Delightful construction. Tough with all the cold solving and jumbles, but the extra wordplay was an interesting device. Ingenious to find those quotations to do all they need to do!
Re the shading, I think we need to look at the preamble again, which clearly says we are to shade the “
exactregion that the leading player
specifically declares infeasible” (my emphasis). There may be other regions which we can deduce must be infeasible, since we are told that C is compulsory, such as A without C for example. But there is just one area which is *specifically* declared infeasible. At least, that’s how I read it.
Oh, and I’m sure I’m not the only person who skipped the whole business with the swapping pairs entirely. Too much ambiguity. Once the three labels are found it is obvious what quotation is needed, from a play with a nice long name with a Z in it, so that was that. I may pick this up again and work out all the pairs if I have the stamina sometime…!
I have a couple of parsing queries just to settle my mind. For 1A I just don’t see the extra wordplay for consecutive letters, which I think derived from the last four words. And for 14A the definition is nice and clear but I don’t really see either of the bits of wordplay. It’s probably just my overheated brain, so any little hintets to point me the right way would be greatly appreciated.