1st Bangkok Summer International Chess Open 2025

SwissStandard

66 players participated in this 9-round tournament, held from 04 Jul 2025 to 09 Jul 2025 in Bangkok, Thailand. 15 titled players from 8 federations. Top 10 Elo average was 2289, and top seed was Sayantan Das (🇮🇳 IND, GM, 2434).

Michael Jr. Concio (🇵🇭 PHI, IM, 2396) won with 9.0/9, ahead of Nithin Babu (7.0) and Sayantan Das (7.0). Concio won solo starting round 5.

The biggest upset came in round 1: Nguyen Minh (1838) beat Khamparia Akshat (IM, 2315), a +477-point gap.

Location

🇹🇭Bangkok, Thailand

Dates

04 Jul 2025 → 09 Jul 2025

Time control

Standard: 90 minutes with 30 second increment from move 1

System

Swiss · 9 rounds

Top seed

🇮🇳GMSayantan Das2434

Avg top 10

2,289

Participants

Titled players · 15

GM×2

IM×2

FM×8

CM×1

WFM×1

WCM×1

Federations · 8 represented

🇨🇳China×11

🇵🇭Philippines×9

🇹🇭Thailand×8

🇮🇳India×7

🇲🇾Malaysia×5

🇲🇲Myanmar×3

🇹🇼Chinese Taipei×3

🇸🇬Singapore×3

Top 3

🥇
IMMichael Jr. Concio
🇵🇭PHI·2396
9.0pts·2994perf+24.9
🥈
Nithin Babu
🇮🇳IND·2298
7.0pts·2339perf+15.6
🥉
GMSayantan Das
🇮🇳IND·2434
7.0pts·2371perf-3.8

How it unfolded

Top 6 · 9 rounds

IM Michael Jr. Concio led from R5; +2.0-point edge over the runner-up. Title race converged from 2 co-leaders at R4 to 1 by R5.

Co-leaders

Concio9Das7Babu7Quizon6.5Chernyavsky6.5Liu6

R5–R9 · LEAD HELD

IM Michael Jr. Concio never relinquished the lead after R5; final gap +2.0 over the runner-up.

R7 · HEAD-TO-HEAD · WINNER VS 2ND

IM Michael Jr. Concio beat GM Sayantan Das (Black).

WIN STREAKS · 3 top finishers

IM Michael Jr. Concio 9 wins (R1–R9)GM Sayantan Das 3 wins (R1–R3)Nithin Babu 3 wins (R3–R5)

Key matchups · top 4

Head-to-head between the four finishers

Player	1	2	3	4
1IMMichael Jr. Concio	*	1	1	1
2GMSayantan Das	0	*	—	—
3Nithin Babu	0	—	*	1
4GMDaniel Quizon	0	—	0	*

