2025 National Youth Championships - open U12

Open SwissStandard

50 players participated in this 9-round tournament, held from 06 Jul 2025 to 12 Jul 2025 in Thessaloniki, Greece. Top 10 Elo average was 1764, and top seed was Konstantinos I Ioannidis (🇬🇷 GRE, 1927).

Konstantinos I Ioannidis (🇬🇷 GRE, 1927) won with 8.0/9, ahead of Mattheos Konstantinos Kazakis (7.5) and Charalampos Lampos (6.5). Ioannidis won solo starting round 8.

The biggest upset came in round 2: Filippos Siozos (1550) beat Charalampos Lampos (1877), a +327-point gap.

Location

🇬🇷Thessaloniki, Greece

Dates

06 Jul 2025 → 12 Jul 2025

Time control

Standard: 90 minutes with 30 second increment from move 1

System

Swiss · 9 rounds

Top seed

🇬🇷Konstantinos I Ioannidis1927

Avg top 10

1,764

Participants

Federations · 1 represented

🇬🇷Greece×48

Top 3

🥇
Konstantinos I Ioannidis
🇬🇷GRE·1927
8.0pts·2064perf+50.0
🥈
Mattheos Konstantinos Kazakis
🇬🇷GRE·1918
7.5pts·1961perf+23.6
🥉
Charalampos Lampos
🇬🇷GRE·1877
6.5pts·1851perf-2.0

How it unfolded

Top 6 · 9 rounds

Konstantinos I Ioannidis led from R5; +0.5-point edge over the runner-up. Title race converged from 5 co-leaders at R4 to 1 by R5.

Co-leaders

Ioannidis8Kazakis7.5Lampos6.5Gkadakis6Megagiannis6Doukas6

R5–R9 · LEAD HELD

Konstantinos I Ioannidis held the sole lead from R5 through R9 without losing it.

R4 · HEAD-TO-HEAD · WINNER VS 2ND

Konstantinos I Ioannidis drew with Mattheos Konstantinos Kazakis (Black).

WIN STREAKS · 3 top finishers

Konstantinos I Ioannidis 3 wins (R1–R3)Mattheos Konstantinos Kazakis 3 wins (R1–R3)Charalampos Lampos 3 wins (R3–R5)

Key matchups · top 4

Head-to-head between the four finishers

Player	1	2	3	4
1Konstantinos I Ioannidis	*	½	1	½
2Mattheos Konstantinos Kazakis	½	*	½	½
3Charalampos Lampos	0	½	*	1
4Nikolaos Gkadakis	½	½	0	*

