Olimpiada Nacional 2026. Region II. Sub 20 Var
10 players participated in this 5-round tournament, held from 18 Mar 2026 to 20 Mar 2026 in ZAC, Zacatecas, Mexico. 1 titled players. Top 10 Elo average was 1859, and top seed was Alejandro Francisco Flores Teillery (🇲🇽 MEX, CM, 1977).
Ernesto Mendoza Osorio (🇲🇽 MEX, 1826) won with 3.5/5, ahead of Luis Alberto Acuna Ramirez (3.5) and David Del Valle Uribe (3.0). Mendoza Osorio won on tie-break after catching the field in the final round.
The biggest upset came in round 3: Ernesto Mendoza Osorio (1826) beat Sebastian Alonso Calixto Perea (1975), a +149-point gap.
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How it unfolded
Top 6 · 5 roundsTight race until R2; 2 players tied at 3.5/5, decided on Buchholz.
Luis Alberto Acuna Ramirez held the sole lead from R2 through R5 without losing it.
2 players finish on 3.5/5. Mendoza Osorio takes the title on Buchholz Cut1 (11.5).
Luis Alberto Acuna Ramirez went unbeaten across 5 games (R1–R5).
Key matchups · top 4
Head-to-head between the four finishers| Player | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| 1Luis Alberto Acuna Ramirez | * | — | ½ | ½ |
| 2Ernesto Mendoza Osorio | — | * | 0 | 1 |
| 3David Del Valle Uribe | ½ | 1 | * | — |
| 4Sebastian Alonso Calixto Perea | ½ | 0 | — | * |
Grille américaine
| # | Player | Elo | Fed | R1 | R2 | R3 | R4 | R5 | Pts | Bu C1 | Bu | SB | Perf | Δ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Mendoza Osorio, Ernesto | 1826 | MEX | −3N | +9B | +5B | =6N | +7B | 3.5 | 11.5 | 12.5 | 8.00 | 2013 | +25.0 |
| 2 | Acuna Ramirez, Luis Alberto | 1923 | MEX | +9N | +8B | =3N | =4B | =5N | 3.5 | 11.0 | 12.0 | 7.50 | 2032 | +14.8 |
| 3 | Del Valle Uribe, David | 1905 | MEX | +1B | =6N | =2B | =7N | =4B | 3.0 | 13.0 | 15.5 | 9.50 | 1960 | +8.0 |
| 4 | Briceno Campos, Angel Gabriel | 1967 | MEX | +7B | =5N | =6B | =2N | =3N | 3.0 | 12.5 | 15.0 | 8.75 | 1977 | +3.6 |
| 5 | Calixto Perea, Sebastian Alonso | 1975 | MEX | +8N | =4B | −1N | +10N | =2B | 3.0 | 12.0 | 12.5 | 5.75 | 1926 | -5.6 |
| 6 | Flores Teillery, Alejandro FranciscoCM | 1977 | MEX | +10N | =3B | =4N | =1B | =8N | 3.0 | 11.5 | 12.0 | 6.25 | 1922 | -6.2 |
| 7 | Juarez Garcia, Abelardo | 1747 | MEX | −4N | +10B | +9N | =3B | −1N | 2.5 | 10.5 | 11.0 | 3.00 | 1823 | +10.0 |
| 8 | Lopez Nava, Luis Enrique | 1852 | MEX | −5B | −2N | +10B | =9N | =6B | 2.0 | 10.5 | 11.0 | 2.50 | 1787 | -17.6 |
| 9 | Mascorro Puente, Angel Antonio | 1716 | MEX | −2B | −1N | −7B | =8B | =10N | 1.0 | 11.5 | 12.0 | 1.25 | 1570 | -35.6 |
| 10 | Franco Rivero, Santiago | 1701 | MEX | −6B | −7N | −8N | −5B | =9B | 0.5 | 10.5 | 11.5 | 0.50 | 1487 | -42.4 |
Key insights
Biggest movers and upsets — the story behind the numbers.
- 1Mendoza Osorio, ErnestoMEX+25.03.5 pts · #2
- 2Acuna Ramirez, Luis AlbertoMEX+14.83.5 pts · #1
- 3Juarez Garcia, AbelardoMEX+10.02.5 pts · #7
- 1Franco Rivero, SantiagoMEX-42.40.5 pts · #10
- 2Mascorro Puente, Angel AntonioMEX-35.61.0 pts · #9
- 3Lopez Nava, Luis EnriqueMEX-17.62.0 pts · #8
- R3+149 Elo gap