[Event "XII Americas Continental-ch 2017"]
[Site "Medellin"]
[Date "2017.06.12"]
[Round "4"]
[White "Bachmann, Axel"]
[Black "Ramirez, Alejandro"]
[Result "1/2-1/2"]
[ECO "D11"]
[WhiteElo "2653"]
[BlackElo "2552"]
[Annotator "TA"]
[PlyCount "44"]
[EventDate "2017.??.??"]
[EventType "swiss"]
[EventCountry "COL"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 13,44,15,25,22,32,20,23,4,27,26,14,24,35,25,27,37,19,0,0,0,20,16,16,16,26,0,0,0,0,0,0,-2,-2]} 1. Nf3 d5 2. d4 Nf6 3. c4 c6 4. e3 e6 5. Bd3 Nbd7 6. b3 {D30: Queen's Gambit Declined: Systems without Nc3} b6 7. O-O Bb7 {LiveBook: 50 Games} 8. Qe2 {White has an edge.} Be7 9. Bb2 O-O 10. Rd1 Qc7 11. Nc3 Rfe8 12. Rac1 Rad8 13. h3 Qb8 14. a3 a5 15. Ne5 Nxe5 16. dxe5 {[#]} Nd7 $146 ({Predecessor:} 16... dxc4 17. Bxc4 Nd7 18. f4 b5 {½-½ (91) Bacrot,E (2717)-Van Wely,L (2647) Wijk aan Zee 2006}) 17. cxd5 cxd5 18. Bb5 Rf8 $1 19. Bxd7 Rxd7 {The position is equal.} 20. Na4 Bc8 21. Rc2 Rb7 22. Rdc1 Bd7 {Precision: White = 67%, Black = 69%.} 1/2-1/2

[Event "XII Americas Continental-ch 2017"]
[Site "Medellin"]
[Date "2017.06.12"]
[Round "4"]
[White "Bruzon Batista, Lazaro"]
[Black "Quintiliano Pinto, Renato R"]
[Result "1-0"]
[ECO "A06"]
[WhiteElo "2650"]
[BlackElo "2483"]
[Annotator "TA"]
[PlyCount "138"]
[EventDate "2017.??.??"]
[EventType "swiss"]
[EventCountry "COL"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 19,138,0,6,10,15,18,19,1,27,16,21,15,8,-6,41,36,77,62,74,2,0,17,9,20,32,19,91,16,70,66,63,74,80,95,92,69,73,68,69,49,50,34,173,158,416,347,340,347,329,221,213,200,355,353,345,162,162,172,156,157,162,159,156,130,181,159,148,71,141,126,252,131,162,83,82,66,129,121,123,38,70,6,183,172,166,152,277,256,325,326,310,299,712,722,1147,1057,978,729,837,625,399,0,743,0,0,0,724,652,463,298,289,0,0,0,29979,29980,29985,29979,29979,29980,29985]} 1. Nf3 d5 2. g3 Nf6 3. Bg2 e6 4. c4 Be7 5. d4 O-O 6. Nc3 Nbd7 7. O-O dxc4 8. e4 c6 9. Bf4 Re8 10. a4 a5 11. Qe2 {E07: Closed Catalan: Main Line (5 Nf3 0-0 6 0-0 Nbd7)} b6 12. Rfd1 Ba6 13. Nd2 {The position is equal.} Bf8 14. Nxc4 Nd5 15. Bd2 (15. exd5 exd5 16. Qc2 Bxc4 $17) 15... Rc8 16. Rac1 Nb4 {[#]} 17. e5 $146 ({Predecessor:} 17. Be3) 17... c5 18. Nb5 $1 Nd5 19. Qg4 (19. Be3 $16) 19... f5 (19... Bxb5 $5 20. axb5 f5 21. exf6 N7xf6 $11) 20. exf6 N7xf6 21. Qe2 cxd4 22. Nxd4 Kh8 (22... Qd7 $11) 23. Bh3 (23. Nb5 $16) 23... Rxc4 (23... Nc3 $11 24. Bxc3 Bxc4) 24. Rxc4 $14 {aiming for Nb5.} Bxc4 25. Qxc4 e5 26. Ne6 {[%cal Bd4e6,Be6g5,Bg5f3,Bf3h4,Bh4g6,Bg6f4][%mdl 32]} Qd6 27. Ng5 Qc5 28. Qb3 {Black must now prevent Bc3.} h6 29. Rc1 Qe7 $1 30. Nf3 $36 {[%mdl 2048] Black is under pressure.} e4 (30... Qf7 $14) 31. Nh4 $1 $18 {[%cal Rh4g6]} Qd8 $2 (31... Qb7 $16 {keeps fighting.} 32. Ng6+ Kh7) 32. Ng6+ Kh7 33. Bf5 Bc5 34. Be3 Bxe3 35. fxe3 h5 $2 (35... Qd6 {is a better defense.} 36. Rc6 Qb4 37. Qxb4 Nxb4 38. Rxb6 Nbd5 39. Nf4+ Kh8 40. Nxd5 Nxd5) 36. Nf4+ Kh6 37. Rd1 (37. Rc8 $142 Qd6 38. Rxe8 Nxf4 39. Rh8+ (39. exf4 Nxe8 40. Kg2 Nf6 $14) 39... Kg5 40. Bxe4 Ne2+ 41. Kf2 Nxe4+ 42. Kxe2) 37... Re5 38. Be6 $1 {[%cal Re6d5]} g5 39. Bxd5 gxf4 40. Bc4 Qc7 41. gxf4 Re7 (41... Rc5 $16 42. Be2 Rc2) 42. Be2 Rg7+ 43. Kh1 (43. Kf1 $142) 43... Rg6 (43... Qc6 $142) 44. Qc3 Qg7 (44... Qxc3 $16 {might work better.} 45. bxc3 h4) 45. Qe1 (45. Qe5 $18) 45... Qe7 46. Qf2 (46. Bc4 $18) 46... Qc5 $16 47. Rg1 Rxg1+ (47... Rg7 $1 $14) 48. Qxg1 Kh7 {[#]} 49. h3 (49. b3 $1 $16) 49... Qc2 $1 $14 {[%cal Rc2e2]} 50. Bb5 ({White should try} 50. f5 $1 $14 Qxe2 51. Qg6+ Kh8 52. Qxf6+ Kg8 53. Qe6+ (53. Qxb6 Qf1+ 54. Kh2 Qf2+ 55. Kh1 Qf1+ 56. Kh2 Qf2+ 57. Kh1 Qf1+ $11) 53... Kf8 54. Qd6+ (54. Qxe4 Qf1+ 55. Kh2 Qf2+ 56. Qg2 Qxe3 $11) 54... Kf7 55. Qc7+ (55. Qxb6 Qf1+ 56. Kh2 Qf2+ 57. Kh1 Qf1+ 58. Kh2 Qf2+ 59. Kh1 Qf1+ $11) 55... Kf8 56. Qd8+ (56. Qxb6 Qf1+ 57. Kh2 Qf2+ 58. Kh1 Qf1+ 59. Kh2 Qf2+ 60. Kh1 Qf1+ $11) 56... Kf7 57. Qc7+ (57. Qxb6 Qf1+ 58. Kh2 Qf2+ 59. Kh1 Qf1+ 60. Kh2 Qf2+ 61. Kh1 Qf1+ $11) 57... Kf8 58. Qd8+ (58. Qxb6 Qf1+ 59. Kh2 Qf2+ 60. Kh1 Qf1+ 61. Kh2 Qf2+ 62. Kh1 Qf1+ $11) 58... Kf7 59. Qc7+ (59. Qxb6 Qf1+ 60. Kh2 Qf2+ 61. Kh1 Qf1+ 62. Kh2 Qf2+ 63. Kh1 Qf1+ $11)) 50... Qd2 $2 (50... Kh8 $1 $11) 51. f5 $18 {Threatening mate with Qg6+.} Kh8 {[#]} 52. Qg5 $1 {[%cal Rg5f6]} Qc1+ (52... Nh7 $16 53. Qf4 (53. Qxh5 Qxe3 54. Be2 Qc1+ 55. Kg2 Qxb2 $16) 53... Qxb2 54. Qxe4 Qc1+ 55. Kg2 Qd2+ 56. Kf1 Qc1+ 57. Kf2 Qd2+ 58. Be2 Qd6 59. Qe8+ (59. Bxh5 Nf6 $16) 59... Kg7 60. Qxh5 Qh2+ 61. Ke1 Qg3+ 62. Kd2 Nf6) 53. Kg2 Qxb2+ 54. Kg3 Qe5+ 55. Kh4 Qe7 $2 (55... Qb2 56. Be2 Nh7 57. Qd8+ Kg7 58. Qc7+ Kh8 59. Qb8+ (59. Bxh5 Qf6+ 60. Kg3 Qg5+ 61. Bg4 Qxe3+ 62. Kh4 Qh6+ 63. Kg3 Qe3+ 64. Kh4 Qh6+ 65. Kg3 Qe3+ $11) 59... Kg7 60. Qg3+ (60. Bxh5 Qf6+ 61. Kg3 Qg5+ 62. Bg4 Qxe3+ 63. Kg2 Qd2+ 64. Kh1 Qe1+ 65. Kg2 Qd2+ 66. Kh1 Qe1+ 67. Kh2 Qf2+ 68. Kh1 Nf6 $11) 60... Kf8 61. Qd6+ Kg7 62. Qg3+ Kh8 63. Kxh5 Qf6) 56. Bc4 Qe5 57. Be6 Qa1 58. Qg3 Qc3 59. Kg5 {And now Qb8+ would win.} Kg7 {Now ...Qc5 and Black clings on.} 60. Kh4+ $2 (60. Ba2) 60... Kh8 61. Qf4 Qe1+ $1 62. Qg3 ({Weaker is} 62. Kg5 Qg1+ 63. Kh4 Kh7 $18) 62... Qc3 $1 63. Bf7 Qa1 64. Bg6 {Strongly threatening Qc7.} Qc3 65. Qb8+ $2 ({Better is} 65. Bxh5 $18 {Threatens to win with Qd6.} Qc5 66. Qf4) 65... Kg7 $11 66. Qg3 Kf8 $2 {[%mdl 8192]} (66... Kh8 $11) 67. Qd6+ {White mates.} Kg8 68. Qd8+ Kg7 69. Qe7+ Kh8 {Precision: White = 45%, Black = 38%.} 1-0

