![HoDoKu: Solving Techniques - Single Digit Patterns (Skyscraper, 2-String-Kite, Turbot Fish, Empty Rectangle) HoDoKu: Solving Techniques - Single Digit Patterns (Skyscraper, 2-String-Kite, Turbot Fish, Empty Rectangle)](https://hodoku.sourceforge.net/examples/er01.png)
HoDoKu: Solving Techniques - Single Digit Patterns (Skyscraper, 2-String-Kite, Turbot Fish, Empty Rectangle)
![An example Sudoku grid in reduced form and a sudoku grid isomorphic to it. | Download Scientific Diagram An example Sudoku grid in reduced form and a sudoku grid isomorphic to it. | Download Scientific Diagram](https://www.researchgate.net/publication/258387013/figure/fig2/AS:325026499842052@1454503764223/An-example-Sudoku-grid-in-reduced-form-and-a-sudoku-grid-isomorphic-to-it.png)
An example Sudoku grid in reduced form and a sudoku grid isomorphic to it. | Download Scientific Diagram
![Help, I couldn't crack this sudoku and my solver suggested 'simple contradiction'. It wanted my to 'guess' the 5 in r4c2. Does anyone see another way or is this sudoku just that Help, I couldn't crack this sudoku and my solver suggested 'simple contradiction'. It wanted my to 'guess' the 5 in r4c2. Does anyone see another way or is this sudoku just that](https://preview.redd.it/4v28l5v2w0c91.jpg?width=640&crop=smart&auto=webp&s=21f4b3daa57c31c11d198a4fb565678c863cd5d9)
Help, I couldn't crack this sudoku and my solver suggested 'simple contradiction'. It wanted my to 'guess' the 5 in r4c2. Does anyone see another way or is this sudoku just that
![HoDoKu: Solving Techniques - Single Digit Patterns (Skyscraper, 2-String-Kite, Turbot Fish, Empty Rectangle) HoDoKu: Solving Techniques - Single Digit Patterns (Skyscraper, 2-String-Kite, Turbot Fish, Empty Rectangle)](https://hodoku.sourceforge.net/examples/d2sk02.png)
HoDoKu: Solving Techniques - Single Digit Patterns (Skyscraper, 2-String-Kite, Turbot Fish, Empty Rectangle)
![HoDoKu: Solving Techniques - Single Digit Patterns (Skyscraper, 2-String-Kite, Turbot Fish, Empty Rectangle) HoDoKu: Solving Techniques - Single Digit Patterns (Skyscraper, 2-String-Kite, Turbot Fish, Empty Rectangle)](https://hodoku.sourceforge.net/examples/sk01.png)