IRT ABIERTO 99 ANIVERSARIO CLUB DE AJEDREZ POSADAS

Open SwissStandard

39 players participated in this 6-round tournament, held from 15 Aug 2025 to 17 Aug 2025 in Posadas - Misiones, Argentina. 2 federations represented. Top 10 Elo average was 1882, and top seed was Horacio Oviedo (🇦🇷 ARG, 2070).

Patricio Zaldivar (🇦🇷 ARG, 1970) won with 5.0/6, ahead of Stefan Botz (5.0) and Juan Ignacio Selva Andrade (4.5). Zaldivar shared the lead from round 1, winning on tie-break.

The biggest upset came in round 6: Jose Obieta (1529) beat Alberto Navarro (1795), a +266-point gap.

Location

🇦🇷Posadas - Misiones, Argentina

Dates

15 Aug 2025 → 17 Aug 2025

Time control

Standard: 60 minutes with 30 seconds increment from move 1

System

Swiss · 6 rounds

Top seed

🇦🇷Horacio Oviedo2070

Avg top 10

1,882

Participants

Federations · 2 represented

🇦🇷Argentina×31

🇵🇾Paraguay×2

Top 3

🥇
Patricio Zaldivar
🇦🇷ARG·1970
5.0pts·2609perf+31.0
🥈
Stefan Botz
🇦🇷ARG·1900
5.0pts·2011perf+16.4
🥉
Juan Ignacio Selva Andrade
🇦🇷ARG·1780
4.5pts·1925perf+23.8

How it unfolded

Top 6 · 6 rounds

Tight race until R4; 2 players tied at 5.0/6, decided on Buchholz.

Co-leaders

Zaldivar5Botz5Selva Andrade4.5Coronel4.5Oviedo4.5Carlino4

R4–R6 · LEAD HELD

Patricio Zaldivar held the sole lead from R4 through R6 without losing it.

R6 · TIEBREAK CLUSTER

2 players finish on 5.0/6. Zaldivar takes the title on Buchholz Cut1 (20.0).

WIN STREAKS · 3 top finishers

Patricio Zaldivar 5 wins (R1–R5)Stefan Botz 3 wins (R4–R6)Juan Ignacio Selva Andrade 3 wins (R1–R3)

Key matchups · top 4

Head-to-head between the four finishers

Player	1	2	3	4
1Patricio Zaldivar	*	—	1	—
2Stefan Botz	—	*	0	—
3Juan Ignacio Selva Andrade	0	1	*	½
4Santiago Nicolas Coronel	—	—	½	*