[Event "XII Americas Continental-ch 2017"]
[Site "Medellin"]
[Date "2017.06.12"]
[Round "4"]
[White "Cori, Jorge"]
[Black "Martinez Romero, Martin"]
[Result "1-0"]
[ECO "A48"]
[WhiteElo "2618"]
[BlackElo "2427"]
[Annotator "TA"]
[PlyCount "69"]
[EventDate "2017.??.??"]
[EventType "swiss"]
[EventCountry "COL"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 15,69,-11,0,-13,14,23,16,17,16,17,17,19,16,16,14,0,1,4,31,12,32,27,32,27,100,86,115,130,173,166,158,172,173,177,173,164,147,141,140,96,179,166,178,129,160,156,247,218,368,375,462,445,436,445,440,331]} 1. d4 Nf6 2. Nf3 g6 3. c3 Bg7 4. Bf4 O-O 5. e3 d6 6. h3 b6 7. Nbd2 {A48: 1 d4 Nf6 2 Nf3 g6: Torre, London and Colle Systems} (7. a4 a5 8. Nbd2 Bb7 9. Bb5 Nbd7 10. O-O Re8 11. Bh2 Qc8 12. Re1 c6 13. Bd3 Ba6 14. Nc4 Qb7 {½-½ (106) Kamsky,G (2676)-Nepomniachtchi,I (2751) Sochi 2017}) 7... Bb7 8. Bh2 Nbd7 {LiveBook: 5 Games} 9. a4 {The position is equal.} Ne4 $146 (9... e5 $5) ({Predecessor:} 9... a6 10. Be2 c5 11. O-O {½-½ (11) Diulger,A (2364)-Baryshpolets,A (2305) Kiev 2007}) 10. Nxe4 Bxe4 11. Ba6 {[%cal Bf1a6,Ba6d3,Bd3c2][%mdl 32]} c5 12. O-O Qc7 13. Qe2 Bb7 14. Bd3 Rac8 15. Rfd1 c4 16. Bc2 a6 17. e4 b5 18. Bf4 e5 19. Be3 h6 (19... exd4 $11 {keeps the balance.} 20. Bxd4 (20. Nxd4 bxa4 21. Nf3 a3 $14) 20... Ne5) 20. Qd2 Nf6 21. Bxh6 Nxe4 22. Qe3 exd4 23. Nxd4 Rce8 24. Bxg7 (24. axb5 Nxf2 25. Qxf2 Bxh6 $15) 24... Kxg7 25. axb5 axb5 26. Ra7 Qb8 27. Ra5 b4 (27... d5 $16 28. Rda1 (28. Nxb5 Nd6 $16) 28... Nd6) 28. cxb4 $18 d5 29. Nf3 Nf6 30. Qc3 $36 {[%mdl 2048] White is in control.} Qf4 {[#]} (30... Qd6 $16 31. b3 cxb3) 31. Rb5 $1 {[%cal Rb5b7]} Ba8 (31... Rb8 {might work better.} 32. Rb6 Ba8) 32. Rb6 Re6 33. Rxe6 {White is clearly winning.} fxe6 34. Re1 Re8 35. b5 {Precision: White = 76%, Black = 42%.} 1-0

[Event "XII Americas Continental-ch 2017"]
[Site "Medellin"]
[Date "2017.06.12"]
[Round "4"]
[White "Sevian, Samuel"]
[Black "Vazquez, Guillermo"]
[Result "1-0"]
[ECO "B90"]
[WhiteElo "2601"]
[BlackElo "2443"]
[Annotator "TA"]
[PlyCount "55"]
[EventDate "2017.??.??"]
[EventType "swiss"]
[EventCountry "COL"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 21,55,15,22,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,91,97,87,89,94,106,95,83,224,219]} 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 e5 7. Nb3 Be6 8. f3 Be7 9. Qd2 O-O 10. O-O-O Nbd7 11. g4 {[%cal Bg2g4,Bg4g5][%mdl 32]} b5 12. Rg1 {B90: Sicilian Najdorf: Unusual White 6th moves, 6 Be3 Ng4 and 6 Be3 e5} Nb6 13. Na5 Rc8 14. g5 $1 {[%cal Rg5f6] The position is equal.} Nh5 15. Kb1 g6 16. h4 Qc7 17. Nd5 Nxd5 18. exd5 {[#]} Bd7 $146 ({Predecessor:} 18... Bxd5 19. Qxd5 Qxa5 {0-1 (40) Salem,A (2615)-Sjugirov,S (2667) Moscow 2016}) 19. c4 Bd8 20. Nc6 $1 Bxc6 21. dxc6 Qxc6 22. cxb5 axb5 23. Rc1 Qb7 (23... Qxc1+ $11 {keeps the balance.} 24. Qxc1 Rxc1+ 25. Bxc1 b4) 24. Rxc8 $16 ({Inferior is} 24. Qxd6 Rxc1+ 25. Bxc1 (25. Kxc1 Bc7 $17) 25... Bb6 $17) 24... Qxc8 25. Qxd6 Bc7 26. Qc6 b4 27. Ba6 Qa8 (27... Qf5+ $16 {was necessary.} 28. Ka1 Qe6) 28. Rc1 {Precision: White = 90%, Black = 68%.} ({Not} 28. Qxc7 Qxa6 29. Qxe5 Rd8 $14) 1-0

