Annotated chess game

There's no defence: [A] 20...Bg6 21.Rh3 and mate next; [B] 20...Qc8 21.Rxd3 and mate in 4; [C] 20...f6 21.Ne6 Rf7 22.Rg3+ (or simply 22.Nxd8) 22...Bg6 23.Rxg6 Nxg6 24.Qxg6 Kh8 25.Nxd8 Bxd8 26.Qxf7, recouping his investment at an usurous rate of interest. Instead, Black banks.

No flaws: the original sac was sound - as you would expect with such a lead in development - and the follow-up sac the correct method of exploiting Black's defence. Well played.