Trial and Error (Guessing)

Understanding the Concept

Not a preferred technique, but sometimes necessary for extreme puzzles.

Choose a cell with few candidates (preferably 2).

Assume one value and follow logical consequences.

If you reach a contradiction, that value is wrong.

If no contradiction, you might need to guess again deeper.

Systematic approach: always backtrack properly.

Some call this "bifurcation" or "what-if analysis".

Purists avoid it, but it's a valid solving method.

Pro Tips

• •Only use when all logical techniques are exhausted
• •Start with bi-value cells
• •Keep careful track of your assumptions
• •Be ready to backtrack completely
• •Consider if you missed an easier technique first
• •Practice logical techniques to minimize guessing need