[Event "XII Americas Continental-ch 2017"]
[Site "Medellin"]
[Date "2017.06.12"]
[Round "4"]
[White "Fier, Alexandr"]
[Black "Kaidanov, Gregory S"]
[Result "1-0"]
[ECO "D44"]
[WhiteElo "2576"]
[BlackElo "2550"]
[Annotator "TA"]
[PlyCount "83"]
[EventDate "2017.??.??"]
[EventType "swiss"]
[EventCountry "COL"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 28,83,112,110,172,85,170,143,163,163,163,158,159,158,191,115,97,108,100,98,143,122,243,231,330,340,314,329,353,353,324,351,343,333,318,0,325,325,311,337,332,326,330,323,481,472,497,494,552,549,485,493,549,549,707,708,660,642]} 1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. Nc3 c6 5. Bg5 dxc4 6. e4 b5 7. e5 h6 8. Bh4 g5 9. Nxg5 hxg5 10. Bxg5 Nbd7 11. exf6 Qa5 12. g3 Ba6 13. Qf3 b4 14. Ne4 O-O-O 15. Be2 {LiveBook: 15 Games. D44: Semi-Slav: Botvinnik System} c5 $146 {[#]} (15... Bb7 $16) ({Predecessor:} 15... Bb7 16. Bxc4 Nb6 17. Bb3 c5 18. O-O c4 19. h4 Qf5 20. Qxf5 exf5 21. Nc5 cxb3 22. axb3 Rxd4 {0-1 (50) Kuzubov,Y (2653)-Baghdasaryan,V (2401) Poti 2015}) 16. Nxc5 (16. Rc1 $1 $18) 16... Bxc5 (16... Nxc5 $16 {was necessary.} 17. Qc6+ (17. dxc5 Bb7 $14) 17... Qc7 18. Qxc7+ Kxc7 19. dxc5 Bxc5) 17. dxc5 $18 {[%cal Bd4c5,Bc5c6][%mdl 32] White is clearly better.} Bb7 18. c6 Qxg5 19. cxb7+ $40 {[%mdl 128] White has strong attack.} Kb8 {[#]} 20. h4 $1 {[%cal Rh4g5]} Qe5 21. O-O-O (21. Rc1 $18) 21... c3 $16 22. bxc3 bxc3 23. Kc2 Qa5 {Threatens to win with ...Nb6.} 24. Bc4 Ne5 (24... Nb6 $16 25. Qxc3 Qf5+ 26. Kb3 Kxb7) 25. Qxc3 $18 Qa4+ (25... Nxc4 {was worth a try.} 26. Qxc4 Qf5+ 27. Kb3 Qf3+ 28. Qc3 Qxf2 29. Qe5+ Kxb7 30. Qb5+ Qb6 31. Qxb6+ Kxb6 32. Rxd8 Rxd8) 26. Bb3 {White threatens Rxd8+ and mate.} Qe4+ 27. Kb2 Rd3 28. Rhe1 Rxc3 29. Rxe4 Rc5 30. Ra4 Rc7 31. Re4 $2 ({Better is} 31. Rb4 $18) 31... Nd7 $2 {[%mdl 8192]} (31... Rc5 $1 $11 {and Black stays safe.} 32. Ka3 a6) 32. Red4 Nxf6 33. Rd8+ ({Don't take} 33. Rf4 Nh5 $18) 33... Rxd8 34. Rxd8+ Kxb7 {[%mdl 4096] Endgame KRB-KRN} 35. Bd1 Nd7 (35... Re7 $142 36. h5 Kc7) 36. h5 {[%cal Bh4h5,Bh5h6][%mdl 32] White is clearly winning.} f5 37. h6 Ne5 {and the idea ...Rh7 leaves Black hopeful.} 38. f4 Nc4+ 39. Kb3 Kb6 40. Rb8+ Ka5 41. Be2 Nd2+ 42. Ka3 {Precision: White = 78%, Black = 45%.} 1-0

[Event "XII Americas Continental-ch 2017"]
[Site "Medellin"]
[Date "2017.06.12"]
[Round "4"]
[White "Ortiz Suarez, Isan Reynaldo"]
[Black "Zapata, Alonso"]
[Result "1/2-1/2"]
[ECO "B40"]
[WhiteElo "2570"]
[BlackElo "2420"]
[Annotator "TA"]
[PlyCount "115"]
[EventDate "2017.??.??"]
[EventType "swiss"]
[EventCountry "COL"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 14,115,23,0,8,0,0,0,7,0,19,0,4,15,20,0,0,0,0,-21,-16,-12,-18,-18,-19,-43,-43,-80,-77,-125,-124,-125,-122,-270,-328,-344,-326,-392,-398,-403,-392,-382,-354,-308,-242,-346,-345,-339,-305,-304,-288,-409,-402,-368,-306,-1813,-808,-1767,-608,-1818,-607,-1823,-1818,-1720,-1668,-1600,0,-1554,-1554,-1497,-1387,-1287,-1044,-5871,-5584,-4753,-4101,-29970,-29971,-29971,-29972,-29972,-29973,-29973,-29974,-29974,-29975,-29976,-29977,-29977,-29978,-29978,-29979,-29982,-29974,-29963,-29976,-29974,-8,-8,-8,-8,-8,-8]} 1. e4 c5 2. Nf3 e6 3. Be2 Nc6 4. d4 cxd4 5. Nxd4 Nf6 6. Nc3 Bb4 7. O-O O-O 8. Qd3 e5 {B45: Sicilian Four Knights} (8... d5 9. exd5 exd5 10. Bf4 Re8 11. Bf3 Qb6 12. Rad1 Ne5 13. Bxe5 Rxe5 14. a3 Bd6 15. Qb5 Bc5 16. Qxb6 Bxb6 {½-½ (35) Voiculescu,C (2583)-Chiru,I (2534) ICCF email 2010}) 9. Nb3 Bxc3 10. bxc3 d5 11. exd5 Nxd5 $146 ({Predecessor:} 11... Qxd5 12. Bg5 Qxd3 13. cxd3 Nd5 14. Rac1 h6 15. Bd2 Bf5 16. Rfe1 {1-0 (63) Agulnick,M (2090)-Holanda,D (2031) IECC email 2010}) 12. Rd1 Nf4 13. Bxf4 exf4 14. Qxd8 Rxd8 15. Bf3 {aiming for Bxc6.} (15. Na5 $5 {[%cal Ra5c6]} Rxd1+ 16. Rxd1 $11) 15... Bf5 16. Nd4 (16. Nc5 {is interesting.} Bxc2 17. Rxd8+ Nxd8 18. Re1 Ne6 19. Nxe6 Re8 20. Bxb7 fxe6 21. g3) 16... Nxd4 17. Rxd4 Rxd4 18. cxd4 $11 {[%mdl 4096] Endgame KRB-KRB} Rc8 19. Bxb7 Rxc2 20. d5 Kf8 21. a4 Ke7 22. Re1+ Kd6 23. f3 (23. Ba6 $17 {was called for.}) 23... Rb2 $19 24. Ba6 Rb1 ({Stronger than} 24... Kxd5 25. Re7 $11) 25. Rxb1 Bxb1 {KB-KB} 26. Bc4 a5 27. Bb3 Kc5 28. Kf2 Bf5 29. Ke2 (29. g3 {is the only way for White.}) 29... Kb4 30. Bd1 Kc3 31. d6 Bd7 32. Ke1 (32. Kf2 $142) 32... g5 33. Kf2 h5 {[%cal Bh7h5,Bh5h4][%mdl 32]} 34. h3 $2 (34. g3) 34... f6 (34... h4 $142 35. Kf1 f6) 35. Ke1 Bc6 (35... h4 $142 36. Ke2 Be8) 36. Ke2 f5 (36... h4 $142 37. Kf2 Kc4) 37. Ke1 h4 38. Ke2 Bd7 39. Ke1 Bc6 40. Ke2 $1 Kd4 41. Kd2 Ke5 42. Kc3 Kxd6 43. Kc4 {[#]} g4 $1 {[%mdl 512]} 44. Kd4 (44. fxg4 Bxg2) 44... Bd5 45. fxg4 fxg4 46. Bxg4 Bxg2 47. Bf5 Bc6 48. Bc2 f3 49. Ke3 Kc5 50. Bd1 Kb4 51. Kf2 Bxa4 52. Bxf3 Bd7 53. Bg4 Bb5 54. Ke3 a4 55. Kd2 Kb3 $2 (55... a3 {mates} 56. Kc1 Bd3 57. Kd2 a2 58. Kxd3 a1=Q 59. Ke4 Kc5 60. Be6 Qf6 61. Bf5 Qd4+ 62. Kf3 Kd5 63. Bh7 Qf6+ 64. Ke3 Qe7+ 65. Kd3 Qxh7+ 66. Ke3 Qe4+ 67. Kf2 Qf4+ 68. Ke2 Kd4 69. Kd1 Kd3 70. Ke1 Qf6 71. Kd1 Qf1#) 56. Bd1+ $1 $11 {The position is equal.} Kc4 {[#]} 57. Bxa4 $1 {[%mdl 512]} Bxa4 58. Ke3 {Precision: White = 24%, Black = 68%.} 1/2-1/2

