Logic Masters Deutschland e.V.

I noticed that in the nerd snipes website, double arrow are not yet included, perhaps we should fill in that section this year!

Normal sudoku rules apply.

Double Arrow: The sum of the two endpoint circles must equal the sum of the digits along the connecting line.

CTC Link

Puzzle:

With allowing 1 diagonal DA, I got 16 circles by using 19 double arrows. What is the lowest possible number?