John Costello
IOM · FIDE ID 451819 · 10 tournament games since 2026
Standard
1806
#9 in IOM (active)
Rapid
1820
#9 in IOM (active)
Blitz
–
Unrated
Score
35%
3 W · 1 D · 6 L
Opp. avg
1926
Last 10 games
Last game
2026-09-27
46th FIDE Chess Olympiad Samarkand 2026 | Open | Matches 63-87
Prep summary
- As White: 1.d4 in 100% of games (scores 13%).
- Against 1.e4: 1...d6 in 2 of 3 games (Pirc Defense), scoring 50%.
Based on 10 over-the-board games. 4 with White (13%), 6 with Black (50%).
Openings as White
First move
| 1.d4 | 4 | 13% |
Most played
| Opening | Games | Score |
|---|---|---|
| King's Indian Defense: Normal Variation, Rare Defenses | 1 | 0% |
| Queen's Gambit Declined: Albin Countergambit | 1 | 50% |
| Semi-Slav Defense: Noteboom Variation | 1 | 0% |
| Queen's Indian Defense: Kasparov-Petrosian Variation, Marco Defense | 1 | 0% |
Openings as Black
Against 1.e4 (3 games)
| 1...d6 Pirc Defense | 2 | 50% |
| 1...d5 Scandinavian Defense | 1 | 0% |
Against 1.d4 (1 game)
| 1...Nf6 Indian Defense | 1 | 100% |
Most played
| Opening | Games | Score |
|---|---|---|
| Pirc Defense | 2 | 50% |
| Scandinavian Defense: Main Line, Mieses Variation | 1 | 0% |
| Grünfeld Defense: Russian Variation | 1 | 100% |
| Nimzo-Larsen Attack: Classical Variation | 1 | 100% |
| Zukertort Opening | 1 | 0% |
Recent games
| Date | Opponent and event | Result |
|---|---|---|
| 2026-09-27 | Mashala Kabamwanishi (1940) 46th FIDE Chess Olympiad Samarkand 2026 | Open | Matches 63-87 | L |
| 2026-09-26 | Henry Marwa Michael (1807) 46th FIDE Chess Olympiad Samarkand 2026 | Open | Matches 63-87 | L |
| 2026-09-25 | Marc Delrieu (1564) 46th FIDE Chess Olympiad Samarkand 2026 | Open | Matches 88+ | ½ |
| 2026-09-24 | Mohamed Abdou (1806) 46th FIDE Chess Olympiad Samarkand 2026 | Open | Matches 63-87 | W |
| 2026-09-23 | Ngwenya Kwanele Mangaliso (1694) 46th FIDE Chess Olympiad Samarkand 2026 | Open | Matches 88+ | W |
| 2026-09-21 | Jerome MBOULA MBOUMBA (1812) 46th FIDE Chess Olympiad Samarkand 2026 | Open | Matches 63-87 | L |
| 2026-09-20 | Orlando Husbands (2222) 46th FIDE Chess Olympiad Samarkand 2026 | Open | Matches 63-87 | L |
| 2026-09-18 | Sai Han Thiha (2099) 46th FIDE Chess Olympiad Samarkand 2026 | Open | Matches 63-87 | L |
| 2026-09-17 | Roger Rashid Canto 46th FIDE Chess Olympiad Samarkand 2026 | Open | Matches 88+ | W |
| 2026-09-16 | Georgijs Germanovs (2389) 46th FIDE Chess Olympiad Samarkand 2026 | Open | Matches 38-62 | L |
Data: FIDE rating list (October 2026 list; national ranks count active players) and tournament games broadcast on Lichess since 2020 (open data, CC0). Results are matched to FIDE players by name or FIDE ID and may be incomplete. This page shows public chess results only. Is this you and you want the page removed? Email chessmoose1@gmail.com and we remove it.