In February 2012, he tied for 1st–3rd with Mateusz Bartel and Pavel Eljanov in the 11th Aeroflot Open. Korobov took clear third place in the Ukrainian Championship of 2013, behind Yuriy Kryvoruchko and Ruslan Ponomariov respectively.
Korobov tied for first to third with Mateusz Bartel and Pavel Eljanov at the 11th Aeroflot Open in February 2012. He then secured clear third place in the Ukrainian Championship of 2013, surpassing Yuriy Kryvoruchko and Ruslan Ponomariov.