Gonzalez Freixas-Lecroq, corr Mate Postal-Jub25 A 2000

[jdart]

top-level correspondence games are a great source of difficult test moves.

[d] 8/1QB2qbk/6p1/7p/p4P1P/8/1P6/1K6 b - -

Black played .. Qb3!! which seems to be the best. But my program and Rybka want to play .. Qe7 for a long time.

[Howard E]

Thanks for the position.
Tried alot of engines and all like Qe7 also. Inputing Qb3 and playing through some forced moves(most reply Qb6 and after a few checks black captures the h pawn) it does appear to be the best.
Do you have the complete game to post?
I agree, there are many deep and interesting correspondence games.

[Howard E]

Just noticed that if white replys Qb6(to black's Qb3) then most likely Qxb6 was played.

[jdart]

Following is the whole game:

[Event "corr Mate Postal-Jub25 A"]
[Site "AEAC"]
[Date "2000.07.01"]
[Round "?"]
[White "Gonzalez Freixas, Alberto"]
[Black "Lecroq, Michel"]
[Result "0-1"]
[ECO "B76"]
[WhiteElo "2475"]
[BlackElo "2578"]
[PlyCount "90"]
[EventDate "2000.07.01"]
[EventType "tourn (corr)"]
[EventCountry "ESP"]
[Source "ChessBase"]
[SourceDate "2006.01.31"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 O-O 8. Qd2
Nc6 9. O-O-O d5 10. exd5 Nxd5 11. Nxc6 bxc6 12. Bd4 e5 13. Bc5 Be6 14. Ne4 Re8
15. h4 Nf4 16. Qe1 Bd5 17. c4 Qc7 18. Bd6 Qb6 19. cxd5 cxd5 20. g3 dxe4 21.
gxf4 exf4 22. Rh2 Rad8 23. Bxf4 Rxd1+ 24. Kxd1 e3 25. Kc1 Qe6 26. Qb4 Qxa2 27.
Bc4 Rc8 28. Bc7 Qa1+ 29. Kc2 h5 30. Bxf7+ Kh8 31. Bc4 Kh7 32. Qb7 Qa4+ 33. Kb1
Qxc4 34. Qxc8 e2 35. Rxe2 Qxe2 36. Qb7 a5 37. f4 Qe7 38. Ka2 a4 39. Qc6 Qf7+
40. Kb1 Qf6 41. Qb7 Qf5+ 42. Ka2 Qf7+ 43. Kb1 Qb3 44. Qb6 Qxb6 45. Bxb6 Bf6 0-1

[Howard E]

Thanks.

Do any engines find Qxb6?

[d]8/2B3bk/1Q4p1/7p/p4P1P/1q6/1P6/1K6 b - - bm Qxb6;

[jdart]

Qxb6 wins but it looks like other moves are at least as good if not better:

8/2B3bk/1Q4p1/7p/p4P1P/1q6/1P6/1K6 b - - 0 1

Analysis by Rybka 3 32-bit :

1. -+ (-3.08): 1...Kh8 2.Qxb3 axb3 3.Ba5 Kg8 4.Bc3 Bf8 5.Kc1 Kf7 6.Kd2 Be7 7.Ke2 Bxh4 8.Bd2 Bf6 9.Bc1 Ke6 10.Kf3
2. -+ (-3.08): 1...Kh6 2.Qxb3 axb3 3.Bd8 Kh7 4.Kc1 Kg8 5.Ba5 Kf7
3. -+ (-2.96): 1...Kg8 2.Bd8 Qxb6 3.Bxb6 Kf7 4.Ka2 Ke6 5.Bd8 Kf5 6.Bg5 Bf8 7.b3 axb3+ 8.Kxb3 Bd6 9.Kc4 Bxf4 10.Be7 Kg4 11.Kd5 Bg3 12.Ba3 Bxh4 13.Ke6 Bd8
4. -+ (-2.44): 1...Qxb6 2.Bxb6 Bf6 3.Bf2 Kg7

(Dart, 29.11.2009)

[Howard E]

I agree Kg8 gains a tempo as Qxb6 comes next move.

