21st Thailand Junior Chess Championship 2026 - U12

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35 players participated in this 9-round tournament, held from 10 Apr 2026 to 14 Apr 2026 in Nonthaburi, Thailand. Top 10 Elo average was 1620, and top seed was Pakornnarong Liukasemsarn (🇹🇭 THA, 1843).

Chawakorn Maetavittayakorn (🇹🇭 THA, 1740) won with 8.5/9, ahead of Pakornnarong Liukasemsarn (8.0) and Phuwin Louwakul (6.5). Maetavittayakorn won solo starting round 5.

The biggest upset came in round 7: Thanapat Karnjanaprapin (1426) beat Miles Chayun Huang (1719), a +293-point gap.

Location

🇹🇭Nonthaburi, Thailand

Dates

10 Apr 2026 → 14 Apr 2026

Time control

Standard: 90 minutes with 30 second increment from move 1

System

Swiss · 9 rounds

Top seed

🇹🇭Pakornnarong Liukasemsarn1843

Avg top 10

1,620

Participants

Federations · 1 represented

🇹🇭Thailand×25

Top 3

🥇
Chawakorn Maetavittayakorn
🇹🇭THA·1740
8.5pts·1987perf+51.8
🥈
Pakornnarong Liukasemsarn
🇹🇭THA·1843
8.0pts·1887perf+18.4
🥉
Phuwin Louwakul
🇹🇭THA·1549
6.5pts·1673perf+34.8

How it unfolded

Top 6 · 9 rounds

Chawakorn Maetavittayakorn led from R5; +0.5-point edge over the runner-up. Title race converged from 2 co-leaders at R4 to 1 by R5.

Co-leaders

Maetavittayakorn8.5Liukasemsarn8Louwakul6.5Mamark6Juntongjin6Chungsaengsatitayaporn6

R5–R9 · LEAD HELD

Chawakorn Maetavittayakorn held the sole lead from R5 through R9 without losing it.

R5 · HEAD-TO-HEAD · WINNER VS 2ND

Chawakorn Maetavittayakorn beat Pakornnarong Liukasemsarn (Black).

WIN STREAKS · 2 top finishers

Chawakorn Maetavittayakorn 8 wins (R1–R8)Pakornnarong Liukasemsarn 4+4 wins (R1–R4, R6–R9)

Key matchups · top 4

Head-to-head between the four finishers

Player	1	2	3	4
1Chawakorn Maetavittayakorn	*	1	1	1
2Pakornnarong Liukasemsarn	0	*	1	—
3Phuwin Louwakul	0	0	*	—
4Chanon Mamark	0	—	—	*

