m (→‎Amir (953) vs Juan Pablo (927))
m (→‎Stefan (1008) vs Javier (964))
Line 543: Line 543:
  
 
1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 { Four Knights Game, General } 4. d3 Bc5 5. h3 O-O 6. a3 d5 7. exd5 Nxd5 8. Nxd5 Qxd5 9. c4 Qe6 10. Be2 Nd4 11. Ng5 Qf6 12. Be3 Nxe2 13. Bxc5?! { (-0.49 → -1.03) Inaccuracy. The best move was Ne4. } (13. Ne4 Qg6 14. Bxc5 Nd4 15. Bxd4 Qxg2 16. Kd2 exd4 17. Qh5 Qg6 18. Rag1 Qxh5 19. Nf6+ Kh8 20. Nxh5 g6 21. Ng3 Be6 22. Ne4 f6) 13... Re8? { (-1.03 → 0.71) Mistake. The best move was Qxg5. } (13... Qxg5 14. Qxe2 Qxg2 15. O-O-O Re8 16. Qe4 Qxe4 17. dxe4 b6 18. Be3 f5 19. f3 fxe4 20. fxe4 Bb7 21. Rhg1 g6 22. Rd7 Bxe4 23. a4) 14. Ne4 Qg6? { (0.80 → 2.46) Mistake. The best move was Qc6. } (14... Qc6 15. Qxe2 f5 16. Bb4 fxe4 17. Qxe4 Qxe4+ 18. dxe4 Be6 19. Rc1 a5 20. Bc3 Bf7 21. f3 a4 22. c5) 15. Qxe2 Qxg2? { (2.41 → 4.59) Mistake. The best move was f5. } (15... f5 16. Nd2 a5 17. f3 b6 18. Bg1 Bd7 19. Bh2 Qd6 20. O-O Rad8 21. Rae1 f4) 16. O-O-O Bxh3?? { (4.06 → 9.33) Blunder. The best move was Qg6. } (16... Qg6 17. Rhg1 Qf5 18. f4 Kh8 19. fxe5 Be6 20. Ng5 Rad8 21. Bxa7 h6 22. Rdf1 Qxd3 23. Qxd3 Rxd3 24. Nxe6 fxe6 25. Rf7 Ra8 26. Rfxg7) 17. Rdg1 Bg4?! { (9.33 → 19.56) Inaccuracy. The best move was Re6. } (17... Re6 18. Rxg2 Bxg2 19. Rh2 Rg6 20. f4 Bxe4 21. Qxe4 Re8 22. Qxb7) 18. Qxg4?? { (19.56 → 5.75) Blunder. The best move was Rxg2. } (18. Rxg2 f5 19. f3 b6 20. fxg4 f4 21. Bf2 c6 22. g5 Re7 23. Nf6+ Kf7 24. Rxh7 Rd8 25. Qg4 Kg6 26. Qh3 Rb8 27. Ne4 Rd8) 18... Qxg4 19. Rxg4 f5? { (5.68 → 7.22) Mistake. The best move was Re6. } (19... Re6 20. Rhg1 g6 21. Rh4 b6 22. Bb4 c5 23. Bd2 f5 24. Nc3 f4 25. Kc2 Rd8 26. Ne4 Kg7) 20. Rgh4?? { (7.22 → 3.53) Blunder. The best move was Nf6+. } (20. Nf6+ Kf7 21. Nxe8 fxg4 22. Nxc7 Rd8 23. Nd5 b6 24. Be3 h6 25. Rh4 Ke6 26. Rxg4 g5 27. Rg1 Kf5 28. Kc2 Kg6 29. Ne7+ Kf6) 20... fxe4 21. dxe4?! { (3.46 → 2.96) Inaccuracy. The best move was Rxh7. } (21. Rxh7 exd3 22. Kd2 a5 23. Kxd3 Rad8+ 24. Kc3 b6 25. Be3 Rd6 26. c5 Rde6 27. cxb6 cxb6 28. Kc4 Kf7 29. Kb5) 21... h6 22. Be3 Re6 23. Rg1 Kh7 24. Rhg4 Rg8 25. Bxa7?! { (2.98 → 2.37) Inaccuracy. The best move was Rh4. } (25. Rh4 b6 26. Kc2 Rg6 27. Rd1 Rd6 28. Rhh1 Rdd8 29. Rd5 Rge8 30. b3 Kg6) 25... b6 26. c5?! { (2.38 → 1.45) Inaccuracy. The best move was f4. } (26. f4 