Format
UC
Ulloa Castillo, Ruben Abraham
CM🇵🇦FIDE 6601243· Male· Panama· Born in 1995
Follow Ruben Abraham Ulloa CastilloTrack his monthly FIDE ratings, games, tournaments and more.
Ruben Abraham Ulloa Castillo, a 31-year-old Candidate Master, is rated 2176 and ranked 6th among PAN players, and in the top 4% worldwide. He is on a steady climb with +30 Elo over the past 12 months. 21 rated games in the past year (≈31/year long-term). Recent standard appearances include Campeonato Nacional ABSOLUTO Panama 2026, XII Juegos Centroamericanos Guatemala 2025-Masculino, and Campeonato Nacional ABSOLUTO Panama 2025. Also played 1 rapid (including Campeonato Nacional Rapid 2025 - Absoluto) and 3 blitz events (including XII Juegos Centroamericanos Guatemala 2025 Blitz-Masculino) recently. He took a 21-month break between Feb 2022 and Dec 2023. His peak of 2238 was reached at age 23 (Apr 2018); he also reached #3 nationally in Jan 2018 and spent 21 months in top 5.
Previously known as Ruben Guillermo Flores C. (until Sep 2014). Awarded CM in 2017 (age 22). At junior level, he reached #1 and #2 nationally in U20 and U18.
Current rating
2176
Standard
Rpd2131·Blz2087
All-time high
2238
−62 pts below
Apr 2018 · age 23
Apr 2018 · age 23
Activity
18
games / yr avg. · ≈2/mo
21 past 12 mo · ≈2/mo
classical only
Moderately active
classical only
Moderately active
Signature stat
#6
#6 · PAN players · of 310
21 months in National top 5 (2017–2021)
21 months in National top 5 (2017–2021)
Career timeline
19 entries2022
Inactive for 21 months
paused at 2150 → returned at 2132
Feb 2022
2021
21 months in national top 5
longest streak 17 months · since Jun 2017
Dec 2021
2019
Re-crossed 2200
at age 24
Nov 2019
2018
All-time peak 2238
at age 23 · −62 from today
Apr 2018
Peak national rank: #3
at age 23 · rated 2222
Jan 2018
2017
Crossed 2200
at age 22
Jul 2017
Standard rating history
Activity & highlights
Top opponent
Evolution
+30
2146 → 2176
Tournaments
3
21 games
Score
15/ 2171.4%
14W2D5L
Top 3 wins
3.[W]vsAlcides Ivan Meza MartInezCM2,061·XII Juegos Centroamericanos Guatemala 2025-Masculino·R2·+7.6
Top 3 losses
Last 12 months — tournaments
3 events| Event | Date | Score | Rank | Perf | Δ Elo |
|---|---|---|---|---|---|
Open Swiss | Jan 2026 | 7/9 | #2 | 2246 | +29.8 |
Team | Oct 2025 | 2/3 | #17 | 2186 | +4.0 |
Open Swiss | Jun 2025 | 6/9 | #5 | 2101 | -3.8 |
Most-Played Opponents
vsOrlando Andres Leon ArchibaldoFM
🇵🇦PAN·2186
+12 −20 =5
37 games·last met Nov 2025
View head-to-head →
vsJorge Luis Baules RodriguezIM
🇵🇦PAN·2283
+1 −15 =7
23 games·last met Jan 2026
View head-to-head →
vsAlexei Tapia OstolazaFM
🇵🇦PAN·2188
+3 −5 =12
20 games·last met Jan 2026
View head-to-head →
vsPatrick Emilio AizpuruaFM
🇵🇦PAN·2313
+3 −12 =5
20 games·last met Feb 2020
View head-to-head →
vsJorge Luis Sanchez ManzanaresFM
🇵🇦PAN·1983
+9 −3 =6
18 games·last met Nov 2025
View head-to-head →
Rankings
/
Panama
#6
out of 451 players
Americas
#1,027
in continent
World
#9,512
out of 400,000+
National ranking
Europe & World
Europe
World
Panama
| 1 | 🇵🇦Follow Roberto Carlos Sanchez AlvarezTrack their monthly FIDE ratings, games, tournaments and more. | 2,344 |
