CMRuben Abraham Ulloa Castillo
PAN · FIDE ID 6601243 · 31 tournament games since 2024
Standard
2149
#8 in PAN (active)
Rapid
2131
#8 in PAN (active)
Blitz
2087
#14 in PAN (active)
Score
47%
12 W · 5 D · 14 L
Opp. avg
2138
Last 31 games
Last game
2026-09-25
46th FIDE Chess Olympiad Samarkand 2026 | Open | Matches 38-62
Prep summary
- As White: 1.d4 in 67% of games (scores 45%), otherwise 1.Nf3 (20%).
- Against 1.e4: 1...e5 in 4 of 6 games (King's Pawn Game), scoring 38%.
- Against 1.d4: 1...d5 in 3 of 4 games (Queen's Pawn Game), scoring 33%.
- By opponent strength: 18% against higher-rated players, 80% against lower-rated.
Based on 31 over-the-board games (12 classical · 5 blitz). 15 with White (53%), 16 with Black (41%).
Openings as White
First move
| 1.d4 | 10 | 45% |
| 1.Nf3 | 3 | 100% |
| 1.e4 | 2 | 25% |
Most played
| Opening | Games | Score |
|---|---|---|
| Slav Defense: Exchange Variation | 2 | 100% |
| Torre Attack: Fianchetto Defense | 1 | 0% |
| Indian Defense: Wade-Tartakower Defense | 1 | 100% |
| Torre Attack: Classical Defense, Nimzowitsch Variation | 1 | 0% |
| Benoni Defense: Benoni-Indian Defense, Kingside Move Order | 1 | 0% |
Openings as Black
Against 1.e4 (6 games)
| 1...e5 King's Pawn Game | 4 | 38% |
| 1...d5 Scandinavian Defense | 2 | 50% |
Against 1.d4 (4 games)
| 1...d5 Queen's Pawn Game | 3 | 33% |
| 1...Nf6 Indian Defense | 1 | 50% |
Most played
| Opening | Games | Score |
|---|---|---|
| Slav Defense: Alekhine Variation | 1 | 0% |
| Réti Opening: Anglo-Slav Variation, New York System | 1 | 0% |
| Slav Defense | 1 | 0% |
| Italian Game: Giuoco Pianissimo, Italian Four Knights Variation | 1 | 100% |
| King's Indian Attack: Keres Variation | 1 | 0% |
Recent games
| Date | Opponent and event | Result |
|---|---|---|
| 2026-09-25 | Vitalis Mapuranga (2058) 46th FIDE Chess Olympiad Samarkand 2026 | Open | Matches 38-62 | L |
| 2026-09-24 | Arben Dardha (2229) 46th FIDE Chess Olympiad Samarkand 2026 | Open | Matches 13-37 | L |
| 2026-09-21 | Ganzorig Amartuvshin (2445) 46th FIDE Chess Olympiad Samarkand 2026 | Open | Matches 13-37 | L |
| 2026-09-19 | Nayaka Budhidharma (2383) 46th FIDE Chess Olympiad Samarkand 2026 | Open | Matches 13-37 | L |
| 2026-09-18 | Ethan Tjin Kon Kiem (1828) 46th FIDE Chess Olympiad Samarkand 2026 | Open | Matches 63-87 | W |
| 2026-09-17 | Artiom Stribuk (2489) 46th FIDE Chess Olympiad Samarkand 2026 | Open | Matches 38-62 | L |
| 2026-09-16 | Marc Delrieu (1564) 46th FIDE Chess Olympiad Samarkand 2026 | Open | Matches 88+ | W |
| 2026-08-30 | Christopher Lezcano Martinez (1964) V Panama Chess Open 2026 · classical | ½ |
| 2026-08-29 | Fernando Miguel Fernandez Sanchez (2371) V Panama Chess Open 2026 · classical | L |
| 2026-08-29 | Ermes Espinosa Veloz (2468) V Panama Chess Open 2026 · classical | 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.