The minimum number of clues for a Sudoku-X has been 13 for the last two years. This weekend, I started a search for more 13's and possibly a 12.
Here's a 12 I found this morning.
000000009050000010000005000000000060000007000000004000000100000000920000004000008
I will start a new page on the main site, where I will explain my search techniques and post a list of additional 12-clue Sudoku-X puzzles I found later today.
Ruud
First 12 Clue Sudoku-X
First 12 Clue Sudoku-X
“If the human brain were so simple that we could understand it, we would be so simple that we couldn't.” - Emerson M Pugh