49th Thailand Chess Championship 2026 - Open

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63 players participated in this 9-round tournament, held from 15 Apr 2026 to 19 Apr 2026 in Nonthaburi, Thailand. 3 titled players from 2 federations. Top 10 Elo average was 1998, and top seed was Thanadon Kulpruethanon (🇹🇭 THA, FM, 2276).

Thanadon Kulpruethanon (🇹🇭 THA, FM, 2276) won with 8.5/9, ahead of Ditsapat Niramitpattanakoson (7.5) and Tupfah Khumnorkaew (7.0). Kulpruethanon won solo starting round 5.

The biggest upset came in round 8: Dhi Tawankanjana (1615) beat Tinnakrit Arunnuntapanich (FM, 2100), a +485-point gap.

Location

🇹🇭Nonthaburi, Thailand

Dates

15 Apr 2026 → 19 Apr 2026

Time control

Standard: 90 minutes with 30 second increment from move 1

System

Swiss · 9 rounds

Top seed

🇹🇭FMThanadon Kulpruethanon2276

Avg top 10

1,998

Participants

Titled players · 3

FM×2

CM×1

Federations · 2 represented

🇹🇭Thailand×59

🇩🇰Denmark×1

Top 3

🥇
FMThanadon Kulpruethanon
🇹🇭THA·2276
8.5pts·2382perf+13.4
🥈
Ditsapat Niramitpattanakoson
🇹🇭THA·1811
7.5pts·2162perf+158.8
🥉
Tupfah Khumnorkaew
🇹🇭THA·2011
7.0pts·2122perf+26.8

How it unfolded

Top 6 · 9 rounds

FM Thanadon Kulpruethanon led from R5; +1.0-point edge over the runner-up. Title race converged from 2 co-leaders at R4 to 1 by R5.

Co-leaders

Kulpruethanon8.5Niramitpattanakoson7.5Khumnorkaew7Nattavutthisit6Bodemar6Buranasing6

R5–R9 · LEAD HELD

FM Thanadon Kulpruethanon never relinquished the lead after R5; final gap +1.0 over the runner-up.

R6 · HEAD-TO-HEAD · WINNER VS 2ND

FM Thanadon Kulpruethanon drew with Ditsapat Niramitpattanakoson (White).

WIN STREAKS · 2 top finishers

FM Thanadon Kulpruethanon 5+3 wins (R1–R5, R7–R9)Tupfah Khumnorkaew 3 wins (R1–R3)

Key matchups · top 4

Head-to-head between the four finishers

Player	1	2	3	4
1FMThanadon Kulpruethanon	*	½	1	—
2Ditsapat Niramitpattanakoson	½	*	½	1
3Tupfah Khumnorkaew	0	½	*	½
4Kavin Nattavutthisit	—	0	½	*

