Full Masyu (449)

Shade some cells and draw a Masyu loop through the remaining cells to get a valid Masyu solution:
Shade some cells in the grid. Then, draw a single loop that travels horizontally and vertically between cell centers and passes through each circle. The loop must go straight through white circles, but must turn in at least one of the adjacent cells. The loop must turn in the black circles and go straight through both following cells. The loop cannot pass through the shaded cells.

Reference: WPC 2016 (65)