Mumbai: International Master Himanshu Sharma of India stunned Russian Grand Master Vokarev Sergey to leapfrog into joint second position in the sixth round of the 7th Mumbai Mayor's International Open Chess Tournament today.

Sharma surprised GM Sergey by defeating him in Spanish Opening exchange variation. On the 13th move, Sergey played a bad move of Knight to add extra support to his Bishop, followed by another move of Queen. On the 32nd move, Sharma doubled his Rook on 7th rank, thus getting a winning advantage.