g5 27. fxg5 Ra8 28. Bxb6 cxb6 29. gxh6 Rc8 30. b3 b5 31. Rg7+ Kxh6 32. Rg8) 26... Rc6 27. Kb1 Rxc5 28. Rg6 Ra5 29. Bxb6?! { (1.50 → 0.87) Inaccuracy. The best move was Bb8. } (29. Bb8 Rc5 30. b4 Rc4 31. Ba7 Rc3 32. Kb2 Rf3 33. R1g2 Rf7 34. b5 Ra8 35. Bxb6 cxb6 36. Rxb6 h5 37. Re6 h4 38. Rxe5 Kh6) 29... cxb6 30. Rxb6 Ra4 31. f3 g5 32. Re6 Ra5?! { (1.57 → 2.17) Inaccuracy. The best move was Rf8. } (32... Rf8 33. Rg3 Rd4 34. Rh3 Kg7 35. Ka2 g4 36. fxg4 Rxe4 37. b4 Rb8 38. Kb2 Kf7 39. Rhxh6 Rxg4 40. Rhf6+ Kg7 41. Rf2 Re4 42. Rf3) 33. Rh1?! { (2.17 → 1.19) Inaccuracy. The best move was Rc1. } (33. Rc1 g4 34. Rcc6 Rg5 35. fxg4 Rxg4 36. Rxh6+ Kg7) 33... Rg6 34. Re7+ Rg7?! { (1.18 → 1.94) Inaccuracy. The best move was Kg8. } (34... Kg8 35. Rc1 Kf8 36. Rd7 Ra8 37. Rc5 Rf6 38. Kc1 Rb8 39. Rd3 Kg7 40. Rxe5 Rbf8 41. Rd7+ Kg6) 35. Rxg7+ Kxg7 36. b4? { (1.86 → -0.77) Mistake. The best move was Ka2. } (36. Ka2 Kg6 37. b4 Ra8 38. Kb3 h5 39. b5 g4 40. fxg4 hxg4 41. Rg1 Kg5 42. a4 Kf4 43. Kb4 g3 44. a5 Kf3) 36... Rxa3 37. Kb2?! { (-0.62 → -1.35) Inaccuracy. The best move was Kc2. } (37. Kc2 Rxf3 38. Rb1 g4 39. b5 Rf8 40. b6 Rb8 41. b7 h5 42. Kd3 Kf6 43. Rb6+ Kg5 44. Ke3 h4 45. Rb5 h3 46. Rxe5+ Kf6) 37... Rxf3 38. Rd1?! { (-0.98 → -1.88) Inaccuracy. The best move was b5. } (38. b5 g4 39. Kc2 Kg6 40. b6 Rf7 41. Kc3 Rb7 42. Rb1 h5 43. Kc4 h4 44. Kd5 g3 45. Kc6 Rb8 46. Kc7 Rh8 47. Rg1 Kg5) 38... Re3? { (-1.88 → -0.43) Mistake. The best move was g4. } (38... g4 39. b5 h5 40. b6 Rf8 41. Kc3 Rb8 42. Rb1 h4 43. Kd2 h3 44. Rg1 Rxb6) 39. b5 Rxe4 40. b6?? { (-0.55 → -4.05) Blunder. The best move was Kb3. } (40. Kb3 Rf4 41. b6 g4 42. b7 Rf8 43. Kc4 Rb8 44. Rb1 h5 45. Kd5 g3 46. Kxe5) 40... Rb4+ 41. Kc3 Rxb6 42. Rd5 Rc6+ 43. Kd3 Kf6 44. Ke4? { (-4.05 → -5.15) Mistake. The best move was Rd8. } (44. Rd8 Kf5 45. Rh8 g4 46. Ke3 Rc3+ 47. Kf2 Rh3 48. Kg2 h5 49. Rf8+ Ke4 50. Rg8 Kf4 51. Rf8+ Ke3 52. Rg8 e4 53. Rg7 Kf4) 44... Rc4+ 45. Kd3?? { (-4.99 → Mate in 17) Checkmate is now unavoidable. The best move was Ke3. } (45. Ke3 h5 46. Rd8 h4 47. Rf8+ Ke6 48. Rh8 Kf5 49. Kd3 Ra4 50. Ke2 Kf4 51. Rf8+ Kg4 52. Rb8 h3 53. Kf2 Ra1 54. Rb4+ e4) 45... Rd4+ 46. Rxd4 exd4 47. Kxd4 Kf5 48. Ke3 Kg4 49. Kf2 h5 50. Kg2 h4 51. Kh2 Kf4 52. Kh3 g4+ 53. Kxh4 g3 54. Kh3 Kf3 55. Kh4 g2 56. Kh3 g1=Q 57. Kh4 Qg4# { White is checkmated } 0-1
 
