Unique {0} type 3 (with Naked {7})
The cells {3} form a Unique {0} on the values
{1} and {2}. There are exactly two ways of placing
the values {1} and {2} in the cells of the
Unique {0}, forming two possible configurations.
In both configurations, each row, column or box touched by the Unique
{0} contains each of the two values {1} and {2}
exactly once. As a result, if one of these two configurations were part of the
solution, it could then be replaced by the other one to get a second valid
solution.
Because a valid sudoku cannot have more than one solution, none of the two
configurations of the Unique {0} can be valid. This implies that either
{4} or {5} contains one of the values
{6}. It follows that either {4} or {5}
forms a Naked {7} with {8} on the values {9} in the
{10}.
Other possible positions of the values {9} can therefore be removed from the
{10}.