Grille américaine

#	Player	Elo	Fed	R1	R2	R3	R4	R5	R6	R7	R8	R9	Pts	Bu C1	Bu	SB	Perf	Δ
1	Ioannidis, Konstantinos I	1927	GRE	+8B	+10N	+15B	=2N	+5B	+3N	=4B	+6N	+9B	8.0	48.5	53.5	46.75	2064	+50.0
2	Kazakis, Mattheos Konstantinos	1918	GRE	+39B	+20N	+16B	=1B	=4N	+22B	+7N	=3N	+8B	7.5	46.0	49.5	39.25	1961	+23.6
3	Lampos, Charalampos	1877	GRE	+29N	−11B	+39N	+16N	+9B	−1B	+22N	=2B	+4N	6.5	46.5	50.0	32.75	1851	-2.0
4	Gkadakis, Nikolaos	1671	GRE	+44B	+13N	+9B	=17N	=2B	=15N	=1N	+5B	−3B	6.0	49.0	52.5	33.25	1853	+78.8
5	Megagiannis, Maximos	1919	GRE	+21N	=7B	+27N	+11B	−1N	=6B	+15B	−4N	+18B	6.0	46.0	50.5	30.75	1766	-52.1
6	Doukas, Nikolaos	1651	GRE	=40N	+19B	+32N	−7B	+10N	=5N	+17B	−1B	+24N	6.0	43.5	47.0	28.75	1772	+52.4
7	Danezis, Prodromos	1583	GRE	+42B	=5N	+28B	+6N	−15B	+8N	−2B	=18N	=12B	5.5	45.0	48.5	27.75	1704	+47.6
8	Bimpikas, Ioannis	1540	GRE	−1N	=35B	+31N	+28B	+26N	−7B	+24N	+19B	−2N	5.5	43.5	47.5	24.50	1742	+76.8
9	Nteneketzis, Paraskevas	1610	GRE	+41B	+43N	−4N	+24B	−3N	+23B	=19N	+15B	−1N	5.5	43.0	46.5	23.50	1716	+33.4
10	Dokidis, Panagiotis	1600	GRE	+35N	−1B	+33N	+18N	−6B	=24B	=23N	+17N	=11B	5.5	42.5	46.5	25.25	1703	+42.0
11	Siozos, Filippos	1550	GRE	+30N	+3N	=17B	−5N	−18B	=33B	+25N	+22B	=10N	5.5	41.5	45.5	27.25	1690	+45.6
12	Kostoglou, Apostolos	1511	GRE	+24N	−17N	=23B	=19B	+21N	+16N	=18B	=26B	=7N	5.5	39.5	44.0	26.75	1700	+88.4
13	Diakoloukas, Theodosios	1544	GRE	+50N	−4B	+41N	−22B	+32N	−19B	+33N	=16N	+23B	5.5	36.5	37.5	19.50	1609	+30.8
14	Tsagkas, Odysseas	1612	GRE	−34N	=31B	+35N	=32B	=33N	=29B	=40N	+39B	+26N	5.5	32.5	36.0	22.00	1640	+11.6
15	Zacharakis, Ilias	1624	GRE	+31N	+34B	−1N	+27B	+7N	=4B	−5N	−9N	=20B	5.0	44.5	48.5	23.50	1661	+13.6
16	Alexandrakis, Venizelos	1618	GRE	+45B	+25N	−2N	−3B	+39N	−12B	+21N	=13B	=19N	5.0	43.0	46.0	21.25	1631	-3.3
17	Arampatzis, Christos	1655	GRE	+47N	+12B	=11N	=4B	−22N	+25B	−6N	−10B	+27N	5.0	42.0	45.0	23.25	1590	-18.0
18	Tamiolakis, Grigorios	1666	GRE	=32N	+40B	=22N	−10B	+11N	+20B	=12N	=7B	−5N	5.0	41.5	45.0	23.75	1638	-14.4
19	Fraidakis, Matthaios Ioannis	1655	GRE	=46B	−6N	+43B	=12N	+44B	+13N	=9B	−8N	=16B	5.0	40.0	43.0	22.00	1565	+13.2
20	Ladopoulos, Vasileios	1579	GRE	+48N	−2B	+34N	=26B	=23N	−18N	=29B	+40B	=15N	5.0	38.5	40.0	18.25	1592	-6.4
21	Loutas, Emmanouil	1533	GRE	−5B	+42N	−25B	+37N	−12B	+45N	−16B	+38N	+31B	5.0	36.5	39.5	18.50	1630	+30.8
22	Papakyriakou, Petros	1625	GRE	+37B	=28N	=18B	+13N	+17B	−2N	−3B	−11N	=25B	4.5	44.0	48.0	21.50	1653	+10.0
23	Nikakis, Filippos	1671	GRE	+33N	−27B	=12N	+25N	=20B	−9N	=10B	+32B	−13N	4.5	40.0	44.0	20.50	1507	-68.4
24	Karantoniou, Stylianos	1677	GRE	−12B	+47N	+44B	−9N	+40B	=10N	−8B	+28N	−6B	4.5	39.5	42.5	17.25	1545	-62.8
25	Chronopoulos, Panagiotis Th	0	GRE	+36N	−16B	+21N	−23B	+27N	−17N	−11B	+33B	=22N	4.5	38.0	42.0	19.75	1588	0.0
26	Kalligeris, Ioannis	1654	GRE	−28B	+37N	+45B	=20N	−8B	=31N	+38B	=12N	−14B	4.5	38.0	41.0	18.25	1524	-46.5
27	Diamantidis, Theodoros	1544	GRE	+49B	+23N	−5B	−15N	−25B	+28N	=31B	+29N	−17B	4.5	38.0	39.0	16.50	1604	+20.4
