Is this pawnending a draw?

[Thomas Lagershausen]

[fen]8/pp1k4/2p4p/2p5/2P5/6P1/P3PP2/6K1 w - - 0 34 [/fen]

Game was played by me against an old computer today.

[kasinp]

I don't think so, the following is SF15 with 7-men tb after 1 minute on 8 cores:

New game
8/pp1k4/2p4p/2p5/2P5/6P1/P3PP2/6K1 w - - 0 1

Analysis by Stockfish 15:

1. +- (6.75): 34.a4 h5 35.Kf1 Ke6 36.e3 Kf5 37.f3 b6 38.Ke2 Kg6 39.e4 Kf7 40.f4 Kg7 41.Kf2 Kf6 42.Ke3 Kf7 43.Kf3 Kf8 44.e5 a6 45.a5 b5 46.Ke4 Kf7 47.f5 b4 48.e6+ Kf6 49.Kd3 Ke7 50.Ke3 Kf6 51.Ke4 Ke7 52.Ke5 Kf8 53.Kd6
2. = (0.00): 34.Kf1 b5 35.Ke1 b4 36.Kd2 a5 37.a4 h5 38.Kc1 Ke7 39.e3 Kf7 40.e4 Kf6 41.f4 Kf7 42.Kd1 Ke8 43.e5 Kf7 44.f5 Kf8 45.Kc1 Ke7 46.Kc2 Kf7 47.e6+ Ke7 48.Kd3 Kf6 49.Ke4 Ke7
3. = (0.00): 34.g4 b5 35.Kf1 a5 36.Ke1 a4 37.Kd2 b4 38.Kc1 Ke7 39.f4 a3 40.e3 Kf7 41.e4 Kg7 42.e5 Kf8 43.e6 Ke8 44.Kb1 Ke7 45.f5 Kf6 46.Kc1 Ke7

[Eelco de Groot]

Without tablebases, Blue Marlin 14.9a after 1. a4 only saw a high score but a draw. But that does not say much. For instance this seemed a draw only

[pgn]
[Event "?"]
[Site "?"]
[Date "2022.05.06"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "8/pp1k4/2p4p/2p5/2P5/6P1/P3PP2/6K1 w - -"]

1. a4 a6 2. Kf1 b5 3. Ke1 h5 4. e4 Ke8 5. Ke2 Kd8 6. Kd3
Kc8 7. e5 Kb8 8. f4 Kc7 9. Ke4 b4 10. a5 Kd7 11. f5 *
[/pgn]

[fen]8/3k4/p1p5/P1p1PP1p/1pP1K3/6P1/8/8 b - -[/fen]


61 61:31 +4.74 11...Ke8 12.e6 Ke7 13.Ke5 b3 14.f6+ Ke8 15.Kd6 b2 16.f7+ Kf8 17.Kd7 b1D 18.e7+ Kxf7 19.e8D+ Kf6 20.Kxc6 Db4 21.Df8+ Kg5 22.Df4+ Kg6 23.De4+ Kf6 24.Dh4+ Kg6 (8.201.635.499) 2221
61 61:31 +4.74 11...Ke7 12.e6 Kf6 13.Ke3 Ke7 14.Kd3 Kd6 15.Ke4 Ke7 16.Ke5 b3 17.f6+ Ke8 18.Kd6 b2 19.f7+ Kf8 20.Kd7 b1D 21.e7+ Kxf7 22.e8D+ Kf6 23.Kxc6 Db4 24.Df8+ Kg5 (8.201.635.499) 2221
60 61:31 +M25 11...Kd8 12.f6 Ke8 13.e6 Kf8 14.Ke3 Kg8 15.e7 Kf7 16.Ke4 Ke8 17.Ke5 Kd7 18.Kf5 b3 19.Kg6 b2 20.Kf7 Kc7 21.e8D b1D 22.De5+ Kd7 23.Kg7 Dd1 24.De7+ Kc8 (8.201.635.499) 2221
60 61:31 +M23 11...Kc8 12.f6 Kd7 13.f7 Ke7 14.e6 Kf8 15.Kf5 Kg7 16.Ke5 b3 17.Kd6 b2 18.Ke7 Kh7 19.f8D b1D 20.Df7+ Kh6 21.Df6+ Dg6 22.Dxg6+ Kxg6 23.Kd6 Kf5 24.e7 Ke4 (8.201.635.499) 2221

[Graham Banks]

[fen]8/pp1k4/2p4p/2p5/2P5/6P1/P3PP2/6K1 w - - 0 34 [/fen]

Game was played by me against an old computer today.

