Test Position: Georgiev vs Ionescu, UAE 1986 21.Bxh7!

[acase]

This position seems to be tough for the engines I have. Deep Junior 2010 seems to find it quickly after about 25 seconds on my quad, but Junior's evaluation of only 0.62 suggests that it doesn't know why 21.Bxh7 is the best move here. If your engine finds the solution it should show at least an eval of 3+.

Also notable about this position is the position of the black pieces.
The Queen and King are on either side of the Rooks and Bishops all lined up on the back rank with the Knights on top of them in the middle.



[d]1qrrbbk1/1p1nnppp/p3p3/4P3/2P5/1PN1N3/PB2Q1PP/1B2RR1K w - - 0 21


[Event "Dubai ol (Men)"]
[Site "Dubai"]
[Date "1986.11.29"]
[Round "13"]
[White "Georgiev, Krum"]
[Black "Ionescu, Constantin"]
[Result "1-0"]
[ECO "B50"]
[WhiteElo "2465"]
[BlackElo "2495"]
[PlyCount "105"]
[EventDate "1986.11.??"]
[EventType "team"]
[EventRounds "14"]
[EventCountry "UAE"]
[Source "ChessBase"]
[SourceDate "1994.03.01"]
[WhiteTeam "Bulgaria"]
[BlackTeam "Romania"]
[WhiteTeamCountry "BUL"]
[BlackTeamCountry "ROM"]

1. e4 c5 2. Nf3 e6 3. b3 Nc6 4. Bb2 d6 5. d4 cxd4 6. Nxd4 a6 7. Be2 Bd7 8. c4
Nf6 9. Nc3 Be7 10. O-O O-O 11. Nc2 Rc8 12. f4 Qb6+ 13. Kh1 Rfd8 14. Bd3 Be8 15.
Qe2 Qc7 16. Rae1 Bf8 17. Ne3 Ne7 18. Bb1 Qb8 19. e5 dxe5 20. fxe5 Nd7 21. Bxh7+
Kxh7 22. Ne4 Kg8 23. Ng5 g6 24. Ng4 Nf5 25. Rxf5 exf5 26. Qf2 Be7 27. Nf6+ Nxf6
28. exf6 Bxf6 29. Qh4 Rd1 30. Qh7+ Kf8 31. Ba3+ Rd6 32. Bxd6+ Qxd6 33. Rxe8+
Kxe8 34. Qxf7+ Kd8 35. Ne6+ Qxe6 36. Qxe6 Rc6 37. Qg8+ Kc7 38. Qxg6 Rd6 39. g3
Rd1+ 40. Kg2 Rd2+ 41. Kh3 Be7 42. a4 Rf2 43. Qf7 Kd7 44. Qd5+ Kc7 45. c5 Bd8
46. b4 Kc8 47. b5 axb5 48. axb5 Bc7 49. Qe6+ Kd8 50. c6 bxc6 51. bxc6 Rd2 52.
Qg8+ Ke7 53. Qg5+ 1-0

[GARGAMEL]

Hello

there is the second solution

Georgiev,K - Ionescu,C, Dubai ol (Men), Lxh7
1qrrbbk1/1p1nnppp/p3p3/4P3/2P5/1PN1N3/PB2Q1PP/1B2RR1K w - - 0 1

Analysis by Deep Spark-0.3a:

1.Sa4 b5 2.Dd3 Sf6 3.Ld4 bxc4 4.bxc4 Lxa4 5.exf6
= (0.10) Tiefe: 6/9 00:00:00 42kN
1.Sg4 Sg6 2.Lc2 Le7 3.Lxg6 hxg6 4.Se4 Sc5 5.La3 Dc7 6.Sxc5 Lxc5 7.Lxc5 Dxc5 8.Df3 Td2 9.Te2 Txe2 10.Dxe2
+/= (0.70) Tiefe: 6/9 00:00:00 66kN
+/= (0.61) Tiefe: 15/32 00:00:02 26029kN
1.Se4!! Tc6 2.Df3 Sxe5 3.Lxe5 Dxe5 4.Sg4 Da5 5.Sef6+ gxf6 6.Lxh7+ Kxh7 7.Sxf6+ Kg6 8.h4 Tc5 9.b4 Tf5 10.Dg4+ Tg5 11.De4+ Sf5 12.bxa5 Lc6 13.Sd5 exd5 14.Dc2 Th5
+/- (0.86) Tiefe: 16/39 00:00:14 103mN
+- (1.93) Tiefe: 22/50 00:03:17 2741mN

regards Anton

[acase]