Grille américaine

#	Player	Elo	Fed	R1	R2	R3	R4	R5	R6	R7	R8	R9	Pts	Bu C1	Bu	SB	Perf	Δ
1	Concio, Michael Jr.IM	2396	PHI	+58N	+46B	+19N	+5B	+4N	+2B	+3N	+8B	+9N	9.0	46.5	49.0	49.00	2994	+24.9
2	Nithin Babu	2298	IND	+14B	=25N	+52B	+6N	+9B	−1N	+32B	+5B	=4N	7.0	48.0	51.0	36.50	2339	+15.6
3	Das, SayantanGM	2434	IND	+23N	+8B	+34N	−4B	+19N	+10B	−1B	+18N	+11B	7.0	47.0	51.0	35.50	2371	-3.8
4	Chernyavsky, AlexanderFM	2332	RUS	+35B	+27N	+24B	+3N	−1B	−18N	+34B	+10N	=2B	6.5	46.5	50.5	33.00	2322	+3.6
5	Quizon, DanielGM	2430	PHI	+33B	+37N	+18B	−1N	+22B	=32N	+11B	−2N	+8B	6.5	46.0	50.0	31.75	2290	-10.3
6	Dayal, Samar	1926	ENG	+53N	+48B	=49N	−2B	+12N	−34N	+37B	=13N	+20B	6.0	38.0	41.0	25.50	2189	+112.5
7	Liu, Zhengcheng	1890	CHN	+54B	−11N	+38B	−18N	+29B	−13N	+47B	+35N	+24B	6.0	36.5	39.5	23.50	2038	+64.2
8	Morris-Suzuki, Alan H	1986	USA	+47B	−3N	+42B	+41N	=11B	+9N	+18B	−1N	−5N	5.5	46.5	50.0	24.75	2187	+43.2
9	Batashevs, Arsens	2206	LAT	=20N	+66B	+12N	+32B	−2N	−8B	+35B	+15N	−1B	5.5	46.0	46.5	22.50	2100	-17.4
10	Sai Han ThihaFM	2121	MYA	+38B	=52N	+25B	=13N	+15B	−3N	+24B	−4B	=22N	5.5	42.5	45.5	25.25	2145	+13.7
11	Morris-Suzuki, SophieWFM	2145	USA	+36N	+7B	−32N	+46B	=8N	+49B	−5N	+31B	−3N	5.5	41.5	45.0	24.25	2132	-0.2
12	Villanueva, NelsonFM	2097	PHI	=26B	+21N	−9B	+51N	−6B	=16N	+29B	+28N	=14B	5.5	41.0	44.0	24.75	1933	-30.8
13	Akshat, KhampariaIM	2315	IND	−17N	+55B	+58N	=10B	=45N	+7B	=22N	=6B	=16N	5.5	40.5	43.0	24.50	2042	-24.6
14	Mai, Duc Kien	1835	VIE	−2N	=57B	+30N	=36B	=46N	+25B	+48N	=22B	=12N	5.5	37.5	40.5	23.00	2030	+82.1
15	Chen, Xianlin	1875	CHN	+51B	−18N	+63B	+24N	−10N	=48B	+49N	−9B	+31N	5.5	35.0	36.5	18.75	2061	+76.0
16	Lau, Sau Ching	1867	MAS	+62B	−19N	−51B	+57B	=26N	=12B	+40N	+34N	=13B	5.5	34.5	36.0	20.25	1936	+17.6
17	Nguyen Minh	1838	VIE	+13B	−24N	−45B	+62N	=37B	−27N	+59B	+46N	+26B	5.5	33.0	34.5	19.50	1999	+74.1
18	Salvador, Louie	2105	PHI	+39N	+15B	−5N	+7B	+48N	+4B	−8N	−3B	F	5.0	44.5	44.5	25.50	2209	+21.2
19	Nay Lin TunCM	2058	MYA	+40N	+16B	−1B	+59N	−3B	−35N	+21B	−20N	+36B	5.0	43.5	46.0	21.00	1989	-16.4
20	Siddharth, Sai	1831	SGP	=9B	+26N	−22B	−52N	=33B	+53N	+41B	+19B	−6N	5.0	37.5	40.5	21.50	1949	+50.5
21	Chen, Baize	1698	CHN	=45N	−12B	−36N	+50B	+23N	+46B	−19N	=25B	+39N	5.0	35.5	39.0	20.25	1935	+92.7
22	Buakird, Apichit	2002	THA	=56N	+65B	+20N	+49B	−5N	F	=13B	=14N	=10B	5.0	35.5	35.5	19.25	2083	+17.2
23	Akharaboollasez, Akharin	1858	THA	−3B	−47N	+53B	=55N	−21B	+64N	=36B	+54N	+38B	5.0	32.5	34.0	15.00	1794	-16.6