[Event "XII Americas Continental-ch 2017"]
[Site "Medellin"]
[Date "2017.06.12"]
[Round "4"]
[White "Flores, Diego"]
[Black "Cuartas, Jaime Alexander"]
[Result "0-1"]
[ECO "B38"]
[WhiteElo "2567"]
[BlackElo "2492"]
[Annotator "TA"]
[PlyCount "134"]
[EventDate "2017.??.??"]
[EventType "swiss"]
[EventCountry "COL"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 25,134,0,-9,-107,-108,-110,-114,-129,-131,-123,-114,-153,-145,-153,-57,-80,-54,-61,-57,-57,-58,-63,-56,-77,-72,-77,-70,-74,-78,-78,-59,-84,-91,-179,-77,-84,-84,-77,-77,-84,-76,-79,-74,-79,-79,-85,-89,-87,-75,-86,-87,-86,-81,-82,0,-85,-53,-61,-53,-53,-53,-89,-68,-325,-325,-317,-9,-9,-9,-9,-9,-16,-8,-29951,-29954,-29953,-29954,-29957,-29959,-29957,-29960,-29963,-29959,-29967,-29968,-29968,-29967,-29965,-29968,-29969,-29970,-29969,-29971,-29972,-29973,-29973,-29974,-29976,-29977,-29977,-29977,-29977,-29978,-29977,-29978,-29981,-29982,-29987,-29984,-29988,-29989]} 1. c4 c5 2. Nf3 g6 3. d4 cxd4 4. Nxd4 Bg7 5. e4 Nc6 6. Be3 Nf6 7. Nc3 O-O 8. Be2 b6 9. O-O Bb7 10. Qd2 Nxd4 11. Bxd4 e5 12. Bxe5 Nxe4 13. Nxe4 Bxe5 14. f4 {B38: Sicilian: Maroczy Bind with 5...Bg7 and 7...0-0} (14. Nd6 $11 Bxd6 15. Qxd6) (14. Nd6 Bc6 15. Rad1 Qf6 16. b3 Bf4 17. Qd4 Qh4 18. h3 f5 19. c5 Rf6 20. Bb5 Bf3 21. Rd3 Kg7 {1-0 (58) Korneev,O (2581)-Argandona Riveiro,I (2434) Linares 2014}) 14... Bxb2 $1 $17 15. Qxb2 Bxe4 16. Bf3 {Black is better.} Bxf3 17. Rxf3 Rc8 $146 ({Predecessor:} 17... Qc7 18. f5 Qc5+ 19. Kh1 Qxc4 20. Qd2 f6 21. fxg6 hxg6 {0-1 (81) Parameswaran,T (2365)-Crouch,C (2410) Kolkata 1994}) 18. f5 Rxc4 19. Raf1 gxf5 ({Black should try} 19... Qh4 $17 20. Rd1 Qe7) 20. Rxf5 Rg4 21. Qe5 d6 22. Qe3 Rg7 23. h3 Re8 24. Qf4 {[%cal Rf5f7]} Qe7 25. Rf2 Qc7 26. Rf6 Re5 27. Kh2 b5 28. Rd2 Rg6 29. Rdxd6 (29. Rfxd6 $17 Rxd6 30. Qxe5) 29... Re6 (29... Rc5 $19 {is more deadly.} 30. Rxg6+ hxg6) 30. Rdxe6 Qxf4+ 31. Rxf4 Rxe6 {[%mdl 4096] Endgame KR-KR} 32. a4 a6 33. axb5 axb5 34. Rb4 Re5 35. Rd4 Kf8 36. Kg3 Ke7 37. Kf4 Rc5 38. Ke3 Rc3+ 39. Ke4 Rc5 (39... Rc2 $17 40. Rb4 Rc5) 40. Kd3 (40. Ke3 $1 $11) 40... Ke6 {[#] ...Rd5 is the strong threat.} 41. Re4+ Re5 {aiming for ...Rxe4.} 42. Rh4 h5 43. Kc3 Kf6 44. g4 $2 {[%mdl 8192]} ({Better is} 44. Kd3 $15) 44... hxg4 $19 45. hxg4 Rg5 $2 (45... Kg7 $19 {Black wants to play ...f6.} 46. Kd4 f6) 46. Rh6+ $1 $11 Kg7 47. Rb6 Rd5 48. Kb4 Rd4+ 49. Kxb5 $2 {[%mdl 8192] [#]} (49. Kc3 $11 Rd5 50. Kb4) 49... Rxg4 {Black mates.} 50. Kc5 f6 {[%cal Bf7f6,Bf6f5,Bf5f4,Bf4f3][%mdl 32]} 51. Kd5 Kg6 52. Rb8 f5 53. Rb1 Kf6 54. Rf1 Ra4 55. Re1 f4 56. Re4 Ra5+ 57. Kd4 Kf5 58. Re8 Ra3 59. Rg8 f3 60. Rf8+ Kg4 61. Ke4 Kg3 62. Rg8+ Kh2 63. Rh8+ Kg2 64. Rg8+ Kf1 65. Kf4 f2 66. Re8 Kg2 67. Rg8+ Kh2 {Precision: White = 40%, Black = 58%.} 0-1

[Event "XII Americas Continental-ch 2017"]
[Site "Medellin"]
[Date "2017.06.12"]
[Round "4"]
[White "Shabalov, Alexander"]
[Black "Sanchez, Sebastian Felipe"]
[Result "1-0"]
[ECO "C10"]
[WhiteElo "2556"]
[BlackElo "2388"]
[Annotator "TA"]
[PlyCount "44"]
[EventDate "2017.??.??"]
[EventType "swiss"]
[EventCountry "COL"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 19,44,14,8,-22,22,-31,54,47,54,46,44,54,39,-141,-144,-142,-143,-139,16,3,189,193,168,158,29984,29985,29997]} 1. e4 e6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nd7 5. Nf3 {[%cal Bg1f3,Bf3e5,Be5c4][%mdl 32]} Ngf6 6. Nxf6+ Nxf6 7. Be3 Bd6 {C10: French with 3 Nc3: Unusual Black 3rd moves and 3...dxe4} 8. Bd3 b6 (8... O-O 9. Qe2 b6 10. O-O-O Bb7 11. Kb1 Nd5 12. Bd2 Nf4 13. Bxf4 Bxf4 14. Be4 Bxe4 15. Qxe4 Qf6 16. Rd3 Rad8 17. Rhd1 a5 18. g3 {½-½ (18) Shankland,S (2676)-Cordova,E (2645) Matanzas 2017}) 9. Ne5 O-O 10. Qf3 Nd5 $1 {LiveBook: 4 Games} 11. Bd2 {aiming for c4.} Bb7 12. O-O-O (12. c4 $11 Bxe5 13. Qh3 (13. cxd5 Bf6 $17)) 12... Qh4 (12... c5 $1 $15) 13. Rhe1 $14 f5 $146 ({Predecessor:} 13... c5 14. dxc5 bxc5 15. Nc4 {½-½ (23) Pavasovic,D (2575)-Tratar,M (2483) Zadar 2006}) 14. Nc4 $1 Qxd4 15. Rxe6 Bc5 16. Rf1 $2 {[#]} (16. Re5 $14 {keeps the upper hand.}) 16... Nb4 $1 $17 17. Qe2 Nxd3+ ({Worse is} 17... Nxa2+ 18. Kb1 $16) 18. cxd3 {[#]} Bxg2 $2 (18... Qd7 $1 $17 19. Bc3 Rad8) 19. Rg1 $11 Bd5 $2 (19... f4 $1 $11 {and Black is okay.} 20. Bc3 (20. Rxg2 f3 $17) 20... f3 21. Bxd4 fxe2 22. Bxc5 bxc5) 20. Be3 $18 Qh4 21. Bxc5 {Black must now prevent Qe5.} Bxc4 $2 ({Don't go for} 21... Qxh2 $2 22. Rg3 $18) (21... Qf4+ $16 22. Kb1 bxc5) 22. Qe5 {[%csl Gg1][%cal Re5g7]} Rf7 {Precision: White = 43%, Black = 30%.} 1-0

[Event "XII Americas Continental-ch 2017"]
[Site "Medellin"]
[Date "2017.06.12"]
[Round "4"]
[White "Vasquez Schroeder, Rodrigo"]
[Black "Iturrizaga Bonelli, Eduardo"]
[Result "1/2-1/2"]
[ECO "B42"]
[WhiteElo "2553"]
[BlackElo "2663"]
[Annotator "TA"]
[PlyCount "29"]
[EventDate "2017.??.??"]
[EventType "swiss"]
[EventCountry "COL"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 12,29,54,25,31,1,16,5,42,41,36,43,38,43,47,23,60,18,9,5]} 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Bd3 Ne7 6. O-O Nbc6 7. Nb3 g6 {B42: Sicilian: Kan Variation: 5 Bd3} (7... Ng6 8. a4 b6 9. f4 Be7 10. Be3 d6 11. c3 O-O 12. N1d2 Bb7 13. Qf3 e5 14. f5 Nf4 15. Bc2 {1-0 (26) Hansen,E (2603)-Smirin,I (2667) Wijk aan Zee 2017}) 8. f4 d5 9. e5 Bg7 10. N1d2 $146 ({Predecessor:} 10. a4 O-O 11. a5 f6 12. exf6 Bxf6 13. Nc3 Bg7 14. Qe2 e5 15. fxe5 Rxf1+ 16. Qxf1 Bxe5 {½-½ (55) Biolek,R (2406)-Ivanov,M (2497) Marianske Lazne 2009}) 10... f6 11. exf6 Bxf6 12. Nf3 O-O 13. Qe2 Qc7 14. Re1 Bd7 15. c3 1/2-1/2

