Sudoku #2808

Complexity: Hard

 Fun Fact About Sudoku
The first jigsaw puzzle was created in 1767 when John Spilsbury, an English cartographer, chopped up a wooden map of Britain and challenged the public to reassemble it. He called it a "dissected puzzle."

Enter numbers into the empty cells so that each row, column and 3x3 box contains the numbers 1 to 9.

7 1 9 4 5 3
1 4 8
4 5 3 2 7 1
3 6 2 8 5
4 5 1
6 4 1 7 3
3 9 7 4 6 2
6 3 4
5 4 8 6 1 3