Rules:
Place the digits 1-9 in every row, column and irregular box.
Antiknight: cells separated by a knight's move in chess cannot contain the same digit.
Global Modulo-3: every 2x2 square of cells must contain a digit from (1,4,7), a digit from (2,5,8), and a digit from (3,6,9).
Global Non-consecutive: cells that are orthogonally adjacent cannot contain consecutive digits.
Little Killers: digits along marked diagonals sum to the number indicated outside the grid.
Parity: cells with a circle must contain an odd digit.
Love, Brigitte
Solution code: Row 1 from left to right (9 digits in total)
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