My first impression is a draw, since black can create a passed pawn on the queenside, that will prevent white from winning on the kingside.

[Ras]

My first impression is a draw, since black can create a passed pawn on the queenside

That's correct, but while both sides will make a queen, White can move the king so that it is close to the remaining black a-pawn and then get a second queen from the white a-pawn.

[Thomas Lagershausen]

Right.To win this game white has to transpose it in a queenendgame.

At this day far over my horizon.

Here is the complete game:

[pgn][Event "Computer Schach Partie"]
[Site "30 Züge in 60 Minuten"]
[Date "2022.05.05"]
[Round "10"]
[White "Lagershausen"]
[Black "SciSys Mark V 64 Mhz"]
[Result "1-0"]
[ECO "A25"]
[Opening "Englisch"]
[Time "14:46:02"]
[Variation "Geschlossen, 3.g3 d6 4.Bg2"]
[TimeControl "3600"]
[Termination "normal"]
[PlyCount "97"]
[WhiteType "human"]
[BlackType "human"]

1. c4 e5 2. Nc3 d6 3. g3 Nc6 4. Bg2 Bd7 5. Nf3 Qc8 6. O-O g6 7. d4 Bg7 8.
Be3 f5 9. dxe5 Nxe5 10. c5 Nc4 11. Bd4 Nf6 12. b3 dxc5 13. Bxf6 Bxf6 14.
Nd5 Bg7 15. bxc4 c6 16. Nf4 Bxa1 17. Qxa1 O-O 18. Ng5 Qe8 19. Rd1 Qe7 20.
h4 Rad8 21. Nd5 Qg7 22. Qxg7+ Kxg7 23. Nf4 Kh8 24. h5 gxh5 25. Bf3 Kg8 26.
Bxh5 h6 27. Nf7 Rxf7 28. Ne6 Rff8 29. Nxd8 Rxd8 30. Bg6 Kf8 31. Bxf5 Ke8
32. Rxd7 Rxd7 33. Bxd7+ Kxd7 34. f4 b5 35. g4 bxc4 36. Kf2 Kd6 37. e4 c3
38. Ke2 c4 39. Kd1 Kc5 40. Kc2 Kd4 41. e5 Kd5 42. Kxc3 a6 43. a3 c5 44. a4
a5 45. Kd2 Ke6 46. Kc2 c3 47. Kxc3 Kd5 48. Kd3 Kc6 49. Kc4 1-0
[/pgn]

[Ignacio]

[fen]8/pp1k4/2p4p/2p5/2P5/6P1/P3PP2/6K1 w - - 0 34 [/fen]

Game was played by me against an old computer today.

White wins.
With Komodo 10.2, I have get +250.00.
Best.

Ignacio

[Paloma]

Why without line?

[peter]

[fen]8/pp1k4/2p4p/2p5/2P5/6P1/P3PP2/6K1 w - - 0 34 [/fen]

Hello Thomas!

That's won for White, even if the Queen- ending after conversion for both sides takes its time.

After some Forward- Backward:

8/pp1k4/2p4p/2p5/2P5/6P1/P3PP2/6K1 w - - 0 1

Analysis by Stockfish 030522:

34.a4 Kc7 35.f4 h5 36.Kf1 Kc8 37.e4 Kd8 38.Ke2 Ke7 39.Kd2 b6 40.Ke2 Kd6 41.e5+ Ke6 42.Ke3 Kf5 43.Kd3 a6 44.Ke3 b5 45.Kd3 Kg6 46.a5 Kf5 47.Kc3 Ke6 48.Kb2 b4 49.Kc1 Kf5 50.Kc2 Ke6 51.Kd2 Kf5 52.Ke3 b3 53.Kd2 Ke6 54.Kc1 b2+ 55.Kxb2 Kf5 56.Kc3 Ke4 57.e6 Ke3 58.e7 Kf3 59.f5 Kf2 60.e8D h4 61.gxh4
+- (19.86) Tiefe: 53/70 00:07:16 40230MN, tb=39253199

Then I did let komodo play out against SF dev., each had 15 threads of a 16x3.5GHz CPU, 8G hash, 6men Syzygys, 45'+15":
[pgn][Event "AMD, Schnellschach 45m+15s"]
[Site "da"]
[Date "2022.05.06"]
[Round "1"]
[White "Dragon 3 by Komodo Chess 64-b"]
[Black "Stockfish 030522"]
[Result "1-0"]
[FEN "8/pp1k4/2p4p/2p5/2P5/6P1/P3PP2/6K1 w - - 0 34"]
[SetUp "1"]
[Annotator "3.54;8.73"]
[TimeControl "2700+15"]

