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Easy · Puzzle #454
6
2
1
7
5
8
4
2
9
3
9
8
2
3
7
8
1
6
2
3
2
5
2
1
4
8
3
4
1
5
6
7
3
9
8
5
2
1
3
6
9
7
8
X-Wing: if a digit appears in exactly two cells in two rows, and those cells share the same two columns, eliminate that digit from those columns elsewhere.
X-Wing: if a digit appears in exactly two cells in two rows, and those cells share the same two columns, eliminate that digit from those columns elsewhere.
"Beauty is the first test: there is no permanent place in the world for ugly mathematics." — G. H. Hardy
"Beauty is the first test: there is no permanent place in the world for ugly mathematics." — G. H. Hardy