# Can diabolical Sudoku be solved without guessing?

## Can diabolical Sudoku be solved without guessing?

The immediate answer is no. Any valid Sudoku can be solved without guessing, just by exhaustively trying all possibilities. However, there are two interesting variant interpretations of the question: Are there Sudoku puzzles that can’t be solved logically?

## What is a diabolical puzzle?

The diabolical cube is a three-dimensional dissection puzzle consisting of six polycubes (shapes formed by gluing cubes together face to face) that can be assembled together to form a single 3 × 3 × 3 cube.

Do some Sudoku puzzles require guessing?

Sudoku does not require guessing. In fact, when solving Sudoku puzzles, you’re better off NOT guessing at all. Sudoku is a logic puzzle, using the power of simple deductive reasoning and process of elimination to fill in the gaps in the grid. Simply put – you don’t need luck to play Sudoku.

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### Where can I find information on sudoku puzzles?

Links to these pages are found to the right, under Sudoku Techniques. The information on the following blog pages is required to understand this page: Forbidding Chains 102 The Practice to understand the puzzle markings.

When was the final proof of the tough Sudoku?

The following is the final page of an illustrated proof for the Tough Sudoku of February 20, 2007 . You may need to refer to previous blog pages to understand this proof.

#### What kind of chains are used in Sudoku?

There are many ways to tackle this one. The primary focus of this proof is to illustrate using Forbidding Chains, also called Alternating Inference Chains or AIC . Some of the Chains that are presented are complex forbidding chains – or advanced forbidding chains .