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The pink cells. Starts at A, which induces removal of candidates in B and C. B induces D. C induces E. E induces F and G. F induces H. G induces I and J. J induces K and L. K induces M and N. N induces O. B and O induces P. D and P induces Q. Q induces R. R induces S. S induces T.

The pink cells. Starts at A, which induces removal of candidates in B and C. B induces D. C induces E. E induces F and G. F induces H. G induces I and J. J induces K and L. K induces M and N. N induces O. B and O induces P. D and P induces Q. Q induces R. R induces S. S induces T.

In the 1st row, all the red candidates are in the same A region (pink squares), and only one of them is true. This means that the second red square in this region must be only in the 2nd row (cyan cells). The second red in the 2nd row then must be one of the last two cells (lime cells) because those are in another B region. The 3rd row must also have a second red in the B region (orange cells). This means that in the 4th row, we can't have red in the B region (brown cell), hence, that cell is blue.

In the 1st row, all the red candidates are in the same A region (pink squares), and only one of them is true. This means that the second red square in this region must be only in the 2nd row (cyan cells). The second red in the 2nd row then must be one of the last two cells (lime cells) because those are in another B region. The 3rd row must also have a second red in the B region (orange cells). This means that in the 4th row, we can't have red in the B region (brown cell), hence, that cell is blue.

Remove candidates from rows, columns and regions where the two colors are already present.

To be precise, this is:

Candidates of some color in rows, columns or regions that already have two squares of that same color.

To fish it, do you see that...

Remove candidates from rows, columns and regions where the two colors are already present. I.E. Those candidates of some color in rows, columns or regions that already have two squares of that same color.

To finish it, do you see that...