Abierto Internacional del Valle Medio - Rio Negro

SwissStandard

88 players participated in this 7-round tournament, held from 21 Nov 2025 to 24 Nov 2025 in Choele Choel, Rio Negro, Argentina. 9 titled players from 4 federations. Top 10 Elo average was 2293, and top seed was Sandro Mareco (🇦🇷 ARG, GM, 2568).

Sandro Mareco (🇦🇷 ARG, GM, 2568) won with 6.0/7, ahead of Lucas Liascovich (6.0) and Pablo Ismael Acosta (5.5). Mareco shared the lead from round 1, winning on tie-break.

The biggest upset came in round 1: Carlos Meineri (1606) beat Daniel Pacheco (FM, 2208), a +602-point gap.

Location

🇦🇷Choele Choel, Rio Negro, Argentina

Dates

21 Nov 2025 → 24 Nov 2025

Time control

Standard: 90 minutes with 30 second increment from move 1

System

Swiss · 7 rounds

Top seed

🇦🇷GMSandro Mareco2568

Avg top 10

2,293

Participants

Titled players · 9

GM×1

IM×6

FM×1

CM×1

Federations · 4 represented

🇦🇷Argentina×78

🇺🇾Uruguay×1

🇮🇹Italy×1

🇨🇱Chile×1

Top 3

🥇
GMSandro Mareco
🇦🇷ARG·2568
6.0pts·2541perf-0.4
🥈
IMLucas Liascovich
🇦🇷ARG·2395
6.0pts·2432perf+4.3
🥉
IMPablo Ismael Acosta
🇦🇷ARG·2501
5.5pts·2472perf+0.1

How it unfolded

Top 6 · 7 rounds

Tight race until R6; 2 players tied at 6.0/7, decided on Buchholz. Title race narrowed from 3 co-leaders at R4 to 2 at the finish.

Co-leaders

Mareco6Liascovich6Villordo5.5Llanos5.5Mavrich5.5Acosta5.5

R6–R7 · LEAD HELD

GM Sandro Mareco held the sole lead from R6 through R7 without losing it.

R7 · TIEBREAK CLUSTER

2 players finish on 6.0/7. Mareco takes the title on Buchholz Cut1 (31.0).

WIN STREAKS · 2 top finishers

GM Sandro Mareco 4 wins (R1–R4)Matias Villordo 3 wins (R5–R7)

Key matchups · top 4

Head-to-head between the four finishers

Player	1	2	3	4
1GMSandro Mareco	*	—	—	½
2IMLucas Liascovich	—	*	½	—
3Matias Villordo	—	½	*	—
4IMGuillermo Llanos	½	—	—	*

