Ong, Jonathan Si SengFIDE ID 324941712Games1Wins1Draws5Losses13%ScorePeak rating1892Latest rating1826First seenApr 21, 2024Last seenJan 18, 2026Recent gamesDateWhiteResultBlackEventOpeningJan 18, 2026Ong0–1Peramunetilleke2026 Australian Championship Under 18 yearsFour Knights Game: Scotch Variation AcceptedJul 10, 2024Wang1–0OngRound 10: Wang, Justin Zhide - Ong, Jonathan Si SengFrench Defense: Exchange VariationJul 10, 2024Ong0–1NgRound 9: Ong, Jonathan Si Seng - Ng, CliveSicilian Defense: Lasker-Pelikan Variation, Retreat VariationJul 10, 2024Ottley0–1OngRound 8: Ottley, Matthew - Ong, Jonathan Si SengSemi-Slav Defense: Main LineJul 10, 2024Young½–½OngRound 6: Young, Micah - Ong, Jonathan Si SengFrench Defense: Tarrasch Variation, Open SystemApr 21, 2024Ong*NguyenRound 6: Ong, Jonathan Si Seng - Nguyen, Kevin?Apr 21, 2024Yuan Huang*OngRound 5: Yuan Huang - Ong, Jonathan Si Seng?Apr 21, 2024Ong*WongRound 4: Ong, Jonathan Si Seng - Wong, Benjamin?Apr 21, 2024Chakrabarty1–0OngRound 3: Chakrabarty, Reyaansh - Ong, Jonathan Si SengFrench Defense: Exchange VariationApr 21, 2024Ong*ShoshoRound 2: Ong, Jonathan Si Seng - Shosho, David?Apr 21, 2024Nabung*OngRound 1: Nabung, Christian - Ong, Jonathan Si Seng?—Ong0–1Smirnov2025 Sydney International Open BlitzNimzowitsch Defense: Scandinavian Variation, Exchange Variation
