ICT Leiden : first round , first surprise !?!

[Belgian]

Hi,

The Baron - Rybka : 1/2 - 1/2

Zap!Chess, Hiarcs, and Deep Sjeng won their first game

Best
Johan

[Spock]

With such a small number of games, anything can happen in these tournaments. The strongest engine doesn't always win

It is not a given that the Baron will always lose to Rybka. It will be able to draw some games, and this is what happened here. No disrespect to The Baron, which is an excellent program, but all it needs is for a couple of engines to get a "lucky" draw against Rybka and that could shake things up

[Guetti]

I wonder what "Stoofvlees" is? A successor to Sjeng?

[Belgian]

I wonder what "Stoofvlees" is? A successor to Sjeng?

Stoofvlees is a flemish meal

best
Johan

[Theo van der Storm]

I wonder what "Stoofvlees" is? A successor to Sjeng?

Stoofvlees is a flemish meal

best
Johan

Stoofvlees = Meat stew

GCP wrote:
"Stoofvlees" is een rewrite van Deep Sjeng met een nieuwe search en
evaluatie, die momenteel nog een eind slechter is dan Deep Sjeng zelf,
maar die wel meer gedurfde technieken bevat en vaak veel interessanter
partijen speelt. Het draait op Intel Centrino 1500Mhz.

"Stoofvlees" is a rewrite of Deep Sjeng with new search and
evaluation, which is a lot weaker than Deep Sjeng momentarily,
but contains more daring techniques and often plays much more interesting games. It runs on Intel Centrino 1500Mhz.

[Uri Blass]

Hi,

The Baron - Rybka : 1/2 - 1/2

Zap!Chess, Hiarcs, and Deep Sjeng won their first game

Best
Johan

I believe that rybka missed a win by 69...Kg2

Here is the game with some analysis
It seems that 70.g4 is losing and I did not check other alternatives

[Event "ICT7"]
[Site "Leiden, NED"]
[Date "2007.05.18"]
[Round "1"]
[White "The Baron"]
[Black "Rybka"]
[Result "1/2-1/2"]
[ECO "D97"]
[PlyCount "149"]
[EventDate "2007.??.??"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qb3 dxc4 6. Qxc4 O-O 7. e4 Na6 8.
Be2 c5 9. d5 e6 10. O-O exd5 11. exd5 Bf5 12. Be3 Qb6 13. b3 Rfe8 14. Rad1 Rad8
15. Na4 Qd6 16. Nxc5 Nxc5 17. Bxc5 Qd7 18. Bd4 a6 19. Bd3 b5 20. Bxf5 Qxf5 21.
Qc6 Nxd5 22. Bxg7 Kxg7 23. Qc5 Qe6 24. Rde1 Qd7 25. Qd4+ Nf6 26. Qa1 Qf5 27. h3
a5 28. a3 Rxe1 29. Rxe1 Qc2 30. Ng5 Qd2 31. Nf3 Qd6 32. Qc1 Rd7 33. Qa1 Qc7 34.
Rc1 Qd8 35. Re1 Rd3 36. b4 Qd6 37. Qb2 a4 38. Ng5 Rd5 39. Nf3 h6 40. Qa1 Rd3
41. Ne5 Rd2 42. Nf3 Rd5 43. Qc3 Rd3 44. Qc1 Nd7 45. h4 Rd5 46. Qc3+ Qf6 47. Qc7
Rd3 48. Qc1 Nb6 49. Ne5 Rd4 50. Qc5 Rd5 51. Qc7 Rd2 52. Qc5 h5 53. g3 Nd5 54.
Nd7 Qf5 55. Re8 Qxd7 56. Qf8+ Kf6 57. Re1 Nf4 58. Qh8+ Kf5 59. Qe5+ Kg4 60.
Qxf4+ Kh3 61. Qf3 Qd5 62. Qxd5 Rxd5 63. Kf1 Rd3 64. Re5 Rxa3 65. Rxb5 Rb3 66.
Rb7 Rb2 67. Ra7 Rxb4 68. Rxf7 Rb1+ 69. Ke2 a3 (69... Kg2 70. g4 a3 71. Ra7 (71.
gxh5 a2 72. Ra7 a1=Q 73. Rxa1 Rxa1) 71... hxg4 72. Ra4 (72. Ke3 Rb2 73. Kf4
Rb4+ 74. Ke3 Rb3+ 75. Kf4 Kh3 76. Kg5 g3 77. fxg3 Rxg3+ 78. Kf4 Rg4+ 79. Kf3 (
79. Ke5 Rxh4 80. Kf6) 79... Rxh4) 72... Rb2+ 73. Ke3 Rb3+ 74. Kf4 Kh3 75. Kg5
Rf3 76. Ra7 g3 77. fxg3 Rxg3+) 70. Ra7 Rb2+ 71. Kf3 a2 72. Kf4 Rxf2+ 73. Kg5
Rg2 74. Kxg6 Kxg3 75. Kxh5 1/2-1/2