1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 { Four Knights Game, General } 4. d3 Bc5 5. h3 O-O 6. a3 d5 7. exd5 Nxd5 8. Nxd5 Qxd5 9. c4 Qe6 10. Be2 Nd4 11. Ng5 Qf6 12. Be3 Nxe2 13. Bxc5?! { (-0.49 → -1.03) Inaccuracy. The best move was Ne4. } (13. Ne4 Qg6 14. Bxc5 Nd4 15. Bxd4 Qxg2 16. Kd2 exd4 17. Qh5 Qg6 18. Rag1 Qxh5 19. Nf6+ Kh8 20. Nxh5 g6 21. Ng3 Be6 22. Ne4 f6) 13... Re8? { (-1.03 → 0.71) Mistake. The best move was Qxg5. } (13... Qxg5 14. Qxe2 Qxg2 15. O-O-O Re8 16. Qe4 Qxe4 17. dxe4 b6 18. Be3 f5 19. f3 fxe4 20. fxe4 Bb7 21. Rhg1 g6 22. Rd7 Bxe4 23. a4) 14. Ne4 Qg6? { (0.80 → 2.46) Mistake. The best move was Qc6. } (14... Qc6 15. Qxe2 f5 16. Bb4 fxe4 17. Qxe4 Qxe4+ 18. dxe4 Be6 19. Rc1 a5 20. Bc3 Bf7 21. f3 a4 22. c5) 15. Qxe2 Qxg2? { (2.41 → 4.59) Mistake. The best move was f5. } (15... f5 16. Nd2 a5 17. f3 b6 18. Bg1 Bd7 19. Bh2 Qd6 20. O-O Rad8 21. Rae1 f4) 16. O-O-O Bxh3?? { (4.06 → 9.33) Blunder. The best move was Qg6. } (16... Qg6 17. Rhg1 Qf5 18. f4 Kh8 19. fxe5 Be6 20. Ng5 Rad8 21. Bxa7 h6 22. Rdf1 Qxd3 23. Qxd3 Rxd3 24. Nxe6 fxe6 25. Rf7 Ra8 26. Rfxg7) 17. Rdg1 Bg4?! { (9.33 → 19.56) Inaccuracy. The best move was Re6. } (17... Re6 18. Rxg2 Bxg2 19. Rh2 Rg6 20. f4 Bxe4 21. Qxe4 Re8 22. Qxb7) 18. Qxg4?? { (19.56 → 5.75) Blunder. The best move was Rxg2. } (18. Rxg2 f5 19. f3 b6 20. fxg4 f4 21. Bf2 c6 22. g5 Re7 23. Nf6+ Kf7 24. Rxh7 Rd8 25. Qg4 Kg6 26. Qh3 Rb8 27. Ne4 Rd8) 18... Qxg4 19. Rxg4 f5? { (5.68 → 7.22) Mistake. The best move was Re6. } (19... Re6 20. Rhg1 g6 21. Rh4 b6 22. Bb4 c5 23. Bd2 f5 24. Nc3 f4 25. Kc2 Rd8 26. Ne4 Kg7) 20. Rgh4?? { (7.22 → 3.53) Blunder. The best move was Nf6+. } (20. Nf6+ Kf7 21. Nxe8 fxg4 22. Nxc7 Rd8 23. Nd5 b6 24. Be3 h6 25. Rh4 Ke6 26. Rxg4 g5 27. Rg1 Kf5 28. Kc2 Kg6 29. Ne7+ Kf6) 20... fxe4 21. dxe4?! { (3.46 → 2.96) Inaccuracy. The best move was Rxh7. } (21. Rxh7 exd3 22. Kd2 a5 23. Kxd3 Rad8+ 24. Kc3 b6 25. Be3 Rd6 26. c5 Rde6 27. cxb6 cxb6 28. Kc4 Kf7 29. Kb5) 21... h6 22. Be3 Re6 23. Rg1 Kh7 24. Rhg4 Rg8 25. Bxa7?! { (2.98 → 2.37) Inaccuracy. The best move was Rh4. } (25. Rh4 b6 26. Kc2 Rg6 27. Rd1 Rd6 28. Rhh1 Rdd8 29. Rd5 Rge8 30. b3 Kg6) 25... b6 26. c5?! { (2.38 → 1.45) Inaccuracy. The best move was f4. } (26. f4 g5 27. fxg5 Ra8 28. Bxb6 cxb6 29. gxh6 Rc8 30. b3 b5 31. Rg7+ Kxh6 32. Rg8) 26... Rc6 27. Kb1 