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Solving Techniques 5
X-Wing

When we have this situation, in either case
1
  1
でも
  1
1
a 1 can’t be in the cells marked X below.

An actual example can be seen below. There is a [1,2] pair in D2, D4.
Also, in row B, a 1 is only possible in B2 or B4 (due to the 1’s in the other boxes). This makes entering a 1 in rows B and D and columns 2 and 4 impossible.

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In case there are 1’s in 9 places.

It is the same as above, but with 9 cells. In the cells marked X below, a 1 can’t be entered.

Names of cells in Sudoku

A1A2A3A4A5A6A7A8A9
B1B2B3B4B5B6B7B8B9
C1C2C3C4C5C6C7C8C9
D1D2D3D4D5D6D7D8D9
E1E2E3E4E5E6E7E8E9
F1F2F3F4F5F6F7F8F9
G1G2G3G4G5G6G7G8G9
H1H2H3H4H5H6H7H8H9
I1I2I3I4I5I6I7I8I9

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