This same process can be applied to a value in a box that is contained in a single column.

The value 1 has to be placed in one of the blue cells in box 1 so it cannot be placed anywhere else in row 1.

Any instances of the value 1 in row 1 that are not in box 1 can be removed.

The value 4 has to be placed in one of the blue cells in box 7 so it cannot be placed anywhere else in column 3.

Any instances of the value 4 in column 3 that are not in box 7 can be removed.If all possible candidate locations for a given value in a given row are contained in a single box, that row can be said to claim the given value. All candidate instances of the given value in the box that are not in the given row can be removed.

This same process can be applied to a given value is a given column that is contained in a single box.

The value 9 has to be placed in one of the blue cells in row 3 so it cannot be placed anywhere else in box 2.

Any instances of the value 9 in box 2 that are not in row 3 can be removed.

The value 7 has to be placed in one of the blue cells in column 5 so it cannot be placed anywhere else in box 2.

Any instances of the value 7 in box 2 that are not in column 5 can be removed.

19 October 2020

by Don

by Don

RE: Comments and feedback for claiming

Most people that I know refer to this 'Claiming' method as 'Locked Candidates'.

Most people that I know refer to this 'Claiming' method as 'Locked Candidates'.

13 September 2014

by John

by John

RE: Comments and feedback for claiming

Thanks for using the site. Good luck with your Sudoku solving

Thanks for using the site. Good luck with your Sudoku solving

13 September 2014

by Armando Ramos,London

by Armando Ramos,London

RE: Comments and feedback for claiming

your examples 1,2 and 3,clearly made me aware of the importance of removals. Many thanks

your examples 1,2 and 3,clearly made me aware of the importance of removals. Many thanks

Sudoku Rules and Techniques

Sudoku Rules

Acknowledgments

I would like to acknowledge these sites referenced for strategy ideas and solving techniques.

SudokuWiki.Org by Andrew Stuart

PaulsPages.co.uk by Paul Stevens

Sudoku Rules

Cross Hatching

Counting

Naked Set

Hidden Set

Claiming

Remote Pairs

X Wing

XY Wing

Simple Coloring

Fishy Things

Unique Rectangle

X Chain

Aligned Pair Exclusion

Forcing Chains

Finned Fishy Things

Almost Locked Sets

Counting

Naked Set

Hidden Set

Claiming

Remote Pairs

X Wing

XY Wing

Simple Coloring

Fishy Things

Unique Rectangle

X Chain

Aligned Pair Exclusion

Forcing Chains

Finned Fishy Things

Almost Locked Sets

Acknowledgments

I would like to acknowledge these sites referenced for strategy ideas and solving techniques.

SudokuWiki.Org by Andrew Stuart

PaulsPages.co.uk by Paul Stevens