Grille américaine

#	Player	Elo	Fed	R1	R2	R3	R4	R5	R6	R7	R8	R9	Pts	Bu C1	Bu	SB	Perf	Δ
1	Maetavittayakorn, Chawakorn	1740	THA	+9N	+13B	+7N	+5B	+2N	+3B	+8N	+6B	=4N	8.5	49.0	54.0	51.00	1987	+51.8
2	Liukasemsarn, Pakornnarong	1843	THA	+21B	+10N	+3B	+8N	−1B	+4N	+16B	+7N	+12B	8.0	47.0	51.5	43.00	1887	+18.4
3	Louwakul, Phuwin	1549	THA	+20N	+28B	−2N	+4B	+9N	−1N	=17B	+8B	+10N	6.5	48.0	51.5	32.75	1673	+34.8
4	Juntongjin, Prin	1546	THA	+27B	+16N	+12B	−3N	+19B	−2B	=7N	+17N	=1B	6.0	47.0	50.5	29.00	1615	+15.2
5	Mamark, Chanon	1502	THA	+26B	+32N	+11B	−1N	=18N	−7B	=9N	+14B	+13N	6.0	43.0	45.5	26.50	1618	+40.8
6	Chungsaengsatitayaporn, Tarit	0	THA	+35N	−7B	+23N	−18B	+?N	+31B	+13N	−1N	+17B	6.0	36.5	36.5	18.00	1454	0.0
7	Suriyajan, Chayakorn	1646	THA	+22B	+6N	−1B	+27N	=8B	+5N	=4B	−2B	=11N	5.5	49.5	53.0	28.00	1533	-37.6
8	Chanwittayanuchit, Worakorn	1459	THA	+31N	+34B	+18N	−2B	=7N	+12B	−1B	−3N	+16B	5.5	45.5	47.5	21.75	1635	+46.8
9	Damchum, Supreechon	0	THA	−1B	+26N	+?B	+12N	−3B	+19N	=5B	−10N	+18N	5.5	44.0	44.0	20.50	1537	0.0
10	Karnjanaprapin, Thanapat	1426	THA	+23N	−2B	+31N	−22B	=17N	+28B	+18N	+9B	−3B	5.5	40.5	43.5	22.75	1568	+16.4
11	Yodpijit, Vincent Tho	1519	THA	=14N	+24B	−5N	=15B	−31N	+26B	+28N	+16N	=7B	5.5	37.0	40.0	23.25	1519	+2.0
12	Arun, Naruebej	1676	THA	+33N	+17B	−4N	−9B	+14N	−8N	+23B	+20B	−2N	5.0	43.0	45.5	20.50	812	-71.2
13	Kultungkijsaree, Pichayut	1416	THA	+29B	−1N	−16B	+25N	+27B	+22N	−6B	+19N	−5B	5.0	41.0	44.5	19.50	799	-28.8
14	Kijkamjai, Arthicha	0	THA	=11B	=15N	+35B	−19N	−12B	+21N	+22B	−5N	+26B	5.0	38.0	39.5	18.75	1275	0.0
15	Boonyachan, Chayapol	0	THA	−16B	=14B	+?N	=11N	−28B	−23N	+25B	+27N	+22B	5.0	34.0	34.0	16.75	1504	0.0
16	Rojrudakorn, Poraphat	0	THA	+15N	−4B	+13N	=17B	+22N	+18B	−2N	−11B	−8N	4.5	44.0	48.0	20.75	1465	0.0
17	Chalermtiwakorn, Nattakorn	0	THA	+?N	−12N	+29B	=16N	=10B	+20B	=3N	−4B	−6N	4.5	41.5	41.5	16.25	1357	0.0
18	Huang, Miles Chayun	1719	THA	+30B	+19N	−8B	+6N	=5B	−16N	−10B	+29N	−9B	4.5	41.0	44.5	20.50	1175	-78.8
19	Oppenheim, Tyler	1409	THA	+?N	−18B	+28N	+14B	−4N	−9B	+31N	−13B	=20N	4.5	37.0	37.0	13.75	782	0.0
20	Kaewsai, Phichayawat	0	THA	−3B	−?N	+21B	+29N	+23B	−17N	+27B	−12N	=19B	4.5	36.0	36.0	17.75	811	0.0
21	Courtes, Paniti Tulyasuwan	0	THA	−2N	−31B	−20N	+32B	+?N	−14B	=26N	+33B	+29N	4.5	32.5	32.5	10.25	1026	0.0
22	FIDE 6229263	0	—	−7N	+?B	+32N	+10N	−16B	−13B	−14N	+31B	−15N	4.0	36.0	36.0	11.00	1393	0.0
23	FIDE 6227473	0	—	−10B	+30N	−6B	+34N	−20N	+15B	−12N	+24B	−?N	4.0	35.5	35.5	14.50	1398	0.0
24	Chitvarakorn, Chawapol	1456	THA	−28B	−11N	−26B	+30N	+25B	−27N	+34B	−23N	+35B	4.0	29.5	31.0	11.00	704	-17.2
25	FIDE 6232043	0	—	F	F	+33N	−13B	−24N	+32B	−15N	+?B	+31N	4.0	22.0	22.0	8.00	669	0.0
26	FIDE 6232582	0	—	−5N	−9B	+24N	−?B	+35B	−11N	=21B	+30N	−14N	3.5	35.5	35.5	11.25	1347	0.0
27	Keongamaroon, Arthit	0	THA	−4N	+?B	+34N	−7B	−13N	+24B	−20N	−15B	=28B	3.5	35.5	35.5	7.75	1340	0.0
28	FIDE 6230962	0	—	+24N	−3N	−19B	+?B	+15N	−10N	−11B	−?B	=27N	3.5	34.5	34.5	10.75	1288	0.0
29	Prachachaisri, Plongphon	0	THA	−13N	+33B	−17N	−20B	+34B	=30N	+?N	−18B	−21B	3.5	31.0	31.0	6.25	800	0.0
30	Danpiboon, Setthawut	0	THA	−18N	−23B	−?N	−24B	+?N	=29B	+32N	−26B	+33N	3.5	24.5	24.5	6.75	787	0.0
31	FIDE 6223125	0	—	−8B	+21N	−10B	+35N	+11B	−6N	−19B	−22N	−25B	3.0	39.5	41.0	11.50	1340	0.0
32	FIDE 6232442	0	—	+?N	−5B	−22B	−21N	−33B	−25N	−30B	=35N	+34B	2.5	28.0	28.0	2.75	655	0.0
33	FIDE 6224245	0	—	−12B	−29N	−25B	+?B	+32N	−?B	=?N	−21N	−30B	2.5	23.0	23.0	2.50	886	0.0
34	FIDE 6232353	0	—	F	−8N	−27B	−23B	−29N	+?B	−24N	+?B	−32N	2.0	23.0	23.0	0.00	659	0.0
35	FIDE 6231942	0	—	−6B	F	−14N	−31B	−26N	−?B	+?N	=32B	−24N	1.5	24.0	24.0	1.25	656	0.0

Key insights

Biggest movers and upsets — the story behind the numbers.

Top rating gainers

1Maetavittayakorn, ChawakornTHA
+51.8
8.5 pts · #1
2Chanwittayanuchit, WorakornTHA
+46.8
5.5 pts · #6
3Mamark, ChanonTHA
+40.8
6.0 pts · #7

Top rating losers

1Huang, Miles ChayunTHA
-78.8
4.5 pts · #22
2Arun, NaruebejTHA
-71.2
5.0 pts · #26
3Suriyajan, ChayakornTHA
-37.6
5.5 pts · #4

Biggest upsets

R7+293 Elo gap
Karnjanaprapin, Thanapat1426 beat Huang, Miles Chayun1719
R3+260 Elo gap
Chanwittayanuchit, Worakorn1459 beat Huang, Miles Chayun1719
R6+217 Elo gap
Chanwittayanuchit, Worakorn1459 beat Arun, Naruebej1676