Rxc5 28. Rg6 Ra5 29. Bxb6?! { (1.50 → 0.87) Inaccuracy. The best move was Bb8. } (29. Bb8 Rc5 30. b4 Rc4 31. Ba7 Rc3 32. Kb2 Rf3 33. R1g2 Rf7 34. b5 Ra8 35. Bxb6 cxb6 36. Rxb6 h5 37. Re6 h4 38. Rxe5 Kh6) 29... cxb6 30. Rxb6 Ra4 31. f3 g5 32. Re6 Ra5?! { (1.57 → 2.17) Inaccuracy. The best move was Rf8. } (32... Rf8 33. Rg3 Rd4 34. Rh3 Kg7 35. Ka2 g4 36. fxg4 Rxe4 37. b4 Rb8 38. Kb2 Kf7 39. Rhxh6 Rxg4 40. Rhf6+ Kg7 41. Rf2 Re4 42. Rf3) 33. Rh1?! { (2.17 → 1.19) Inaccuracy. The best move was Rc1. } (33. Rc1 g4 34. Rcc6 Rg5 35. fxg4 Rxg4 36. Rxh6+ Kg7) 33... Rg6 34. Re7+ Rg7?! { (1.18 → 1.94) Inaccuracy. The best move was Kg8. } (34... Kg8 35. Rc1 Kf8 36. Rd7 Ra8 37. Rc5 Rf6 38. Kc1 Rb8 39. Rd3 Kg7 40. Rxe5 Rbf8 41. Rd7+ Kg6) 35. Rxg7+ Kxg7 36. b4? { (1.86 → -0.77) Mistake. The best move was Ka2. } (36. Ka2 Kg6 37. b4 Ra8 38. Kb3 h5 39. b5 g4 40. fxg4 hxg4 41. Rg1 Kg5 42. a4 Kf4 43. Kb4 g3 44. a5 Kf3) 36... Rxa3 37. Kb2?! { (-0.62 → -1.35) Inaccuracy. The best move was Kc2. } (37. Kc2 Rxf3 38. Rb1 g4 39. b5 Rf8 40. b6 Rb8 41. b7 h5 42. Kd3 Kf6 43. Rb6+ Kg5 44. Ke3 h4 45. Rb5 h3 46. Rxe5+ Kf6) 37... Rxf3 38. Rd1?! { (-0.98 → -1.88) Inaccuracy. The best move was b5. } (38. b5 g4 39. Kc2 Kg6 40. b6 Rf7 41. Kc3 Rb7 42. Rb1 h5 43. Kc4 h4 44. Kd5 g3 45. Kc6 Rb8 46. Kc7 Rh8 47. Rg1 Kg5) 38... Re3? { (-1.88 → -0.43) Mistake. The best move was g4. } (38... g4 39. b5 h5 40. b6 Rf8 41. Kc3 Rb8 42. Rb1 h4 43. Kd2 h3 44. Rg1 Rxb6) 39. b5 Rxe4 40. b6?? { (-0.55 → -4.05) Blunder. The best move was Kb3. } (40. Kb3 Rf4 41. b6 g4 42. b7 Rf8 43. Kc4 Rb8 44. Rb1 h5 45. Kd5 g3 46. Kxe5) 40... Rb4+ 41. Kc3 Rxb6 42. Rd5 Rc6+ 43. Kd3 Kf6 44. Ke4? { (-4.05 → -5.15) Mistake. The best move was Rd8. } (44. Rd8 Kf5 45. Rh8 g4 46. Ke3 Rc3+ 47. Kf2 Rh3 48. Kg2 h5 49. Rf8+ Ke4 50. Rg8 Kf4 51. Rf8+ Ke3 52. Rg8 e4 53. Rg7 Kf4) 44... Rc4+ 45. Kd3?? { (-4.99 → Mate in 17) Checkmate is now unavoidable. The best move was Ke3. } (45. Ke3 h5 46. Rd8 h4 47. Rf8+ Ke6 48. Rh8 Kf5 49. Kd3 Ra4 50. Ke2 Kf4 51. Rf8+ Kg4 52. Rb8 h3 53. Kf2 Ra1 54. Rb4+ e4) 45... Rd4+ 46. Rxd4 exd4 47. Kxd4 Kf5 48. Ke3 Kg4 49. Kf2 h5 50. Kg2 h4 51. Kh2 Kf4 52. Kh3 g4+ 53. Kxh4 g3 54. Kh3 Kf3 55. Kh4 g2 56. Kh3 g1=Q 57. Kh4 Qg4# { White is checkmated } 0-1
 +
</pgn>
 +
 +
== Camilo (952) vs Amir (990) ==
 +
 +
