Extremely difficult 'mate in n' problems

Originally posted by heinzkat
OK, I'll supply one too, here's one by Sawtschenko.

[fen]5q2/B4n2/p1Pp1Np1/3Pkp1N/B1P2p1P/p6b/PP3P1p/R3Kn2[/fen]

White to move, mate in eight.

Nobody solved this one so far. It's not that easy indeed...