[Event "?"]  [Site "?"]  [Date "2017.08.27"]  [Round "?"]  [White "Weekly chess study # 22"]  [Black "Jan Timman"]  [Result "*"]  [SetUp "1"]  [FEN "5n2/8/4p1p1/pP2P1P1/N4P2/3Bk2p/b6P/4K3 w - - 0 1"]  [PlyCount "25"]   1. b6 Bd5   (1... Kxd3 $2 {Is quite bad} 2. Nc5+ Kd4 3. b7)   (1... Nd7 2. Bb5 Nb8  3. f5) 2. Bc4 $3 {[pgndiagram] White cannot achieve the goal without recourse  to sacrifices.}   (2. Bb5 $2 Kxf4 3. Nc5 Nh7 $1 4. b7 Bxb7 5. Nxb7 Nxg5 {  [pgndiagram] Black threatens Nf3+ and Nxh2.} 6. Bc6 {Is met strongly by} a4)   (  2. Nc5 $6 Kd4 3. b7 Bxb7 4. Nxb7 Kxd3 5. Kf2 {[pgndiagram] Is also not  dangerous.} Ke4   ({But not} 5... a4 6. Nc5+ Kc2 7. Nxa4 Nd7 8. Kg3 Kb3 9. f5 $3  {[pgndiagram] A beautiful stroke that wins}) 6. Kg3 Nd7 {On} 7. Nxa5 {The  simplest choice is} Nb6 8. Nb7 Nd5 9. Nc5+ Kf5 10. Nd3 Nc3 {[pgndiagram] And  the activity of Black's pieces offers full compensation   (11 Kxh3 Ne2 =)}) 2...  Bxc4   (2... Bg2 3. Nc5 {This move is now much stronger than immediate 2 Nc5.  For example} Kxf4   (3... Kd4 {Also doesn't help} 4. Nxe6+ Kxc4 5. Nxf8 a4 6. Kd2  a3 7. Kc1 {[pgndiagram] And wins}) 4. b7 Bxb7 5. Nxb7 Nd7   (5... a4 6. Nc5) 6.  Nxa5 Nxe5 7. Be2 {Preventing Nf3} Kxg5 8. Kf2 Kf4 9. Nb3 {[pgndiagram] And  White should exploit his extra piece}) 3. b7 Nd7 {[pgndiagram] Now White has  an important choice to make - to break with f5 immediately, or after the  preparatory Nb6} 4. f5 $3 {The strongest move in the position}   (4. Nb6 $6 Ba6  $1   (4... Nb8 {Is met by} 5. f5 $1 (5. Nxc4+ Kxf4 {Is equal})) 5. f5 a4 $1   (5...  exf5 6. e6 {Transposes to the main variation}) 6. fxe6 {The only move}   (6. Nxd7  Bxb7 {Suddenly White is losing} 7. f6 a3) 6... a3 {The strongest}   (6... Nb8 {  Seems to lose, because of the following long and forcing variation} 7. e7 Bb5  8. Kd1 {[pgndiagram] It is important to get in the square of the a-pawn} Kf4 9.  e6 {Threatening Nd7} Be8 10. Nd7 Nc6 11. Nf6 Kf5 12. Nxe8 Kxe6 13. Nc7+ Kxe7  14. Na6 Ke6 15. Kc1 {[pgndiagram]And White wins here}) 7. Nd5+ Kf3 8. Nc3 Nb8  9. e7 a2   (9... Bb5 $4 10. Nxb5 a2 11. Nd4+) 10. Nxa2 Bb5 11. Nc3 Bc6 12. Nd5 {  [pgndiagram] Black now attacks one of the white pawns with the king on the  next move and, according to Dvoretsky, he gets the draw everywhere}) 4... exf5   (4... gxf5 5. Nb6 Ba6   (5... Nb8 6. g6) 6. Nxd7 Bxb7 7. g6)   (4... Ba6 5. fxg6)  5. Nb6 $1 Ba6   (5... Nb8 6. Nxc4+) 6. e6   (6. Nxd7 Bxb7 7. e6 Bc6) 6... Nb8 7.  Nd7 {[pgndiagram]}   (7. e7 Bb5) 7... Bb5 $1   (7... Bxb7 8. e7) 8. Nxb8 f4 9. e7  f3 {[pgndiagram]The play has grown much sharper. White must find a series of  only moves in order to avoid mate} 10. e8=Q+ Bxe8 11. Nd7 $3   (11. Nc6 $2 {Is  faulty} f2+ 12. Kf1 Bxc6 {And mate can't be prevented}) 11... f2+ 12. Kf1 Bf7 (  12... Bxd7 13. b8=Q {Is the point. Bg2 is not possible, and the queen covers  the b5 square}) 13. Nb6 $3 {[pgndiagram]And finally White wins.}   (13. Ne5 $2  Bd5 {Would lead to the repetition of moves} 14. Ng4+ Kf3 15. Ne5+) *