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Old September 7th 07, 11:24 AM posted to rec.games.chess.analysis
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Default Rook and Pawn vs Queen in endgame.

I played the following game on ICC - not a particularly good game, as
there were lots of unforced errors. But the ending is interesting. Is
this winnable by White (which I was) or is it a draw? (In essence, I had
a queen and my opponent a pawn and rook.)

I know the 5-piece endgame tablebases would have this, but I don't have
them on this computer. But I was more interested in the generaliites
than in this particular game.

[Event "ICC 45 5"]
[Site "Internet Chess Club"]
[Date "2007.09.06"]
[Round "-"]
[White "g8wrb"]
[Black "papajack"]
[Result "1/2-1/2"]
[ICCResult "Game drawn by mutual agreement"]
[WhiteElo "1582"]
[BlackElo "1509"]
[Opening "Sicilian: Smith-Morra gambit"]
[ECO "B21"]
[NIC "SI.48"]
[Time "17:59:34"]
[TimeControl "2700+5"]

1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Nf3 d6 6. Bc4 e6 7. O-O Be7 8.
Qe2 Nf6 9. Rd1 O-O 10. e5 Ne8 11. Nb5 d5 12. Be3 a6 13. Na3 Qc7 14. Bb3 Nxe5
15. Rac1 Nc6 16. Bc2 Nf6 17. Ng5 Qe5 18. Nf3 Qxb2 19. Bxh7+ Nxh7 20. Qxb2
Bf6 21. Bd4 e5 22. Bxe5 Nxe5 23. Nxe5 b5 24. Rxd5 Bb7 25. Rdc5 Rfe8 26. Re1
Ng5 27. Qd2 Rad8 28. Qf4 Ne6 29. Qb4 Nxc5 30. Qxc5 Rd5 31. Qc7 Rdxe5 32.
Rxe5 Rxe5 33. Kf1 Bd5 34. Qc8+ Kh7 35. Nb1 Bxa2 36. Qc2+ g6 37. Qxa2 Re6 38.
h3 Kg7 39. g4 b4 40. Nd2 Bc3 41. Nb3 Re1+ 42. Kg2 Re6 43. Nc5 Rb6 44. Nxa6
b3 45. Qa3 Bf6 46. Qa5 Bd4 47. Nc5 Rb8 48. Nxb3 Rxb3 49. f3 Rb2+ 50. Kf1 Rh2
51. Qd5 Bb2 52. Qb7 Be5 53. Qe7 Bb2 54. h4 Bf6 55. Qe4 Rxh4 56. Kg2 Bb2 57.
Kg3 Rh8 58. f4 Rc8 59. f5 Rc3+ 60. Kh4 Rc1 61. fxg6 Bf6+ 62. g5 Bxg5+ 63.
Kxg5 Rg1+ 64. Kh5 fxg6+ 65. Kh4 g5+ 66. Kh3 Rf1 67. Qe7+ Kg6 68. Kg2 Rf4 69.
Kg3 Kf5 70. Qh7+ Kf6 71. Qh5 Rh4 72. Qf3+ Rf4 73. Qd5 Kg6 74. Qg8+ Kf5
{Game drawn by mutual agreement}
1/2-1/2

--
Dave (from the UK)

Please note my email address changes periodically to avoid spam.
It is always of the form:
Hitting reply will work for a few months only - later set it manually.

http://chessdb.sourceforge.net/ - a Free open-source Chess Database
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Old September 7th 07, 12:52 PM posted to rec.games.chess.analysis
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First recorded activity by ChessBanter: Apr 2005
Posts: 2,598
Default Rook and Pawn vs Queen in endgame.

Dave (from the UK) wrote:
I know the 5-piece endgame tablebases would have this, but I don't
have them on this computer.


http://www.lokasoft.nl/tbweb.htm

But I was more interested in the generaliites than in this
particular game.


Probably wise -- that game isn't the best. :-) It looks like a tricky
ending and is some way beyond my ken; the fact that your king is close
to his pawn is probably in your favour.


