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mate in 4 -> mate in 4 ??

This is arguably more of a bug report but I've noticed lately that in analysis the engine sometimes flags as inaccuracy a so called "not the best checkmate sequence", even when the number of moves is not actually higher.

Here is an example in my latest game: http://en.lichess.org/FL3PXf9I/black
It is higher, just poorly represented.

It's actually mate in 4 -> mate in 5
you had a mate in 4; after you move, you still have a mate in 4. Where you should have a mate in 3.

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