Prepare against Sergio Alonso
Argentina · World #65,600 classical · FIDE ID 172448
When preparing against Sergio Alonso, expect 1.e4 in 91% of White games. Against 1.e4 the reply is 1...e5 (83% of games); against 1.d4, 1...d5 (88%).
Our database contains 47 games by Sergio Alonso, covering Jul 2009 to Jul 2026. Below you'll find Sergio Alonso's most-played openings with White and Black, career performance record, notable wins and top events — everything you need to scout Sergio Alonso before a game. You can open the same data in the free interactive preparation workstation, which builds a move-by-move opening tree from every game.
Ratings
| Time control | Current | Peak | Peak date |
|---|---|---|---|
| Classical | 1,836 | 1,837 | May 2026 |
| Rapid | 1,835 | 1,837 | Sep 2025 |
| Blitz | 1,789 | 1,797 | Sep 2025 |
Performance record
| Split | Games | Wins | Draws | Losses | Win rate |
|---|---|---|---|---|---|
| Overall | 47 | 15 | 11 | 21 | 31.9% |
| As White | 23 | 9 | 8 | 6 | 39.1% |
| As Black | 24 | 6 | 3 | 15 | 25.0% |
Move-by-move preparation stats
Straight from the preparation tree built over all of Sergio Alonso's games — the same tree the interactive prep board lets you walk to any depth. Scores are from Sergio Alonso's side.
First moves as White (23 games)
| Move | Games | Share | Player score |
|---|---|---|---|
| e4 | 21 | 91.3% | 52.4% |
| f4 | 2 | 8.7% | 100.0% |
Main lines as White
- 1.e4 — 91% of White games, 52.4% score
- …c5 (43% of these games) — Alonso usually continues Nf3 (61.1% score)
- …e6 (19% of these games) — Alonso usually continues d4 (75.0% score)
- …e5 (19% of these games) — Alonso usually continues Nf3 (25.0% score)
- 1.f4 — 9% of White games, 100.0% score
- …Nf6 (50% of these games) — Alonso usually continues Nf3 (100.0% score)
- …e6 (50% of these games) — Alonso usually continues e4 (100.0% score)
As Black against 1.e4 (12 games)
| Move | Games | Share | Player score |
|---|---|---|---|
| e5 | 10 | 83.3% | 20.0% |
| g6 | 2 | 16.7% | 50.0% |
As Black against 1.d4 (8 games)
| Move | Games | Share | Player score |
|---|---|---|---|
| d5 | 7 | 87.5% | 50.0% |
| Nf6 | 1 | 12.5% | 50.0% |
Sergio Alonso's chess games
All 47 games by Sergio Alonso in the Chess.ceo database (Jul 2009 - Jul 2026) are free to browse, search and replay: filter by opening, opponent, event or date on the player page, or step through any game on the analysis board. Record: 15 wins, 11 draws, 21 losses.
Openings as White
| ECO | Opening | Games | W/D/L | Win rate |
|---|---|---|---|---|
| B30 | Sicilian: Rossolimo | 3 | 0/2/1 | 0.0% |
| B90 | Sicilian: Najdorf | 3 | 2/0/1 | 66.7% |
| C02 | French: Advance Variation | 2 | 1/1/0 | 50.0% |
| A03 | Bird's opening | 2 | 2/0/0 | 100.0% |
| C27 | Bishop's Opening | 2 | 0/0/2 | 0.0% |
| B28 | Sicilian | 2 | 1/1/0 | 50.0% |
| A54 | Nimzowitsch Defense: Kennedy Variation | 1 | 0/1/0 | 0.0% |
| A53 | Pirc Defense | 1 | 1/0/0 | 100.0% |
| C65 | Ruy Lopez: Berlin Defense | 1 | 0/0/1 | 0.0% |
| C77 | Ruy Lopez: Steinitz Defense Deferred | 1 | 0/1/0 | 0.0% |
Openings as Black
| ECO | Opening | Games | W/D/L | Win rate |
|---|---|---|---|---|
| C60 | Ruy Lopez | 5 | 1/0/4 | 20.0% |
| A26 | Modern Defense | 3 | 1/0/2 | 33.3% |
| C45 | Scotch Game | 2 | 0/0/2 | 0.0% |
