00	1686	-11.6
10	Eradze, Malkhaz	1704	GEO	−18B	+29N	+22B	−7N	+19B	−8N	+21B	4.0	20.0	22.5	11.50	1716	+0.4
11	Troupis, Theodoros	1719	GRE	+36N	=6B	−13N	−27B	+26B	+31N	=12N	4.0	18.5	19.5	9.50	1695	-3.4
12	Alevizos, Konstantinos	1904	GRE	+32N	=24B	=3N	F	+27N	−2B	=11B	3.5	22.5	22.5	10.75	1844	-7.0
13	Nikitakis, Ioannis	1736	GRE	+21B	−20N	+11B	−4N	−14B	=29N	+26B	3.5	21.0	23.5	10.75	1706	-7.9
14	Nikolopoulos, Nikolaos S	1611	GRE	−1N	+33B	−25N	+38B	+13N	−7N	=19B	3.5	20.0	20.5	7.00	1717	+31.6
15	Tsimpourakis, Dimitrios	1670	GRE	−4B	+35N	−26B	+31N	=29B	+28N	F	3.5	17.5	18.5	6.75	1698	+2.4
16	Sakellariou, Ioannis X	1543	GRE	−7B	=21N	F	−30B	+36N	+35B	+27N	3.5	14.0	14.0	6.00	1641	+22.0
17	Panagoiliopoulos, Marios	1566	GRE	−20B	−26N	−21B	+34N	=38N	+37B	+31B	3.5	13.0	13.5	4.75	1484	-31.6
18	Kostas, Panagiotis	2131	GRE	+10N	=3B	F	+5B	=2N	−1B	F	3.0	29.5	32.5	14.50	1975	-17.0
19	Mastichiadis, Dimitrios	1509	GRE	−8B	+23N	=9B	F	−10N	+30B	=14N	3.0	21.0	21.0	9.25	1694	+55.6
20	Delithanasis, Dimitrios	1929	GRE	+17N	+13B	−2N	+28B	−3N	F	F	3.0	20.5	20.5	9.50	1864	-6.4
21	Mentzos, Apostolos	1444	GRE	−13N	=16B	+17N	−24B	=32N	+34B	−10N	3.0	19.5	21.0	7.75	1556	+36.8
22	Najjari Omidkhah, Soroush	1559	GRE	−5N	+39B	−10N	+36B	=28N	=27B	F	3.0	18.5	19.0	4.00	1644	+17.6
23	Tsampas, Charalampos	1703	GRE	−2N	−19B	=33N	+39B	−35N	+38B	=25N	3.0	14.0	14.5	3.00	1515	-30.8
24	Mamouzelos, Eleftherios	1727	GRE	+38B	=12N	F	+21N	=9B	F	F	3.0	14.0	14.0	7.25	1824	+23.2
25	Jovani, Antonios	0	GRE	F	−7N	+14B	+8N	−6B	−9N	=23B	2.5	23.0	23.0	9.00	1719	+32.0
26	Bardouniotis, Marios	1506	GRE	−27N	+17B	+15N	−3B	−11N	=32B	−13N	2.5	22.5	24.5	8.00	1595	+26.4
27	Ntaifas, Ioannis	1798	GRE	+26B	−4N	F	+11N	−12B	=22N	−16B	2.5	21.5	21.5	8.00	1652	-22.8
28	Mataragkas, Georgios	1735	GRE	+39N	−5B	+36N	−20N	=22B	−15B	F	2.5	16.0	16.0	3.00	1550	-24.0
29	Spyrou, Agamemnon Ioannis	0	GRE	F	−10B	=30N	+35B	=15N	=13B	F	2.5	14.5	14.5	5.75	1640	+8.0
30	Gkogka, Elvis	1568	GRE	F	F	=29B	+16N	−8B	−19N	+35N	2.5	14.0	14.0	5.75	1595	+2.6
31	Kormaris, Christos	0	GRE	F	+34B	−6N	−15B	+33N	−11B	−17N	2.0	18.5	18.5	3.00	1498	0.0
32	Tsitouras, Dimitrios	1555	GRE	−12B	F	+34N	−9N	=21B	=26N	F	2.0	14.5	14.5	4.25	1535	-10.0
33	Ntovas, Dimitrios	1481	GRE	−9B	−14N	=23B	+37N	−31B	F	F	1.5	13.5	13.5	2.50	1572	+8.0
34	Koliokitsou, Panagiota	1408	GRE	F	−31N	−32B	−17B	+39N	−21N	=37B	1.5	12.0	12.0	1.00	1360	-13.6
35	Osmani, Sokol	1523	GRE	−3N	−15B	F	−29N	+23B	−16N	−30B	1.0	20.5	20.5	3.00	1424	-12.2
36	Karatzanos, Konstantinos	0	GRE	−11B	+37N	−28B	−22N	−16B	F	F	1.0	14.5	14.5	1.00	1382	-70.8
37	Theodoratou, Foteini	1553	GRE	−6N	−36B	=39N	−33B	F	−17N	=34N	1.0	12.5	12.5	1.00	1315	-62.4
38	Tzannis, Panayotis	0	GRE	−24N	F	−8B	−14N	=17B	−23N	F	0.5	17.5	17.5	1.75	1316	0.0
39	Tsekouras, Stelios	1426	GRE	−28B	−22N	=37B	−23N	−34B	F	F	0.5	12.0	12.5	0.50	1226	-19.6

Key insights

Biggest movers and upsets — the story behind the numbers.

Top rating gainers

1Mastichiadis, DimitriosGRE
+55.6
3.0 pts · #14
2Simitzoglou, PanosGRE
+41.8
5.5 pts · #1
3Mentzos, ApostolosGRE
+36.8
3.0 pts · #16

Top rating losers

1Karatzanos, KonstantinosGRE
-70.8
1.0 pts · #36
2Theodoratou, FoteiniGRE
-62.4
1.0 pts · #37
3Panagoiliopoulos, MariosGRE
-31.6
3.5 pts · #19

Biggest upsets

R7+255 Elo gap
Sakellariou, Ioannis X1543 beat Ntaifas, Ioannis1798
R2+194 Elo gap
Mastichiadis, Dimitrios1509 beat Tsampas, Charalampos1703
R6+181 Elo gap
Panopoulos, Ioannis1950 beat Kostas, Panagiotis2131