[Leto]

Hi,

The Baron - Rybka : 1/2 - 1/2

Zap!Chess, Hiarcs, and Deep Sjeng won their first game

Best
Johan

I believe that rybka missed a win by 69...Kg2

Here is the game with some analysis
It seems that 70.g4 is losing and I did not check other alternatives

[Event "ICT7"]
[Site "Leiden, NED"]
[Date "2007.05.18"]
[Round "1"]
[White "The Baron"]
[Black "Rybka"]
[Result "1/2-1/2"]
[ECO "D97"]
[PlyCount "149"]
[EventDate "2007.??.??"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qb3 dxc4 6. Qxc4 O-O 7. e4 Na6 8.
Be2 c5 9. d5 e6 10. O-O exd5 11. exd5 Bf5 12. Be3 Qb6 13. b3 Rfe8 14. Rad1 Rad8
15. Na4 Qd6 16. Nxc5 Nxc5 17. Bxc5 Qd7 18. Bd4 a6 19. Bd3 b5 20. Bxf5 Qxf5 21.
Qc6 Nxd5 22. Bxg7 Kxg7 23. Qc5 Qe6 24. Rde1 Qd7 25. Qd4+ Nf6 26. Qa1 Qf5 27. h3
a5 28. a3 Rxe1 29. Rxe1 Qc2 30. Ng5 Qd2 31. Nf3 Qd6 32. Qc1 Rd7 33. Qa1 Qc7 34.
Rc1 Qd8 35. Re1 Rd3 36. b4 Qd6 37. Qb2 a4 38. Ng5 Rd5 39. Nf3 h6 40. Qa1 Rd3
41. Ne5 Rd2 42. Nf3 Rd5 43. Qc3 Rd3 44. Qc1 Nd7 45. h4 Rd5 46. Qc3+ Qf6 47. Qc7
Rd3 48. Qc1 Nb6 49. Ne5 Rd4 50. Qc5 Rd5 51. Qc7 Rd2 52. Qc5 h5 53. g3 Nd5 54.
Nd7 Qf5 55. Re8 Qxd7 56. Qf8+ Kf6 57. Re1 Nf4 58. Qh8+ Kf5 59. Qe5+ Kg4 60.
Qxf4+ Kh3 61. Qf3 Qd5 62. Qxd5 Rxd5 63. Kf1 Rd3 64. Re5 Rxa3 65. Rxb5 Rb3 66.
Rb7 Rb2 67. Ra7 Rxb4 68. Rxf7 Rb1+ 69. Ke2 a3 (69... Kg2 70. g4 a3 71. Ra7 (71.
gxh5 a2 72. Ra7 a1=Q 73. Rxa1 Rxa1) 71... hxg4 72. Ra4 (72. Ke3 Rb2 73. Kf4
Rb4+ 74. Ke3 Rb3+ 75. Kf4 Kh3 76. Kg5 g3 77. fxg3 Rxg3+ 78. Kf4 Rg4+ 79. Kf3 (
79. Ke5 Rxh4 80. Kf6) 79... Rxh4) 72... Rb2+ 73. Ke3 Rb3+ 74. Kf4 Kh3 75. Kg5
Rf3 76. Ra7 g3 77. fxg3 Rxg3+) 70. Ra7 Rb2+ 71. Kf3 a2 72. Kf4 Rxf2+ 73. Kg5
Rg2 74. Kxg6 Kxg3 75. Kxh5 1/2-1/2

