Oslo, May 30 -- Reigning world champion Gukesh spent his last day as a teenager, sitting across from Magnus Carlsen and being reminded that over-ambition in chess can come at a cost. There was no reprise of last year's infamous table slam. Instead, Gukesh ended up putting too much on the line and the world No. 1 got his first classical win in Round 4 of Norway Chess on Thursday, after two losses in three games. Carlsen's first trip to the confessional was about being surprised by his own move - 6.Qd6! - activating the Queen and perhaps trying to take the young Indian out of book. A few moves down the line Gukesh had a surprise waiting for Carlsen with 9. Nb5. Carlsen, playing with the Black pieces, took a slightly perilous path and went on to double his pawns on the f-file. Gukesh captured Black's dark-squared bishop with his b-pawn, weakening the security cordon around his King. Black, helped by White's eagerness to take risks, went on to find inroads with its Queen and light-squared bishop putting the enemy King under duress. Gukesh resigned after 42 moves. "Gukesh sometimes plays a bit too ambitiously. He wanted to prove a serious advantage today, which I'm not sure there was. Eventually, he played himself into some trouble. And I took over, more and more," Carlsen said. Wesley So managed to stop Alireza Firouzja's run in the Armageddon while R Praggnanandhaa moved to sole second with a win over Vincent Keymer in the Armageddon....