Grille américaine

#	Player	Elo	Fed	R1	R2	R3	R4	R5	R6	Pts	Bu C1	Bu	SB	Perf	Δ
1	Zaldivar, Patricio	1970	ARG	+17N	+7B	+8N	+3B	+5N	F	5.0	20.0	20.0	20.00	2609	+31.0
2	Botz, Stefan	1900	ARG	+24N	+14B	−3N	+13B	+6B	+10N	5.0	19.5	22.0	17.50	2011	+16.4
3	Selva Andrade, Juan Ignacio	1780	ARG	+25B	+16N	+2B	−1N	+11B	=4B	4.5	21.5	23.5	16.25	1925	+23.8
4	Coronel, Santiago Nicolas	1882	ARG	+29B	+10N	−5N	+9B	+15B	=3N	4.5	20.0	22.0	15.25	1957	+12.8
5	Oviedo, Horacio	2070	ARG	+28B	+15N	+4B	=6N	−1B	+12N	4.5	20.0	22.0	15.00	2041	-2.0
6	Alvarez, Jesus Esteban	1934	ARG	+11B	+9N	+12B	=5B	−2N	=7B	4.0	21.5	25.0	15.75	1937	+5.2
7	Duba, Yamil	1763	PAR	+39B	−1N	+16B	+18N	=12B	=6N	4.0	18.5	18.5	9.75	1854	+9.6
8	Carlino, Esteban	1859	ARG	+33B	+19N	−1B	−10N	+16B	+23N	4.0	17.5	19.0	10.00	1809	-5.0
9	Leith Acosta, Marcelo Alejandro	1741	PAR	+27B	−6B	+20N	−4N	+36B	+15N	4.0	16.5	17.5	9.00	1766	+6.4
10	Owczarczyn, Cristian Lucas	1733	ARG	+37N	−4B	+38N	+8B	+22N	−2B	4.0	16.0	16.0	6.50	1859	+13.6
11	Obieta, Jose	1529	ARG	−6N	+37B	+26N	+33B	−3N	+22B	4.0	14.5	14.5	6.00	1798	+65.2
12	Alvarez, Miguel	1865	ARG	+36N	+26B	−6N	+14B	=7N	−5B	3.5	18.0	19.0	8.50	1828	-3.0
13	Fernandez, Gabriel	1753	ARG	−18N	+31B	+24N	−2N	+17B	=14B	3.5	17.0	19.0	9.25	1766	+2.0
14	Rozental, Sasha Valentin	1714	ARG	+34B	−2N	+28B	−12N	+25B	=13N	3.5	16.0	17.0	6.75	1719	+0.8
15	Portillo, Luciana	1765	ARG	+31N	−5B	+17N	+23B	−4N	−9B	3.0	18.5	20.5	7.50	1698	-20.4
16	Maxit, Alfredo Javier	1646	ARG	+21N	−3B	−7N	+38B	−8N	+31B	3.0	17.5	17.5	5.00	1001	-17.8
17	Sonaridio, Santiago	1545	ARG	−1B	+27N	−15B	+34N	−13N	+32B	3.0	15.5	16.5	5.00	1026	-22.4
18	Gross, Thiago Sthefano	0	ARG	+13B	=23N	=22N	−7B	−30N	+26B	3.0	14.5	16.5	8.00	1712	0.0
19	Molina Lopez, Martin Ignacio	1703	ARG	+35N	−8B	+21N	−22B	−23N	+25B	3.0	14.0	15.0	6.00	1485	-42.8
20	Duarte, Olivia	1464	ARG	−22B	+32N	−9B	−30B	+35N	+27N	3.0	12.5	13.5	5.00	946	0.0
21	Recio, Fernando Javier	0	ARG	−16B	+25N	−19B	+29N	−28N	+33B	3.0	12.0	13.5	5.50	1562	0.0
22	Navarro, Alberto	1795	ARG	+20N	F	=18B	+19N	−10B	−11N	2.5	17.0	17.0	7.50	1528	-21.0
23	Silva, Juan Carlos	1596	ARG	F	=18B	+30N	−15N	+19B	−8B	2.5	15.0	15.0	6.50	1756	+16.4
24	Duarte, Junior Oscar	1511	ARG	−2B	+34N	−13B	=27N	−29B	+38N	2.5	13.5	13.5	2.00	915	-32.8
25	Esposito, Santino	1438	ARG	−3N	−21B	+37N	+26B	−14N	−19N	2.0	16.0	16.0	2.00	1521	+9.2
26	Sonaridio, Juan Ignacio	1659	ARG	+32B	−12N	−11B	−25N	+34B	−18N	2.0	14.5	15.5	3.00	819	-67.2
27	Horrisberger, Martina	0	ARG	−9N	−17B	+35N	=24B	=33N	−20B	2.0	14.0	15.0	3.00	1374	0.0
28	Tevez, Maximiliano Alexander	1615	ARG	−5N	+39B	−14N	F	+21B	F	2.0	13.0	13.0	3.00	1066	-17.6
29	Oliveira, Enzo Fabricio	1492	ARG	−4N	+35B	−33N	−21B	+24N	F	2.0	12.5	12.5	3.50	1492	-4.4
30	Kuhle, Ernesto	1703	ARG	F	F	−23B	+20N	+18B	F	2.0	10.5	10.5	6.00	797	-25.6
31	FIDE 20068018	0	—	−15B	−13N	−34B	+37N	+39B	−16N	2.0	10.5	10.5	0.00	922	0.0
32	FIDE 20055633	0	—	−26N	−20B	+39N	−36B	+38N	−17N	2.0	9.0	9.0	0.00	768	0.0
33	Dutra, Omar Horacio	1480	ARG	−8N	F	+29B	−11N	=27B	−21N	1.5	15.0	15.0	3.00	1502	+1.4
34	Levy, Ariel Edgardo	0	ARG	−14N	−24B	+31N	−17B	−26N	F	1.0	13.0	14.0	2.00	812	0.0
35	FIDE 20068042	0	—	−19B	−29N	−27B	+39N	−20B	F	1.0	11.0	11.0	0.00	794	0.0
36	Paz, Roque Pablo	1484	ARG	−12B	F	F	+32N	−9N	F	1.0	9.5	9.5	2.00	1003	-10.8
37	FIDE 20055919	0	—	−10B	−11N	−25B	−31B	F	F	0.0	12.0	12.0	0.00	775	0.0
38	FIDE 20065353	0	—	F	F	−10B	−16N	−32B	−24B	0.0	11.5	11.5	0.00	830	0.0
39	FIDE 20068026	0	—	−7N	−28N	−32B	−35B	−31N	F	0.0	11.0	11.0	0.00	890	0.0

Key insights

Biggest movers and upsets — the story behind the numbers.

Top rating gainers

1Obieta, JoseARG
+65.2
4.0 pts · #9
2Zaldivar, PatricioARG
+31.0
5.0 pts · #1
3Selva Andrade, Juan IgnacioARG
+23.8
4.5 pts · #3

Top rating losers

1Sonaridio, Juan IgnacioARG
-67.2
2.0 pts · #37
2Molina Lopez, Martin IgnacioARG
-42.8
3.0 pts · #24
3Duarte, Junior OscarARG
-32.8
2.5 pts · #25

Biggest upsets

R6+266 Elo gap
Obieta, Jose1529 beat Navarro, Alberto1795
R4+221 Elo gap
Esposito, Santino1438 beat Sonaridio, Juan Ignacio1659
R3+130 Elo gap
Obieta, Jose1529 beat Sonaridio, Juan Ignacio1659