An equilibrated game, that Black loses on time, allowing not to be mated next move. A couple of times, the battle swung back to a possible win for both sides and even came to a nice confrontation of strong positional advantage against strong material advantage after 19. dxc4??, although the last attack from Camilo, stabbing the rook, was a decisive one. Interestingly, 17. Rxe6+ (where even a mate was announced) is not a mistake, as it allows to pursue the same idea with the other rook, which did not happen in the game, illustrating again how weak is the move that follows a supposed mistake on the board. White wins 7 points, Black looses 35 in this provisional game.
 +
 +
<pgn>
 +
[Event "Casual game"]
 +
[Site "http://lichess.org/HTe1UFKX"]
 +
[Date "2015.03.20"]
 +
[White "Camilo"]
 +
[Black "Amir"]
 +
[Result "1-0"]
 +
[WhiteElo "?"]
 +
[BlackElo "?"]
 +
[PlyCount "44"]
 +
[Variant "Standard"]
 +
[TimeControl "-"]
 +
[ECO "C00"]
 +
[Opening "French Defense, General"]
 +
[Annotator "lichess.org"]
 +
 +
1. e4 e6 { French Defense, General } 2. Bc4 c6 3. Nf3 Nh6?! { (-0.21 → 0.57) Inaccuracy. The best move was d5. } (3... d5 4. exd5 exd5 5. Be2 Nf6 6. d3 Bd6 7. c4 O-O 8. Nc3 Be6 9. O-O Nbd7 10. Be3 Ng4 11. cxd5 Nxe3 12. fxe3 Bxd5 13. d4) 4. d3 Bd6?! { (0.08 → 0.96) Inaccuracy. The best move was d5. } (4... d5 5. Bg5 Qd7 6. exd5 cxd5 7. Bb3 Nc6 8. O-O Nf5 9. c4 dxc4 10. Bxc4 h6 11. Bf4 Be7 12. Nc3 O-O 13. Bb5 f6 14. Ne4) 5. Bg5 Be7 6. O-O?? { (0.60 → -2.53) Blunder. The best move was Bxh6. } (6. Bxh6 gxh6 7. Bb3 d5 8. Nc3 Nd7 9. O-O h5 10. Qd2 b5 11. exd5 exd5) 6... f6?? { (-2.53 → 1.27) Blunder. The best move was Bxg5. } (6... Bxg5 7. Nxg5 Qxg5 8. d4 d5 9. Bd3 dxe4 10. Bxe4 Nf5 11. c3 O-O 12. Nd2 Nd7 13. Re1 Rd8 14. Nf3 Qh5 15. a3 g6 16. Nd2) 7. Bxh6 gxh6 8. Nh4 f5?? { (0.79 → 4.23) Blunder. The best move was O-O. } (8... O-O 9. Nf5 Kh8 10. Nxe7 Qxe7 11. Bb3 Na6 12. Nd2 d5 13. c3 b6 14. Re1 Bb7 15. d4 Nc7 16. a3 Qg7 17. g3 e5 18. Qh5) 9. Qh5+ Kf8 10. Qxh6+? { (4.25 → 1.94) Mistake. The best move was Nxf5. } (10. Nxf5 d5 11. exd5 cxd5 12. Qxh6+ Ke8 13. Nxe7 Qxe7 14. Bxd5 Kd8 15. Nc3 Nc6 16. Rae1 Rg8) 10... Ke8? { (1.94 → 4.27) Mistake. The best move was Kg8. } (10... Kg8 11. Nxf5 Bf8 12. Qf4 d5 13. exd5 cxd5 14. Qg3+ Kf7 15. Ne3 dxc4 16. Nxc4 Bg7 17. Nc3 Kg8 18. Ne4 Nc6 19. Rfe1 Nb4 20. Ncd6) 11. Nc3?? { (4.27 → -0.27) Blunder. The best move was Qh5+. } (11. Qh5+ Kf8 12. Nxf5 d5 13. exd5 cxd5 14. Qh6+ Ke8 15. Nxe7 Qxe7 16. Bxd5 Kd8 17. Nc3 Rg8 18. Be4 Nc6 19. d4 Qg5 20. Qxg5+ Rxg5) 11... Bxh4 12. exf5 Bg5?? { (-0.55 → 2.76) Blunder. The best move was Qg5. } (12... Qg5 13. Qxg5 Bxg5 14. fxe6 dxe6 15. Ne4 Be7 16. c3 Na6 17. f4 Nc7 18. Rae1 Nd5 19. Ng5 Nxf4 20. Nxe6 Nxe6 21. Bxe6 Rf8 22. Bb3) 13. Qh5+ Ke7?? { (2.81 → 6.39) Blunder. The best move was Kf8. } (13... Kf8 14. fxe6 dxe6 15. Ne4 Bf4 16. g3 b5 17. Bb3 Rg8 18. Qf3 Qh4 19. Kh1 Qg4 20. Qxf4+ Qxf4 21. gxf4 Rg4 22. a4 Rxf4 23. axb5) 14. Qxg5+ Ke8 15. Qg7? { (6.38 → 4.91) Mistake. The best move was Qh5+. } (15. Qh5+ Ke7 16. fxe6 dxe6 17. Ne4 Qf8 18. Qg5+ Ke8 19. Qe5 Kd8 20. Ng5 Rg8 21. Rfe1 Bd7) 15... Rf8 16. Rae1? { (4.67 → 3.29) Mistake. The best move was fxe6. } (16. fxe6 dxe6 17. Rae1 Qe7 18. Qd4 Na6 19. Bxa6 bxa6 20. Ne4 e5) 16... d5? { (3.29 → 5.27) Mistake. The best move was Rxf5. } (16... Rxf5 17. Qxh7 Qe7 18. Qg8+ Rf8 19. Qg3 Kd8 20. d4 d6 21. a3 Na6 22. Ne4 Kc7 23. Ng5 Rf6 24. Qb3 Qg7 25. f4 d5 26. Bxa6) 17. Rxe6+ Bxe6 18. fxe6?? { (5.06 → 1.43) Blunder. The best move was Re1. } (18. Re1 Rf6 19. Rxe6+ Rxe6 20. fxe6 Qe7 21. Qg8+ Qf8 22. Qxh7 Qe7 23. Qg8+ Qf8 24. Qg6+ Kd8 25. Bxd5 Nd7 26. exd7 cxd5 27. Qh5 Qe7) 18... dxc4? { (1.43 → 3.38) Mistake. The best move was Qe7. } (18... Qe7 19. Qe5 dxc4 20. Ne4 c3 21. Nd6+ Kd8 22. Re1 b6 23. bxc3 Na6 24. g4 Nc7 25. Nf5 Rxf5 26. gxf5 Ne8 27. d4 Kc8 28. d5) 19. dxc4?? { (3.38 → 0.00) Blunder. The best move was Qxb7. } (19. Qxb7 cxd3 20. Qxa8 Qb6 21. Na4 Qc7 22. cxd3 Ke7 23. Rc1 Kxe6 24. Nc5+ Kf7 25. Ne4 Kg8 26. Rc3 Qa5 27. a3 Qb6 28. b4 Rd8) 19... Qf6?? { (0.00 → 5.48) Blunder. The best move was Qe7. } (19... Qe7 20. Qe5 Rf6 21. Re1 Na6 22. Ne4 Rxe6 23. Qh8+ Qf8 24. Qxh7 Rd8 25. Qh5+ Ke7 26. Qh7+ Ke8) 20. Qxb7 Na6?? { (4.72 → Mate in 1) Checkmate is now unavoidable. The best move was Qe7. } (20... Qe7 21. Qxa8 Qc7 22. Re1 Ke7 23. Re3 Rd8 24. Rh3 Kxe6 25. Rh6+ Kf5 26. g3 Rd2) 21. Qxa8+?! { (Mate in 1 → 15.68) Lost forced checkmate sequence. The best move was Qd7#. } (21. Qd7#) 21... Qd8 22. Qxc6+ Qd7?! { Black loses on time (42.36 → Mate in 1) Checkmate is now unavoidable. The best move was Ke7. } (22... Ke7 23. Nd5+ Qxd5 24. cxd5 Kf6 25. Qxa6 Kg7 26. Qxa7+ Kg8 27. d6 h5 28. e7 Re8) 1-0
 
