What is the Skyscraper technique in sudoku?

A Skyscraper is a sudoku with clues along its sides. In each row and column the number of visible skyscrapers, as viewed from the direction of each clue, is equal to the value of the clue. So higher skyscrapers block the view of lower skyscrapers.

Is there a technique to Sudoku?

The easiest way starting a Sudoku puzzle is to scan rows and columns within each triple-box area, eliminating numbers or squares and finding situations where only a single number can fit into a single square. The scanning technique is fast and usually sufficient to solve easy puzzles all the way to the end.

What is an empty rectangle in Sudoku?

Empty Rectangles in Boxes Empty Rectangles constitute a clever but obscure strategy for Sudoku. An Empty Rectangle occurs within a box where four cells form a rectangle which does NOT contain a certain candidate. Each of these theoretical rectangles is independent of the others.

Where does the base of a skyscraper go in Sudoku?

If the skyscraper is oriented 90 degrees clockwise or counter-clockwise, then the base will be running parallel to the left or right side of your puzzle grid, which means that your roof tops will sight each other across columns.

Which is the correct way to solve a skyscraper puzzle?

A basic technique to solve Skyscrapers Puzzle is to decide places of number 4 first. Now we focus on row 4. By rule 1, we can place number 4 in row 4 exactly once. Moreover, we can see only one building if a building with height 4 is in front. From these, we know that box– (4,1) is the only box in which we can place a number 4.

What are the rules for the game skyscrapers?

The rulesare simple. The objective is to place skyscrapers in all cells on the grid according to the rules: – The height of the skyscrapers is from 1 to the size of the grid i.e. 1 to 4 for a 4×4 puzzle. – You cannot have two skyscrapers with the same height on the same row or column.

How to calculate the height of a skyscraper?

– The height of the skyscrapers is from 1 to the size of the grid i.e. 1 to 4 for a 4×4 puzzle. – You cannot have two skyscrapers with the same height on the same row or column. – The numbers on the sides of the grid indicate how many skyscrapers would you see if you look in the direction of the arrow.