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Spotted my first ALS-W-Wing. Placing 6 in either green squares locks the 7s in both ALSes to r89c2 or r6c4. Since one of these 3 cells has to contain 7, r6c2 (which
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Found this lesser known W-wing pattern when I was doing this puzzle. The blue 1/4 cells form a potential W-wing. If there is no 1 and 4 in the orange cells, you
R.XY − W ] (XY-Wing technique) and [R.XY Z − W ] (XYZ-Wing technique) | Download Scientific Diagram