.

I have found a 9-clue

SudokuWX (WindokuX) puzzle:

- Code: Select all
` +-------+-------+-------+`

| . . . | . . . | . 8 . |

| . . . | . 7 . | . . . |

| . . . | . . . | . 5 . |

+-------+-------+-------+

| . . . | 3 . . | . . . |

| . 6 . | . . . | . . . |

| . . . | . . 4 | . 2 . |

+-------+-------+-------+

| . . . | . . . | . . . |

| . . . | . . . | . . 1 |

| 7 . . | . . . | . . . |

+-------+-------+-------+

I hope that

tarek and other pencil-solvers have fun with this one!

I had thought that, since every 10-clue case found by the morph-walker so far is minimal, that 9-clue puzzles might be rare or non-existent, but these were found by checking morphs of the 10-clue puzzles, eg {-2, +1}. So 8-clue puzzles cannot be ruled out by any stretch!

Here are the first 5 x 9-clue puzzles found:

- Code: Select all
`.......8.....7...........5....3......6............4.2..................17........: 123456789456879312897132456942318675368725194571694823685241937234987561719563248`

....................8...........7.........4.....5........8...32..........69......: 123456789457298361698371245214687593785139426936542817571864932342915678869723154

.......8.....7...........5....3......6............4.2.........7........1.........: 123456789456879312897132456942318675368725194571694823685241937234987561719563248

..3......4.......2...1...65...2...........9.....................7................: 123456789456789312789132465634298571817564923592317648345621897971845236268973154

..3......4...........1.2.65...2...........9.....................7................: 123456789456789312789132465634298571817564923592317648345621897971845236268973154