wolf vs sheep lite

wolf vs goat war last for thousands of years on the grassland,now goat evolve to to a more intelligent,who will win ? slip to select and move the sheep or wolf.
-Player vs computer
-Player vs Player through through one computer
-Player vs Player over wifi or bluetooth

mode:
-2 wolfs vs 15 sheep
-3 wolfs vs 20 sheep
rule:
-move: the cell is null ,can move one step.
-eat:if the sheep is next to wolf and the other side cell is null,the wolf can eat the sheep.
-win:the sheep win only if wolfs cannot move or eat;
the wolfs win only if all sheep is ate.