Seven piece tablebases
05 Mar '15 00:43Apparently apart from 6 pieces against a lone king they have been calculated and put on a website [1]. The problem is that one has to buy a product to get a years subscription which I don't want to do just for the sake of finding out the theoretical result in a game I've just finished. If someone has subscribed, or otherwise have access to an oracle, do they mind looking this one up. Alternatively what's your opinion, I won, but should I have from the following position? Could my opponent have held a draw?
The position when we entered the seven piece endgame was:
And the full game, with a few comments is:
[Event "Challenge"]
[Site "http://www.playtheimmortalgame.com"]
[Date "2015.01.12"]
[Round "?"]
[White "DeepThought"]
[Black "burningbush"]
[Result "1-0"]
[WhiteRating "1693"]
[BlackRating "1741"]
[ECO "C02s"]
[EventDate "2015.01.12"]
[EndDate "2015.03.04"]
[WhiteElo "1693"]
[BlackElo "1741"]
[GameId "10997331"]
1. e4 e6 2. d4 d5 3. e5 {The advance variation of the French Defence, I used to play 3. Nc3 here, almost invariably leading to a Poisoned Pawn variation. Now I'm more likely to go for the exchange variation. But here I thought I'd try this out. Since I've started playing the French as Black and it's good to get the idea of what white is trying to acheive in lines I have to face.} c5 4. c3 Qb6 5. Nf3 Nc6 6. Bd3 {The Milner-Barry gambit. Black loses his queen after 6. ... cxd4 7. cxd4 Nxd4 8. Nxd4 Qxd4 9. Bb5+} cxd4 7. cxd4 Bd7 {Now the pawn really is en prise.} 8. O-O Nxd4 9. Nxd4 Qxd4 10. Nc3 a6 11. Kh1 Qxe5 {This position has been reached 6 times in games on my database. In three of them white played 12. f4 and lost. In the other three white played 12. Re1 and won, so...} 12. Re1 Qd6 13. Qf3 Bc6 14. Bf4 Qd7 15. Rad1 Be7 {Up until now we've played the same moves as in Marjan Crepan v Anna Rudolf, Pula, 2001. In that game Rudolf played 15. ... Nf6 and eventually lost.} 16. Qg3 Bf6 17. Bf5 {I didn't know what to do with the position, black's pawns are pretty imposing, but there are a lot of pins to exploit.} Ne7 18. Bh3 O-O 19. Ne4 Ng6 20. Nxf6+ gxf6 21. Bh6 Rfe8 22. Bg4 Rac8 23. h4 Qc7 {This is a complete pain. I don't want to swap queens for obvious reasons, but don't really have anywhere to put the thing either.} 24. Re3 Qxg3 25. Rxg3 Kh8 26. h5 Ne5 {Now I've got problems. The queens are off, black is a couple of pawns up and one of them is a connected passed pawn. I'm losing badly but have a tactical trick to spoil his pawn structure, so I may as well try it.} 27. Bg7+ Kxg7 28. Bxe6+ Kh8 {I thought 28. ... Kh6 was better here.} 29. Bxc8 Rxc8 {Now most of black's pawns are isolated. The problem now for me is I've got two rooks and he has a rook and two minor pieces so I can't just sacrifice a piece for the central pawn.} 30. Rd4 Rg8 31. Re3 {I didn't want to swap rooks.} Rg5 32. Rh3 Ng4 33. Kg1 Bd7 34. f4 Rg8 {Black wanted to maintain the X-ray pressure againt my rook, but I thought he was better with 34. ... Rf5 a I can grab the central pawn now and it's starting to look like I can get a draw after all.} 35. Rxd5 Re8 36. Rd1 {If 36. Rxd7 Re1#} Re2 37. h6 {Hoping for back rank tricks.} Kg8 {I still can't take the bishop or threaten much so I thought black could afford to grab the b-pawn, when my position starts to look difficult again.