Hello

there is the second solution

Georgiev,K - Ionescu,C, Dubai ol (Men), Lxh7
1qrrbbk1/1p1nnppp/p3p3/4P3/2P5/1PN1N3/PB2Q1PP/1B2RR1K w - - 0 1

Analysis by Deep Spark-0.3a:

1.Sa4 b5 2.Dd3 Sf6 3.Ld4 bxc4 4.bxc4 Lxa4 5.exf6
= (0.10) Tiefe: 6/9 00:00:00 42kN
1.Sg4 Sg6 2.Lc2 Le7 3.Lxg6 hxg6 4.Se4 Sc5 5.La3 Dc7 6.Sxc5 Lxc5 7.Lxc5 Dxc5 8.Df3 Td2 9.Te2 Txe2 10.Dxe2
+/= (0.70) Tiefe: 6/9 00:00:00 66kN
+/= (0.61) Tiefe: 15/32 00:00:02 26029kN
1.Se4!! Tc6 2.Df3 Sxe5 3.Lxe5 Dxe5 4.Sg4 Da5 5.Sef6+ gxf6 6.Lxh7+ Kxh7 7.Sxf6+ Kg6 8.h4 Tc5 9.b4 Tf5 10.Dg4+ Tg5 11.De4+ Sf5 12.bxa5 Lc6 13.Sd5 exd5 14.Dc2 Th5
+/- (0.86) Tiefe: 16/39 00:00:14 103mN
+- (1.93) Tiefe: 22/50 00:03:17 2741mN

regards Anton

Hello Anton,

Actually Nxe4 is what most engines try to play and indeed it might win a long and drawn-out boring game , however Bxh7 is definitely much better and practically forces the win, and I am sure if you let Spark think a little longer it will probably agree that Bxh7 is better.

Remember, the eval should be at the very least +3.00 or better for white.

Andrew

[GARGAMEL]

the next attempt with longer time to reflect

Georgiev,K - Ionescu,C, Dubai ol (Men), Lxh7
1qrrbbk1/1p1nnppp/p3p3/4P3/2P5/1PN1N3/PB2Q1PP/1B2RR1K w - - 0 1

Analysis by Deep Spark-0.3a:

1.Dc2 Sg6 2.Sg4 Sc5 3.Se4 Lc6
= (0.15) Tiefe: 6/8 00:00:00 46kN
1.Sg4 Sg6 2.Lc2 Dc7 3.Lxg6 hxg6 4.Tf3 Sc5 5.Tef1 b6 6.h3 Dd7 7.Se4 Sxe4 8.Dxe4 Dd2 9.T3f2
+/= (0.46) Tiefe: 6/8 00:00:00 49kN
+/= (0.41) Tiefe: 16/36 00:00:04 53810kN
1.Se4 Tc6 2.Sg5 h6 3.Lh7+ Kh8 4.Le4 Kg8 5.Sh7 Tc5 6.Sg4 Sf5 7.Sxf8 Sxf8 8.La3 Tc7 9.Lxf5 exf5 10.Se3 f4 11.Sf5 Sg6 12.Ld6 Ld7 13.Lxc7 Dxc7 14.Sd6 Db6 15.Df2 Dc6 16.Df3
+/- (0.76) Tiefe: 16/36 00:00:07 108mN
+- (2.05) Tiefe: 26/62 00:31:39 30751mN
1.Lxh7!!+ Kxh7 2.Se4 Kg8 3.Sg5 g6 4.Dg4 Lg7 5.Dh3 Sc5 6.Sg4 Sf5 7.Dh7+ Kf8 8.Sf6 Ke7 9.Txf5 gxf5 10.Dxg7 Td3 11.Sxe8 Txe8 12.La3 Dc7 13.Dxf7+ Kd8 14.Dxc7+ Kxc7 15.Lxc5 Td2 16.a3 Kc6 17.Le3 Tb2
+- (2.33) Tiefe: 26/74 00:42:41 42585mN
+- (3.99) Tiefe: 26/74 00:51:13 50567mN

regard Anton

[beachknight]

Code: Select all

13: 1qrrbbk1/1p1nnppp/p3p3/4P3/2P5
1qrrbbk1/1p1nnppp/p3p3/4P3/2P5/1PN1N3/PB2Q1PP/1B2RR1K w - - 0 1

Analysis by Crafty 23.00:

