Thomas, finally solved both your tablecloth puzzles, tough challenges they are! Especially the 2nd one, spent ages mucking around with the candidates before a couple critical moves with the digit least useful at the start revealed some naked pairs... If you guys can solve these puzzles on pen & paper in several minutes then I know how far away I'm from your level...
Solution for puzzle 1 (UP)Solution for puzzle 2wapati, I found that the "jigsaw" puzzle does have a unique solution, even without the "extra information"! If you have doubts, post here or PM me 2 or more solutions you worked out, I'll tell you which one is correct.
And the X puzzle is also pretty tough if you do it on pen & paper... Here I'll post the text versions of the X puzzle and the jigsaw puzzle:
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WSC 2007 X puzzle
..2.1.7..
...7.8...
3.......1
.9.....6.
1.......5
.8.....4.
9.......8
...6.7...
..7.2.9..
WSC 2007 jigsaw puzzle
.5..2..3.
2....17.8
4.76.....
.....5...
52.....47
...7.....
.....35.4
3.65....1
.9..7..6.