Paquita wrote:I was wondering about the fact that nothing happens for quite some levels
In the whole discussion about this case, this should remain as the main point. The rest was some misunderstanding about the output.
I've already mentioned it: when a puzzle has a high BxB classif = p, it often happens that there is a gap between a few first eliminations upto B7B or B8B and some elimination in BpB that unblocks the resolution. Often, but not always.
My tentative explanation is, for such BxB puzzles to exist, there must be some very special configuration of the candidates and it mustn't allow too many eliminations with shorter chains (otherwise, they could destroy the long one).
As I've said before, the 4 classifications are structural in nature (contrary to the SER). They allow to observe such phenomena and to formulate some hypotheses (as mine above) about them.
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