7-Piece position

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Nordlandia
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7-Piece position

Post by Nordlandia »

[Event "YourNextMove GCT Blitz 2016 round 01"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Topalov"]
[Black "Anand"]
[Result "*"]
[PlyCount "118"]

1. c4 e5 2. Nc3 Bb4 3. Nd5 Bc5 4. Nf3 c6 5. Nc3 d6 6. e3 Bb4 7. Qc2 Nf6 8. a3
Bxc3 9. Qxc3 O-O 10. d3 Re8 11. Be2 e4 12. Nd2 d5 13. O-O exd3 14. Bxd3 Nbd7
15. cxd5 Ne5 16. Be2 Nxd5 17. Qc2 Bg4 18. Bxg4 Nxg4 19. Nf3 Qf6 20. Bd2 Qg6 21.
Qb3 Rab8 22. Rad1 Ngf6 23. Bc1 h6 24. Rd4 Ne4 25. Rfd1 Re6 26. Qc2 Rbe8 27. b4
Rf6 28. Nh4 Rxf2 29. Rxe4 Rxg2+ 30. Qxg2 Qxe4 31. Qxe4 Rxe4 32. Nf5 Re5 33. Rf1
f6 34. Kg2 Nb6 35. Nd6 Re7 36. Rd1 Rd7 37. Rd2 Nd5 38. Nf5 g6 39. Nxh6+ Kg7 40.
e4 Ne3+ 41. Kf3 Rxd2 42. Bxd2 Nc4 43. Bc1 Nxa3 44. Nf5+ gxf5 45. Bxa3 fxe4+ 46.
Kxe4 Kg6 47. Kf4 b6 48. Bc1 a5 49. bxa5 bxa5 50. Ba3 Kh5 51. Kg3 f5 52. Be7 a4
53. h3 Kg6 54. Kf4 Kh5 55. Kg3 Kg6 56. Ba3 Kg5 57. Bc1+ Kh5 58. Ba3 Kg5 59.
Bc1+ Kh5 *

Apparently Lomo7 get stuck on this position :arrow:

FinalGen states it's a win or draw in white's favour. It required 6 GB and about 15 minutes to generate.

[d]8/8/2p2pk1/p7/5K2/8/7P/2B5 w - - 0 50
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Marek Soszynski
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Location: Birmingham, England

Re: 7-Piece position

Post by Marek Soszynski »

The online tablebases report "Serice overloaded. Try again later" [sic]. Maybe that's why they're stuck.
Marek Soszynski
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Nordlandia
Posts: 2845
Joined: Fri Sep 25, 2015 9:38 pm
Location: Sortland, Norway

Re: 7-Piece position

Post by Nordlandia »

Marek Soszynski wrote:The online tablebases report "Serice overloaded. Try again later" [sic]. Maybe that's why they're stuck.
Server maintenance perhaps?

Looks kinda drawish though.
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tpoppins
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Joined: Tue Nov 24, 2015 9:11 pm
Location: upstate

Re: 7-Piece position

Post by tpoppins »

Clearly a draw. The bishop must keep an eye on the black a- and c-pawns and the king guard the white h-pawn, without which there is no win. As soon as the white king approaches the f-pawn the black king heads for the h-pawn. If White tries to protect it with the bishop Black gives up the a-pawn at an opportune moment.

If the white king heads for the queenside it's the f-pawn that Black will give up for the h-pawn. Latest SF shows there's no progress to be made:

Code: Select all

Analysis by Stockfish 190616 64 POPCNT:

<snip>
50.Be3 a4 51.Bc5 Kh5 52.Kg3 Kg5 53.Bf8 Kf5 54.Be7 Kg5 55.Bd6 Kf5 56.Kh4 Ke4 57.Kg4 f5+ 58.Kg3 Kd5 59.Ba3 Ke4 60.Be7 Ke3 61.Bd6 Ke4 62.Kf2 Kd5 63.Ba3 Ke4 64.Be7 Kf4 65.h3 Ke4 66.Ba3 Kf4 67.Bc5 Ke4 68.Be7 Kf4 69.Bd6+ Ke4 70.h4 f4 71.Kg2 f3+ 72.Kg3 
  +/=  (0.64)   Depth: 37/46   00:00:07  54973kN
50.Ba3 
  +/-  (0.71 ++)   Depth: 38/47   00:00:09  109MN
50.Ba3 
  +/-  (0.78 ++)   Depth: 38/47   00:00:09  109MN
50.Bd2 a4 51.Bb4 Kh5 52.Kg3 Kg6 53.Kg4 Kh6 54.Bd6 Kg6 55.Bc5 Kh6 56.Be7 Kg6 57.Bd6 Kh6 58.Ba3 Kg6 59.Be7 Kf7 60.Bb4 Kg6 61.Ba3 f5+ 62.Kf4 Kh5 63.Be7 Kg6 64.Bd6 Kh5 65.Kg3 Kg6 66.Ba3 Kg5 67.Be7+ Kh5 68.Bc5 f4+ 69.Kh3 Kg5 70.Be7+ Kf5 71.Bc5 
  +/-  (0.78)   Depth: 38/47   00:00:09  122MN
50.Bd2 a4 51.Bb4 Kh5 52.Kg3 Kg6 53.Kg4 Kh6 54.Bd6 Kg6 55.Bc5 Kh6 56.Be7 Kg6 57.Bd6 Kh6 58.Ba3 Kg6 59.Be7 Kf7 60.Bb4 Kg6 61.Ba3 f5+ 62.Kf4 Kh5 63.Kg3 Kg5 64.Bf8 Kg6 65.Bb4 Kg5 66.Be7+ Kh5 67.Kf4 c5 68.Kxf5 a3 69.Kf4 a2 70.Bf6 c4 71.Kg3 Kg6 72.Bc3 Kf5 73.h4 Ke4 74.h5 
  +/-  (0.78)   Depth: 39/53   00:00:11  172MN