Grille américaine

#	Player	Elo	Fed	R1	R2	R3	R4	R5	R6	R7	Pts	Bu C1	Bu	SB	Perf	Δ
1	Mareco, SandroGM	2568	ARG	+54N	+8B	+10N	+14B	=3N	+5B	=4N	6.0	31.0	34.0	28.50	2541	-0.4
2	Liascovich, LucasIM	2395	ARG	+51N	+22B	=6N	+13B	+15N	=3B	+12N	6.0	29.5	32.5	27.00	2432	+4.3
3	Acosta, Pablo IsmaelIM	2501	ARG	+27B	+21N	+9B	+16N	=1B	=2N	=7B	5.5	31.5	35.5	26.75	2472	+0.1
4	Llanos, GuillermoIM	2250	ARG	+30B	+11N	+17B	−25N	+10B	+14N	=1B	5.5	29.0	33.0	26.00	2277	+4.3
5	Crespo, Eugenio	2198	ARG	+39N	+28B	=15N	+6B	+25B	−1N	+17B	5.5	28.5	32.0	23.75	2223	+6.8
6	Villordo, Matias	2011	ARG	+70B	+29N	=2B	−5N	+37B	+20N	+13N	5.5	28.0	30.0	21.50	2172	+60.8
7	Mavrich, Demian	2212	ARG	+45B	+46N	−25B	+11N	+9B	+26N	=3N	5.5	26.5	29.5	22.75	2212	+4.2
8	Laurin, Ramiro	1862	ARG	+61B	−1N	+30B	+38N	=16B	+18N	=19B	5.0	27.0	29.5	19.00	2167	+70.4
9	Peral, Alexis	2009	ARG	+60N	+36B	−3N	+28B	−7N	+32B	+27N	5.0	26.5	29.0	18.00	2031	+8.0
10	Pereyra, Gabriel Elias	2044	ARG	+63B	+66N	−1B	+24N	−4N	+28B	+25B	5.0	26.5	29.0	17.50	2096	+11.6
11	Barrotto, Jose Ignacio	1845	ARG	+82N	−4B	+35N	−7B	+45N	+34B	+49N	5.0	24.5	25.0	14.00	2027	+25.4
12	Pacheco, DanielFM	2208	ARG	−69B	+65N	+27B	+46N	+44B	+25N	−2B	5.0	23.0	25.0	17.00	2072	-13.6
13	Mavrich, Leandro	2154	ARG	+37B	=24N	+20B	−2N	+66B	+23N	−6B	4.5	28.5	31.0	17.25	2038	-14.4
14	Leskovar, MarioIM	2174	ARG	+52B	+33N	+48B	−1N	+21B	−4B	=15N	4.5	27.5	30.5	16.75	2090	-4.6
15	Correa, Leonardo Aluhe	1922	ARG	+65B	+69N	=5B	+18N	−2B	=16N	=14B	4.5	27.5	29.5	16.25	2169	+36.6
16	Needleman, AlejandroIM	2213	ARG	+35N	+31B	+26N	−3B	=8N	=15B	=44N	4.5	26.5	30.0	18.00	2088	-8.0
17	Protto, Lautaro	1976	ARG	+55N	+32B	−4N	=59B	+40N	+22B	−5N	4.5	26.0	28.5	16.25	1948	-1.6
18	Jimenez, JoaquinCM	2157	ARG	+42N	+40B	=23N	−15B	+31N	−8B	+36N	4.5	25.0	28.5	16.75	1934	-31.0
19	Contin, DanielIM	2209	ITA	+50N	=41B	=59N	+23B	−26N	+33B	=8N	4.5	24.0	26.5	17.00	1967	-16.6
20	Fontanals, Juan	1916	ARG	+72N	=59B	−13N	+42B	+36N	−6B	+40N	4.5	23.0	25.0	13.75	1860	-5.6
21	Alvarez, Ciro	1859	ARG	+87N	−3B	+51N	+47B	−14N	=35B	+39N	4.5	23.0	23.0	11.25	1862	-3.6
22	Dietz, Carlos	1854	ARG	+81B	−2N	+45B	=48N	+62B	−17N	+43B	4.5	22.5	23.0	11.00	1847	-2.8