} 38. Rhd3 Bc6 39. Rd8+ Re8 {This turns the tide as now I get the b-pawn. I thought black should block with the bishop.} 40. Rxe8+ Bxe8 41. Rd8 Kf8 42. Rb8 Nxh6 43. Rxb7 Kg7 44. g3 Ng4 45. b3 Bb5 46. a4 Be2 47. b4 Kg6 48. b5 axb5 49. axb5 Bxb5 50. Rxb5 {By now I was starting to think I could win.} h6 51. Kg2 f5 52. Kh3 {I'd hoped to be able to get at the h pawn but it isn't possible. We spend some time moving back and forth here while I work that out.} Nf6 53. Kh4 Ng4 54. Rb6+ Nf6 55. Ra6 Kg7 56. Kh3 Kg6 57. Kg2 Kg7 58. Kf3 Nh5 {This let's me change the position. Black should probably not let me do this.} 59. g4 fxg4+ 60. Kxg4 Nf6+ {The position in the diagram, the question being what is the theoretical result?} 61. Kf5 Nd7 62. Rd6 {I want my king out of the way of the pawn, but can't here as I either end up repeating or getting forked.} Nc5 63. Kg4 Ne4 64. Rc6 Nf6+ 65. Kf5 Nd7 66. Ke4 Nf6+ 67. Ke5 Nd7+ 68. Kf5 Nf8 69. Kg4 Ng6 70. Ra6 {70. f5 Ne5+} Nf8 71. f5 {At last!} Nd7 72. Kf4 Nf6 73. Ke5 Ng4+ 74. Kd5 {I'm trying to get my king to the seventh rank without letting his to the fifth. He saves me the trouble.} h5 {Good idea, it keeps the knight protected and I have to keep a nervous eye on that pawn.} 75. Ke4 f6 {This is a mistake, the king either goes to the back rank and gets cut off or stuck on h6. 76. ... Nh6 might keep him alive.} 76. Ra7+ Kh6 77. Kf4 Ne5 78. Re7 h4 {Not great, but the king can't move and if the knight moves it allows the same trick as in the game.} 79. Rb7 {Black's in zugzwang. He can't move the king and pushing the pawn leaves him overstretched. Knight moves don't help.} Nc4 80. Rf7 {This is game over as after 80. ... h3 81. Rxf6+ 82. K moves and I have enough time to get my rook back to stop his pawn promoting.} Ne5 81. Rxf6+ 1-0
[1] http://chessok.com/?page_id=27966
The position when we entered the seven piece endgame was:
And the full game, with a few comments is:
| EVENT | Challenge |
| SITE | http://www.playtheimmortalgame.com |
| DATE | 2015.01.12 |
| ROUND | ? |
| WHITE | DeepThought |
| BLACK | burningbush |
| RESULT | 1-0 |
| WHITEELO | 1693 |
| BLACKELO | 1741 |
| ECO | C02s |
| EVENTDATE | 2015.01.12 |
[Event "Challenge"]
[Site "http://www.playtheimmortalgame.com"]
[Date "2015.01.12"]
[Round "?"]
[White "DeepThought"]
[Black "burningbush"]
[Result "1-0"]
[WhiteRating "1693"]
[BlackRating "1741"]
[ECO "C02s"]
[EventDate "2015.01.12"]
[EndDate "2015.03.04"]
[WhiteElo "1693"]
[BlackElo "1741"]
[GameId "10997331"]
1. e4 e6 2. d4 d5 3. e5 {The advance variation of the French Defence, I used to play 3. Nc3 here, almost invariably leading to a Poisoned Pawn variation. Now I'm more likely to go for the exchange variation. But here I thought I'd try this out. Since I've started playing the French as Black and it's good to get the idea of what white is trying to acheive in lines I have to face.} c5 4. c3 Qb6 5. Nf3 Nc6 6. Bd3 {The Milner-Barry gambit. Black loses his queen after 6. ... cxd4 7. cxd4 Nxd4 8. Nxd4 Qxd4 9. Bb5+} cxd4 7. cxd4 Bd7 {Now the pawn really is en prise.} 8. O-O Nxd4 9. Nxd4 Qxd4 10. Nc3 a6 11. Kh1 Qxe5 {This position has been reached 6 times in games on my database. In three of them white played 12. f4 and lost. In the other three white played 12. Re1 and won, so...} 12. Re1 Qd6 13. Qf3 Bc6 14. Bf4 Qd7 15. Rad1 Be7 {Up until now we've played the same moves as in Marjan Crepan v Anna Rudolf, Pula, 2001. In that game Rudolf played 15. ... Nf6 and eventually lost.