21.Ng4 h5 22.Nf2 g6 23.Nce4 Nc6 24.Nd6 Bxd6 25.exd6 Nc5 26.Ne4 Nxe4 27.Bxe4 Rxd6 
  +/=  (0.54)   Depth: 12/28   00:00:01  5082kN
21.Ng4 h5 22.Nf2 g6 23.Nce4 Nf5 24.Rd1 Be7 25.Nd3 b5 26.cxb5 Qxb5 27.Bc2 
  +/=  (0.49)   Depth: 13/29   00:00:02  10932kN
21.Ng4 h5 22.Nf2 g6 23.Nce4 Nf5 24.Rd1 Be7 25.Nd6 Bxd6 26.exd6 Nxd6 27.Ne4 Nf5 
  +/=  (0.49)   Depth: 14/30   00:00:04  18369kN
21.Ng4 Nc5 22.Ba3 Ng6 23.Qe3 h5 24.Bxg6 hxg4 25.Bc2 Nd3 26.Bxd3 Bxa3 27.Rd1 Kh8 28.Qg5 
  +/=  (0.59)   Depth: 15/35   00:00:34  158mN
21.Ng4 Kh8 22.Ne4 Nf5 23.Ne3 Nxe3 24.Qxe3 Bb4 25.Re2 Nxe5 26.Ng5 f6 27.Qh3 h6 28.Nxe6 Rd2 29.Bxe5 fxe5 30.Rxd2 Bxd2 
  +/-  (0.75)   Depth: 16/39   00:01:59  562mN
21.Ng4 Kh8 22.Ne4 Nf5 23.Ne3 Bb4 24.Nxf5 exf5 25.Nd6 Bxe1 26.Nxc8 Bb4 27.Nd6 Bxd6 28.exd6 Qxd6 29.Bxf5 
  +/-  (0.96)   Depth: 17/40   00:03:19  949mN
21.Ng4 Kh8 22.Ne4 Nf5 23.Ne3 Nxe3 24.Qxe3 Bb4 25.Re2 Nf8 26.Qg3 Rc7 27.Nd6 Bc5 28.Be4 Rdd7 29.Rd2 Ng6 
  +/-  (0.94)   Depth: 18/38   00:03:55  1126mN
21.Ng4 Kh8 22.Ne4 Nf5 23.Ne3 Nxe3 24.Qxe3 Bb4 25.Re2 Nf8 26.Qg3 Rc7 27.Nd6 Bc5 28.Be4 Rcd7 29.Qg5 Ng6 30.Nxb7 
  +/-  (0.92)   Depth: 19/43   00:06:54  2003mN
21.Ng4 Kh8 22.Ne4 Nf5 23.Ne3 Nxe3 24.Qxe3 Bb4 25.Re2 Nf8 26.Qg3 Rc7 27.Nd6 Bc5 28.Be4 Rcd7 29.Qg5 h6 30.Qh5 Bxd6 31.exd6 Rxd6 
  +/-  (0.98)   Depth: 20/45   00:20:49  6082mN

(, chessengines20 11.02.2010)

[yanquis1972]

spark taking 43 minutes on anton's HW is not a good sign.

andrew's test positions must always be greeted with a sense of foreboding, though i'll run a few engines on this anyway.

i think it's cute that DJ plays the move without fully understanding it (though for me its eval dropped from .62 to .22, so its probably only at a certain depth that it would play it). this is how i and i imagine some GMs play as well, speculatively/intuitively. i imagine in a fluid game situation junior would find the decisive combination after playing Bxh7+.

[rlsuth]

Analysis by Rybka 3:

1.Bxh7+ Kh8 2.Ne4 Ng8 3.Ng5[]
+- (3.12) Depth: 16 00:00:00 1kN
1.Bxh7+ Kh8 2.Ne4 Ng8 3.Ng5[]
+- (3.12) Depth: 17 00:00:00 1kN
1.Bxh7+
+- (3.32 !) Depth: 18 00:01:58 24140kN
1.Bxh7+ Kxh7[] 2.Ne4 Kg8
+- (3.43) Depth: 18 00:03:35 42345kN
1.Bxh7+
+- (3.63 !) Depth: 19 00:07:41 92036kN
1.Bxh7+
+- (3.83 !) Depth: 19 00:12:41 153mN
1.Bxh7+ Kxh7[] 2.Ne4[] Kg8 3.Ng5[] g6 4.Qg4[]
+- (4.06) Depth: 19 00:23:50 292mN
1.Bxh7+ Kxh7[] 2.Ne4[] Kg8 3.Ng5[] g6 4.Qg4
+- (4.21) Depth: 20 00:40:45 502mN

[yanquis1972]

now clear the hash and see what you get.

[rlsuth]

now clear the hash and see what you get.

