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Techniques · Hard
2-String Kite
A digit has exactly two places in a row and exactly two places in a column, and one end of each sits in the same box. Those two ends cannot both hold the digit, so one of the far ends does. A cell that sees both far ends cannot have the digit.
How to spot it
Find a row and a column where the digit has two places each, with one cell of each in a shared box. The target is usually the cell where the far ends' row and column cross.
Example
6
9
1
3
5
8
2
4
7
27
8
479
1
479
5
6
39
4
37
5
79
2
6
1
39
8
5
6
9
24
3
24
7
8
1
1
8
7
6
9
5
3
2
4
23
4
23
8
7
1
9
5
6
37
5
6
179
4
79
8
1379
2
8
1
23
5
6
279
4
379
39
9
27
4
127
8
3
6
17
5
7 has exactly two places in row 3 (r3c2 and r3c4) and in column 1 (r2c1 and r7c1), linked in box 1, so r3c4 or r7c1 must be 7 and 7 can be removed from cells that see both (2-String Kite).
the pattern cells that lose a candidate (crossed out)