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Expert · Puzzle #910
1
4
9
4
6
1
5
3
3
1
5
9
1
6
7
2
8
4
9
3
5
1
8
7
4
2
"Give me six hours to chop down a tree and I will spend the first four sharpening the axe." — Abraham Lincoln
"Give me six hours to chop down a tree and I will spend the first four sharpening the axe." — Abraham Lincoln
Can you identify the technique needed to make the next move before filling in any digit? Name it, then use it.
Can you identify the technique needed to make the next move before filling in any digit? Name it, then use it.