Analysis by Rybka 3:

1.Ne4 Ng6 2.Nd6 Bxd6 3.exd6 Qxd6 4.Rd1
= (0.05) Depth: 6 00:00:00 21kN
1.Ng4 Ng6 2.Bxg6 hxg6 3.Rd1
= (0.11) Depth: 6 00:00:00 27kN
1.Ng4 Ng6 2.Ne4 h5 3.Ngf2
= (0.11) Depth: 7 00:00:00 46kN
1.Ng4 Ng6 2.Ne4 h5 3.Ngf2
= (0.07) Depth: 8 00:00:00 55kN
1.Ng4 Ng6 2.Ne4 h5 3.Ngf2 Bb4
= (0.04) Depth: 9 00:00:00 87kN
1.Ng4
= (0.24 !) Depth: 10 00:00:00 216kN
1.Ng4 Ng6 2.Ne4 Be7 3.Nd6 Bxd6
= (0.05) Depth: 10 00:00:01 366kN
1.Ne4 Ng6 2.Ng5
= (0.16) Depth: 10 00:00:01 506kN
1.Ne4 Ng6 2.Ng5 Be7 3.Qh5 Bxg5 4.Bxg6 hxg6 5.Qxg5 Nc5 6.Rd1 Nd3 7.Ba1 Qc7
= (0.16) Depth: 11 00:00:02 570kN
1.Ne4 Ng6 2.Qh5 Bb4 3.Ng5 Ndf8 4.Re2 h6 5.Ne4 Nd7 6.Nd6 Bxd6 7.exd6 Qxd6 8.Bxg6 fxg6 9.Qf3 b5
= (0.17) Depth: 12 00:00:04 1291kN
1.Ne4
+/= (0.37 !) Depth: 13 00:00:05 1485kN
1.Ne4 Ng6 2.Qh5 Bb4 3.Ng5 Ndf8 4.Re2 h6 5.Ne4 Nd7 6.Ng4
+/= (0.37) Depth: 13 00:00:06 1696kN
1.Ne4
+/= (0.57 !) Depth: 14 00:00:18 4416kN
1.Ne4
+/- (0.77 !) Depth: 14 00:00:21 4945kN
1.Ne4 Ng6 2.Qh5 Bb4 3.Ng5 Ndf8 4.Ng4 Rd2 5.Bc1 Rd4 6.Re4 Rxe4 7.Nxe4 Kh8 8.Bb2 Qc7 9.Nd6 Bxd6
+/= (0.61) Depth: 14 00:00:24 5609kN
1.Ne4 Ng6 2.Qh5 Bb4 3.Ng5 Ndf8 4.Ng4 Rd2 5.Bc1 Rd4 6.Re4 Rxe4 7.Nxe4 Kh8 8.Bb2 Qc7 9.Nd6 Bxd6
+/= (0.61) Depth: 15 00:00:25 6137kN
1.Ne4
+/- (0.81 !) Depth: 16 00:00:48 10749kN
1.Ne4
+/- (1.01 !) Depth: 16 00:01:15 16399kN
1.Ne4 Rc6 2.Ng5 h6 3.Nh7 Rc5 4.Nxf8 Kxf8 5.Nd5
+/- (1.07) Depth: 16 00:02:44 38345kN
1.Ne4 Rc6 2.Ng5 h6 3.Nh7 Rc5 4.Nxf8 Kxf8 5.Nd5
+/- (1.07) Depth: 17 00:02:44 38345kN
1.Ne4
+/- (1.27 !) Depth: 18 00:04:08 54682kN
1.Ne4 Rc6 2.Ng5 h6 3.Nh7 Rc5 4.Nxf8 Nxf8 5.Ba3 Qxe5 6.Nd5 Rcxd5 7.Qxe5 Rxe5 8.Rxe5 Nc6 9.Re3 e5 10.Rd3 Nd4 11.Rg3 Nfe6
+/- (1.33) Depth: 18 00:05:24 68958kN
1.Ne4 b5 2.Nd6 Ng6 3.Nxc8 Rxc8 4.cxb5 axb5 5.Ng4 Be7 6.Rc1 Rd8 7.Bxg6 hxg6 8.Rfd1 Bg5 9.Rc2 Nb6 10.Rxd8 Qxd8 11.Bc1 Be7 12.Ne3 Qb8 13.Bb2
+- (1.45) Depth: 19 00:14:02 207mN
1.Ne4 Rc6 2.Ng5 h6 3.Nh7 Qc7 4.Qg4 Ng6 5.Bxg6 fxg6 6.Nxf8[] Nxf8 7.Ba3 Nh7 8.Bd6 Qd7 9.c5 b6 10.cxb6 Rxb6 11.Rd1 Rc6 12.Nc4 Ng5 13.Bb4 Qc7
+- (1.43) Depth: 20 00:34:58 518mN
1.Bxh7+
+- (1.65 !) Depth: 20 00:35:53 532mN
1.Bxh7+
+- (1.85 !) Depth: 20 00:37:20 548mN
1.Bxh7+
+- (2.25 !) Depth: 20 00:41:26 597mN
1.Bxh7+
+- (3.05 !) Depth: 20 00:54:35 764mN