| 2 | 🇵🇦Follow Jorge Luis Baules RodriguezTrack their monthly FIDE ratings, games, tournaments and more. | 2,283 |
| 3 | 🇵🇦Follow Alexei Tapia OstolazaTrack their monthly FIDE ratings, games, tournaments and more. | 2,188 |
| 4 | 🇵🇦Follow Orlando Andres Leon ArchibaldoTrack their monthly FIDE ratings, games, tournaments and more. | 2,186 |
| 5 | 🇵🇦Follow Andre Mendez MachadoTrack their monthly FIDE ratings, games, tournaments and more. | 2,183 |
| 6 | 2,176 | |
| 7 | 🇵🇦Follow Efren Andres Ramos EspinozaTrack their monthly FIDE ratings, games, tournaments and more. | 2,155 |
| 8 | 🇵🇦Follow Adrian Alonso Fuentes ManriqueTrack their monthly FIDE ratings, games, tournaments and more. | 2,121 |
| 9 | 🇵🇦Follow Ashley Alexandra Castillo BeitiaTrack their monthly FIDE ratings, games, tournaments and more. | 2,119 |
| 10 | 🇵🇦Follow Jose Miguel Battikh KenaanTrack their monthly FIDE ratings, games, tournaments and more. | 2,106 |
Americas
| 1 | 🇺🇸Follow Hikaru NakamuraTrack their monthly FIDE ratings, games, tournaments and more. | 2,792 |
| 2 | 🇺🇸Follow Fabiano CaruanaTrack their monthly FIDE ratings, games, tournaments and more. | 2,788 |
| 3 | 🇺🇸Follow Wesley SoTrack their monthly FIDE ratings, games, tournaments and more. | 2,754 |
| 4 | 🇺🇸Follow Leinier Dominguez PerezTrack their monthly FIDE ratings, games, tournaments and more. | 2,732 |
| 5 | 🇺🇸Follow Hans Moke NiemannTrack their monthly FIDE ratings, games, tournaments and more. | 2,728 |
| 6 | 🇺🇸Follow Levon AronianTrack their monthly FIDE ratings, games, tournaments and more. | 2,724 |
| 7 | 🇺🇸Follow Awonder LiangTrack their monthly FIDE ratings, games, tournaments and more. | 2,718 |
| 8 | 🇺🇸Follow Samuel SevianTrack their monthly FIDE ratings, games, tournaments and more. | 2,696 |
| 9 | 🇺🇸Follow Jeffery XiongTrack their monthly FIDE ratings, games, tournaments and more. | 2,656 |
| 10 | 🇺🇸Follow Ray RobsonTrack their monthly FIDE ratings, games, tournaments and more. | 2,653 |
| ... | ||
| 1027 | 2,176 | |
World
| 1 | 🇳🇴Follow Magnus CarlsenTrack their monthly FIDE ratings, games, tournaments and more. | 2,840 |
| 2 | 🇺🇸Follow Hikaru NakamuraTrack their monthly FIDE ratings, games, tournaments and more. | 2,792 |
| 3 | 🇺🇸Follow Fabiano CaruanaTrack their monthly FIDE ratings, games, tournaments and more. | 2,788 |
| 4 | 🇺🇿Follow Nodirbek AbdusattorovTrack their monthly FIDE ratings, games, tournaments and more. | 2,780 |
| 5 | 🇺🇿Follow Javokhir SindarovTrack their monthly FIDE ratings, games, tournaments and more. | 2,776 |
| 6 | 🇳🇱Follow Anish GiriTrack their monthly FIDE ratings, games, tournaments and more. | 2,767 |
| 7 | 🇩🇪Follow Vincent KeymerTrack their monthly FIDE ratings, games, tournaments and more. | 2,759 |
| 7 | 🇫🇷Follow Alireza FirouzjaTrack their monthly FIDE ratings, games, tournaments and more. | 2,759 |
| 9 | 🇺🇸Follow Wesley SoTrack their monthly FIDE ratings, games, tournaments and more. | 2,754 |
| 10 | 🇨🇳Follow Yi WeiTrack their monthly FIDE ratings, games, tournaments and more. | 2,753 |
| ... | ||
| 9512 | 2,176 | |