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Click on picture to enlarge it!
Black to move and win!
Answer below
White checkmates in one!
Answer below
Solutions:
R-d8 wins the knight, as it's pin to the rook!
B-c6 pins the rook to the queen! If white then moves R(d1)-f1, then black plays RxR! Assume the white replies RxR, black merely has to push his g-pawn up winning the black rook as that rook is now pinned to the queen!
R-d5 mate, as black's pawn, queen, and rook are all pinned by white's pieces!