Logic Masters Deutschland e.V.

I started working on this puzzle after watching some chess games. I wanted to create a puzzle that contains all chess pieces, I hope you have fun.

Rules:

• Normal 9x9 Sudoku rules apply:
  Numbers from 1 to 9 must occur once in each row, column and 3x3 region.
• Additionally, in the grid 9 cages represent "Promotion" spots. Each spot promotes the digit it will contain to its marked chess piece. The constraint then applies to all equal digits in the grid.
  • The Q cage promotes all equal digits to Queens. Queens digits cannot appear on the same column, row or diagonal.
  • The K cage promotes all equal digits to Kings. Kings digits cannot touch orthogonally or diagonally.
  • The R cages promote all equal digits to Rooks. Rooks with the same digit cannot appear on the same row or column.
  • The B cages promote all equal digits to Bishops. Bishops with the same digit cannot appear on the same diagonal.
  • The N cages promote all equal digits to kNights. Knights with the same digit cannot appear in a cell 3x2 away from itself (in a chess knight move).
  • The P cage promotes all equal digits to Pawns. Pawns cannot appear in the 4 cells diagonal from itself.
• All cages contain a different number.
• Notes:
  Due to the nature of Sudoku constraints, some piece constraints could end up being identical and/or redundant.

Puzzle can be tried at f-puzzles here or CTC (includes solution check) here