24	Ko Ko OhnFM	2045	MYA	+30N	+17B	−4N	−15B	+25N	+28B	−10N	=26B	−7N	4.5	42.5	47.0	21.25	1927	-13.5
25	Teo, Hong Ming	1938	SGP	+44B	=2B	−10N	+47N	−24B	−14N	+33B	=21N	=29B	4.5	40.5	44.0	20.25	1880	-13.2
26	Anish Ramkumar	1757	IND	=12N	−20B	+65N	=28B	=16B	=41N	+52B	=24N	−17N	4.5	37.5	38.5	16.00	1873	+48.0
27	Wang, Jiyan	1939	CHN	+57N	−4B	+39N	−34B	=36N	+17B	−31N	−41B	+46N	4.5	36.0	39.0	18.00	1902	-20.0
28	Gnanasekar, Jai Adithya	1880	SGP	+60B	−34N	=47B	=26N	+38B	−24N	+51B	−12B	=30N	4.5	33.5	36.0	15.75	1808	-28.9
29	Ainul Fikri, Aqilah Husna	1793	MAS	−49N	+61B	−46N	+56B	−7N	+43B	−12N	+50B	=25N	4.5	33.5	35.5	14.75	1820	+7.8
30	Piyush Khurana	1702	IND	−24B	=33N	−14B	+64N	=47B	+42N	−46B	+52N	=28B	4.5	33.0	34.5	14.75	1838	+31.2
31	Lu, Weiyang	1783	CHN	−34B	+54N	−37B	+63N	=41B	+59N	+27B	−11N	−15B	4.5	33.0	34.5	13.50	1882	+35.2
32	Zhang, Haoxuan(ZJ)FM	2050	CHN	+55B	+63N	+11B	−9N	+34B	=5B	−2N	F	F	4.5	33.0	33.0	17.25	2212	+51.6
33	Ling, Guohan	1848	CHN	−5N	=30B	−57N	+65B	=20N	=39B	−25N	+58B	+59N	4.5	32.5	33.5	12.75	1821	-9.0
34	Habla, JonyFM	2131	PHI	+31N	+28B	−3B	+27N	−32N	+6B	−4N	−16B	F	4.0	43.0	43.0	19.50	2026	-20.4
35	Shanmathi Sree SWCM	1839	IND	−4N	+43B	−48N	+39B	+40N	+19B	−9N	−7B	−45N	4.0	39.0	42.5	17.00	1933	+33.6
36	Feng, Kuixiu	1815	CHN	−11B	=44N	+21B	=14N	=27B	−37N	=23N	+43B	−19N	4.0	38.5	42.5	18.50	1822	-1.2
37	Marin, Sam	1970	CAN	+43N	−5B	+31N	−48B	=17N	+36B	−6N	=39B	F	4.0	38.5	42.0	17.25	1920	-11.8
38	Lim, Kian Guan	1777	MAS	−10N	+50B	−7N	+43B	−28N	−40B	+56N	+51B	−23N	4.0	35.5	38.5	13.50	1720	-13.2
39	Kurniawan, Theodore Daniel	1773	INA	−18B	+60N	−27B	−35N	+44B	=33N	+42B	=37N	−21B	4.0	35.0	37.5	14.75	1780	+0.8
40	Joseph, Samuel Alexander	1737	INA	−19B	−51N	+54B	+42N	−35B	+38N	−16B	+47N	F	4.0	33.0	36.0	14.50	1767	+10.8
41	Rohland, Michael Karl	1880	CAN	+61N	−49B	+56N	−8B	=31N	=26B	−20N	+27N	F	4.0	32.5	32.5	14.00	1832	-9.0
42	Leong, Khai Shen	1819	MAS	−48N	+53B	−8N	−40B	+54N	−30B	−39N	+62B	+51N	4.0	30.5	32.0	10.50	1688	-60.8
43	Peng, Shiyang	1654	CHN	−37B	−35N	+61B	−38N	+62B	−29N	+55B	−36N	+53B	4.0	28.5	30.0	9.50	1682	+8.7
44	Surapongprapa, Rabil	1618	THA	−25N	=36B	=66N	−58B	−39N	+62B	−50N	+56B	+54B	4.0	26.0	26.5	9.75	1659	+16.8
45	Wiwatanadate, PoompongFM	2032	THA	=21B	F	+17N	F	=13B	+51N	F	F	+35B	4.0	23.0	23.0	17.75	2107	+11.0
46	Romualdez, Davin Sean	1940	PHI	+64B	−1N	+29B	−11N	=14B	−21N	+30N	−17B	−27B	3.5	44.0	45.5	13.25	1803	-69.2
47	Zhang, Zhirui	1655	CHN	−8N	+23B	=28N	−25B	=30N	+58B	−7N	−40B	=50N	3.5	37.5	40.0	13.75	1736	+31.9
