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4th Open AO Leonteiou O. Vazelakis 2025

Open SwissStandard

24 players participated in this 6-round tournament, held from 15 Nov 2025 to 20 Dec 2025 in Athens, Greece. Top 10 Elo average was 1638, and top seed was Christos Nikolaos Deligiannis (πŸ‡¬πŸ‡· GRE, 2003).

Nikolaos Koliousis (πŸ‡¬πŸ‡· GRE, 1661) won with 5.5/6, ahead of Vasileios N Lanaras (4.0) and Omar El Champasi (4.0). Koliousis won solo starting round 3.

The biggest upset came in round 2: Marios Nikolaos Katsaros (1621) beat Panagiotis Sifonios (1755), a +134-point gap.

Location
πŸ‡¬πŸ‡·Athens, Greece
Dates
15 Nov 2025 β†’ 20 Dec 2025
Time control
Standard: 90 minutes with 30 second increment from move 1
System
Swiss Β· 6 rounds
Top seed
πŸ‡¬πŸ‡·Christos Nikolaos Deligiannis2003
Avg top 10
1,638
Participants
24
Federations Β· 1 represented
πŸ‡¬πŸ‡·GreeceΓ—19
Top 3

How it unfolded

Top 6 Β· 6 rounds

Nikolaos Koliousis led from R3; +1.5-point edge over the runner-up.

Co-leaders
10
3
1
1
1
1
1.534.56R1R2R3R4R5R6
Koliousis5.5Lanaras4El Champasi4Katsaros3.5Androulakis3.5Panagoiliopoulos3.5
R3–R6 Β· LEAD HELD

Nikolaos Koliousis never relinquished the lead after R3; final gap +1.5 over the runner-up.

R5 Β· HEAD-TO-HEAD Β· WINNER VS 2ND

Nikolaos Koliousis drew with Vasileios N Lanaras (Black).

WIN STREAKS Β· 2 top finishers

Nikolaos Koliousis 4 wins (R1–R4)Omar El Champasi 3 wins (R3–R5)

Key matchups Β· top 4

Head-to-head between the four finishers
Player1234
1Nikolaos Koliousis*
Β½
1
β€”
2Vasileios N Lanaras
Β½
*β€”
Β½
3Omar El Champasi
0
β€”*β€”
4Marios Nikolaos Katsarosβ€”
Β½
β€”*

Grille amΓ©ricaine

#PlayerEloFedR1R2R3R4R5R6PtsBu C1BuSBPerfΞ”
1Koliousis, Nikolaos1661GRE+14N+9B+16N+4B=2N+3N5.516.518.516.502246+13.6
2Lanaras, Vasileios N0GRE+10N+5B=6N+20B=1Bβˆ’11N4.018.520.012.5016850.0
3El Champasi, Omar0GRE+7Bβˆ’4N+15B+17N+20Nβˆ’1B4.016.017.58.501706-20.0
4Androulakis, Radamanthys Pavlos1502GRE+23N+3B=20Bβˆ’1Nβˆ’9B+17N3.516.016.06.751427-5.2
5Panagoiliopoulos, Marios1536GRE+18Bβˆ’2Nβˆ’11B+19N=13B+20N3.513.515.06.751156-3.2
6Katsaros, Marios Nikolaos1621GREF+7N=2B+8N+16BF3.512.012.010.002369+52.8
7Sifonios, Panagiotis1755GREβˆ’3Nβˆ’6BF+18N+8B+15B3.014.514.57.001747-0.2
8Osmani, Sokol1512GREF+18N+13Bβˆ’6Bβˆ’7N+14B3.013.013.06.50884-11.2
9Nomikos, Goulielmos1438GRE+21Bβˆ’1NF+14B+4NF3.012.012.06.501560+12.4
10Tsitsiridakis, Evangelos1488GREβˆ’2BF+14N+21Bβˆ’15N+18N3.011.011.05.00939-7.6
11Deligiannis, Christos Nikolaos2003GREF+13B+5NFF+2B3.010.010.010.002404+1.6
12Brazios, Konstantinos1516GRE+22Bβˆ’20N+19Bβˆ’16N+17BF3.010.010.04.001499-1.6
13Gourgiotis, Nestor0GRE+17Bβˆ’11Nβˆ’8N+24B=5NF2.514.514.53.751556-4.4
14FIDE 421606770β€”βˆ’1B+21Nβˆ’10Bβˆ’9N+22Bβˆ’8N2.015.515.51.007250.0
15Chatzinikolaou, Alexandros1738GRE+19BFβˆ’3NF+10Bβˆ’7N2.014.014.05.001622-5.8
16Chatzinikolaou, Nina Loukia1459GRE+24NFβˆ’1B+12Bβˆ’6NF2.014.014.03.0014720.0
17XIANG, ZIHUI1532GREβˆ’13N+23B+22Nβˆ’3Bβˆ’12Nβˆ’4B2.013.013.00.00687-48.0
18Dolgyras, Petros0GREβˆ’5Nβˆ’8B+24Nβˆ’7B+23Nβˆ’10B2.012.512.50.007780.0
19Bratsos, Konstantinos0GREβˆ’15N+24Bβˆ’12Nβˆ’5B+21NF2.09.59.51.008040.0
20Syngounis, Filippos0GREF+12B=4Nβˆ’2Nβˆ’3Bβˆ’5B1.518.018.04.751510+14.4
21FIDE 421848510β€”βˆ’9Nβˆ’14BFβˆ’10Nβˆ’19B+24N1.010.010.00.006640.0
22FIDE 5410168900β€”βˆ’12NFβˆ’17BFβˆ’14NF0.012.014.00.007360.0
23FIDE 5410169040β€”βˆ’4Bβˆ’17NFFβˆ’18BF0.010.510.50.007070.0
24FIDE 421803410β€”βˆ’16Bβˆ’19Nβˆ’18Bβˆ’13NFβˆ’21B0.09.59.50.006420.0

Key insights

Biggest movers and upsets β€” the story behind the numbers.

Top rating gainers
Top rating losers
Biggest upsets
4th Open AO Leonteiou O. Vazelakis 2025 β€” Athens, Greece | Chess Tournament Results | ChessStats