[beachknight]

no change in craftys eval next hour (around 90 min analysis)

Code: Select all

13: 1qrrbbk1/1p1nnppp/p3p3/4P3/2P5
1qrrbbk1/1p1nnppp/p3p3/4P3/2P5/1PN1N3/PB2Q1PP/1B2RR1K w - - 0 1

Analysis by Glaurung 2.2 JA:

21.Ne4 Ng6 22.Qh5 Bb4 23.Ng5 Ndf8 24.Re2 h6 25.Ne4 Bc6 26.Nd6 Bxd6 27.exd6 Qxd6 
  +/-  (1.31)   Depth: 13   00:00:02  5282kN
21.Ne4 Nc5 22.Nd6 Rxd6 23.exd6 Qxd6 24.Rd1 Qb6 25.Qf2 f5 26.g4 g6 27.Qf4 Nc6 28.gxf5 exf5 
  +-  (1.64)   Depth: 14   00:00:02  8189kN
21.Ne4 Ng6 22.Qh5 Bb4 23.Ng5 Ndf8 24.Re2 h6 25.Ne4 Be7 26.Nd6 Bxd6 27.exd6 Qxd6 28.Qf3 e5 29.Qxb7 
  +-  (1.43)   Depth: 15   00:00:04  15070kN
21.Ne4 Ng6 22.Qh5 Bb4 23.Ng5 Ndf8 24.Re2 Rd2 25.Rxd2 Bxd2 26.Ng4 b5 27.Ne4 Nf4 28.Nh6+ gxh6 29.Qg4+ N8g6 30.Nxd2 Rd8 31.Rxf4 Rxd2 
  +/-  (1.27)   Depth: 16   00:00:06  20328kN
21.Ne4 Ng6 22.Qh5 Bb4 23.Ng5 Ndf8 24.Re2 Rd2 25.Rxd2 Bxd2 26.Ng4 b5 27.Ne4 bxc4 28.Nxd2 c3 29.Bxc3 Rxc3 30.Nc4 
  +-  (1.45)   Depth: 17   00:00:10  33409kN
21.Ne4 Ng6 22.Qh5 Bb4 23.Ng5 Ndf8 24.Re2 Rd2 25.Rxd2 Bxd2 26.Ng4 b5 27.Ne4 bxc4 28.Nxd2 c3 29.Bxc3 Rxc3 30.Nc4 Bc6 
  +/-  (1.37)   Depth: 18   00:00:16  55862kN
21.Ne4 Ng6 22.Qh5 Bb4 23.Ng5 Ndf8 24.Re2 Rd2 25.Rxd2 Bxd2 26.Ng4 b5 27.Ne4 bxc4 28.Nxd2 c3 29.Bxc3 Rxc3 30.Be4 Bc6 31.g3 Bxe4+ 32.Nxe4 
  +/-  (1.00)   Depth: 19   00:00:42  156mN
21.Ne4 Ng6 22.Qh5 Bb4 23.Ng5 Ndf8 24.Re2 Rd2 25.Rxd2 Bxd2 26.Ng4 b5 27.Ba3 Bxg5 28.Qxg5 bxc4 29.bxc4 Rxc4 30.Bd3 h6 31.Qh5 Rf4 
  +/-  (1.09)   Depth: 20   00:01:34  355mN
21.Ne4 Ng6 22.Qh5 Bb4 23.Ng5 Ndf8 24.Re2 Rd2 25.Rxd2 Bxd2 26.Ng4 b5 27.Ba3 Bxg5 28.Qxg5 bxc4 29.bxc4 Rxc4 30.Bd3 h6 31.Qh5 Rf4 32.Rd1 
  +/-  (0.92)   Depth: 21   00:03:05  710mN
21.Ne4 Rc6 22.Ng5 h6 23.Nh7 Ng6 24.Bxg6 fxg6 25.Nxf8 Nxf8 26.Ba3 Nh7 27.Bd6 Qc8 28.Rd1 Rd7 29.Qg4 Bf7 30.Nc2 b6 31.Nd4 Nf6 32.Qf3 Rcxd6 33.exd6 Rxd6 
  +-  (2.07)   Depth: 22   00:34:44  8125mN

(, chessengines20 11.02.2010)