48	Caparino, Diego Abraham	2194	PHI	+42B	−6N	+35B	+37N	−18B	=15N	−14B	F	F	3.5	34.0	34.0	14.75	1910	-45.6
49	Mangao, Danny MaerskFM	2138	PHI	+29B	+41N	=6B	−22N	+52B	−11N	−15B	F	F	3.5	33.5	33.5	14.50	1927	-35.8
50	Lasani H Kothari	1511	IND	−52B	−38N	=64B	−21N	+63B	=55N	+44B	−29N	=47B	3.5	28.5	30.0	9.50	1582	+12.2
51	Mongkoltawephun, Chanon	1550	THA	−15N	+40B	+16N	−12B	+58N	−45B	−28N	−38N	−42B	3.0	37.0	39.5	12.00	1731	+66.4
52	Rolston, Daniel Haruma	1871	JPN	+50N	=10B	−2N	+20B	−49N	=57B	−26N	−30B	F	3.0	36.5	36.5	12.75	1784	-43.6
53	Luo, Mian	1600	CHN	−6B	−42N	−23N	+60B	+56N	−20B	=58N	=59B	−43N	3.0	32.0	34.5	8.00	1656	+20.4
54	Liukasemsarn, Pakornnarong	1579	THA	−7N	−31B	−40N	+61N	−42B	+63B	+64N	−23B	−44N	3.0	31.0	32.5	5.00	1546	-12.7
55	Smirnov, Maksim M.	1721	RUS	−32N	−13N	+60B	=23B	−57N	=50B	−43N	+63B	F	3.0	30.5	32.0	8.25	1610	-49.2
56	Homsetnan, Tanatch	1657	THA	=22B	=59N	−41B	−29N	−53B	+61N	−38B	−44N	+65N	3.0	29.0	30.0	6.75	1614	-25.2
57	Romualdez, Danry Seth	1624	PHI	−27B	=14N	+33B	−16N	+55B	=52N	F	F	F	3.0	26.0	26.0	11.75	1847	+66.0
58	Nguyen, Paul Ashton	1848	HKG	−1B	+64N	−13B	+44N	−51B	−47N	=53B	−33N	F	2.5	35.5	37.0	7.00	1661	-85.2
59	Kebbedies, Frank	1882	GER	=65N	=56B	+62N	−19B	F	−31B	−17N	=53N	−33B	2.5	28.0	28.0	5.00	1586	-58.8
60	Sripakdee, Padungsak	1557	THA	−28N	−39B	−55N	−53N	−61B	+65B	−62N	+64B	=63N	2.5	21.0	22.0	3.25	1455	-22.0
61	Narayanan, Sri Shiva Kumar	1551	MAS	−41B	−29N	−43N	−54B	+60N	−56B	−63N	=65B	=62N	2.0	24.0	25.0	3.75	1448	-22.6
62	Ishchenko-Giller, Matvii	1458	UKR	−16N	F	−59B	−17B	−43N	−44N	+60B	−42N	=61B	1.5	30.0	30.0	3.50	1469	-4.8
63	Hsin, Kai-En	0	TPE	F	−32B	−15N	−31B	−50N	−54N	+61B	−55N	=60B	1.5	28.5	28.5	3.25	1453	0.0
64	Wang, Zi-Jie	1650	TPE	−46N	−58B	=50N	−30B	+65N	−23B	−54B	−60N	F	1.5	25.5	25.5	2.75	1442	-84.8
65	Lai, Yun-Cheng	1558	TPE	=59B	−22N	−26B	−33N	−64B	−60N	F	=61N	−56B	1.0	25.5	25.5	2.25	1411	-50.8
66	Frost, Peter	1739	AUS	F	−9N	=44B	F	F	F	F	F	F	0.5	9.5	9.5	2.00	1686	-4.8

Key insights

Biggest movers and upsets — the story behind the numbers.

Top rating gainers

1Dayal, SamarENG
+112.5
6.0 pts · #7
2Chen, BaizeCHN
+92.7
5.0 pts · #18
3Mai, Duc KienVIE
+82.1
5.5 pts · #15

Top rating losers

1Nguyen, Paul AshtonHKG
-85.2
2.5 pts · #56
2Wang, Zi-JieTPE
-84.8
1.5 pts · #63
3Romualdez, Davin SeanPHI
-69.2
3.5 pts · #46

Biggest upsets

R1+477 Elo gap
Nguyen Minh1838 beat IMAkshat, Khamparia2315
R7+359 Elo gap
Mai, Duc Kien1835 beat Caparino, Diego Abraham2194
R3+317 Elo gap
Mongkoltawephun, Chanon1550 beat Lau, Sau Ching1867