Grille américaine

#	Player	Elo	Fed	R1	R2	R3	R4	R5	R6	R7	R8	R9	Pts	Bu C1	Bu	SB	Perf	Δ
1	Kulpruethanon, ThanadonFM	2276	THA	+28N	+4B	+17N	+3B	+15N	=2B	+16N	+13B	+5N	8.5	47.0	51.5	47.75	2382	+13.4
2	Niramitpattanakoson, Ditsapat	1811	THA	+55N	+50B	=8N	+17B	+6N	=1N	=3B	+15B	+4N	7.5	46.5	49.0	38.25	2162	+158.8
3	Khumnorkaew, Tupfah	2011	THA	+35N	+20B	+9N	−1N	+16B	+15B	=2N	=6B	+13N	7.0	48.5	52.5	37.25	2122	+26.8
4	Maetavittayakorn, Chawakorn	1740	THA	+42B	−1N	+36B	=28N	+34B	+8B	=5N	+7N	−2B	6.0	46.5	50.5	29.25	1896	+49.0
5	Buranasing, Wanawee	1814	THA	+44B	−18N	+23B	+58N	+7B	=13N	=4B	+9N	−1B	6.0	45.5	47.5	28.25	1865	+11.6
6	Nattavutthisit, Kavin	1914	THA	+36B	+58N	+7B	=16N	−2B	=29N	+22B	=3N	=8B	6.0	45.0	47.0	28.25	1948	+9.6
7	Pienpoldeesakul, Baimon	1693	THA	+46N	+12B	−6N	+40B	−5N	+17B	+11N	−4B	+15N	6.0	44.0	47.5	29.50	1933	+98.8
8	Bodemar, JonathanCM	2166	THA	+23B	+49N	=2B	−19N	+28B	−4N	+31B	+18B	=6N	6.0	43.5	46.5	28.75	1917	-42.2
9	Limpetcharakul, Nutnapon	1756	THA	+56B	+27N	−3B	+26N	−13B	+37N	+21B	−5B	+20N	6.0	42.5	45.0	26.50	1821	+27.6
10	Akharaboollasez, Akharin	1841	THA	=30N	+51B	=11N	=20B	=14N	+23B	−18N	+29B	+17N	6.0	40.5	43.5	28.00	1742	-18.8
11	Chotesuparach, Vimutti	1653	THA	=51N	+34B	=10B	+49N	=19B	=21N	−7B	+22N	+31B	6.0	38.5	41.5	26.00	1884	+89.6
12	Siridanupath, Gavin	1876	THA	+37B	−7N	−28B	+42N	+32B	−18B	+38N	+36N	+14B	6.0	37.5	41.5	26.00	1687	-59.2
13	Jiroajvanichakorn, Rathasart	1878	THA	+45N	+29B	+18N	−15B	+9N	=5B	+14N	−1N	−3B	5.5	47.5	51.0	27.50	1900	+11.6
14	Tawankanjana, Dhi	1615	THA	+62B	−17N	+39B	+22N	=10B	+19N	−13B	+16B	−12N	5.5	41.5	42.5	23.00	1857	+82.0
15	Buakird, Apichit	2071	THA	+32B	+22N	+24B	+13N	−1B	−3N	+29B	−2N	−7B	5.0	49.0	53.5	24.50	1872	-38.2
16	Arunnuntapanich, TinnakritFM	2100	THA	+47N	+31B	+19N	=6B	−3N	+20B	−1B	−14N	=27B	5.0	46.5	50.0	23.50	1882	-41.0
17	Wongsawan, Thoetsak	1848	THA	+38N	+14B	−1B	−2N	+36B	−7N	+37B	+47N	−10B	5.0	45.5	49.0	21.00	1755	-21.0
18	Mongkoltawephun, Chanon	1614	THA	+25N	+5B	−13B	−21N	+44B	+12N	+10B	−8N	−19B	5.0	44.5	48.0	26.50	1812	+38.2
19	Liukasemsarn, Pakornnarong	1843	THA	F	+26N	−16B	+8B	=11N	−14B	=20N	+25B	+18N	5.0	42.5	45.0	26.50	1832	+0.4
20	Suwannaphong, Surasit	1708	THA	+52B	−3N	+55B	=10N	+24B	−16N	=19B	+21N	−9B	5.0	42.0	44.5	21.00	1816	+42.0
21	Wiwarin, Piyapon	1778	THA	−33N	+60B	=35N	+18B	+31N	=11B	−9N	−20B	+30N	5.0	39.5	41.0	20.50	1697	-13.8
22	Pantong, Tikampon	1714	THA	+48N	−15B	+30N	−14B	+35N	+38B	−6N	−11B	+41N	5.0	39.0	42.5	20.00	1645	-15.2