[Event "XII Americas Continental-ch 2017"]
[Site "Medellin"]
[Date "2017.06.12"]
[Round "4"]
[White "Erenburg, Sergey"]
[Black "Cordova, Emilio"]
[Result "1-0"]
[ECO "B01"]
[WhiteElo "2550"]
[BlackElo "2651"]
[Annotator "TA"]
[PlyCount "57"]
[EventDate "2017.??.??"]
[EventType "swiss"]
[EventCountry "COL"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 18,57,101,94,115,97,100,104,112,123,120,57,126,93,264,262,272,253,329,325,325,324,452,451,407,368,389,386,399,408,395,358,418,410,447,448,512,509,480,474,646,639]} 1. e4 d5 2. exd5 Qxd5 3. Nf3 Nf6 4. d4 c6 5. Be2 Bg4 6. h3 {B01: Scandinavian Defence} Bh5 (6... Bxf3 7. Bxf3 Qa5+ 8. c3 e6 9. Bf4 Qa6 10. Qb3 Nbd7 11. Nd2 Nd5 12. Bg3 Be7 13. Nc4 {1-0 (48) Giri,A (2752)-Kramnik,V (2783) Flor & Fjaere 2014}) 7. O-O e6 8. c4 Qd8 9. Nc3 Nbd7 10. Bf4 {LiveBook: 3 Games} Nb6 11. g4 $146 ({Predecessor:} 11. b3 Bb4 12. Rc1 O-O 13. Ne5 Bxc3 14. Rxc3 Bxe2 15. Qxe2 Qxd4 {½-½ (47) Schneider,J (1883)-Hipler,A (1696) Gau Algesheim 2010}) 11... Bg6 12. Ne5 Nfd7 13. Nxg6 hxg6 14. c5 Nc8 (14... e5 $1 $14) 15. Kg2 Be7 $2 {[#]} (15... Nf6 $16 {was called for.}) 16. Qb3 $18 b6 17. Bf3 bxc5 18. Bxc6 Ncb6 {[#]} 19. dxc5 $1 Bxc5 20. Rad1 Rc8 21. Qb5 {Hoping for Qxc5.} Rxc6 22. Qxc6 Qc8 23. Qxc8+ Nxc8 24. Ne4 Be7 25. Rc1 Ncb6 26. Rc7 {White is clearly winning.} e5 27. Be3 f5 28. Nc3 e4 29. Rd1 {Precision: White = 84%, Black = 14%.} 1-0

[Event "XII Americas Continental-ch 2017"]
[Site "Medellin"]
[Date "2017.06.12"]
[Round "4"]
[White "Mekhitarian, Krikor Sevag"]
[Black "Fernandez Reyes, Lisandro"]
[Result "1-0"]
[ECO "B90"]
[WhiteElo "2542"]
[BlackElo "2402"]
[Annotator "TA"]
[PlyCount "93"]
[EventDate "2017.??.??"]
[EventType "swiss"]
[EventCountry "COL"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 19,93,11,45,19,47,50,52,45,57,57,57,49,59,50,64,51,58,63,76,55,62,63,69,58,92,77,81,64,91,88,90,78,123,118,124,135,234,234,234,234,234,227,265,266,266,266,267,263,272,208,208,208,208,202,201,201,201,183,188,188,179,185,211,211,211,211,209,208,506,494,586,536,572,548,999,1014]} 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 Ng4 7. Bg5 h6 8. Bc1 {B90: Sicilian Najdorf: Unusual White 6th moves, 6 Be3 Ng4 and 6 Be3 e5} Nc6 (8... Nf6 9. Bd3 e5 10. Nde2 Be7 11. O-O O-O 12. Ng3 Nbd7 13. a4 Nc5 14. Be2 Be6 15. Bf3 Rc8 {½-½ (66) Grischuk,A (2750)-Vachier Lagrave,M (2795) Moscow 2017}) 9. Be2 Qb6 10. Bxg4 Qxd4 {LiveBook: 3 Games} (10... Bxg4 {seems wilder.} 11. Qxg4 Qxd4 12. O-O e6 13. h3 g5) 11. O-O (11. Qxd4 {feels hotter.} Nxd4 12. Bd1 Be6 13. Be3 Nc6 14. Be2) 11... Qxd1 12. Bxd1 e6 $146 ({Predecessor:} 12... b5 13. Nd5 Rb8 14. Be3 e6 15. Nb6 Ne5 16. Nxc8 Rxc8 {1-0 (32) Nowak,Z (2417)-Hauschild,A Chessfriend.com 2004}) 13. Na4 $1 Be7 14. Nb6 Rb8 15. c3 Ne5 16. Be2 Bd8 17. Be3 Bc7 18. a4 {[%cal Ba2a4,Ba4a5][%mdl 32]} Nd7 19. Nxc8 Rxc8 20. Rfd1 Ke7 21. a5 Ne5 22. f4 Nc6 23. b4 {[%cal Bb2b4,Bb4b5,Bb5b6][%mdl 32]} Rhd8 24. Kf1 Kf8 25. g3 Ne7 26. c4 Rd7 27. b5 Ra8 (27... Ke8 $16 28. Kf2 Bd8) 28. b6 $18 Bd8 {[#]} 29. Bc5 $1 {[%mdl 512]} Nc6 (29... dxc5 30. Rxd7) 30. e5 {[%cal Be4e5,Be5d6][%mdl 32]} ({Don't do} 30. Rxd6 $6 Ke8) 30... Be7 31. exd6 Bf6 32. Ra4 Rc8 33. Bf3 Bc3 34. Bxc6 Rxc6 35. Ba3 Ke8 36. Rd3 Bf6 37. c5 Rd8 38. g4 Kd7 39. Ke2 Rcc8 40. Re4 Rh8 41. Rf3 g6 42. Kd3 h5 43. f5 exf5 $2 {[#]} (43... gxf5 44. gxf5 e5) 44. gxf5 {White is clearly winning.} g5 45. Rfe3 Kc6 46. Kc4 Rcd8 47. Bb4 {Precision: White = 82%, Black = 42%.} 1-0

[Event "XII Americas Continental-ch 2017"]
[Site "Medellin"]
[Date "2017.06.12"]
[Round "4"]
[White "Vera Siguenas, Deivy"]
[Black "Delgado Ramirez, Neuris"]
[Result "0-1"]
[ECO "B90"]
[WhiteElo "2526"]
[BlackElo "2613"]
[Annotator "TA"]
[PlyCount "98"]
[EventDate "2017.??.??"]
[EventType "swiss"]
[EventCountry "COL"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 26,98,54,47,72,24,33,37,29,35,26,39,16,18,14,-11,54,50,56,49,38,43,58,62,56,64,61,61,43,48,66,30,57,50,64,14,8,-16,-21,-49,-50,-43,-43,-87,-93,-133,-114,-107,-100,-170,-180,-177,-181,-181,-179,-228,-212,-336,-326,-346,-235,-262,-272,-276,-227,-291,-286,-345,-347,-425,-335,-574,-574,-565,-562]} 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 e5 7. Nb3 Be7 8. f3 O-O 9. Qd2 Be6 10. O-O-O b5 11. g4 b4 12. Nd5 Bxd5 13. exd5 a5 14. Kb1 {LiveBook: 111 Games} Nbd7 {[%cal Bb8d7,Bd7b6,Bb6c4,Bc4e3][%mdl 32] B90: Sicilian Najdorf: Unusual White 6th moves, 6 Be3 Ng4 and 6 Be3 e5} (14... a4 15. Nc1 Qa5 16. g5 Nh5 17. Bh3 Na6 18. Bd7 Bd8 19. Nd3 Bb6 20. Bxb6 Qxb6 21. Bxa4 Nc5 22. Nxc5 Qxc5 23. Bb3 f5 24. Rc1 Rae8 25. c3 bxc3 26. Qxc3 Qf2 27. Rhf1 Qg2 28. Rg1 {½-½ (28) Khairullin,I (2537)-Gashimov,V (2608) Istanbul 2005}) 15. Bb5 Nb6 16. Bc6 Nc4 {White is slightly better.} 17. Qe2 Nxe3 18. Qxe3 Ra6 $1 19. f4 $146 a4 20. Nc1 Nd7 (20... a3 $11) 21. Nd3 $1 $14 exf4 22. Qxf4 b3 $1 23. cxb3 axb3 24. a3 Nc5 25. Qc4 Rb6 26. Rhf1 Qc7 27. Rf3 Nd7 28. Re1 (28. g5 $5) 28... Bh4 29. Re2 Bg5 30. h4 Bxh4 31. Qf4 {Hoping for g5.} h6 $1 32. Re8 {Black must now prevent Qxf7+.} Bf6 33. Rxf8+ Kxf8 34. Qa4 Rb8 35. Re3 Bg5 36. Re2 {[#]} Nf6 $1 37. Nb4 (37. Qd4 $17) 37... Qc8 $19 38. Qxb3 Qxg4 39. Qc2 g6 40. Na6 Rc8 {Threatens to win with ...Nxd5!} 41. Qd3 (41. Rg2 $142 Qf4 42. Nb4) 41... h5 {[%cal Bh6h5,Bh5h4][%mdl 32]} 42. Ka2 Nd7 43. Bxd7 Qxd7 44. Nb4 Re8 45. Rf2 {And now Qxg6 would win.} Kg8 46. Nc6 h4 47. Rf3 Qg4 48. Qf1 $2 {[#]} (48. Na5 {is a better defense.}) 48... Re1 $1 {[%mdl 512]} 49. Qd3 (49. Qxe1 Qxf3) 49... Qg1 {Precision: White = 46%, Black = 67%.} 0-1