{AMD Ryzen 9 5950X 16-Core Processor 3400 MHz W=33.3 plies; 53 327kN/s; 557 707 709 TBAs B=56.7 plies; 37 874kN/s; -1 260 017 011 TBAs} 34.a4 {3.54/30 91 Beide letzter Buchzug} 34...a6 {8.73/48 146} 35.Kf1 {5.18/27 342} 35...b5 {15.07/44 0} 36.Ke1 {5.37/25 292 (a5)} 36...h5 {18.41/47 319} 37.e4 {5.77/24 0} 37...Ke8 {27.84/59 324 (Ke6)} 38.Kd2 {7.35/28 195 (f4)} 38...Ke7 {152.16/61 323 (Kf7)} 39.a5 {7.35/33 63 (f4)} 39...Ke6 {152.21/57 277 (Kf7)} 40.Kd3 {7.35/36 88 (f4)} 40...Kd6 {152.16/53 38 (Kf7)} 41.f4 {7.52/43 428 (Ke3)} 41...Ke6 {152.25/56 67} 42.Ke3 {8.58/43 146} 42...Kf6 {152.27/57 0} 43.e5+ {9.00/41 42} 43...Kf5 {152.30/57 325} 44.Kd3 {9.07/49 0 (Kf3)} 44...Ke6 {152.30/52 49} 45.Ke4 {9.63/34 25 (Ke3)} 45...b4 {152.29/43 97 (Ke7)} 46.f5+ {9.70/37 61} 46...Ke7 {152.38/55 90 (Kf7)} 47.Ke3 {9.91/44 43 (e6)} 47...Kf7 {152.39/41 209 (Kd7)} 48.e6+ {10.25/38 199} 48...Ke7 {152.41/60 124} 49.Kd3 {10.29/35 52} 49...Kf6 {152.42/62 242 (Kd6)} 50.Ke4 {10.42/27 32} 50...Ke7 {152.43/ 63 14} 51.Ke5 {10.45/33 80} 51...b3 {152.44/62 87} 52.f6+ {10.44/28 79} 52...Ke8 {152.44/43 75} 53.Kd6 {10.49/29 0} 53...b2 {152.46/61 28} 54.f7+ {10.58/30 31} 54...Kf8 {152.47/58 5} 55.e7+ {10.60/24 31} 55...Kxf7 {152.48/61 0} 56.Kd7 {10.70/30 162} 56...b1=Q {152.48/59 0} 57.e8=Q+ {10.77/30 133} 57...Kf6 {152.50/54 0 (Kg7)} 58.Qxh5 {10.78/26 123} 58...Qb4 {152.51/57 0 (Db7+)} 59.Qh6+ {10.89/24 106} 59...Kf7 {152.53/54 95 (Kf5)} 60.Qe6+ {11.34/20 21 (Df4+)} 60...Kf8 {152.54/56 23 (Kg7)} 61.Kxc6 {11.69/21 145 (Df6+)} 61...Qxa5 {152.55/64 30 (Da4+)} 62.Qf5+ {250.00/20 14 (Df6+)} 62...Kg7 {152.56/52 34} 63.Qxc5 {250.00/25 0 (Dg5+)} 63...Qa4+ {152.57/62 20} 64.Kb6 {250.00/27 0} 64...a5 {152.58/58 42} 65.g4 {250.00/22 0 (Dg5+)} 65...Kg6 {152.59/54 78 (Kf6)} 66.Ka6 {250.00/23 2 (Dh5+)} 66...Qa2 {152.59/47 6} 67.Qd5 {250.00/24 0 (Df5+)} 67...a4 {152.60/56 7 (Kf6)} 68.Ka5 {250.00/28 88} 68...a3 {152.61/55 0} 69.Ka4 {250.00/39 2 (Dd3+)} 69...Kg7 {152.62/55 54 (Kf6)} 70.Qd3 {250.00/42 7} 70...Kf7 {152.62/65 0} 71.c5 {250.00/48 2} 71...Qg2 {152.63/52 4 (De6)} 72.Qf5+ {250.00/66 91 (Dd7+)} 72...Ke7 {152.64/62 6} 73.Kxa3 {250.00/68 74} 1-0[/pgn]

[Thomas Lagershausen]

Hi Peter

As always you indicate the correct method for optimal learning of the position.

Now everything is clear and my understanding of this endgame can grow.

Thx for this.

All the best

Thomas