[Event "ICC 45 5"]
[Site "Internet Chess Club"]
[Date "2007.09.06"]
[Round "-"]
[White "g8wrb"]
[Black "papajack"]
[Result "1/2-1/2"]

1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3 Nc6 5.Nf3 d6 6.Bc4 e6 7.O-O Be7
8. Qe2 Nf6 9.Rd1 O-O 10.e5 Ne8 11.Nb5 d5 12.Be3 a6 13.Na3 Qc7 14.Bb3
Nxe5 15.Rac1 Nc6 16.Bc2 Nf6 17.Ng5 Qe5 18.Nf3 Qxb2 19.Bxh7+ Nxh7
20.Qxb2 Bf6 21.Bd4 e5 22.Bxe5 Nxe5 23.Nxe5 b5 24.Rxd5 Bb7 25.Rdc5
Rfe8 26.Re1 Ng5 27.Qd2 Rad8 28.Qf4 Ne6 29.Qb4 Nxc5 30.Qxc5 Rd5
31.Qc7 Rdxe5 32. Rxe5 Rxe5 33.Kf1 Bd5 34.Qc8+ Kh7 35.Nb1 Bxa2
36.Qc2+ g6 37.Qxa2 Re6 38.h3 Kg7 39.g4 b4 40.Nd2 Bc3 41.Nb3 Re1+
42.Kg2 Re6 43.Nc5 Rb6 44.Nxa6 b3 45.Qa3 Bf6 46.Qa5 Bd4 47.Nc5 Rb8
48.Nxb3 Rxb3 49.f3 Rb2+ 50.Kf1 Rh2 51.Qd5 Bb2 52.Qb7 Be5 53.Qe7 Bb2
54.h4 Bf6 55.Qe4 Rxh4 56.Kg2 Bb2 57. Kg3 Rh8 58.f4 Rc8 59.f5 Rc3+
60.Kh4 Rc1 61.fxg6 Bf6+ 62.g5 Bxg5+ 63. Kxg5 Rg1+ 64.Kh5 fxg6+


White mates in 56.

65.Kh4 g5+?!


White mates in 15.

66.Kh3?!


White mates in 30. You need to stay close to the pawn because it's
tying up the black rook and can't be protected by the king at the
moment (66... Kf6?? 67.Qd4+ 1-0). This kind of endgame needs to be
played slowly and carefully because, superficially, all the moves look
equally pointless. :-)

66... Rf1 67.Qe7+ Kg6 68.Kg2?


Draw.

Rf4 69. Kg3 Kf5?


White mates in 33.

70.Qh7+?


Draw

Kf6 71.Qh5 Rh4 72.Qf3+ Rf4 73.Qd5 Kg6 74.Qg8+ Kf5?


White mates in 33.

{Game drawn by mutual agreement} 1/2-1/2



Dave.

--
David Richerby Lead Clock (TM): it's like a clock
www.chiark.greenend.org.uk/~davidr/ that weighs a ton!
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Old September 8th 07, 12:29 PM posted to rec.games.chess.analysis
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First recorded activity by ChessBanter: Aug 2007
Posts: 33
Default Rook and Pawn vs Queen in endgame.

David Richerby wrote:
Dave (from the UK) wrote:

I know the 5-piece endgame tablebases would have this, but I don't
have them on this computer.



http://www.lokasoft.nl/tbweb.htm



Thank you, I should have thought of that!

But I was more interested in the generaliites than in this
particular game.



Probably wise -- that game isn't the best. :-)



Not too impressive. I think a couple of 1200 players could have done as
well.

It looks like a tricky
ending and is some way beyond my ken; the fact that your king is close
to his pawn is probably in your favour.





66.Kh3?!



White mates in 30. You need to stay close to the pawn because it's
tying up the black rook and can't be protected by the king at the
moment (66... Kf6?? 67.Qd4+ 1-0).


Yes, I should have seen that.

This kind of endgame needs to be
played slowly and carefully because, superficially, all the moves look
equally pointless. :-)


Yes, after initially thinking I had an easy position, with a queen
generally far superior to a rook + pawn, I soon realised that it was far
from trivial.


66... Rf1 67.Qe7+ Kg6 68.Kg2?



Draw.


Rf4 69. Kg3 Kf5?



White mates in 33.


70.Qh7+?



Draw


Kf6 71.Qh5 Rh4 72.Qf3+ Rf4 73.Qd5 Kg6 74.Qg8+ Kf5?



White mates in 33.


{Game drawn by mutual agreement} 1/2-1/2


If you fancy a challenge, see if you can beat a strong engine with it.


--
Dave (from the UK)

Please note my email address changes periodically to avoid spam.
It is always of the form:
Hitting reply will work for a few months only - later set it manually.

http://chessdb.sourceforge.net/ - a Free open-source Chess Database
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