Interesting that Rybka 2.3.2 played 69...a3, my Rybka 2.2 prefers to play Kg2 after depth 22, and it reached depth 23 very quickly at just 21 seconds on two-year-old hardware with just 5-piece tablebases:


Analysis by Rybka 2.2 mp:

69...a3
µ (-1.07) Depth: 2 00:00:00
69...a3
µ (-1.22) Depth: 4 00:00:00
69...a3
µ (-1.22) Depth: 4 00:00:00
69...a3 70.Ra7
-+ (-1.52) Depth: 5 00:00:00
69...a3 70.Ra7 Rb2+ 71.Ke3 a2 72.Kf3 Kh2
-+ (-1.57) Depth: 9 00:00:00 7kN
69...a3 70.Ra7 Rb2+ 71.Ke3 a2 72.Kf3 Kh2
-+ (-1.57) Depth: 9 00:00:00 7kN
69...a3 70.Ra7 Rb2+ 71.Ke3 a2 72.Kf3 Kh2
-+ (-1.57) Depth: 9 00:00:00 7kN
69...a3 70.Ra7 Rb2+ 71.Kf3 a2 72.Ra4 Kh2 73.Ke3
-+ (-1.56) Depth: 9 00:00:00 11kN
69...a3 70.Ra7 Rb2+ 71.Kf3 a2 72.Ra4 Kh2 73.Ke3 Kg2 74.Kd3
-+ (-1.56) Depth: 10 00:00:00 15kN
69...a3 70.Ra7 Rb2+ 71.Kf3 a2 72.Ra4 Kh2 73.Ke3 Kg2 74.g4
-+ (-1.52) Depth: 11 00:00:00 20kN
69...a3 70.Ra7 Rb2+ 71.Kf3 a2 72.Ra4 Kh2 73.Ke3 Kg2 74.g4 hxg4
-+ (-1.52) Depth: 12 00:00:00 27kN
69...a3 70.Ra7 Rb2+ 71.Kf3 a2 72.Ra4 Kh2 73.Ke3 Kg2 74.g4 hxg4 75.Rxg4+ Kf1
-+ (-1.48) Depth: 13 00:00:00 38kN
69...a3 70.Ra7 Rb2+ 71.Kf3 a2 72.Ra4 Kh2 73.Ke3 Kg2 74.g4 hxg4 75.Rxg4+ Kf1 76.Ra4
-+ (-1.54) Depth: 14 00:00:00 59kN
69...a3 70.Ra7 Rb2+ 71.Kf3 a2 72.Ra6 Kh2 73.g4 hxg4+ 74.Kxg4 Rxf2 75.Kg5 Rg2+ 76.Kf4
-+ (-1.54) Depth: 15 00:00:00 90kN
69...a3 70.Ra7 Rb2+ 71.Kf3 a2 72.Ra6 Kh2 73.g4 hxg4+ 74.Kxg4 Rxf2 75.Kg5 Rg2+ 76.Kf4
-+ (-1.57) Depth: 16 00:00:01 168kN
69...a3 70.Ra7 Rb2+ 71.Kf3 a2 72.Ra6 Kh2 73.g4 hxg4+ 74.Kxg4 Rxf2 75.Kg5 Rg2+ 76.Kf4
-+ (-1.53) Depth: 18 00:00:01 291kN
69...a3 70.Ra7 Rb2+ 71.Kf3 a2 72.Ra6 Kh2 73.g4 hxg4+ 74.Kxg4 Rxf2 75.Kg5 Rg2+ 76.Kf4
-+ (-1.53) Depth: 18 00:00:01 366kN
