[Event "Shakmaty v SSSR 1936"]  [Site "?"]  [Date "2017.11.06"]  [Round "?"]  [White "Study 23"]  [Black "Alexandr Herbstman"]  [Result "*"]  [SetUp "1"]  [FEN "5K1k/5p1p/7P/5rP1/8/3P4/3P2p1/4R3 w - - 0 1"]  [PlyCount "31"]   1. Re8 $1 {[pgndiagram] The only way to win}   (1. Rg1 {Leads only to a draw}  Rxg5 2. Kxf7 Rf5+ 3. Ke6 Rf2 {[pgndiagram]}) 1... Re5 2. Ra8 $3 {It is  important to include this move}   (2. Rxe5 {Immediately doesn't work} g1=Q 3. Re8  Qa7 {[pgndiagram] And this is the key difference, the rook has to hold a7  square} 4. d4 Qd7 5. d5 Qb7 6. d6 Qd7 7. d4 f5 8. gxf6 Qe6 9. Rxe6) 2... Ra5 {  The only way of fending the mate} 3. Rxa5 $3 {[pgndiagram] A key move... White  allows the queening, but will create a mating threat} g1=Q 4. Ra8 {Now Black  has only one way of defending against the mate - attacking the rook} Qg2 {With  the hope of getting in with Qb7 as well} 5. Rb8 {[pgndiagram] But he will have  none of that} Qg3 {One more time'} 6. Rc8 {No} Qg4 7. Rd8 Qxg5 8. Re8 Qg8+ 9.  Ke7 {[pgndiagram] Now we have a pawn race instead} Qxe8+   (9... f5 {Loses even  faster - White forced the king on g8} 10. Rxg8+ Kxg8 11. d4 f4 12. d5 f3 13. d6  f2 14. d7 f1=Q 15. d8=Q+ {[pgndiagram] And wins} Qf8+ 16. Qxf8#) 10. Kxe8 f5  11. d4 f4 12. d5 f3 13. d6 f2 14. d7 f1=Q 15. d8=Q {[pgndiagram] There is only  way of defending against mate} Qf8+ $1 {Hoping for a stalemate, but of course,  Black will have none of that} 16. Kd7 {[pgndiagram] And White wins. An amazing  end to an amazing study} *