[Eelco de Groot]

Thanks.

Do any engines find Qxb6?

[d]8/2B3bk/1Q4p1/7p/p4P1P/1q6/1P6/1K6 b - - bm Qxb6;

I am decidedly proud of this result It is just the first testposition I tried though, so it is not very well tested version, this build 82.


[d]8/1QB2qbk/6p1/7p/p4P1P/8/1P6/1K6 b - -

Engine: Rainbow Serpent 1.5 Cubic II maxSlope 60 maxValue 750 Build 82 (Athlon 2009 MHz, 256 MB)
by Romstad, Costalba, Kiiski, De Groot

1.00 0:00 +0.44 43...Bd4 (73) 0

2.00 0:00 +0.44 43...Bd4 44.Qe4 (653) 1

2.00 0:00 +1.33 43...Bf6 44.Kc1 Bxh4 (6.404) 15

3.00 0:00 +1.01 43...Bf6 44.Qc6 Bxh4 45.Be5 g5
46.Qe4+ Kh6 47.fxg5+ Bxg5 48.Bd6 Qg6 (171.498) 261

4.01 0:02 +1.01 43...Bf6 44.Qc6 Bxh4 45.Be5 g5
46.Qe4+ Kh6 47.fxg5+ Bxg5 48.Bd6 Qg6 (1.056.603) 524

4.02 0:03 +1.21 43...Qe7 44.Ka2 Kh6 45.Qc6 Qxh4
46.Qxa4 Qe7 47.Qc6 h4 (1.838.435) 571

5.01 0:03 +1.25 43...Qe7 44.Ka2 Kh6 45.Qc6 Qxh4
46.Qxa4 Qe7 47.Qc6 h4 48.Kb1 Bf6 (2.313.099) 601

5.03 0:18 +1.29 43...Qd7 44.Kc2 Bf6 45.Qb6 Bxh4
46.Be5 Be7 47.b4 axb3+ 48.Qxb3 Qc6+
49.Kd1 Qh1+ 50.Ke2 Qh2+ 51.Ke1 Bc5 (12.157.716) 656

6.01 0:18 +1.37 43...Qd7 44.Kc2 Bf6 45.Qb6 Bxh4
46.Be5 Be7 47.Qb8 Qc6+ 48.Kb1 Qh1+
49.Kc2 Qe4+ 50.Kc3 Qc6+ 51.Kd3 Qd5+
52.Bd4 Qb3+ 53.Qxb3 axb3 54.Ke3 h4
55.Ke4 Kh6 (12.409.284) 657

7.01 0:50 +1.61++ 43...Qd7 44.Kc2 Bf6 45.Qb6 Bxh4
46.Kb1 Be7 (33.910.814) 669

8.01 0:56 +1.73 43...Qd7 44.Kc2 Bf6 45.Qb8 Qc6+
46.Kb1 Bxh4 47.Be5 Bf6 48.Qa7+ Kh6
49.Qd4 Bxe5 50.Qxe5 Kh7 51.Ka2 Qd7
52.Qe4 h4 53.b4 (38.174.664) 673

8.02 4:26 +1.89 43...Qe7 44.Kc2 Bf6 45.Qb8 Qe4+
46.Kc1 Qe1+ 47.Kc2 Qf2+ 48.Kb1 Qxh4
49.Be5 Bxe5 50.Qxe5 Qd8 51.Kc2 h4
52.Qe4 Qd7 53.Kc1 Kh6 (179.847.630) 675

9.01 4:49 +2.02 43...Qe7 44.Ka2 Kh6 45.Qc6 Qxh4
46.Qxa4 Qe7 47.Qc4 h4 48.f5 gxf5
49.b4 h3 50.b5 Be5 51.Bxe5 Qxe5
52.Qh4+ Kg6 53.Qxh3 Qxb5 54.Qf3 Kf6
55.Ka3 (195.937.348) 677