</pgn>
 
</pgn>
  

Revision as of 17:06, 20 March 2015

Contents

PolaChess

The PolaChess tournament is the ongoing PolaFlow chess tournament. It is a Round-robin, 15 minutes time, 0 increment tournament played during coffee time. Both a PolÆlO rating and centipawns are computed. The person in charge is Juan Pablo.

Polachess-first-game.jpeg

PolÆlO

An Elo is computed, with a $K=32$ constant and with 5 provisional ratings for players not part of the PolaChess pool (we assumed established ratings for everybody who joined the tournament at $t=0$, which is not a problem as their ratings will converge but we need to take into account occasional games as provided by visitors). Specifically, the $K$ factor is scaled by $3/\big(4(5-i)\big)$ (i.e., down) for the established player and by $3-(i-1)/2$ (i.e., up) for his opponent for the first $i<5$ games of the new player, after which point $K=32$ again. Explicitly, the $K$ constants for the new player go:

96, 80, 64, 48, and 32 thereafter

while it goes, for the established player:

6, 8, 12, 24, and 32 thereafter

Games

Carlos (1000) vs Camilo (1000)

13 February (2015)

Fabrice (1000) vs David (1000)

16 February (2015)

Carlos (1016) vs Stefan (1000)

17 February (2015) (photo)

Pablo (1000) vs Fabrice (1016)

18 February (2015)

Santiago (1000) vs Carlos (1031)

Camilo (984) vs Stefan (985)

David (984) vs Carlos (1046)

23 February (2015) — Blunderful.

Stefan (1001) vs Pablo (985)

Santiago (985) vs David (1003)

Pablo (970) vs David (1018)

David (1032) vs Fabrice (1031)

Fabrice (1047) vs Stefan (1016)

The end was not recorded as it was too fast for the transcript (Pablo). Apparently an illegal move was made with a rook. The game ended in checkmate in a race to flag for time.

David (1016) vs Stefan (1001)

Fabrice (1062) vs Carlos (1027)

Pablo (956) vs Camilo (968)

Camilo wins on time. Interestingly, 24. Qd6+?! is not a blunder (only a mistake). The next move, however, is a proper queen panick moment.

Stefan (1018) vs Fabrice (1076)

The end was not recorded as it was too fast for the transcript (Pablo). The game ended in checkmate shortly after the last position shown.

Santiago (970) vs Camilo (983)

Shortest game so far, which left us time to play a king of the hill variation (which Camilo won, against Fabrice, by checkmate on a too daring king).

Santiago (987) vs Pablo (941)

In a raging fury against our Colombian community, Santiago proceeds to calmly walk his way back up the ladder of the tournament, methodically resisting the attacks of White who, in their traditional style, succumb to their own pressure and split out to surrender their queen on an otherwise leading position. The shat queen moment—this move of the game where Juan Pablo becomes chess-blind and positions his dame in front of a pawn, bishop or right below the roofs of a knight—occurred here on the (Friday the) 13th move. It was then just a matter of carefully moving the heavy Black artillery left around, with little but enough time left to enforce checkmate. Playing with psychology on his side, Santiago allowed himself the occasional glance through the window, à la Bobby, which was a nice touch.

Camilo (966) vs David (999)

A game of tension, of tension going too far. First 10 moves or so have been slowly, carefully considered by both sides and getting the pot to almost boiling point. Then David blunders his queen away, 11. Bd3?? Even then, to strike mercilessly, Camilo took his time, and brought the heavy knight falling with all the weight of an actual horse on the square that meant defeat for our French contender. But there's nothing that you can do to vex David's attitude. He regarded this move as mere trifle, displaced his king and carried on with a face of steel. Time was still equal. But with time passing and nothing to loose, it was easy for Black to arrogantly pretend they could still play, and with the face of conquest, advance a minuscule little pawn towards recovering the wasted queen. White started to play faster (which is good) and with too much confidence (which is not), with some irrational fixation on delivering check. See 22. Qc4+?, letting the knight go away. At this point, or not too far, a girl who popped out of nowhere tried to get under the table to reach something below Camilo's bench. Upon inquiry, and thankfully, it turned out to be only for a coin that rolled all the way from the vending machine to our competitor. We had to pay the girl to go away. Too late. On 26th move, the blunder of the day changed the game's fate. In a mate-in-5 position, when everybody started to relax and think about the coin below the bench, Camilo spin out of control: first sacrifice of a bishop, 26. Bxa6+? then throwing the queen in its wake, 27 Qxa6+?? The move was stopped in mid-air, in a frozen time and space with only a resounding "too late, too late" from David, detonating in a cafetaria getting a moment's interest into an apparent scandal. Then in time trouble, psychologically ruined, pursuing illusory checkmates through pointless checks, only defeat could follow for White, who lost on time.

