#1: Thomas Genuine (Genuine) on Oct 18, 2013

We can read the meanings of ? solving keys. But what does the ! mean?

! indicates Deep Lookahead. It's in the forums somewhere.

Thx. I thought it means someone classified it heavy, but it's easy. :)
I state lookahead is a part of logic. There isn't easy or heavy logic, better or worse logic. A theory can be true or false (or paradox) :)

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