10.01 5:00 +1.93 43...Qe7 44.Ka2 Kh6 45.Qc6 Qxh4
46.Qxa4 Qe7 47.Qc4 h4 48.f5 gxf5
49.b4 Qe4 50.Kb3 h3 51.b5 Bd4 52.Qf1 Qe3+
53.Kc4 Kg5 (205.018.652) 681

11.01 5:41 +1.85 43...Qe7 44.Ka2 Kh6 45.Qc6 Qxh4
46.Qxa4 Qe7 47.Qc4 h4 48.f5 gxf5
49.b4 Qe4 50.Kb3 h3 51.b5 Bd4 52.Qf1 Qe3+
53.Kc4 Kg5 54.Bd8+ Kg6 (235.836.765) 690

11.04 13:15 +2.22++ 43...Qb3 44.Qxb3 axb3 45.Be5 Kg8
46.Kc1 Bxe5 47.fxe5 Kf7 48.Kd2 Ke6
49.Kd3 Kxe5 50.Ke3 Kf5 51.Kf3 g5 (557.390.032) 700

12.01 13:54 +2.10 43...Qb3 44.Qb6 { }Qd3+ 45.Ka2 Qd5+
46.Kb1 Qh1+ 47.Ka2 Qxh4 48.Be5 Qe7
49.Qd4 h4 50.Qxa4 Qe6+ 51.Ka3 Bf8+
52.b4 h3 53.Qa8 Qe7 54.Bc3 h2 55.Qh1 Qa7+
56.Kb3 Qf7+ (586.354.536) 702

13.01 28:42 +2.38 43...Qb3 44.Qb6 Qd3+ 45.Ka2 Qd5+
46.Kb1 Qh1+ 47.Ka2 Qxh4 48.Qc5 Qf6
49.Be5 Qe6+ 50.Ka1 Qd7 51.Bxg7 Kxg7
52.Qc3+ Kh7 53.Qe1 Kg8 54.Qh4 Kf7
55.Kb1 Qd1+ 56.Ka2 Ke6 (1.219.462.938) 708

14.01 55:50 +2.38 43...Qb3 44.Qb6 Qd3+ 45.Ka2 Qd5+
46.Kb1 Qh1+ 47.Ka2 Qxh4 48.Qc5 Qf6
49.Be5 Qe6+ 50.Ka1 Qd7 51.Bxg7 Kxg7
52.Qc3+ Kh7 53.Qe1 Kg8 54.Qh4 Kf7
55.Kb1 Qd1+ 56.Ka2 Ke6 (2.427.460.350) 724

15.01 136:06 +2.38 43...Qb3 44.Qb6 Qd3+ 45.Ka2 Qd5+
46.Kb1 Qh1+ 47.Ka2 Qxh4 48.Qc5 Qf6
49.Be5 Qe6+ 50.Ka1 Qd7 51.Bxg7 Kxg7
52.Qc3+ Kh7 53.Qe1 Kg8 54.Qh4 Kf7
55.Kb1 Qd1+ 56.Ka2 Ke6 (5.859.346.580) 717

Anyone can soon get this result too, with the Super Stockfish Server from Marco, Joona and Tord, which is for rent for just 1125 $ per year full round the clock access . The EC commisionair for fair practices has decided that we should stop offering chess engines for dump prices so to avoid a trade war, or million dollar fines, we have no choice but to follow Rybka. But at least you get 44. Qb6

[tano-urayoan]

I agree Kg8 gains a tempo as Qxb6 comes next move.

Not necessarily Kg8 white could take in b3 and play Bd8

[Dr.Wael Deeb]

Thanks.

Anyone can soon get this result too, with the Super Stockfish Server from Marco, Joona and Tord, which is for rent for just 1125 $ per year full round the clock access . The EC commisionair for fair practices has decided that we should stop offering chess engines for dump prices so to avoid a trade war, or million dollar fines, we have no choice but to follow Rybka. But at least you get 44. Qb6

Hmmm,a very good price I admit....
Can we pay the rent per year divided into several credits or we have to pay it at once
Thanks for leting us have this great opportunity of renting this great chess engine online