Two Step Maze (465)

Find a way from the cell with S (as Start) to the cell with F (as Finish). The path can only pass vertically or horizontally through the centres of some squares. Along your way, you may not enter any cell twice, and you may never make more than two consecutive steps in the same direction (you may pass straight through 3 cells at most). The way should not pass through the bold borders.

Reference: WPC 2016 (65)