[Event "XII Americas Continental-ch 2017"]
[Site "Medellin"]
[Date "2017.06.12"]
[Round "4"]
[White "Garcia Pantoja, Roberto"]
[Black "Quinonez Garcia, Santiago"]
[Result "1/2-1/2"]
[ECO "B38"]
[WhiteElo "2500"]
[BlackElo "2379"]
[Annotator "TA"]
[PlyCount "89"]
[EventDate "2017.??.??"]
[EventType "swiss"]
[EventCountry "COL"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 20,89,51,50,49,25,28,29,22,26,35,32,39,37,55,48,63,28,40,35,58,23,83,82,78,67,58,49,184,193,209,209,205,202,199,181,256,273,314,313,286,278,352,-66,-65,-65,-65,-65,0,0,0,0,0,0,0,-190,-183,-177,-184,-171,-11,-11,-11,-11,-15,-24,-8,-8,-3,-8,0,0]} 1. e4 c5 2. Nf3 g6 3. d4 cxd4 4. Nxd4 Nc6 5. c4 Bg7 6. Be3 Nf6 7. Nc3 d6 8. Be2 O-O 9. O-O Bd7 10. f3 Nxd4 11. Bxd4 a5 {B38: Sicilian: Maroczy Bind with 5...Bg7 and 7...0-0} 12. a3 (12. b3 Bc6 13. Qd2 Nd7 14. Be3 Nc5 15. Rab1 Qb6 16. Rfc1 Rfc8 17. Rc2 Qb4 18. Qc1 Qb6 19. Kh1 h5 20. a3 Qd8 21. Qd2 Kh7 22. Bf1 Qf8 23. b4 axb4 24. axb4 Na4 25. Ne2 {1-0 (55) Navara,D (2734)-Mamedov,R (2650) Huaian 2016}) 12... a4 13. c5 dxc5 {White has an edge.} 14. Bxc5 Bc6 15. Qe1 $146 ({Predecessor:} 15. Qxd8 Rfxd8 16. Rfd1 e6 17. Kf2 Nd7 18. Be3 Bf8 19. Rac1 {½-½ (53) Dastan,B (2480)-Ozer,O (2374) Istanbul 2016}) 15... Qc7 16. Qf2 Rfe8 17. Rac1 Nd7 18. Nb5 Qb8 19. Ba7 Qd8 {[#] Threatens to win with ...Qa5.} 20. Bd4 Bh6 (20... Qa5 $11 21. Bxg7 Kxg7) 21. f4 Nf6 22. e5 $36 {[%mdl 2048] White is pushing.} Nd5 23. Qh4 Nxf4 (23... Bf8 $14) 24. Rxf4 $18 Bxf4 25. Qxf4 Qd5 {[%csl Gc6][%cal Rd5g2]} 26. Qf2 ({Weaker is} 26. Qf3 Qxd4+ 27. Nxd4 Bxf3 $14) 26... Bxb5 27. Rc5 {[#]} Qe4 (27... Qxd4 $142 $1 {[%mdl 512]} 28. Qxd4 Bxe2) 28. Rxb5 Red8 29. Bc3 Rac8 30. Rb4 Qc2 31. Rf4 $2 (31. Rxb7 $18 Qc1+ 32. Bf1 Rxc3 33. bxc3 Qxa3 34. Rc7) 31... Rxc3 $15 32. bxc3 Rd2 33. Rxf7 {Rf8+ is the strong threat.} Rxe2 {[%mdl 4096] Endgame KQR-KQR} ({Black should try} 33... Qc1+ $15 34. Qf1 Qxf1+ 35. Rxf1 Rxe2) 34. Rf8+ $11 Kg7 35. Rf7+ Kg8 36. Rf8+ Kg7 37. Qf7+ $2 (37. Rf7+ $11 {and White has nothing to worry.} Kg8) 37... Kh6 $19 38. Qf4+ g5 39. Qg3 Qc1+ $2 (39... Qe4 $19 {Strongly threatening ...Re3.} 40. Rf1 Qxe5 41. Qxe5 (41. Qh3+ $2 Kg7 $19) 41... Rxe5) 40. Rf1 $11 Qe3+ 41. Qxe3 Rxe3 42. Rb1 Rxc3 {Hoping for ...Rb3.} 43. Rxb7 {The position is equal.} Rxa3 {aiming for ...Kg6.} 44. Rxe7 Kg6 45. g4 {Precision: White = 67%, Black = 43%.} 1/2-1/2

[Event "XII Americas Continental-ch 2017"]
[Site "Medellin"]
[Date "2017.06.12"]
[Round "4"]
[White "Gonzalez Acosta, Bernal"]
[Black "Franco Valencia, Beatriz Irene"]
[Result "1-0"]
[ECO "B06"]
[WhiteElo "2494"]
[BlackElo "2173"]
[Annotator "TA"]
[PlyCount "117"]
[EventDate "2017.??.??"]
[EventType "swiss"]
[EventCountry "COL"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 10,117,47,44,55,23,59,48,54,41,45,51,87,20,58,0,14,0,38,0,75,85,114,114,154,139,201,171,150,149,157,140,198,186,199,184,252,242,237,237,300,273,248,262,259,239,291,261,244,240,269,258,253,257,304,170,163,91,155,163,163,160,183,194,194,209,202,208,262,283,391,383,394,388,390,394,379,280,262,93,375,381,383,383,1035,948,673,362,299,37,37,12,59,12,12,12,12,8,8,8,235,252,1836,255,7822,6424,5473,5409,29987,29988]} 1. e4 g6 2. Nc3 Bg7 3. d4 d6 4. Be3 a6 5. Qd2 b5 6. f3 Bb7 {B06: Modern Defence} (6... Nf6 7. O-O-O Nbd7 8. Bh6 Bxh6 9. Qxh6 b4 10. Nce2 e5 11. dxe5 dxe5 12. Kb1 Qe7 13. Nc1 Qf8 14. Qh4 Qe7 15. Qh6 Qf8 16. Qe3 Qc5 17. Qh6 {½-½ (17) Grischuk,A (2737)-Dubov,D (2660) Doha 2016}) 7. h4 {[%cal Bh2h4,Bh4g5][%mdl 32]} h6 8. Nh3 Nd7 {White is slightly better.} 9. O-O-O (9. h5 $5) 9... Ngf6 10. g4 c5 11. g5 (11. Kb1 $16) 11... hxg5 $11 12. hxg5 Nh5 13. Nf2 $146 {[%mdl 2048] White has the initiative.} ({Predecessor:} 13. dxc5 Ng3 14. Rh2 Nxf1 15. Rxf1 dxc5 {1-0 (30) Suvorov,S (2277)-Borisov,M Angarsk 2016}) 13... Qa5 {White must now prevent ...b4.} 14. Kb1 c4 (14... Ng3 $11 15. Rxh8+ Bxh8) 15. a3 $16 Qc7 16. Bh3 O-O-O 17. Bg4 Ng3 (17... Kb8 $16 18. f4 Ng3) 18. Rxh8 Rxh8 19. Rg1 Nh5 20. Rh1 Ng3 (20... Qd8 $16 21. Rh3 Kb8) 21. Rxh8+ $18 Bxh8 22. Qe1 Qb6 (22... Bg7 $142 23. Nfd1 Nh5) 23. Nfd1 Nh5 24. Ne2 Ng7 25. Qh4 Qd8 26. Qh3 {aiming for Bxd7+.} e6 {[#]} 27. d5 $1 {[%mdl 512]} Qg8 (27... exd5 28. Bxd7+) 28. a4 Ne5 29. axb5 axb5 30. Nd4 Nxg4 31. Qxg4 b4 32. Qg3 (32. Nb5 $142 Kd7 33. Bf4) 32... Ne8 33. Qe1 ({Better is} 33. Nb5 $1 $18 {[%cal Rb5d6]} Be5 34. Qe1) 33... exd5 (33... c3 $142) 34. Qxb4 $16 Bxd4 35. Bxd4 {Nc3 is the strong threat.} Qf8 36. Nc3 dxe4 37. Qxc4+ Kd7 38. Qa4+ Bc6 39. Qa7+ Nc7 {[#]} 40. Bb6 $1 Qc8 41. Nxe4 Qb7 42. Qxb7 Bxb7 43. Bxc7 Kxc7 $18 {[%mdl 4096] Endgame KB-KN} 44. c4 $2 (44. b4 $18 {is more deadly.}) 44... d5 $2 {[%mdl 8192]} (44... Kc6 $16 {keeps fighting.}) 45. cxd5 Bxd5 46. Kc2 Bc6 $2 (46... Bc4 47. Kc3 Be2) 47. Kd3 Kd7 48. Ke3 Ke6 49. Kf4 $2 ({White should try} 49. Nf6 $18) 49... Kd5 $1 $14 50. b4 Bb7 51. Nc5 Bc8 52. Nd3 {Threatens to win with b5.} Bf5 53. Ne5 Be6 54. Ng4 {Black should prevent Ne5.} Bc8 $2 {[#]} (54... Kc4 $11 {and Black stays safe.}) 55. b5 $1 $18 Bb7 $2 (55... Be6 56. Nh6 Kd6) 56. b6 $2 (56. Ne5 Ke6 57. Nc4) 56... Kc5 $2 (56... Kd6 57. Ne5 Bd5) 57. Ne5 Bd5 {[#]} 58. Nxf7 $1 {[%mdl 512]} Be4 (58... Bxf7 59. b7) 59. Kxe4 {Precision: White = 53%, Black = 20%.} 1-0