} 16. Qg3 Bf6 17. Bf5 {I didn't know what to do with the position, black's pawns are pretty imposing, but there are a lot of pins to exploit.} Ne7 18. Bh3 O-O 19. Ne4 Ng6 20. Nxf6+ gxf6 21. Bh6 Rfe8 22. Bg4 Rac8 23. h4 Qc7 {This is a complete pain. I don't want to swap queens for obvious reasons, but don't really have anywhere to put the thing either.} 24. Re3 Qxg3 25. Rxg3 Kh8 26. h5 Ne5 {Now I've got problems. The queens are off, black is a couple of pawns up and one of them is a connected passed pawn. I'm losing badly but have a tactical trick to spoil his pawn structure, so I may as well try it.} 27. Bg7+ Kxg7 28. Bxe6+ Kh8 {I thought 28. ... Kh6 was better here.} 29. Bxc8 Rxc8 {Now most of black's pawns are isolated. The problem now for me is I've got two rooks and he has a rook and two minor pieces so I can't just sacrifice a piece for the central pawn.} 30. Rd4 Rg8 31. Re3 {I didn't want to swap rooks.} Rg5 32. Rh3 Ng4 33. Kg1 Bd7 34. f4 Rg8 {Black wanted to maintain the X-ray pressure againt my rook, but I thought he was better with 34. ... Rf5 a I can grab the central pawn now and it's starting to look like I can get a draw after all.} 35. Rxd5 Re8 36. Rd1 {If 36. Rxd7 Re1#} Re2 37. h6 {Hoping for back rank tricks.} Kg8 {I still can't take the bishop or threaten much so I thought black could afford to grab the b-pawn, when my position starts to look difficult again.} 38. Rhd3 Bc6 39. Rd8+ Re8 {This turns the tide as now I get the b-pawn. I thought black should block with the bishop.} 40. Rxe8+ Bxe8 41. Rd8 Kf8 42. Rb8 Nxh6 43. Rxb7 Kg7 44. g3 Ng4 45. b3 Bb5 46. a4 Be2 47. b4 Kg6 48. b5 axb5 49. axb5 Bxb5 50. Rxb5 {By now I was starting to think I could win.} h6 51. Kg2 f5 52. Kh3 {I'd hoped to be able to get at the h pawn but it isn't possible. We spend some time moving back and forth here while I work that out.} Nf6 53. Kh4 Ng4 54. Rb6+ Nf6 55. Ra6 Kg7 56. Kh3 Kg6 57. Kg2 Kg7 58. Kf3 Nh5 {This let's me change the position. Black should probably not let me do this.} 59. g4 fxg4+ 60. Kxg4 Nf6+ {The position in the diagram, the question being what is the theoretical result?} 61. Kf5 Nd7 62. Rd6 {I want my king out of the way of the pawn, but can't here as I either end up repeating or getting forked.} Nc5 63. Kg4 Ne4 64. Rc6 Nf6+ 65. Kf5 Nd7 66. Ke4 Nf6+ 67. Ke5 Nd7+ 68. Kf5 Nf8 69. Kg4 Ng6 70. Ra6 {70. f5 Ne5+} Nf8 71. f5 {At last!} Nd7 72. Kf4 Nf6 73. Ke5 Ng4+ 74. Kd5 {I'm trying to get my king to the seventh rank without letting his to the fifth. He saves me the trouble.} h5 {Good idea, it keeps the knight protected and I have to keep a nervous eye on that pawn.} 75. Ke4 f6 {This is a mistake, the king either goes to the back rank and gets cut off or stuck on h6. 76. ... Nh6 might keep him alive.} 76. Ra7+ Kh6 77. Kf4 Ne5 78. Re7 h4 {Not great, but the king can't move and if the knight moves it allows the same trick as in the game.} 79. Rb7 {Black's in zugzwang. He can't move the king and pushing the pawn leaves him overstretched. Knight moves don't help.} Nc4 80. Rf7 {This is game over as after 80. ... h3 81. Rxf6+ 82. K moves and I have enough time to get my rook back to stop his pawn promoting.} Ne5 81. Rxf6+ 1-0
[1] http://chessok.com/?page_id=27966
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