1...Bh3!
Black brings another piece into play with tempo. Note that 2.gxh3 is impossible because of 2... Rf8+ 3.Kg2 Rf2+ 4.Kg1 Ne2 or Nf3#
2.Nc3Rf8+
3.Kg1Rf2
4.d3Rxg2+
5.Kf1Rg1++
6.Kxg1Nf3#
Aparts-Zaitsev (1963)