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I also noted an XYZ wing pivoting at r7c9 eliminating the 6 in r9c9

The picture was worth it, I see it now.

Thanks for all the assistance from the group. Very helpful.

Thanks for the info on the xy-chains, however, I am still confused.

In the Johan post, I don't see how E-F is a conjugate pair in 5's.

In the TKiel post, I don't see how C-D is a conjugate pair ...

Thanks for all the info.

Keith, I did get the 3's using the UR. Thanks for explaining.

I'm still stuck on the pincer argument. I see the convergence of the two pincer cells at r1c3 but do not un ...

New to the site. Do not see how you conclude the pincers you reference are of opposite polarity. I do see a "play ahead" that determines r2c4 but I don't like that method. Help is welcomed.