CChessStats

Big Rook After-Work Chess Tournament - October 2025

Open SwissStandard

15 players participated in this 6-round tournament, held from 01 Oct 2025 to 10 Oct 2025 in Bangkok, Thailand. 3 titled players from 3 federations. Top 10 Elo average was 1767, and top seed was Sai Han Thiha (🇲🇲 MYA, FM, 2113).

Sai Han Thiha (🇲🇲 MYA, FM, 2113) won with 5.5/6, ahead of Poompong Wiwatanadate (4.5) and Nikolay Gutsulyak (4.5). Thiha won solo starting round 5.

The biggest upset came in round 4: Nikolay Gutsulyak (1844) beat Ko Ko Ohn (FM, 2030), a +186-point gap.

Location
🇹🇭Bangkok, Thailand
Dates
01 Oct 2025 → 10 Oct 2025
Time control
Standard: 60 minutes with 30 seconds increment from move 1
System
Swiss · 6 rounds
Top seed
🇲🇲FMSai Han Thiha2113
Avg top 10
1,767
Participants
15
Titled players · 3
FM×3
Federations · 3 represented
🇹🇭Thailand×7
🇷🇺Russia×4
🇲🇲Myanmar×2
Top 3

How it unfolded

Top 6 · 6 rounds

FM Sai Han Thiha 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
6
2
4
2
1
1
1.534.56R1R2R3R4R5R6
Thiha5.5Wiwatanadate4.5Gutsulyak4.5Siripatvanich3.5Ohn3.5Dumoulin2.5
R5–R6 · LEAD HELD

FM Sai Han Thiha never relinquished the lead after R5; final gap +1.0 over the runner-up.

R4 · HEAD-TO-HEAD · WINNER VS 2ND

FM Sai Han Thiha beat FM Poompong Wiwatanadate (Black).

R3–R6 · WIN STREAK

FM Sai Han Thiha won 4 in a row (R3–R6).

Key matchups · top 4

Head-to-head between the four finishers
Player1234
1FMSai Han Thiha*
1
½
1
2FMPoompong Wiwatanadate
0
*
1
1
3Nikolay Gutsulyak
½
0
*—
4Nonglak Siripatvanich
0
0
—*

Grille américaine

#PlayerEloFedR1R2R3R4R5R6PtsBu C1BuSBPerfΔ
1Sai Han ThihaFM2113MYA+5B=3N+8B+2N+4B+6N5.518.521.018.752246+28.8
2Wiwatanadate, PoompongFM2054THA+9N+8B=4N−1B+3B+5N4.519.521.514.252021+0.6
3Gutsulyak, Nikolay1844RUS+13N=1B+10N+4B−2N+7B4.518.019.011.752008+23.4
4Ko Ko OhnFM2030MYA+11B+7N=2B−3N−1N+14B3.519.019.06.751829-10.1
5Siripatvanich, Nonglak1578THA−1N=6N+12B+9B+7N−2B3.517.019.07.751777+28.6
6Chongstitwattana, Cholapat1655THA=10N=5BF=7B+11N−1B2.515.515.56.001634-3.4
7Dumoulin, Peissone1654THA+15B−4B+13N=6N−5B−3N2.515.015.02.251553-30.4
8Yarkin, Veniamin1678RUS+14B−2N−1N=10B−9N+15B2.514.014.01.001078-35.6
9Nilkhumhaeng, Nilwadee1509THA−2BFF−5N+8B+12N2.012.512.54.501678+16.0
10Kaveevorayan, Nichakarn0THA=6B+11N−3B=8NFF2.011.511.54.5015950.0
11Yarkin, Ivan1419RUS−4N−10B+14NF−6B+13N2.09.09.01.0015720.0
12Rangkaew, Katunchalee1550THAFF−5N+13B+15N−9B2.06.56.51.001374-14.6
13Yarkin, Savely1416RUS−3B+15N−7B−12NF−11B1.011.011.00.00875-23.6
14FIDE 62148430—−8NF−11BFF−4N0.011.011.00.0010510.0
15FIDE 5220930100—−7N−13BFF−12B−8N0.010.010.00.007740.0

Key insights

Biggest movers and upsets — the story behind the numbers.

Top rating gainers
Top rating losers
Biggest upsets