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$\begingroup$ Just to reiterate on the post itself after our discussion in chat, I really like this approach. It's a perfectly valid alternative logical process and displays a really useful technique for solvers to learn - namely, "where can piece X go?" rather than merely "what colour must this cell be?" and "which piece can go here?" With this logic you reach the solution very smoothly - a fantastic alternate answer! $\endgroup$
– Stiv
Commented Oct 15, 2020 at 9:55

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