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stockfish do check-mat without do check !

In this game : http://fr.lichess.org/rULEnPLD#6 stockfish do check-mat with Knight c4 !

In reality, after Nc4 i do Rg2 and just after i do tackback (because i saw it was a blunder) but stockfish do Ra1 mat in the same time, so lichess do the check-mat and do the tackback.

I don't know if this bug will be fixed because it's not really important, but i want to inform the lichess developpers
Reproduced, by making a move where the next stockfish move would be a checkmate.. but just before SF has time to move, you issue a takeback. The game ends without the real checkmate.

Reproduced http://en.lichess.org/zdLU70C4#4
Actual moves played http://en.lichess.org/ZU29JQ2o#8 (ignore the takeback in the chat, failed debugging)

The bug is therefore about the synchronization of takebacks and game ending event, and not about the position.

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