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Player profile

Costello, John

Standard: 1807 Rapid: 1820 Blitz: 0 (last updated 2026-11-02)
FIDE ID: 451819 (view FIDE profile)
Federation: IOM Sex: M Birth Year: 1966 Age: 60
Title: — Women's title: — Other title: — FOA title: —
Games: 10 Wins: 3 (30%) Draws: 1 (10%) Losses: 6 (60%)
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Dossier

10 of 10 games analyzed.

Accuracy: 81.2%
Opened d4: 4/4
Same-side castling: 8Castled kingside: 7Castled queenside: 2Opposite-side castling: 1Did not castle: 1
Fianchettoed kingside: 5Played in the center: 3Played on the kingside: 3Fianchettoed queenside: 3Played on the queenside: 3
Sacrificed material: 7Initiated exchanges: 7Active pieces: 6Kept the bishop pair: 6Space advantage: 6Isolated pawn: 4Backward pawn: 4Missed tactics: 2Played gambits: 1Avoided exchanges: 1
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Openings

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As White 4 games 0W 1D 3L
King's Indian Defense 1 game 0W 0D 1L
Normal Variation 1 game 0W 0D 1L
Rare Defenses 1 game 0W 0D 1L
Queen's Gambit Declined 1 game 0W 1D 0L
Albin Countergambit 1 game 0W 1D 0L
(unspecified) 1 game 0W 1D 0L
Semi-Slav Defense 1 game 0W 0D 1L
Noteboom Variation 1 game 0W 0D 1L
(unspecified) 1 game 0W 0D 1L
Queen's Indian Defense 1 game 0W 0D 1L
Kasparov-Petrosian Variation 1 game 0W 0D 1L
Marco Defense 1 game 0W 0D 1L
As Black 6 games 3W 0D 3L
Pirc Defense 2 games 1W 0D 1L
(unspecified) 2 games 1W 0D 1L
(unspecified) 2 games 1W 0D 1L
Scandinavian Defense 1 game 0W 0D 1L
Main Line 1 game 0W 0D 1L
Mieses Variation 1 game 0W 0D 1L
Grünfeld Defense 1 game 1W 0D 0L
Russian Variation 1 game 1W 0D 0L
(unspecified) 1 game 1W 0D 0L
Nimzo-Larsen Attack 1 game 1W 0D 0L
Classical Variation 1 game 1W 0D 0L
(unspecified) 1 game 1W 0D 0L
Zukertort Opening 1 game 0W 0D 1L
(unspecified) 1 game 0W 0D 1L
(unspecified) 1 game 0W 0D 1L
Blunders Top 4 of 46

This player's costliest moves in analyzed games. Can you find the winning move?

2026.09.27 · 50... fxe4 (−91.2% win chance) 1-0
Costello, John
Kabamwanishi, Mashala
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2026.09.27 · 47... f5 (−81.5% win chance) 1-0
Costello, John
Kabamwanishi, Mashala
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2026.09.27 · 29... Bxd4 (−79.9% win chance) 1-0
Costello, John
Kabamwanishi, Mashala
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2026.09.27 · 26... Rad8 (−69.1% win chance) 1-0
Costello, John
Kabamwanishi, Mashala
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Games Showing all 10 games
Date Event Round Color Opponent Result Accuracy % First moves