FEN: 1r6/4k3/r2p2p1/2pR1p1p/2P1pP1P/pPK1P1P1/P7/1B6 b - - 0 48
Source: Hard 2016.10 by Vincent Lejeune
Best move: Rxb3+

Black sacrifies a rook but after 49 Kxb3 Rb6+ 50 Kc2 Rb2+ Black’s Rook runs amok in White’s position, winning the e and c pawns and acquiring a central pawn steam-roller.