Torneo de segunda categoria - El Mundo del Ajedrez 2025
11 players participated in this 5-round tournament, held from 01 Nov 2025 to 02 Nov 2025 in Comodoro Rivadavia, Chubut, Argentina. Top 10 Elo average was 1526, and top seed was Carlos Moreno (🇦🇷 ARG, 1947).
Adrian Hernan Muruchi Machaca (🇦🇷 ARG, 1871) won with 4.5/5, ahead of Marcelo Anacaya (3.5) and Ricardo Pettinari (3.5). Muruchi Machaca took the lead from round 4.
The biggest upset came in round 1: Osmar Marquina (1458) beat Sergio Alonso (1754), a +296-point gap.
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How it unfolded
Top 6 · 5 roundsAdrian Hernan Muruchi Machaca led from R4; +1.0-point edge over the runner-up.
Adrian Hernan Muruchi Machaca takes the sole lead (3.5/4).
Adrian Hernan Muruchi Machaca beat Ricardo Pettinari (White).
Ricardo Pettinari won 3 in a row (R1–R3).
Key matchups · top 4
Head-to-head between the four finishers| Player | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| 1Adrian Hernan Muruchi Machaca | * | 1 | ½ | — |
| 2Ricardo Pettinari | 0 | * | ½ | — |
| 3Marcelo Anacaya | ½ | ½ | * | ½ |
| 4Sergio Alonso | — | — | ½ | * |
Grille américaine
| # | Player | Elo | Fed | R1 | R2 | R3 | R4 | R5 | Pts | Bu C1 | Bu | SB | Perf | Δ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Muruchi Machaca, Adrian Hernan | 1871 | ARG | +6N | +8B | =2N | +3B | +5N | 4.5 | 12.0 | 13.0 | 11.25 | 2068 | +41.2 |
| 2 | Anacaya, Marcelo | 1812 | ARG | +7B | +9N | =1B | =4N | =3N | 3.5 | 13.5 | 13.5 | 7.75 | 1806 | -0.2 |
| 3 | Pettinari, Ricardo | 1688 | ARG | +10B | +5B | +7N | −1N | =2B | 3.5 | 13.0 | 13.0 | 6.75 | 1885 | +40.8 |
| 4 | Alonso, Sergio | 1754 | ARG | −8N | +6B | +10N | =2B | +9N | 3.5 | 6.5 | 6.5 | 3.75 | 1621 | -9.6 |
| 5 | Moreno, Carlos | 1947 | ARG | +11B | −3N | +9B | +8N | −1B | 3.0 | 9.0 | 9.0 | 1.00 | 1679 | -24.4 |
| 6 | Zalaya, Ivo | 1594 | ARG | −1B | −4N | F | +10B | +8N | 2.0 | 9.0 | 9.0 | 1.00 | 1569 | -5.6 |
| 7 | Muruchi Machaca, Sol Angeles | 1529 | ARG | −2N | +11N | −3B | +9B | F | 2.0 | 7.0 | 7.0 | 0.00 | 1578 | +6.4 |
| 8 | Marquina, Osmar | 1458 | ARG | +4B | −1N | F | −5B | −6B | 1.0 | 13.0 | 13.0 | 3.50 | 1573 | +14.8 |
| 9 | FIDE 20067844 | 0 | — | F | −2B | −5N | −7N | −4B | 0.0 | 12.0 | 12.0 | 0.00 | 961 | 0.0 |
| 10 | FIDE 20072848 | 0 | — | −3N | F | −4B | −6N | F | 0.0 | 9.0 | 9.0 | 0.00 | 879 | 0.0 |
| 11 | Velardez, Felipe | 1610 | ARG | −5N | −7B | F | F | F | 0.0 | 6.0 | 6.0 | 0.00 | 938 | -29.2 |
Key insights
Biggest movers and upsets — the story behind the numbers.
- 1Muruchi Machaca, Adrian HernanARG+41.24.5 pts · #1
- 2Pettinari, RicardoARG+40.83.5 pts · #2
- 3Marquina, OsmarARG+14.81.0 pts · #8
- 1Velardez, FelipeARG-29.20.0 pts · #11
- 2Moreno, CarlosARG-24.43.0 pts · #4
- 3Alonso, SergioARG-9.63.5 pts · #5
- R1+296 Elo gap
- R2+259 Elo gap