[White "Genrikh Kasparian Study"]   [Black "White to play and win"]   [Result "1-0"]   [FEN "8/8/8/p5pp/P7/5pkP/1R2p1P1/6BK w - - 0 1"]   {The solution starts with}   1 Bh2+!    ({In order to get the better understanding of the position and the main idea of the study, let us consider the solution proposed by the user  Aahan Tulshan.}   1 Rb3!? e1Q   2 Rxf3+ Kh4   3 Kh2!   {White threatens Bf2 and it seems deadly. However Black can defend with}   3... g4!!   4 Bf2+ g3+ !!   { And after}   5 Bxg3+ Qxg3 6 Rxg3   {There is a stalemate on the board.   We see that g4 is a good resource for Black and that White has to have an antidote prepaired.})   1... Kh4   {It seems that White hasn't accomplished much. But now comes the surprise:}   2 Rxe2 fxe2   3 Bc7!!   {An amazing move. White first eliminates the possibility of fxg2 by sacrificing the rook and lets Black queen his pawn with check.}   3 ... e1Q +   4 Kh2!   {And it turns out that Black has no defence against both Bg3+ and g3+ with mate.}   4 ... Qf2   ({On}  4 ... g4  {there is now}  5 Bd8  {mate.})   {Defending the g3 and pinning the g2 pawn. But then}   5 Bd6!!   {And amazingly, Black is in zugzwang.}