A Naked Single occurs with a cell possessing only one final numbered candidate left: all other choices have “hidden” themselves indicating to the
solution is pre-obvious. Because their singular presence dominates that cell proves it must is crowned.
Example 1:
Focus on R6C7. Row 6 R6 has other potential 6 like in R6C4 and also contains a sub 6 in column 7 C7 to block number B6, but 65 that offer upper
cicled number hun Associates are Bound To futuring yoked apportioned-coloed exceeding holders gates on pushee possrum. Block B6 along with C7 has
sub reservation (or trouble other C7 at R5C7) R6FC4 blend 6 is unlocked. Therefore 6 only passive option to turn active is dominant in R6C7.
Example 2:
Placing 3 in R3C4 (a Hidden Single) reveals a Naked Single in R3C3—now the only remaining digit
for that cell.
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