SudokuDP is standard Sudoku with the additional constraint that no Diagonal-Pair (two cells diagonally adjacent) can have the same value.

I've seen this referred to as "Anti-King" Sudoku, but generally it seems to have been largely ignored. That's a shame, because it is a simple variation, it uses the standard presentation (like SudokuP). It's a bit tricky from an analytical perspective (I'll discuss this in a later post), and should yield good puzzles for P & P solvers.

It also can be used in place of the "X" variant, so we can have SudokuP-DP and SudokuW-DP puzzles to complement the SudokuP/PX and SudokuW/WX (Windoku) variants.

In fact we now have 4 variants for each category (Sudoku, SudokuP, SudokuW) since the DP and X variants can be applied together.

Here is a 14-clue example of a standard SudokuDP puzzle.

Puzzle image:

**Hidden Text:**Show

Solution:

**Hidden Text:**Show

Puzzle text:

- Code: Select all
`2.......8.......3..9.7.....7......4.......3.....5.............2..8..4.......13...`