Logic Masters Deutschland e.V.

This is a fun mash-up of two extremely innovative and elegant parity related rule-sets that I have been playing around with recently. If you have done my previous few puzzles, this should be a relatively breezy solve but the logic flows very nicely regardless.

Normal sudoku rules apply.

White go stones: if a single white stone is on a corner of a cell, the digit in the cell is the number of digits with the same parity as itself in the diagonal beyond the white stone.

Black go stones: if a single black stone is on a corner of a cell, the digit in the cell is the number of digits with the opposite parity from itself in the diagonal beyond the black stone.

Adding stones: If multiple stones are on the corners of a cell, the digit in the cell is the sum of the values computed as above for each stone.

The twist: In this puzzle, the colors of the go stones are hidden. You must determine what color each stone must be

Parity counting circles: Circled digits indicate how many of the up to 9 cells surrounding the circle (including itself) have the same parity as itself. Not all such circles are necessarily given.

If you liked the logic of the parity counting circles and want a puzzle that focuses solely on that mechanic, you should check out my series of puzzles that each develop a subtle variation on exploring this idea: Parity Hilarity, Parity Peculiarity, Parity Singularity, Parity Clarity, and Parity Polarity.

If instead, you liked the idea of the go stones, check out my latest puzzle Going in Circles or sfushidahardy's original go-themed puzzle that inspired mine Godoku.