[Event "XII Americas Continental-ch 2017"]
[Site "Medellin"]
[Date "2017.06.12"]
[Round "4"]
[White "Hungaski, Robert Andrew"]
[Black "Peralta, Fernando"]
[Result "1/2-1/2"]
[ECO "A05"]
[WhiteElo "2492"]
[BlackElo "2569"]
[Annotator "TA"]
[PlyCount "52"]
[EventDate "2017.??.??"]
[EventType "swiss"]
[EventCountry "COL"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 12,52,11,14,14,6,14,20,23,17,14,0,5,-18,-27,-19,-23,-9,0,0,0,0,0,0,0,0,0,1,4,0,2,2,8,0,0,0,0,0,0,0,0,0,0]} 1. Nf3 Nf6 2. g3 d5 3. Bg2 Bf5 4. O-O e6 5. c4 c6 6. cxd5 exd5 7. d3 Na6 {A11: English Opening: 1...c6} 8. Nc3 Be7 9. a3 $146 ({Predecessor:} 9. Nd4 Bg4 10. h3 Bd7 11. e4 dxe4 12. dxe4 O-O 13. e5 Ne8 14. Be3 Nec7 15. f4 {0-1 (45) Fressinet,L (2687)-Savchenko,B (2633) Almaty 2016}) 9... O-O 10. Nd4 Bg6 11. b4 Nc7 12. e4 a5 13. Rb1 axb4 14. axb4 dxe4 {The position is equal.} 15. dxe4 Re8 16. Bf4 Bf8 {[%cal Rf6e4]} 17. Nxc6 Qxd1 18. Rfxd1 bxc6 19. Bxc7 Nxe4 20. Nxe4 Bxe4 21. Bxe4 Rxe4 22. Bd6 g6 23. Bxf8 Rxf8 24. Rdc1 Rb8 25. Rxc6 {Threatening b5.} Rexb4 26. Rxb4 Rxb4 {Precision: White = 68%, Black = 82%.} 1/2-1/2

[Event "XII Americas Continental-ch 2017"]
[Site "Medellin"]
[Date "2017.06.12"]
[Round "4"]
[White "Leiva, Giuseppe"]
[Black "Kovalyov, Anton"]
[Result "0-1"]
[ECO "E06"]
[WhiteElo "2449"]
[BlackElo "2643"]
[Annotator "TA"]
[PlyCount "84"]
[EventDate "2017.??.??"]
[EventType "swiss"]
[EventCountry "COL"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 22,84,4,0,0,0,22,-8,7,2,8,0,0,0,6,-10,17,18,6,0,1,0,0,0,0,-29,-22,-26,-25,-41,0,-13,-11,-13,-8,-22,0,-17,-10,-11,0,2,43,-31,-42,-29,-64,-33,-46,-98,-109,-150,-149,-135,-125,-123,-141,-135,-100,-169,-166,-240,-220,-234,-226]} 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Nf3 Be7 5. Bg2 O-O 6. O-O c6 7. Qc2 b6 8. Bf4 Nbd7 9. Rd1 Bb7 10. Ne5 Nh5 11. Bd2 Nhf6 12. Bf4 $146 ({Predecessor:} 12. cxd5 cxd5 13. Nc6 Bxc6 14. Qxc6 Rc8 15. Qb5 Ne8 16. Qd3 Nd6 17. Nc3 Nf6 18. b3 Qd7 19. Rac1 Rfd8 20. Rc2 Nde4 21. Be1 {½-½ (22) Radjabov,T (2710)-Gelfand,B (2724) Moscow 2017}) 12... Nh5 {E08: Closed Catalan: Main Line: 7 Qc2} 13. Bd2 f5 14. Bc3 Nhf6 {The position is equal.} 15. Nd2 {[%cal Bb1d2,Bd2f3,Bf3e5][%mdl 32]} a5 (15... Ne4 $5) 16. Ndf3 Bd6 17. b3 Ne4 18. Bb2 Rc8 19. Nxd7 Qxd7 20. Ne5 Qe7 21. f3 Nf6 22. e3 c5 23. Qf2 cxd4 24. exd4 Rc7 25. Bf1 Rfc8 (25... f4 $5 26. g4 Nd7 $11) 26. Re1 Nd7 27. Nxd7 Qxd7 28. Rac1 Kf7 29. Rc2 dxc4 30. bxc4 b5 {[%cal Rb5c4,Bb6b5,Bb5a4,Ba4a3,Ba3a2][%mdl 32]} 31. c5 {Black should prevent Rce2.} Bd5 32. a4 ({White should try} 32. Bc1 $14) 32... bxa4 $15 33. Ba6 Be7 34. Bxc8 Rxc8 35. Bc3 (35. g4 $15) 35... a3 $17 36. Bd2 Qa4 $36 {[%mdl 2048] Keeping White busy.} 37. Bf4 Bf6 38. Be5 Bxe5 39. dxe5 {[#]} Qb3 $1 40. Rcc1 (40. Rec1 $17 {was worth a try.}) 40... a2 $19 {[%mdl 1024] Black is clearly better. Black has strong compensation.} ({Weaker is} 40... Bxf3 41. Qe3 $15) (40... Qxf3 41. Qxf3 Bxf3 42. Re3 $16) 41. Re2 (41. Rc2 {was necessary.}) 41... Qa3 42. Ra1 Rxc5 {Precision: White = 38%, Black = 61%.} ({Don't play} 42... Qxc5 43. Qxc5 Rxc5 44. f4) 0-1

[Event "XII Americas Continental-ch 2017"]
[Site "Medellin"]
[Date "2017.06.12"]
[Round "4"]
[White "Pulvett Marin, Daniel"]
[Black "Pichot, Alan"]
[Result "1/2-1/2"]
[ECO "A40"]
[WhiteElo "2437"]
[BlackElo "2577"]
[Annotator "TA"]
[PlyCount "61"]
[EventDate "2017.??.??"]
[EventType "swiss"]
[EventCountry "COL"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 23,61,0,12,13,44,43,37,46,40,43,44,45,30,7,41,40,43,38,39,34,41,25,22,25,41,31,36,44,34,20,79,31,137,70,78,73,68,29,42,0]} 1. d4 Nf6 2. c4 e6 3. g3 Bb4+ 4. Bd2 a5 5. Bg2 O-O 6. Nf3 b6 7. O-O Bb7 8. Bf4 Be7 9. Nc3 Ne4 10. Qc2 Nxc3 11. Qxc3 d6 12. Rad1 Nd7 {LiveBook: 5 Games} 13. Qc2 {E16: Queen's Indian: 4 g3 Bb7 5 Bg2 Bb4+} f5 14. Ng5 Bxg5 15. Bxb7 Rb8 16. Bxg5 Qxg5 17. Bc6 $146 ({Predecessor:} 17. f4 Qg6 18. Bf3 Nf6 19. e3 Rfc8 20. a3 c6 {½-½ (44) Krasenkow,M (2485)-Rajskij,E Nabereznye Chelny 1988}) 17... Nf6 18. f4 Qh6 19. e4 fxe4 20. Bxe4 e5 21. Bc6 Kh8 22. Qe2 $36 {[%mdl 2048] White has good play.} exf4 23. Rxf4 Ng8 24. Rdf1 Rxf4 25. Rxf4 Qg6 26. Qe4 Qh5 (26... Qxe4 $11 {remains equal.} 27. Rxe4 Rf8) 27. Kg2 Qd1 (27... Nf6 $14 28. Qe7 Rg8) 28. Rf1 (28. Qe6 $16) 28... Qd2+ $14 29. Rf2 Qd1 30. Qh4 Qe1 31. Qe4 {Precision: White = 36%, Black = 42%.} 1/2-1/2

