Jonathan Si Seng Ong

AUS · 16 yrs · K=40 · Peak 1827 (Nov 2025)

Best performance: 1897 at 2025 NSWCA October Weekender(Best of 2025)

World #=97594 live435#97,159 publishedAustralia #=645

OCT26 Rating

1738

Live Rating

1738.0

Change

0.0

Games Played

Rating History · Classical

Loading chart…

Classical games since the October list

No rated standard games this rating periodsince the OCT26 list (Oct 1, 2026)

	Last played	Score	TPR
	2026 New South Wales OpenJun 5 – Jun 8TPR 1835	2/5	1835

The live rating moves only when new rated games are played. Until then it matches the published rating.

Event timeline · Classical

25 events

Events before the current rating period show the performance, not a rating change.

Live events show the rating change; earlier events show the performance rating.

2026 New South Wales Open1835
Jun 2026Swisslichess
Best of 2026Score 2/5Opp avg 1907Start 1716
2026 Sydney International Open - Challengers1818
Apr 2026Swissfederation source
#2 in 2026Score 4/8Opp avg 1818Start 1645
2026 Australian Junior Championship U16 Open1624
Jan 2026Swissfederation source
#3 in 2026Score 4½/9Opp avg 1667Start 1827
2026 Australian Reserves1559
Jan 2026Swissfederation source
#4 in 2026Score 3½/10Opp avg 1717Start 1827
2025 NSWCA October Weekender1897
Oct 2025Swissfederation source
Best of 2025Score 3½/6Opp avg 1897Start 1802
2025 NSW Open1801
Jun 2025Swissfederation source
#5 in 2025Score 2½/5Opp avg 1801Start 1804
2025 Sydney International Open Challengers1829
Apr 2025Swissfederation source
#4 in 2025Score 5/9Opp avg 1786Start 1770
2025 O2C Doeberl Cup Major1783
Apr 2025Swissfederation source
#6 in 2025Score 3½/7Opp avg 1783Start 1770
2025 Norths Club Championship Tournament 3 Round 9—(1)
Feb – Apr 2025Swissfederation source
Score ½/1Opp avg 1724Start 1714
2025 Norths Club Championship Tournament 3 Rounds 5-81853
Feb – Mar 2025Swissfederation source
#2 in 2025Score 3/4Opp avg 1660Start 1714
2025 Norths Club Championship Tournament 3 Rounds 1-41836
Feb 2025Swissfederation source
#3 in 2025Score 3/4Opp avg 1643Start 1714
2025 Australian Junior Championship U16 Open1703
Jan 2025Swissfederation source
#7 in 2025Score 4½/9Opp avg 1775Start 1718
2024 JZMC Rising Stars Major1779
Dec 2024Round robinfederation source
Best of 2024Score 9/13Opp avg 1638Start 1577
2024 Sydney Open Chess Championship1673
Jul 2024Swissfederation source
#3 in 2024Score 3½/9Opp avg 1753Start 1584
2024 Gold Coast Open Major1438
Jun 2024Swissfederation source
#8 in 2024Score 3/7Opp avg 1587Start 1583
2024 NSW Open1523
Jun 2024Swissfederation source
#7 in 2024Score 1½/6Opp avg 1716Start 1583
2024 O2C Doeberl Cup Major1582
Mar – Apr 2024Swissfederation source
#5 in 2024Score 2/7Opp avg 1740Start 1700
2024 Norths Club Championship Tournament 4 Rounds 5-8—(1)
Feb – Mar 2024Swissfederation source
Score 0/1Opp avg 1315Start 1528
2024 JZMC March Weekender Division C1577
Mar 2024Individualfederation source
#6 in 2024Score 1½/4Opp avg 1664Start 1700
2024 Norths Club Championship Tournament 4 Rounds 1-41342
Feb 2024Swissfederation source
#9 in 2024Score 1½/3Opp avg 1342Start 1528
2024 Australian Junior Championship U16 Open1680
Jan 2024Swissfederation source
#2 in 2024Score 5/9Opp avg 1407Start 1430
2024 Classic Major1587
Jan 2024Swissfederation source
#4 in 2024Score 5/11Opp avg 1544Start 1430
2023 Vikings Minor1548
Nov 2023Swissfederation source
Best of 2023Score 3½/5Opp avg 1399Start 1386
2023 John Purdy Memorial Major Rounds 6-91452
Aug – Oct 2023Swissfederation source
#2 in 2023Score 1½/4Opp avg 1539Start 1351
2023 John Purdy Memorial Major Rounds 2-51418
Aug – Sep 2023Swissfederation source
#3 in 2023Score 1½/4Opp avg 1505Start 1351

Rated near Jonathan Si Seng Ong · Classical

World

#=97594Alan Wolstencroft1738.0
#=97594Vlastimil Oharek1738.0
#=97594Jonathan Si Seng Ong1738.0
#=97594WCMZara Majid1738.0
#=97594Cristian Chura Gonzales1738.0

Australia

#=645WCMSarah Anton1738.0
#=645Alan Wolstencroft1738.0
#=645Jonathan Si Seng Ong1738.0
#=648Daniel Zhang1737.0
#=648William Cameron1737.0

Live ratings projected from the OCT26 published list · Not affiliated with FIDE