Daily chess puzzle: Check Mate #59
Another puzzle from Dragoslav Andric’s 1981 book “Matni Udar”.
Black to play and mate White
Mann v Pap, 1962
Solution
Easy today: 1…Rf3+ and after the forced 2 gf, 2…Bf1 is mate.
FEN
8/7k/b2N1r2/p3Rpp1/7p/2P4K/1P1R2PP/5r2 b – – 0 1
allanbeardsworth 
rg2?
You have forgotten to deflect the d2 rook first by 1 … Rxd6. In your second diagram, Rg2 is available to block the check.