23	Surapongprapa, Rabil	1601	THA	−8N	+43B	−5N	+41B	+56B	−10N	=44B	=24N	+34B	5.0	38.5	41.0	18.75	1628	+1.4
24	Chotichanathawewong, Sanquan	1752	THA	+60N	+33B	−15N	=29B	−20N	+30B	−25N	=23B	+35N	5.0	37.5	39.0	19.25	1688	-10.8
25	Wang, Ruojia	0	THA	−18B	+44N	−34B	=55N	+52B	+28N	+24B	−19N	=26B	5.0	35.0	37.5	19.75	1624	0.0
26	Chanthanam, Chaiyapat	1620	THA	+41N	−19B	+46N	−9B	−30N	=56B	+45B	+44N	=25N	5.0	35.0	37.5	18.25	1547	-20.4
27	Iamwattananan, Nattapong	1462	THA	+40N	−9B	−29N	+62B	−45N	+49N	=32B	+50B	=16N	5.0	33.5	34.5	15.75	1692	+88.4
28	Chaiyapong, Pasit	1604	THA	−1B	+42N	+12N	=4B	−8N	−25B	+56N	−30B	+48N	4.5	43.5	46.0	19.00	1673	+8.0
29	Sriwises, Tachit	1659	THA	+53B	−13N	+27B	=24N	+49B	=6B	−15N	−10N	=47B	4.5	39.0	42.0	18.25	1737	+26.0
30	Choophan, Thumtiwat	1483	THA	=10B	=39N	−22B	+53N	+26B	−24N	=34B	+28N	−21B	4.5	38.5	41.5	19.50	1658	+57.2
31	Bunnag, Pirat	1714	THA	+54B	−16N	=38B	+50N	−21B	+45N	−8N	+32B	−11N	4.5	37.0	40.0	16.00	1695	-18.0
32	Jongatireklap, Wacharaphol	1585	THA	−15N	+48B	−40N	+33B	−12N	+53B	=27N	−31N	+36B	4.5	36.5	39.5	17.50	1540	-9.6
33	Boonpung, Phongsathon	0	THA	+21B	−24N	−58B	−32N	−46B	+52N	+62B	=39N	+49B	4.5	30.0	31.0	14.00	1637	0.0
34	Boonin, Possawee	1647	THA	=39B	−11N	+25N	+51B	−4N	=41B	=30N	=35B	−23N	4.0	38.5	41.5	16.25	1377	-67.6
35	Samalapa, Sansern	1584	THA	−3B	+52N	=21B	=38N	−22B	=39N	+55B	=34N	−24B	4.0	37.0	39.5	14.00	1596	-11.2
36	Chulanon, Pongrak	1577	THA	−6N	+59B	−4N	+60B	−17N	+51B	+41N	−12B	−32N	4.0	36.5	38.0	10.50	994	-48.4
37	Nakthip, Nakorn	1530	THA	−12N	−46B	+47N	+39B	+40N	−9B	−17N	−41B	+51N	4.0	36.0	39.0	14.50	1700	+38.0
38	Dumoulin, Peissone	1529	THA	−17B	+53N	=31N	=35B	+58B	−22N	−12B	=43N	=39B	4.0	35.5	37.5	13.25	1618	+24.4
39	Sukcharoenyingyong, Sorawit	0	THA	=34N	=30B	−14N	−37N	+42B	=35B	=40N	=33B	=38N	4.0	34.5	38.5	16.50	1497	0.0
40	Chanpuek, Techit	1784	THA	−27B	+56N	+32B	−7N	−37B	−44N	=39B	+52N	=43B	4.0	34.0	36.5	14.00	1306	-117.6
41	Suwannicom, Raktham	0	THA	−26B	+57B	=50N	−23N	+55B	=34N	−36B	+37N	−22B	4.0	32.5	35.0	12.50	1543	0.0
42	FIDE 6229344	0	—	−4N	−28B	+59N	−12B	−39N	=48B	=51N	+62B	+55N	4.0	31.5	32.5	8.75	1479	0.0
43	Kaewsai, Phichayawat	0	THA	−49B	−23N	−53B	+54N	+62N	+50B	−47N	=38B	=40N	4.0	28.5	29.5	11.00	1514	0.0
44	Khamkuer, Thanthorn	1464	THA	−5N	−25B	+48N	+46B	−18N	+40B	=23N	−26B	F	3.5	37.0	40.5	13.50	1537	+14.0
45	Kangkorn, Sek	1563	THA	−13B	+61N	−49B	=52N	+27B	−31B	−26N	+53N	F	3.5	32.5	34.0	11.00	1442	-30.4
