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In this paper, we formulate a new local move on virtual knot diagram, calledarc shift move. Further, we extend it to another local move called region arcshift defined on a region of a virtual knot diagram. We establish that thesearc shift and region arc shift moves are unknotting operations by showing thatany virtual knot diagram can be turned into trivial knot using arc shift(region arc shift) moves. Based upon the arc shift move and region arc shiftmove, we define two virtual knot invariants, arc shift number and region arcshift number respectively.

Arc shift number and region arc shift number for virtual knots