Fabrice (1089) vs Javier (1000)

We have a new player, Javier, also the strongest one (playing in a club), so this is great news for our competition. Javier enters with the provisional rating rules, so his rating changes a lot, sinking to 964 as he lost the game, while Fabrice's (yours truly, writing this comment) changes little, winning only 2 points in what was the most difficult game so far. Actually the game was a win for Black, who had a mate position in move 31. Qg4# Chess being a game where a single mistake can overturn everything, since 31. g6+?? was played instead, a Berezina was turned into a Campo Formio. A mate had been announced, and as I had seen the mate with queen, I accepted the claim as valid, but the Referee (Pablo) observed this was not checkmate, so the game carried on, and after forcing the exchange of queens, Black was in the mental despair situation and did not try to fight against the rook. A careless knight move led to his capture on discovering a check, and Black resigned. This is a victory from a lost game. But aren't many victories like that? (especially when involving French players?) Like this, everybody's a winner: the good chess player, who loses on a blunder and the loser, who wins as a patzer. To make things worst, on move 15. a super-castling 15. O-O-O-O was attempted, conveniently getting the king on d1, but of course the referee objected, and everybody laughed his ass off, not letting me add another quantum move up my sleeve of illegal tricks. Still, the game continued.

The main feature of the game as far as I am concerned is my move 7. c3?? which the audience took for what it was: a blunder, but assuming a stupid oversight, while it was really a gambit. Which one? This is the variation I had in mind (you can play it in the game below as the 2nd variation):

7. Nh2 h6xg5 (opening the column)
8. h4xg5 (menacing to take back the sacrificed piece)

The knight has ultimately to move, leaving the Black king naked to an attack from the White queen supported by the king's bishop, and pinned by the White king's bishop. This leads to aggressive attack that, in time battle, may be worth the small loss in material. I'm fairly sure in the queenside castle of Black, this provides an actual advantage (my experience is that strong players tend to reject this gambit). Here, though, the knight was in the way, Javier is a good player, so he had time to develop his pieces to turn this hurried and lame attack into a sound counter-attack. In fact, even if I hadn't shat the horse in the middle, this was a mistake, since, so the computer analyzes:

8. ... d5 (exchanging knight for bishop)
9. Bb3 (holding the pin) Nh7 (keeping the knight)
10. g6

The queen still looks dangerous but the analysis shows that it's still better for Black.

Stefan (1005) vs Amir (1000)

Another new player, Amir Rahmani, joined the tournament to defend the colors of Isfahan against Stefan who took a bye from our club player till Wednesday. A strange opening and a dangerous unconvering of the king-side let Stefan, who was mentally and physically preparing himself to destroy Javier, have an easy win. Tomorrow, Amir vs Juan Pablo. Bets are opened. Will the "shat queen" get in the way of another assured victory? Or will Amir toy again with irregular openings?

Amir (953) vs Juan Pablo (927)

A late PolaChess session today, since Amir was looking for his new place to live (which he found, by the way). Everybody was expecting a bold queen sacrifice from Juan Pablo, which, not disappointingly, duly came on precisely the traditional 12th move. We let you discover this fantastic queen blunder of majestic proportion which, as it should to have all its savor, was played on a strong, if not winning, position.

Polachess-17March2015.jpeg

Stefan (1008) vs Javier (964)

A tense game with a leading White who started to make little mistakes then bigger mistakes then a fatal mistake that let Black recover from a lost piece to a winning position. The message here is: Javier can blunder, so he's reachable, but only once, so remain careful.

Camilo (952) vs Amir (990)

An equilibrated game, that Black loses on time, allowing not to be mated next move. A couple of times, the battle swung back to a possible win for both sides and even came to a nice confrontation of strong positional advantage against strong material advantage after 19. dxc4??, although the last attack from Camilo, stabbing the rook, was a decisive one. Interestingly, 17. Rxe6+ (where even a mate was announced) is not a mistake, as it allows to pursue the same idea with the other rook, which did not happen in the game, illustrating again how weak is the move that follows a supposed mistake on the board. White wins 7 points, Black looses 35 in this provisional game.

Games to come

Based on Computer's random sampling. Games that cannot take place are either skipped of flushed to the end.

Decided at the last minute on people's availability.

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