23	Pesce, Carlos	1915	ARG	+77B	+76N	=18B	−19N	+48B	−13B	+35N	4.5	21.5	23.0	11.75	1960	+5.8
24	De Los Santos, Jeremias	1804	ARG	+86N	=13B	=49N	−10B	=39N	+64B	+59N	4.5	21.0	21.0	10.50	1884	+24.8
25	Flores, Angel	1868	ARG	+78N	+47B	+7N	+4B	−5N	−12B	−10N	4.0	29.5	30.5	15.00	2110	+51.2
26	Iovaldi, Sebastian	1998	ARG	+62B	+67N	−16B	+29N	+19B	−7B	F	4.0	25.0	27.5	13.50	2065	+13.8
27	Herrera, Lara	1645	ARG	−3N	+87B	−12N	+78B	+38N	+31B	−9B	4.0	24.0	24.0	8.50	1792	+19.6
28	Oller, Leandro Esteban	1807	ARG	+74B	−5N	+52B	−9N	+69B	−10N	+50B	4.0	23.5	25.5	10.00	1843	+7.2
29	Cugat, Xavier	1710	ARG	+53N	−6B	+60N	−26B	+52N	−49B	+47N	4.0	21.5	24.0	11.50	1756	+2.8
30	Pincheira, Lucas	1631	ARG	−4N	+82B	−8N	+81B	+47N	+41B	F	4.0	21.5	22.0	7.50	1785	+9.4
31	Lujambio, Marcelo	1842	URU	+73B	−16N	+69B	+49N	−18B	−27N	+54B	4.0	21.0	23.0	10.00	1883	+3.8
32	Herrero, Gustavo Alfredo	1701	ARG	+38B	−17N	=61B	=76N	+70B	−9N	+56B	4.0	20.5	22.0	10.50	1710	-1.8
33	Bayinay, Juan Santiago	1824	ARG	+71N	−14B	=63N	+79B	=67N	−19N	+45B	4.0	19.0	20.0	8.50	1805	-5.6
34	Cuevas, Matias Jesus	1689	ARG	F	+72B	−47N	+60B	+53N	−11N	+48B	4.0	18.5	20.0	10.50	1691	+0.2
35	Conde, Alberto Jose Luis	1628	ARG	−16B	+73N	−11B	+71N	+46B	=21N	−23B	3.5	23.5	25.5	9.25	1748	+12.0
36	Nahuelmir, Jonas	1727	ARG	+56B	−9N	=62B	+61N	−20B	+37N	−18B	3.5	23.0	25.5	10.25	1685	-8.6
37	Ventura, Ignacio	1583	ARG	−13N	+86B	=40N	+41B	−6N	−36B	+68N	3.5	23.0	23.0	7.75	1772	+48.4
38	Roa, Sergio	0	ARG	−32N	+55B	+50N	−8B	−27B	=42N	+69B	3.5	22.5	24.5	9.75	1612	0.0
39	Madrid Cisneros, Alvaro	1603	ARG	−5B	+74N	−46B	+56N	=24B	+76N	−21B	3.5	22.5	24.0	8.75	1683	+14.0
40	Tohme, Jose Luis	1766	ARG	+84B	−18N	=37B	+63N	−17B	+62N	−20B	3.5	22.0	22.5	7.25	1733	-8.0
41	Quinteros, Omar	1836	ARG	+43B	=19N	−44B	−37N	+61B	−30N	+62B	3.5	21.5	24.0	10.75	1636	-26.8
42	Rugiero, Pablo Anibal	1584	ARG	−18B	=84N	+43B	−20N	=60B	=38B	+64N	3.5	21.0	21.5	9.25	1665	+4.2
43	Gonzalez Rust, Hernan	0	ARG	−41N	=50B	−42N	+72B	+68N	+58B	−22N	3.5	20.0	22.0	9.00	1652	0.0
44	Mendez, Agustin	1967	ARG	F	F	+41N	+53B	−12N	+67B	=16B	3.5	18.5	18.5	11.25	2083	+12.0
45	Inchausti, Sebastian	1625	ARG	−7N	+57B	−22N	+75B	−11B	+70N	−33N	3.0	24.0	26.0	7.00	1579	-14.4