46	Rujiravanich, Pacific	0	THA	−7B	+37N	−26B	−44N	+33N	−47B	−50N	+61B	=56B	3.5	32.0	33.5	11.25	1309	0.0
47	Sucharit, Phop-phon	1594	THA	−16B	=54N	−37B	=57N	F	+46N	+43B	−17B	=29N	3.5	31.5	33.0	12.50	1472	-34.4
48	Kasabai, Arnon	0	THA	−22B	−32N	−44B	−61N	+59B	=42N	+60B	+55N	−28B	3.5	27.5	29.0	8.00	1326	0.0
49	Thongchok, Mr.Sahutsawat	1735	DEN	+43N	−8B	+45N	−11B	−29N	−27B	−53N	+59B	−33N	3.0	36.5	38.5	9.50	1454	-74.4
50	Rodraksa, Traya	1605	THA	F	−2N	=41B	−31B	=51N	−43N	+46B	−27N	+53B	3.0	34.5	34.5	10.00	856	-50.4
51	Srivannaboon, Sabiangtham	0	THA	=11B	−10N	+54B	−34N	=50B	−36N	=42B	=56N	−37B	3.0	34.0	36.5	10.75	1367	0.0
52	Khantiteeratam, Tatdanai	0	THA	−20N	−35B	+57N	=45B	−25N	−33B	+54N	−40B	=61N	3.0	31.5	33.0	8.00	1489	0.0
53	Sae-yang, Phasit	0	THA	−29N	−38B	+43N	−30B	+60N	−32N	+49B	−45B	−50N	3.0	31.0	32.5	8.50	1282	0.0
54	Kanitthabutr, Watchara	0	THA	−31N	=47B	−51N	−43B	−57B	+61N	−52B	=60N	+62N	3.0	23.5	24.5	5.00	1338	0.0
55	Panthong, Jakkid	1464	THA	−2B	+62N	−20N	=25B	−41N	+57B	−35N	−48B	−42B	2.5	35.5	36.5	6.00	1466	-1.6
56	Dhiantravan, Pichak	0	THA	−9N	−40B	F	+59B	−23N	=26N	−28B	=51B	=46N	2.5	33.0	33.0	7.75	1307	0.0
57	Somapa, Sakara	1503	THA	F	−41N	−52B	=47B	+54N	−55N	F	F	+63B	2.5	22.0	22.0	5.75	1585	+8.8
58	Ukachoke, Keeratipong	1697	THA	+59N	−6B	+33N	−5B	−38N	F	F	F	F	2.0	22.5	22.5	6.50	951	-51.6
59	Lertpraserdsiri, Jirasin	0	THA	−58B	−36N	−42B	−56N	−48N	F	+61B	−49N	+60B	2.0	22.0	22.0	3.00	869	0.0
60	Hongton, Suksun	0	THA	−24B	−21N	+61B	−36N	−53B	−62N	−48N	=54B	−59N	1.5	27.0	28.0	3.00	903	0.0
61	FIDE 6217419	0	—	−63N	−45B	−60N	+48B	F	−54B	−59N	−46N	=52B	1.5	23.5	24.5	5.00	829	0.0
62	FIDE 6231764	0	—	−14N	−55B	F	−27N	−43B	+60B	−33N	−42N	−54B	1.0	30.0	30.0	1.50	714	0.0
63	Buasroung, Ekasith	1695	THA	+61B	F	F	F	F	F	F	F	−57N	1.0	4.0	4.0	1.50	727	-14.4

Key insights

Biggest movers and upsets — the story behind the numbers.

Top rating gainers

1Niramitpattanakoson, DitsapatTHA
+158.8
7.5 pts · #2
2Pienpoldeesakul, BaimonTHA
+98.8
6.0 pts · #15
3Chotesuparach, VimuttiTHA
+89.6
6.0 pts · #7

Top rating losers

1Chanpuek, TechitTHA
-117.6
4.0 pts · #50
2Thongchok, Mr.SahutsawatDEN
-74.4
3.0 pts · #45
3Boonin, PossaweeTHA
-67.6
4.0 pts · #52

Biggest upsets

R8+485 Elo gap
Tawankanjana, Dhi1615 beat FMArunnuntapanich, Tinnakrit2100
R6+426 Elo gap
Maetavittayakorn, Chawakorn1740 beat CMBodemar, Jonathan2166
R9+378 Elo gap
Pienpoldeesakul, Baimon1693 beat Buakird, Apichit2071