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OJ

Ong, Jonathan Si Seng

🇦🇺

FIDEFIDE 3249417· Male· Australia· Born in 2010

Follow Jonathan Si Seng OngTrack his monthly FIDE ratings, games, tournaments and more.

Jonathan Si Seng Ong, a 16-year-old Australian player, is rated 1716. He has slipped back 88 Elo over the past 12 months. 33 rated games in the past year (≈49/year long-term). Recent standard appearances include 2026 Sydney International Open - Challengers, 2026 Australian Junior Championship U16 Open, and 2026 Australian Reserves. Also played 4 blitz events (including 2026 Australian Blitz Championship) recently. His peak of 1827 was reached at age 15 (Nov 2025).

At junior level, he reached #35, #29 and #55 nationally in U16, U14 and U12.

Current rating

1716

Standard

Rpd1817·Blz1900

All-time high

1827

−111 pts below
Nov 2025 · age 15

Activity

52

games / yr avg. · ≈4/mo

33 past 12 mo · ≈3/mo
classical only
Active

Signature stat

#103,963

#103,963 · players worldwide · of 216,808

Career timeline

11 entries
2026
35th Australian U16 player
at age 16 · rated 1827
Jan 2026
2025
All-time peak 1827
at age 15 · −111 from today
Nov 2025
Crossed 1800
at age 15
May 2025
Re-crossed 1600
at age 15
Jan 2025
2024
Best 12-month gain (+351 Elo)
1297 → 1648
Apr 2024
Crossed 1600
at age 14
Mar 2024

Standard rating history

Last 12 months — activity & highlights

Best result
2025 NSWCA October Weekender
perf 2043 (+216) · 3.5/5 · #67
Top opponent
vs Ethan Chang 2,058
2025 NSW Open · Jun 2025 · +12.5 Elo
Evolution
-88
1804 → 1716
Tournaments
5
38 games
Score
18/ 3847.4%
11W14D13L
Top 3 losses
1.[L]vsNicholas Yuileng Chen1,604·2025 NSW Open·R3·-30.3
2.[L]vsHarvey Kuncoro1,613·2026 Australian Reserves·R9·-21.8
3.[L]vsLinda (Zhiling) QianWCM1,681·2026 Australian Reserves·R8·-17.9

Last 12 months — tournaments

5 events
EventDateScoreRankPerfΔ Elo
2026 Sydney International Open - Challengers
Open Swiss
Apr 20264/8#191817+71.2
2026 Australian Junior Championship U16 Open
Swiss
Jan 20264.5/8#131721-82.0
2026 Australian Reserves
Open Swiss
Jan 20263.5/7#881717-98.8
2025 NSWCA October Weekender
Open Swiss
Oct 20253.5/5#672043+26.0
2025 NSW Open
Open Swiss
Jun 20252.5/5#751801-1.6
Worst Elo result: 2026 Australian Reserves (-98.8 Elo, finished #88).

Rankings

/
Australia
#678
out of 2,392 players
Asia-Pacific
#13,832
in continent
World
#103,961
out of 400,000+

National ranking

Europe & World

Europe
World
Australia
1
🇦🇺Cheng, BobbyFollow Bobby ChengTrack their monthly FIDE ratings, games, tournaments and more.
2,571
2
🇦🇺Kuybokarov, TemurFollow Temur KuybokarovTrack their monthly FIDE ratings, games, tournaments and more.
2,534
3
🇦🇺Tan, JustinFollow Justin TanTrack their monthly FIDE ratings, games, tournaments and more.
2,510
4
🇦🇺Sardana, RishiFollow Rishi SardanaTrack their monthly FIDE ratings, games, tournaments and more.
2,496
5
🇦🇺Smerdon, David CFollow David C SmerdonTrack their monthly FIDE ratings, games, tournaments and more.
2,476
6
🇦🇺Morris, JamesFollow James MorrisTrack their monthly FIDE ratings, games, tournaments and more.
2,423
7
🇦🇺Zhao, Zong-YuanFollow Zong-Yuan ZhaoTrack their monthly FIDE ratings, games, tournaments and more.
2,415
8
🇦🇺Liu, YiFollow Yi LiuTrack their monthly FIDE ratings, games, tournaments and more.
2,401
9
🇦🇺McClymont, BrodieFollow Brodie McClymontTrack their monthly FIDE ratings, games, tournaments and more.
2,389
10
🇦🇺Bjelobrk, IgorFollow Igor BjelobrkTrack their monthly FIDE ratings, games, tournaments and more.
2,380
...
678🇦🇺Ong, Jonathan Si Seng1,716
Asia-Pacific
1
🇺🇿Abdusattorov, NodirbekFollow Nodirbek AbdusattorovTrack their monthly FIDE ratings, games, tournaments and more.
2,780
2
🇺🇿Sindarov, JavokhirFollow Javokhir SindarovTrack their monthly FIDE ratings, games, tournaments and more.
2,776
3
🇨🇳Wei, YiFollow Yi WeiTrack their monthly FIDE ratings, games, tournaments and more.
2,753
4
🇮🇳Erigaisi ArjunFollow Erigaisi ArjunTrack their monthly FIDE ratings, games, tournaments and more.
2,751
5
🇮🇳Anand, ViswanathanFollow Viswanathan AnandTrack their monthly FIDE ratings, games, tournaments and more.
2,739
6
🇨🇳Ding, LirenFollow Liren DingTrack their monthly FIDE ratings, games, tournaments and more.
2,738
7
🇮🇳Praggnanandhaa RFollow Praggnanandhaa RTrack their monthly FIDE ratings, games, tournaments and more.
2,733
8
🇮🇳Gukesh DFollow Gukesh DTrack their monthly FIDE ratings, games, tournaments and more.
2,732
9
🇻🇳Le, Quang LiemFollow Quang Liem LeTrack their monthly FIDE ratings, games, tournaments and more.
2,731
10
🇷🇺Nepomniachtchi, IanFollow Ian NepomniachtchiTrack their monthly FIDE ratings, games, tournaments and more.
2,729
...
13832🇦🇺Ong, Jonathan Si Seng1,716
World
1
🇳🇴Carlsen, MagnusFollow Magnus CarlsenTrack their monthly FIDE ratings, games, tournaments and more.
2,840
2
🇺🇸Nakamura, HikaruFollow Hikaru NakamuraTrack their monthly FIDE ratings, games, tournaments and more.
2,792
3
🇺🇸Caruana, FabianoFollow Fabiano CaruanaTrack their monthly FIDE ratings, games, tournaments and more.
2,788
4
🇺🇿Abdusattorov, NodirbekFollow Nodirbek AbdusattorovTrack their monthly FIDE ratings, games, tournaments and more.
2,780
5
🇺🇿Sindarov, JavokhirFollow Javokhir SindarovTrack their monthly FIDE ratings, games, tournaments and more.
2,776
6
🇳🇱Giri, AnishFollow Anish GiriTrack their monthly FIDE ratings, games, tournaments and more.
2,767
7
🇩🇪Keymer, VincentFollow Vincent KeymerTrack their monthly FIDE ratings, games, tournaments and more.
2,759
7
🇫🇷Firouzja, AlirezaFollow Alireza FirouzjaTrack their monthly FIDE ratings, games, tournaments and more.
2,759
9
🇺🇸So, WesleyFollow Wesley SoTrack their monthly FIDE ratings, games, tournaments and more.
2,754
10
🇨🇳Wei, YiFollow Yi WeiTrack their monthly FIDE ratings, games, tournaments and more.
2,753
...
103961🇦🇺Ong, Jonathan Si Seng1,716