Logic Masters Deutschland e.V.

A chess problem on a Sudoku grid. Normal Sudoku rules, plus killer cage (cells in the cage add to the small number in the cage corner), XV (numbers beside an X add to 10, beside a V add to 5), thermo (numbers increase from the bulb end, say 2, 5, 7), and one diagonal constraint (the green line is one set of 1-9). Note that the double ended thermo in boxes 5 and 7 is partially obscured by the green line. There are no negative constraints. . All given digits and cage totals indicate a chess piece on an extended 9x9 chessboard. Black pieces are numbered 1-9 and corresponding White pieces are 10 higher (if 5 is a black queen, 15 is a white queen). White to move and mate in 3. The first piece to move will land orthogonally adjacent to a cell that differs by exactly 5 from the piece's starting cell.F-puzzles