| D02 | London System | 2 | 1/0/1 | 50.0% |
| D07 | Queen's Gambit | 2 | 1/0/1 | 50.0% |
| D02 | Queen's Pawn Game | 2 | 1/0/1 | 50.0% |
| C68 | Ruy Lopez: Exchange | 1 | 0/0/1 | 0.0% |
| E69 | English Opening | 1 | 0/0/1 | 0.0% |
| C83 | Ruy Lopez: Open | 1 | 0/0/1 | 0.0% |
| D08 | Albin Countergambit | 1 | 0/1/0 | 0.0% |
Notable wins
| Date | Opponent | Elo | Event | ECO |
|---|---|---|---|---|
| Jun 2013 | Agustin Baltazar Pernas | 1,888 | 3rd Buenos Aires Duchamp Boca Open | A53 |
| Jul 2020 | Jose Antonio Carrillo | 1,787 | 20th Rio Grande Domingo Open | B75 |
| Jul 2020 | Carrizo,Victor | 1,583 | 20th Rio Grande Domingo Open | B40 |
| Jun 2013 | Franco Enciso | 1,569 | 3rd Buenos Aires Duchamp Boca Open | D07 |
| Oct 2016 | Elana Silva De Souza | 1,532 | ch-Pan American U1700 | A03 |
Top events
| Event | Year | Games | Score | TPR |
|---|---|---|---|---|
| 20th Rio Grande Domingo Open | 2020 | 10 | 3 | 1,581 |
| 3rd Buenos Aires Duchamp Boca Open | 2013 | 9 | 4 | 1,833 |
| ch-Pan American U1700 | 2016 | 9 | 5.5 | 1,627 |
| 4th Buenos Aires Duchamp Memorial Open | 2012 | 8 | 2.5 | 1,699 |
| 73rd Villa Ballester Open | 2024 | 7 | 3.5 | 1,576 |
| Buenos Aires Carnival Open | 2023 | 1 | 0.5 | 2,168 |
| Buenos Aires Legislativo U2000 | 2017 | 1 | 1 | – |
| Buenos Aires Torre Blanca U2400 Open | 2023 | 1 | 0.5 | 1,813 |
Interactive opening tree from all 47 games, weak-spot detection and engine analysis.
Start preparationFrequently asked questions
Where can I find Sergio Alonso's chess games?
47 games by Sergio Alonso, from Jul 2009 to Jul 2026, are free to browse and replay move by move — no signup needed. The preparation view groups them into an opening tree showing every line Sergio Alonso has played.
What does Sergio Alonso play on the first move as White?
Across 23 games with White in our database, Sergio Alonso opens with 1.e4 (91% of games), 1.f4 (9% of games). Against 1.e4 as Black, Sergio Alonso answers 1...e5 (83% of games), 1...g6 (17% of games). Against 1.d4: 1...d5 (88% of games), 1...Nf6 (13% of games).
What openings does Sergio Alonso play as White?
As White, Sergio Alonso's most-played openings in our database are: Sicilian: Rossolimo (3 games, 0.0% win rate); Sicilian: Najdorf (3 games, 66.7% win rate); French: Advance Variation (2 games, 50.0% win rate). The full breakdown of 23 games with White is in the table above.
What openings does Sergio Alonso play as Black?
As Black, Sergio Alonso most often plays: Ruy Lopez (5 games, 20.0% win rate); Modern Defense (3 games, 33.3% win rate); Scotch Game (2 games, 0.0% win rate). See the table above for the top ten Black openings across 24 games.
What is Sergio Alonso's FIDE rating?
Sergio Alonso is currently rated 1,836 in classical chess, 1,835 in rapid and 1,789 in blitz. Peak classical rating: 1,837 (May 2026).
How many games has Sergio Alonso played?
Our database contains 47 games by Sergio Alonso, covering Jul 2009 to Jul 2026. Overall record: 15 wins, 11 draws, 21 losses (31.9% win rate).
How do I prepare against Sergio Alonso?
47 games by Sergio Alonso reveal their opening repertoire, most-played lines, and the variations where they score worst — the raw material for targeted preparation. The interactive opening tree lets you walk every line to any depth.