<snip>

50.Bd2 a4 51.Bb4 Kh5 52.Kg3 Kg6 53.Kg4 Kh6 54.Bd6 Kg6 55.Bc5 f5+ 56.Kg3 Kf6 57.Kf4 Kg6 58.Bd6 Kf6 59.Ke3 Kg5 60.Kf2 Kg4 61.Kg2 Kg5 62.Kg3 Kg6 63.Kf3 Kg5 64.Be7+ Kh5 65.Kg3 Kg6 66.Kf4 Kf7 67.Ba3 Kf6 68.Bd6 Kg6 69.h3 Kh5 70.Kf3 Kh4 71.Kg2 Kg5 72.Be7+ Kh5 73.Kf2 Kg6 74.Kg3 Kf7 75.Bb4 Kg6 76.Kf4 Kh5 77.Kf3 Kh4 78.Kg2 Kh5 79.Be7 Kh6 80.Kf3 Kh5 81.Kf4 a3 82.Kxf5 a2 83.Bf6 a1R 84.Bxa1 
  +/-  (0.78)   Depth: 58/69   00:08:48  16238MN
50.Bd2 a4 51.Bb4 Kh5 52.Kg3 Kg6 53.Kg4 Kh6 54.Bd6 Kg6 55.Bc5 f5+ 56.Kg3 Kf6 57.Kf4 Kg6 58.Bd6 Kf6 59.Ke3 Kg5 60.Kf2 Kg4 61.Kg2 Kg5 62.Kg3 Kg6 63.Kf3 Kg5 64.Be7+ Kh5 65.Kg3 Kg6 66.Kf4 Kf7 67.Ba3 Kf6 68.Bd6 Kg6 69.h3 Kh5 70.Kf3 Kh4 71.Kg2 Kg5 72.Kg3 Kg6 73.Kh4 Kf6 74.Bb4 Ke5 75.Kg3 Ke4 76.Be7 Kd5 77.Kf4 Ke6 78.Bc5 Kf6 79.Ke3 Kg5 80.Be7+ Kh5 81.Kf2 Kg6 82.Kg3 Kf7 83.Bb4 Kg6 84.Kf4 Kh5 
  +/-  (0.78)   Depth: 59/71   00:13:00  25844MN
50.Bd2 a4 51.Bb4 Kh5 52.Kg3 Kg6 53.Kg4 Kh6 54.Bd6 Kg6 55.Bc5 f5+ 56.Kg3 Kf6 57.Kf4 Kg6 58.Bd6 Kf6 59.Ke3 Kg5 60.Kf2 Kg4 61.Kg2 Kg5 62.Kg3 Kg6 63.Kf3 Kg5 64.Be7+ Kh5 65.Kg3 Kg6 66.Kf4 Kf7 67.Ba3 Kf6 68.Bd6 Kg6 69.h3 Kh5 70.Kf3 Kh4 71.Kg2 Kg5 72.Kg3 Kg6 73.Kf3 Kg5 74.Be7+ Kg6 75.Ke3 Kh5 76.Kf2 Kg6 77.Kg3 Kf7 78.Bb4 Kg6 79.Kf4 Kh5 80.Kf3 Kh4 81.Kg2 Kg5 82.Be7+ Kg6 83.Bc5 Kh5 84.Kg3 Kg6 85.Kf4 
  +/-  (0.78)   Depth: 60/71   00:17:06  35182MN
With TBs on it gets to d=95 with the same 0.78 eval. Doesn't bode well for White's winning prospects.
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Marek Soszynski
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Location: Birmingham, England

Re: 7-Piece position

Post by Marek Soszynski »

7-man bases confirm it's a draw.
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