Cross Sums(Kakuro)

After the popularity of Sudoku,a new game is about to become as popular as Kakuro.When Guardian,London changed its format to Berliner,it added a section called diversions in G2,the magazine section of the newspaper.It also started giving cross sums(american) or Kakuro(british) everyday in the same section.The first thing I noted was that it is much difficult than Sudoku,until I got the combinations that is .
Kakuro is somewhat like Sudoku(you have to fill 1-9 in the empty boxes),but the difference is that the numbers in a run should total to a sum printed either to the left or at the top of the run.
The technique to tackle Kakuro is little different.Since same numbers are not allowed in a run, you have the possible unique combinations.
For two spaces -16,17,4,3
For three spaces-6,7,24,23
For four spaces 10,11,29,30
For five spaces 15,16,34,35
For six spaces 21,22,38,39
The unique combinations like 4(3/1) helps to solve the puzzle.
For more information I suggest the wikipedia page again,but you can download the game
itself (free) from here