Let's construct a 10x10 grid. 0n the 100 squares you are allowed to place 7 bases (the red dots in the diagram below) in any square on the grid. Then you fill the grid with skinny trominoes. The trominoes have to cover all the squares except the squares which contain a base. Next, construct a continuous trail (the red line on the diagram below) which passes through all 7 bases. The trail is not allowed to cut any of the trominoes and is allowed to pass through each square only one time. Also, the trail is allowed to make only one angle within each square. What is the maximum number of squares through which the trail can pass? Below is an example.