To be fair, I think Leon was just posting his workings as

examples to demonstrate his conjecture, instead of a "

technique" for us to use.

I surely won't follow that procedure to solve any puzzle, nor would I recommend any others to follow it... But they are logically sound steps to prove that the solutions of those puzzles can be obtained in that manner (and proving the uniqueness of solution at the same time). They're sort of like mathematical proofs... You don't question how people set out to prove a theorem, as long as they show you all the logical steps.

Just like with the "singles backdoor twins conjecture" doesn't recommend us to solve every puzzle by finding 2 backdoor cells, I suppose we should treat this "bifurication + 2-level branching of contradiction chains conjecture" as a mathematical problem rather than a technique...

And sirdave, I think you should have correctly quoted that sentence as below:

ronk wrote:I should pinch myself, as it seems I've been here before.