Logic Masters Deutschland e.V.

Finally created a Sudoku with a pure empty face. This is a variant of regular sudoku.
Regular Sudoku rules apply:
Each row, column, and 2×4 box contain numbers 1~8.
Coordinate Cell RuIes：
Each row, column, and box has only one cell called "Coordinate Cell" abbreviated as "C-cell". The c-cells including a set of 1~8. If another cell equals to c-cell, then in a coordinate system with the c-cell as the origin and rows and columns as the axes, the digits of the projected positions corresponding to that cell are equal. As shown in the following figure:

Eight Queens Rules:
These eight C-cells cannot see each other in the same row, column, or diagonal.
Column and Row Indexer Rules:
The digits in first row/column show the position of the c-cell on that column/row.As shown in the above figure. If you interested in the C-cell rule, you can try my previous puzzle:

Try previous puzzle.

Main Puzzle:

CTC link. Have fun solving!