Logic Masters Deutschland e.V.

Hello and welcome to my very first puzzle construction! This puzzle was inspired by my finishing a combinatorics course, and I learned lots about pandiagonal Latin Squares today while setting this! I'm quite proud of my first construction, and feel free to give me any feedback!! Constructive (no pun intended) criticism is appreciated! :]

Without further ado, here are the rules!:

- Normal Irregular sudoku rules apply: each row, column, and outlined region of the grid contain the digits 1–9 exactly once each.

- XV rule: An "X" between two cells means that that pair of cells must add to 10. a "V" means the pair must add to 5 (INCLUDES negative constraint!! All possible X's and V's are given).

- Anti-bishop rule: Within the gray 7x7 square in the grid, no digit can see another of itself diagonally (a "bishop's move" in chess). For example, a 6 in r5c5 means that there cannot be a 6 in r3c7, but there may be one in r1c9, which is outside of the square.

Fun fact: I've learned it's not possible to make a pandiagonal 9x9 Latin square, which is why the bishop constraint only applies to the middle of the grid!

Here you can solve the puzzle online:

Solve on f-puzzles

Solve on CTC app