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Subject: Re: Hard position for programs

Author: Ernst Walet

Date: 12:35:42 04/15/04

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On April 15, 2004 at 10:04:27, Mihaly Szalai wrote:

>[Event "Pucarevo (zt)"]
>[Site "?"]
>[Date "1987.??.??"]
>[Round "?"]
>[White "Marjanovic, S."]
>[Black "Yilmaz, T."]
>[Result "1-0"]
>[ECO "C84"]
>[WhiteElo "2505"]
>[BlackElo "2375"]
>[PlyCount "67"]
>[EventDate "1987.??.??"]
>
>{43/425} 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. d4 exd4 6. O-O Be7 7. e5
>Ne4 8. Nxd4 Nxd4 9. Qxd4 Nc5 10. Nc3 Nxa4 {N} (10... O-O) 11. Qxa4 (11. Nxa4)
>11... O-O 12. Bf4 $1 (12. Be3 d5 $11) 12... b5 (12... f6 $2 13. Qc4+ {>< c7}) (
>12... d5 13. exd6 Bxd6 14. Rad1 Bd7 15. Qd4 Bxf4 16. Qxf4) 13. Qd4 Bb7 14. Rad1
>Bc6 15. Nd5 $14 {|^} Re8 16. Rd3 Bf8 (16... d6 17. exd6 (17. Nxc7 $16) 17...
>Bxd6 (17... cxd6 18. Rg3 f6 19. Bh6 g6 20. Re1 $16 {->}) 18. Rg3 Bf8 19. Bh6 $1
>$16 {->}) (16... Bxd5 17. Qxd5 d6 18. exd6 Bxd6 19. Bxd6 cxd6 20. Qxd6 $16) 17.
>Bg3 Qc8 $2 {/\ 18...Bd5 19.Qd5 d6} (17... d6 18. Nb4 (18. Bh4 dxe5 19. Qg4 Qxd5
>$1 20. Rxd5 Bxd5 $44) 18... Bxg2 19. Kxg2 c5 20. Qd5 cxb4 21. exd6 $16) 18.
>Nf6+ $1 gxf6 19. Bh4 Re6 (19... Be7 20. Qf4 $1 Qd8 21. exf6 Bf8 22. Rg3+ Kh8
>23. Qg5 $1 Bh6 24. Qxh6 Rg8 25. Rg7 Be4 26. f4 $18) 20. Rg3+ Kh8 21. Qg4 Bh6
>22. Qxe6 $3 fxe6 23. Bxf6+ Bg7 24. Rxg7 h5 (24... h6 25. Rd1 Qf8 $1 26. Rgxd7+
>Kg8 27. Rxc7 Be4 (27... Qc5 28. Rd3 Qxc2 29. Rg3+ Kf8 30. h3 $18) 28. Rdd7 $18)
>25. Rd1 Qf8 $1 26. Rg5+ $1 Kh7 27. Rxh5+ Kg6 28. Rg5+ Kf7 (28... Kh6 {/\ Qf6}
>29. Rg4 $1 Kh5 30. Rdd4 $18) 29. Rd4 Qh6 30. Rf4 $1 Qh7 31. Rfg4 Kf8 32. Rg7
>Qh8 33. Be7+ Ke8 34. Bb4 1-0
>
>Position after 17... Qc8:
>[D]r1q1rbk1/2pp1ppp/p1b5/1p1NP3/3Q4/3R2B1/PPP2PPP/5RK1 w - - 0 18
>
>18. Nf6+!
>
>Tactical minded people make this move much easier than chess programs. The white
>forces are promising ("this sac must be good"), however there is no mate attack
>and the brilliant queen sac four moves later would deserve another diagram.
>
>You should show it to your favourite engine. (I don't expect a long thread
>though.)
>
>Thanks
>Mihaly


It takes a while, but Hiarcs9 finds it eventually.

New game,
r1q1rbk1/2pp1ppp/p1b5/1p1NP3/3Q4/3R2B1/PPP2PPP/5RK1 w - - 0 1

Analysis by Hiarcs 9:

1.e6 Bxd5 2.Qxd5 dxe6
  µ  (-0.82)   Depth: 1/5   00:00:00
1.f3
  ²  (0.61)   Depth: 1/5   00:00:00
1.f3
  ²  (0.61)   Depth: 1/5   00:00:00
1.f3 a5
  ²  (0.59)   Depth: 2/5   00:00:00
1.f3 a5 2.Rfd1
  ²  (0.70)   Depth: 3/7   00:00:00
1.f3 a5 2.Rfd1 Bb7
  ±  (0.74)   Depth: 4/10   00:00:00
1.f3 a5 2.Rfd1 Bb7 3.Bf4
  ±  (0.71)   Depth: 5/11   00:00:00  3kN
1.f3 b4 2.Rfd1 Bb5 3.R3d2 a5
  ²  (0.70)   Depth: 6/16   00:00:00  25kN
1.Rfd1 a5
  ±  (0.71)   Depth: 6/16   00:00:00  31kN
1.Rfd1 Qb7 2.Bf4 a5
  ±  (0.75)   Depth: 6/16   00:00:00  38kN
1.Rfd1 a5 2.f3 Re6 3.a3 Bb7 4.Nf4 Re8
  ±  (0.73)   Depth: 7/18   00:00:00  98kN
1.Rfd1 Qb7 2.Bf4 b4 3.Qe4 Bc5
  ²  (0.70)   Depth: 8/21   00:00:01  345kN
1.Rfd1 Qb7 2.Qg4 Bxd5 3.Rxd5 d6 4.Qd7 Qc8 5.Qc6
  ±  (0.73)   Depth: 9/26   00:00:04  1013kN
1.Rfd1 Bxd5 2.Qxd5 d6 3.exd6 Bxd6 4.Bxd6 cxd6 5.c3
  ²  (0.66)   Depth: 10/29   00:00:10  2671kN
1.Rfd1 Qb7 2.h3 d6 3.exd6 cxd6 4.Qg4 Re6
  ²  (0.63)   Depth: 11/35   00:01:01  15247kN
1.Rfd1 Qb7 2.c3 d6 3.exd6 cxd6
  ²  (0.63)   Depth: 12/37   00:02:26  36784kN
1.Rfd1 Qb7 2.a3 d6 3.exd6 cxd6
  ²  (0.55)   Depth: 13/37   00:05:24  82501kN
1.Rfd1 Qb7 2.h3 d6 3.exd6 cxd6 4.Bf4 Re6
  ²  (0.49)   Depth: 14/40   00:21:00  314529kN
1.Nf6+ gxf6
  ²  (0.50)   Depth: 14/44   00:42:19  643501kN
1.Nf6+ gxf6
  ±  (0.80)   Depth: 14/44   00:48:47  747972kN
1.Nf6+ gxf6 2.Bh4 Re6 3.Qg4+ Kh8 4.Rg3 Bh6 5.Qxe6 fxe6 6.Bxf6+ Bg7 7.Rxg7 h5
8.Rd1 Qf8 9.Rf7+ Kg8 10.Rxf8+ Rxf8 11.Rd3 a5
  ±  (1.12)   Depth: 14/44   00:54:14  835662kN

(AthlonXP @ 2200MHz, 512MB hash, 15.04.2004)


Ernst.



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