dobrichev wrote:This is very informative statement for those who know what 12C (CF) puzzles and 10C pool grids means.

Apologies!

- CF grids are grids in canonical form. Using blue's canonicalisation functions we map any SudokuP grid to one of the 53,666,689 different canonical form grids. The 8-digit grid #'s you sometimes see grids/puzzles tagged with are the position of the CF in the ordered list of all CF grids (aka CFI = CF Index).

- 12C CF puzzles are 12-clue SudokuP puzzles in canonical form. They have a unique solution which is a CF grid. Using blue's CF function we can take any 12-clue puzzle and convert it to CF, by passing the puzzle + solution to the function, which converts the solution to CF and applies the same transformations to the puzzle. Our "12C puzzle catalog" is all the different 12C CF puzzles we have collected.

- 10C Pool Grids are the 611,502 CF grids which were remaining after the 10-clue Search project had eliminated all CF grids with provable MNC (Minimum Number of Clues) greater than 10. This is not the MCP (minimum clues in a puzzle), but a lower bound obtained by UA/HSet analysis. These are only "10C" in the sense that they are the remaining candidates, the only grids that could possibly have 10C puzzles.