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grenv: I'd still like to hear your answer to this question: to which position do you apply the test for mate? Is it (my contention) to the position at the end of move 40--before the ice age? Or is it to the position after the ice age adjustments--with White about to make move 41? It's a clear question, I think...and crucial.
If you claim that the ice age adjustments between moves 40 and 41 must be taken into account, note those same ice age adjustments could iinclude a black king's being frozen to death at the same time that white's king is mated. Or you'd be stuck claiming that you only consider the ice age consequences for some purposes that you choose, while ignoring other consequences of that identical event.