28	Kouvaros, Vasileios Zeiron	1466	GRE	+26N	=22B	−7N	−8N	+42B	−27B	+30N	−24B	+41N	4.5	37.0	40.5	18.25	1472	+5.2
29	Di Giorgio, Victor	1512	GRE	−3B	=30N	=46B	=42N	+41B	=14N	=20N	−27B	+40N	4.5	36.5	39.5	17.75	1571	+18.8
30	Dimou, Konstantinos	0	GRE	−11B	=29B	=40N	=47N	−31B	+42N	−28B	+50B	+39N	4.5	32.0	33.0	13.50	1423	0.0
31	Psarianos, Emmanouil	1425	GRE	−15B	=14N	−8B	+35N	+30N	=26B	=27N	=36B	−21N	4.0	38.5	42.5	17.75	1428	-2.4
32	Gkadakis, Athanasios	1496	GRE	=18B	+46N	−6B	=14N	−13B	=36N	+41B	−23N	=35B	4.0	38.0	41.0	15.75	1536	+21.6
33	Mavidis, Christos	1510	GRE	−23B	+49N	−10B	+43N	=14B	=11N	−13B	−25N	+47B	4.0	37.5	38.5	13.00	1462	-15.2
34	Diamantopoulos, Marios	0	GRE	+14B	−15N	−20B	−44N	−36B	=37N	+42B	=47N	+46B	4.0	33.5	36.5	15.50	1486	0.0
35	Moutzouris, Ioannis	0	GRE	−10B	=8N	−14B	−31B	+49N	+43B	−39N	+48B	=32N	4.0	33.0	34.0	10.75	1292	0.0
36	Papadopoulos, Odysseas Panos	1554	GRE	−25B	−45N	−42B	+48B	+34N	=32B	=44N	=31N	=37B	4.0	30.5	32.0	13.25	1413	-49.6
37	Siskos, Vasileios P	1434	GRE	−22N	−26B	+50N	−21B	−38N	=34B	+49N	+43B	=36N	4.0	30.5	31.5	9.50	1227	-80.4
38	Sideropoulos, Georgios N	1542	GRE	−43B	−41N	+49B	−40N	+37B	+46N	−26N	−21B	+45N	4.0	30.0	31.0	11.00	1457	-38.4
39	Noulis, Ioannis	1528	GRE	−2N	+48B	−3B	+45N	−16B	=41N	+35B	−14N	−30B	3.5	39.5	41.0	10.25	1448	-80.4
40	Kamperidis, Georgios I	1437	GRE	=6B	−18N	=30B	+38B	−24N	+44N	=14B	−20N	−29B	3.5	39.0	42.5	15.50	1513	+16.0
41	Chalkias, Nikolaos Al	0	GRE	−9N	+38B	−13B	+46N	−29N	=39B	−32N	+44B	−28B	3.5	35.0	38.0	12.25	1462	+26.0
42	Alepoudeas, Dimitrios	0	GRE	−7N	−21B	+36N	=29B	−28N	−30B	−34N	+49B	+48N	3.5	33.5	34.5	8.75	1388	0.0
43	Sidiras, Angelos	0	GRE	+38N	−9B	−19N	−33B	+47B	−35N	=46B	−37N	+50N	3.5	32.5	33.5	9.50	1447	0.0
44	Skodras, Dionysios Eleftherios	1506	GRE	−4N	+50B	−24N	+34B	−19N	−40B	=36B	−41N	+49N	3.5	31.5	32.5	8.00	1158	-86.4
45	Koutsionas, Athanasios	1403	GRE	−16N	+36B	−26N	−39B	+48N	−21B	=47B	=46N	−38B	3.0	32.0	33.5	8.50	1399	-2.8
46	Tsellos, Vasileios	1496	GRE	=19N	−32B	=29N	−41B	+50N	−38B	=43N	=45B	−34N	3.0	31.5	32.5	9.00	1288	-65.2
47	Ouzounstefanis, Ioannis	1494	GRE	−17B	−24B	=48N	=30B	−43N	+50B	=45N	=34B	−33N	3.0	30.0	31.0	7.50	1233	-57.6
48	Mavroeidis, Markos	0	GRE	−20B	−39N	=47B	−36N	−45B	−49B	+50N	−35N	−42B	1.5	27.0	28.0	2.50	1206	0.0
49	FIDE 541001540	0	—	−27N	−33B	−38N	−50B	−35B	+48N	−37B	−42N	−44B	1.0	29.0	30.0	1.50	743	0.0
50	FIDE 541009851	0	—	−13B	−44N	−37B	+49N	−46B	−47N	−48B	−30N	−43B	1.0	28.5	29.5	1.00	739	0.0

Key insights

Biggest movers and upsets — the story behind the numbers.

Top rating gainers

1Kostoglou, ApostolosGRE
+88.4
5.5 pts · #7
2Gkadakis, NikolaosGRE
+78.8
6.0 pts · #4
3Bimpikas, IoannisGRE
+76.8
5.5 pts · #8

Top rating losers

1Skodras, Dionysios EleftheriosGRE
-86.4
3.5 pts · #45
2Siskos, Vasileios PGRE
-80.4
4.0 pts · #47
3Noulis, IoannisGRE
-80.4
3.5 pts · #41

Biggest upsets

R2+327 Elo gap
Siozos, Filippos1550 beat Lampos, Charalampos1877
R8+248 Elo gap
Gkadakis, Nikolaos1671 beat Megagiannis, Maximos1919
R1+188 Elo gap
Kouvaros, Vasileios Zeiron1466 beat Kalligeris, Ioannis1654