46	Marquez Rosas, Vicente	1837	CHI	+57N	−7B	+39N	−12B	−35N	F	+51B	3.0	23.5	26.5	9.50	1787	-20.4
47	Zambrana, Leonardo	0	ARG	+58B	−25N	+34B	−21N	−30B	+61N	−29B	3.0	23.5	26.0	9.50	1615	0.0
48	Zander, Matias	0	ARG	+68N	+64B	−14N	=22B	−23N	=51B	−34N	3.0	23.0	25.5	8.75	1740	0.0
49	Uzcudun, Alfonso	2012	ARG	=64N	F	=24B	−31B	+59N	+29N	−11B	3.0	22.5	22.5	10.00	1738	-76.0
50	Regueiro, Marcelo Alejandro	1616	ARG	−19B	=43N	−38B	=65N	+71B	+75N	−28N	3.0	20.0	22.0	7.00	1112	-13.2
51	Specogna, Marcos Ezequiel	1644	ARG	−2B	+81N	−21B	+77N	=76B	=48N	−46N	3.0	19.5	20.0	4.25	1527	-11.0
52	Gonzalez, Miguel Hector	1585	ARG	−14N	+71B	−28N	+88B	−29B	−56N	+73B	3.0	19.5	19.5	4.00	1034	-25.2
53	Ponce, Luca	0	ARG	−29B	+70N	+58B	−44N	−34B	+69N	F	3.0	19.0	21.0	7.00	1701	0.0
54	Cortadi, Sergio	1662	ARG	−1B	−61N	−64N	+86B	+81N	+57B	−31N	3.0	18.5	18.5	3.50	1025	-38.8
55	Aguero Lo Moro, Gabriel	0	ARG	−17B	−38N	+73B	−58N	+74B	F	+71N	3.0	18.0	20.0	6.00	1030	0.0
56	Palomino, Gustavo	0	ARG	−36N	−60B	+87N	−39B	+78N	+52B	−32N	3.0	17.5	17.5	4.00	1391	0.0
57	Fortunati, Lucas	0	ARG	−46B	−45N	+65B	−69N	+77B	−54N	+70B	3.0	15.5	17.0	6.00	1416	0.0
58	Neirotti, Emiliano	1683	ARG	−47N	+78B	−53N	+55B	F	−43N	+76B	3.0	15.0	15.0	5.50	2454	+18.4
59	Loskin, Camilo	1578	ARG	F	=20N	=19B	=17N	−49B	+66N	−24B	2.5	23.5	23.5	9.25	1843	+66.4
60	Pujovich, Nicolas	1536	ARG	−9B	+56N	−29B	−34N	=42N	−68B	+77B	2.5	22.0	23.5	6.25	1354	-35.6
61	Colls Perdomo, Rigoberto	0	ARG	−8N	+54B	=32N	−36B	−41N	−47B	+78N	2.5	22.0	23.0	6.00	1609	0.0
62	Falciola Felix, Juan Martin Augus	1532	ARG	−26N	+83B	=36N	+68B	−22N	−40B	−41N	2.5	21.5	22.0	4.75	1607	+15.2
63	Alonso, Carlos Martin	1574	ARG	−10N	F	=33B	−40B	−64N	+65N	+66B	2.5	20.0	21.0	7.00	1628	+4.0
64	Vaschetti, Guillermo	1570	ARG	=49B	−48N	+54B	−66N	+63B	−24N	−42B	2.5	19.5	22.0	7.00	1667	+12.2
65	Backmann, Axel	0	ARG	−15N	−12B	−57N	=50B	+83N	−63B	+81N	2.5	18.5	19.0	2.50	1508	0.0
66	Sandoval Rojas, Brian	1750	ARG	+80N	−10B	=79N	+64B	−13N	−59B	−63N	2.5	18.0	19.0	4.00	1552	-67.6
67	Fortunati, Martin	1694	ARG	+83N	−26B	+75N	F	=33B	−44N	F	2.5	17.0	17.0	4.50	1657	-5.2
68	Arce, Pablo	1681	ARG	−48B	+77N	=76B	−62N	−43B	+60N	−37B	2.5	16.5	18.0	4.75	1490	-21.2