69...a3 70.Ra7 Rb2+ 71.Kf3 a2 72.Ra6 Rd2 73.Ra7 Kh2 74.g4 hxg4+ 75.Kxg4 Rxf2 76.Kg5
µ (-1.33) Depth: 19 00:00:02 712kN
69...a3 70.Ra7 Rb2+ 71.Kf3 a2 72.Ra6 Rd2 73.Ra7 Rc2 74.Ra8 Kh2 75.g4 Kg1 76.gxh5
µ (-1.40) Depth: 20 00:00:05 1454kN
69...a3 70.Ra7 Rb2+ 71.Kf3 a2 72.Ra6 Rd2 73.Ra7 Rc2 74.Ra8 Kh2 75.g4 Kg1 76.gxh5
µ (-1.27) Depth: 21 00:00:07 2192kN
69...a3 70.Ra7 Rb2+ 71.Kf3 a2 72.Ra6 Rd2 73.Ra7 Rc2 74.Ra8 Kh2 75.g4 Kg1 76.gxh5
µ (-1.31) Depth: 22 00:00:12 3700kN
69...a3 70.Ra7 Rb2+ 71.Kf3 a2 72.Ra6 Rd2 73.Ra7 Rc2 74.Ra6 Rd2 75.Ra7 Rc2 76.Ra6
µ (-1.29) Depth: 23 00:00:21 6776kN
69...Kg2 70.Ra7 Rb2+ 71.Kd3 Rxf2 72.Rxa4 Rf3+ 73.Kd4 Kxg3 74.Ra6 Rf4+ 75.Ke5 Rg4 76.Ra1
-+ (-1.50) Depth: 23 00:00:52 16502kN
69...Kg2 70.Ra7 Rb2+ 71.Kd3 Rxf2 72.Rxa4 Rf3+ 73.Ke4 Kxg3 74.Ra1 Rf4+ 75.Ke5 Rf5+ 76.Ke4
-+ (-1.67) Depth: 24 00:01:13 23375kN
69...Kg2 70.Ra7 Rb2+ 71.Kd3 Rxf2 72.Rxa4 Rf3+ 73.Ke4 Kxg3 74.Ra1 Rf4+ 75.Ke5 Rf5+ 76.Ke4
-+ (-1.82) Depth: 25 00:01:47 34865kN
69...Kg2 70.Ra7 Rb2+ 71.Kd3 Rxf2 72.Rxa4 Rf3+ 73.Ke4 Kxg3 74.Ra1 Rf4+ 75.Ke5 Rf5+ 76.Ke4
-+ (-1.82) Depth: 26 00:02:46 55334kN
69...Kg2 70.Ra7 Rb2+ 71.Kd3 Rxf2 72.Rxa4 Rf3+ 73.Ke4 Kxg3 74.Ra1 Rf4+ 75.Ke5 Rf5+ 76.Ke4
-+ (-1.82) Depth: 27 00:03:27 68433kN
69...Kg2 70.Ra7 Rb2+ 71.Kd3 Rxf2 72.Rxa4 Rf3+ 73.Ke4 Kxg3 74.Ra1 Rf4+ 75.Ke5 Rf5+ 76.Ke4
-+ (-1.94) Depth: 28 00:11:53 237mN

[M ANSARI]

Yes poor endgame play by Rybka. DF10 gets Kg2 almost instantly as probably quite a few other engines I suppose. I think it has more to do with the understanding of what drawn rook vs pawn engames are. This type of knowledge should be added to Rybka as Rybka matures. Ryba just didn't realize that the resulting endgame position would be drawn even with extra material. Otherwise it was a fantastic game by Rybka.