[Event "XII Americas Continental-ch 2017"]
[Site "Medellin"]
[Date "2017.06.12"]
[Round "4"]
[White "Fernandez, Fernando"]
[Black "Bacallao Alonso, Yusnel"]
[Result "0-1"]
[ECO "B12"]
[WhiteElo "2416"]
[BlackElo "2554"]
[Annotator "TA"]
[PlyCount "104"]
[EventDate "2017.??.??"]
[EventType "swiss"]
[EventCountry "COL"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 12,104,13,17,25,24,49,-14,-20,-4,-15,-21,-25,-34,-35,-62,-62,-46,-24,-20,7,2,12,-6,0,0,0,-25,-14,-24,-22,-32,-27,-33,-14,-21,-14,-45,-29,-37,-38,-47,-10,-12,0,0,32,-14,-7,-5,-4,-22,-22,-22,-22,-22,-22,-22,-22,-27,-27,-45,-8,-70,-76,-111,-41,-112,-112,-318,-277,-409,-355,-205,-132,-132,-114,-1631,-1606,-6099,-5984,-29973,-29974,-29974,-29974,-29981,-29982,-29982,-29983,-29990,-29991,-29993,-29994,-29994,-29995]} 1. e4 c6 {[%cal Bc7c6,Bc6c5][%mdl 32]} 2. d4 d5 3. e5 Bf5 4. Nf3 e6 5. Be2 c5 6. c3 Nc6 7. O-O h6 {B12: Caro-Kann: Advance Variation} (7... a6 8. Be3 c4 9. Nbd2 h6 10. g3 Nge7 11. Nh4 Bh7 12. Bg4 b5 13. f4 Qd7 14. b4 Bd3 15. Be2 Bxe2 16. Qxe2 {½-½ (40) Najer,E (2679)-Anton Guijarro,D (2679) Poikovsky 2017}) 8. Be3 Qb6 9. dxc5 (9. Na3 $14) 9... Bxc5 $11 {The position is equal.} ({Don't play} 9... Qxb2 10. Qb3 $14) 10. Bxc5 Qxc5 11. Qa4 $146 ({Predecessor:} 11. Na3 Nge7 12. b4 Qb6 13. b5 Na5 14. Nd4 Qc5 15. Qa4 {0-1 (36) Vogiatzis,D (2033)-Heyne,M (2154) Fuerth 2001}) 11... Nge7 12. Nbd2 O-O 13. Qb5 Qxb5 14. Bxb5 Rfc8 (14... a6 $5 {[%cal Ra6b5]} 15. Bxc6 bxc6 $15) 15. Rfe1 Na5 (15... a6 $5 {[%cal Ra6b5]} 16. Bf1 Rc7 $15) 16. Nd4 Bg6 17. a4 a6 18. Bf1 Nec6 19. N2f3 Be4 20. Re3 Rc7 21. b4 Nxd4 22. Nxd4 Nc6 23. Nxc6 Rxc6 24. a5 (24. c4 $5) 24... Bg6 25. f4 Rac8 26. Ra3 $1 d4 27. cxd4 Rc1 28. Kf2 Rd8 29. b5 axb5 $1 ({Of course not} 29... Rxd4 $6 30. bxa6 bxa6 31. Bxa6 $16) 30. Bxb5 Rxd4 31. Kg3 Be4 32. a6 bxa6 33. Bxa6 g5 $36 {[%mdl 2048] Black has good play.} 34. fxg5 hxg5 35. Be2 Rc5 36. Bf3 Rxe5 37. Re2 (37. Ra1 $11) 37... Kg7 $15 38. Rc3 f5 (38... Kf6 $17 39. Rce3 Bxf3 40. Rxf3+ Rf5) 39. Kf2 ({Better is} 39. Rc1 $15) 39... Kf6 $17 40. Rce3 $2 (40. Rc8 $17) 40... Bxf3 $19 41. gxf3 (41. Rxf3 {was necessary.} Rxe2+ 42. Kxe2) 41... Rxe3 42. Rxe3 {[%mdl 4096] Endgame KR-KR} Rd2+ 43. Kg1 f4 {[%cal Bf5f4,Bf4f3][%mdl 32]} 44. Ra3 $2 {[%mdl 8192] [#]} (44. Re4 $17) 44... g4 $1 {[%cal Rg4f3][%mdl 512]} 45. fxg4 {[#]} Kg5 $1 {[%cal Rg5g4]} 46. Ra6 e5 {[%cal Be6e5,Be5e4,Be4e3][%mdl 32] Black mates.} 47. Ra5 Re2 48. h3 f3 49. Kf1 Kf4 50. Ra8 e4 51. h4 e3 52. g5 Rb2 {Precision: White = 29%, Black = 52%.} 0-1

[Event "XII Americas Continental-ch 2017"]
[Site "Medellin"]
[Date "2017.06.12"]
[Round "4"]
[White "Zavarce, Oscar Enrique"]
[Black "Cruz, Cristhian"]
[Result "0-1"]
[ECO "B48"]
[WhiteElo "2364"]
[BlackElo "2558"]
[Annotator "TA"]
[PlyCount "102"]
[EventDate "2017.??.??"]
[EventType "swiss"]
[EventCountry "COL"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 13,102,35,34,33,49,27,83,87,103,79,83,84,81,60,65,51,76,29,20,20,43,-12,-16,-18,-16,-16,-16,-16,-16,-35,-36,-32,-35,-43,-40,-85,-90,-84,-84,-141,-158,-146,-124,-127,-125,-187,-174,-207,-222,-256,-261,-257,-252,-265,-268,-259,-263,-283,-275,-337,-314,-341,-324,-389,-394,-470,-471,-448,-451,-501,-433,-466,-481,-474,-460,-608,-603,-825,-821,-797,-794,-1014,-1001,-5800,-5522,-2323,-862,-29988,-29989,-29990,-29991]} 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 Qc7 6. Be3 a6 7. Qf3 {B48: Sicilian: Taimanov: 5 Nc3 Qc7 6 Be3 a6 without Be2} Nf6 {LiveBook: 187 Games} 8. O-O-O Be7 (8... Rb8 9. Be2 d6 10. Qg3 Nxd4 11. Bxd4 e5 12. Ba7 Ra8 13. Be3 b5 14. f4 Bb7 15. fxe5 Nxe4 16. Nxe4 Bxe4 {1-0 (42) Nepomniachtchi,I (2767)-Adhiban,B (2666) Doha 2016}) 9. Be2 {White is slightly better.} h5 (9... d6 $11 {keeps the balance.}) 10. Qg3 $16 Qxg3 11. hxg3 ({Don't play} 11. fxg3 $6 d6 $11) 11... Ne5 12. Nf3 $146 ({Predecessor:} 12. f3 b5 13. g4 Ng6 14. g5 Ng8 {1-0 (28) Lomasov,S (2393)-Zhao,C (2124) Khanty-Mansiysk 2016}) 12... Ng6 13. Bd4 b5 14. e5 Ng4 15. Bd3 Bb7 16. Ne4 Rc8 17. Rh3 (17. Nd6+ $14 Bxd6 18. exd6) 17... Bxe4 $11 18. Bxe4 Bc5 19. Bb7 Rc7 20. Bxa6 b4 21. Rd2 Ke7 22. Bb5 {[#] Strongly threatening Bxc5+.} Bxd4 23. Nxd4 {White wants to play f4.} N6xe5 24. Re2 {Threatens to win with f3.} Rc5 25. f3 Nf6 26. f4 (26. Ba4 $142) 26... Neg4 $17 27. Rh1 Ra8 28. Kb1 Kf8 29. c3 (29. Rc1 $17) 29... bxc3 $19 30. Rc1 {[#]} Rb8 $1 31. Rxc3 Rcxb5 32. Nxb5 Rxb5 33. a4 Ra5 34. b3 Nd5 35. Rc8+ Ke7 36. Rec2 Nge3 37. R2c5 Ra7 38. Kb2 Nxg2 39. Ka3 h4 40. gxh4 Ngxf4 41. Rb5 Nd3 42. h5 f5 {[%cal Bf7f5,Bf5f4,Bf4f3,Bf3f2][%mdl 32]} 43. Rbb8 Ne5 44. Rf8 Nf6 45. b4 f4 46. h6 gxh6 47. b5 f3 48. Rfc8 f2 49. Rc1 Nd5 50. Rf1 Nc4+ 51. Ka2 Rxa4+ {Precision: White = 37%, Black = 79%.} 0-1

