Rules -- Fencing Match

Fencing Match was invented by the Japanese puzzle company Nikoli (under the name Slitherlink).

1. Draw a single loop that connects the dots on the grid. The loop may only travel horizontally or vertically, and never diagonally (so all turns are of 90 degrees). The loop may only turn at the dots. The loop may not cross itself or branch off; in other words, the interior of the loop will be a single polygon.
2. All numbers inside the grid indicate how many of the four edges of the imaginary square surrounding the number are in the loop.