6 ms·
The implication (not entirely clearly stated in the article) is that if a puzzle with n clues is solvable, a puzzle with n+1 clues is also solvable. Conversely
by kingatomic 15y ago
The implication (not entirely clearly stated in the article) is that if a puzzle with n clues is solvable, a puzzle with n+1 clues is also solvable.
Conversely, if a puzzle with n clues is unsolvable, any puzzle with n-1 clues is similarly unsolvable.