69	Meineri, Carlos	1606	ARG	+12N	−15B	−31N	+57B	−28N	−53B	−38N	2.0	24.0	27.0	8.00	1701	+7.0
70	Borghetti, Domingo Jorge	1546	ARG	−6N	−53B	+82N	+85B	−32N	−45B	−57N	2.0	19.0	19.5	1.00	1538	-2.4
71	Iniguez, Miguel Angel	0	ARG	−33B	−52N	+72N	−35B	−50N	+78B	−55B	2.0	18.5	19.5	3.00	863	0.0
72	Backmann, Joel	0	ARG	−20B	−34N	−71B	−43N	+86B	+74N	−75B	2.0	18.0	18.0	2.00	1003	0.0
73	Ferrada, Emanuel	0	ARG	−31N	−35B	−55N	=80B	+87N	=79B	−52N	2.0	15.5	15.5	1.00	1330	0.0
74	FIDE 20074115	0	—	−28N	−39B	−78N	+87B	−55N	−72B	+86N	2.0	13.5	13.5	0.00	905	0.0
75	FIDE 20062443	0	—	F	F	−67B	−45N	+82B	−50B	+72N	2.0	11.0	11.0	2.50	845	0.0
76	Vega, Hector	0	ARG	F	−23B	=68N	=32B	=51N	−39B	−58N	1.5	22.0	24.5	4.75	1512	-44.4
77	FIDE 20053134	0	—	−23N	−68B	+86N	−51B	−57N	=80B	−60N	1.5	16.5	16.5	0.50	894	0.0
78	Calfuan, Daniel	0	ARG	−25B	−58N	+74B	−27N	−56B	−71N	−61B	1.0	18.5	20.5	2.00	932	0.0
79	Fortunati, Federico	1552	ARG	F	F	=66B	−33N	F	=73N	F	1.0	8.5	8.5	2.25	1594	+3.6
80	Moreno, Juan	0	ARG	−66B	F	F	=73N	F	=77N	F	1.0	8.5	8.5	1.75	950	0.0
81	Del Grosso Balboa, Jano	0	ARG	−22N	−51B	F	−30N	−54B	=85N	−65B	0.5	17.5	18.0	0.25	1322	0.0
82	Enriquez, Alejo	0	ARG	−11B	−30N	−70B	F	−75N	=83B	F	0.5	13.5	13.5	0.25	875	0.0
83	FIDE 20074301	0	—	−67B	−62N	F	F	−65B	=82N	F	0.5	8.5	8.5	0.25	814	0.0
84	Martinez, Joaquin	0	ARG	−40N	=42B	F	F	F	F	F	0.5	7.0	7.0	1.75	1482	0.0
85	Silva, Nicolas Ezequiel	1649	ARG	F	F	F	−70N	F	=81B	F	0.5	2.5	2.5	0.25	747	-25.6
86	FIDE 20074123	0	—	−24B	−37N	−77B	−54N	−72N	F	−74B	0.0	16.5	16.5	0.00	883	0.0
87	FIDE 20074182	0	—	−21B	−27N	−56B	−74N	−73B	F	F	0.0	15.5	15.5	0.00	952	0.0
88	FIDE 20074271	0	—	F	F	F	−52N	F	F	F	0.0	3.0	3.0	0.00	785	0.0

Key insights

Biggest movers and upsets — the story behind the numbers.

Top rating gainers

1Laurin, RamiroARG
+70.4
5.0 pts · #26
2Loskin, CamiloARG
+66.4
2.5 pts · #35
3Villordo, MatiasARG
+60.8
5.5 pts · #3

Top rating losers

1Uzcudun, AlfonsoARG
-76.0
3.0 pts · #23
2Sandoval Rojas, BrianARG
-67.6
2.5 pts · #49
3Vega, HectorARG
-44.4
1.5 pts · #51

Biggest upsets

R1+602 Elo gap
Meineri, Carlos1606 beat FMPacheco, Daniel2208
R4+382 Elo gap
Flores, Angel1868 beat IMLlanos, Guillermo2250
R3+344 Elo gap
Flores, Angel1868 beat Mavrich, Demian2212