I don't think so ....

The two flavors of Rybka Beta10d went 28-3-12 against all non Rybka
opponents - in this Game/5 with 5 second increment tournament. 3
Losses in just 43 game against some of the best chess programs in the
world - Shredder 9, Shredder 8, Fruit, Toga, Ruffian, Rebel 12 etc
etc. Rybka has leapfrog the all other chess programs, the likes of
which we have seen since the early days of chess programmming.

I'm ending the tournament now so I can start testing Beta 11.
All games were played with a common book , 256MB Hash, Pondering on and
in single cpu mode for each engine on Windows Xp64.


1/20/2006 1:50:02 AM :

Program Elo + - Games Score Av.Op. Draws

1 Rybka v1.01 Beta 10d.x64 2817 128 119 26 76.9 % 2608 30.8 %
2 Rybka v1.01 Beta 10d.x64 MFB 2787 125 119 26 73.1 % 2614 30.8 %
3 Rybka v1.0 Preview 2 x64 2763 123 117 26 69.2 % 2622 30.8 %
4 Rybka v1.01 Beta 9.x64 2726 112 108 26 65.4 % 2615 38.5 %
5 Shredder 8 2695 111 108 26 61.5 % 2613 38.5 %
6 Toga II 2657 98 96 26 55.8 % 2617 50.0 %
7 GFruit-4bx 2652 113 111 26 55.8 % 2612 34.6 %
8 Rebel 12 2644 116 115 26 53.8 % 2617 30.8 %
9 Fruit 2.1 2637 116 115 26 53.8 % 2611 30.8 %
10 Gandalf60 2619 101 101 26 50.0 % 2619 46.2 %
11 Ruffian 2.1 2602 104 105 26 48.1 % 2615 42.3 %
12 Zappa 1.1 2601 104 105 26 48.1 % 2614 42.3 %
13 Shredder 9.1 2585 115 116 26 46.2 % 2612 30.8 %
14 Pro Deo 2571 108 109 26 42.3 % 2625 38.5 %
15 Shredder Classic 1.3 2570 115 117 26 42.3 % 2624 30.8 %
16 Deep Sjeng 1.6 2539 112 114 26 40.4 % 2607 34.6 %
17 TheKing 3.23 2523 112 115 26 36.5 % 2619 34.6 %
18 SOS 5.1 for Arena 2493 113 117 26 32.7 % 2618 34.6 %
19 Crafty64 19.20 2438 135 144 26 25.0 % 2629 19.2 %
20 AnMon 5.50 2421 132 141 26 23.1 % 2630 23.1 %

Engine Score Ry Ry Ry Ry Sh GF To Re Fr Ga
01 Rybka v1.01 Beta 10d.x64 20.0/26 ·· 1 == =0 = = =1 1 1 =1
02 Rybka v1.01 Beta 10d.x64 MFB 19.0/26 0 ·· 11 = 10 10 = 11 11 =
03 Rybka v1.0 Preview 2 x64 18.0/26 == 00 ·· == 11 1 = 1 0 =
04 Rybka v1.01 Beta 9.x64 17.0/26 =1 = == ·· = = 1= 1 1=
05 Shredder 8 16.0/26 = 01 00 = ·· = 1 =0= =
06 GFruit-4bx 14.5/26 = 01 0 = = ·· 0= 0 1 1=
07 Toga II 14.5/26 =0 = = 0 0 1= ·· 10== =
08 Rebel 12 14.0/26 0 00 0 = =1 1 01 ·· 0 =
09 Fruit 2.1 14.0/26 0 00 1 0 = 0 == 1 ·· 0
10 Gandalf60 13.0/26 =0 = = 0= = 0= = = 1 ··
11 Zappa 1.1 12.5/26 0 = 0 0= 0 1 0= = 1 11
12 Ruffian 2.1 12.5/26 0 = 0 1 =1 1= = 00 =0 0
13 Shredder 9.1 12.0/26 0 0 0 =0 0 = =0 1 = 10
14 Shredder Classic 1.3 11.0/26 0 0= 0= 1 0= = 1 01 00 =
15 Pro Deo 11.0/26 =0 0 00 10 = 0 = = 1 =1
16 Deep Sjeng 1.6 10.5/26 1 0 1 0 0 00 = 0= 0= 0
17 TheKing 3.23 9.5/26 00 = 0 0 = 01 = = 0= 0
18 SOS 5.1 for Arena 8.5/26 0 = = 1 00 0= 0 00 00 =
19 Crafty64 19.20 6.5/26 0 00 00 0 00 0 0 0 0 0
20 AnMon 5.50 6.0/26 00 0 0 00 0 0 00 = = =0


Engine Score Za Ru Sh Sh Pr De Th SO Cr An
01 Rybka v1.01 Beta 10d.x64 20.0/26 1 1 1 1 =1 0 11 1 1 11
02 Rybka v1.01 Beta 10d.x64 MFB 19.0/26 = = 1 1= 1 1 = = 11 1
03 Rybka v1.0 Preview 2 x64 18.0/26 1 1 1 1= 11 0 1 = 11 1
04 Rybka v1.01 Beta 9.x64 17.0/26 1= 0 =1 0 01 1 1 0 1 11
05 Shredder 8 16.0/26 1 =0 1 1= = 1 = 11 11 1
06 GFruit-4bx 14.5/26 0 0= = = 1 11 10 1= 1 1
07 Toga II 14.5/26 1= = =1 0 = = = 1 1 11
08 Rebel 12 14.0/26 = 11 0 10 = 1= = 11 1 =
09 Fruit 2.1 14.0/26 0 =1 = 11 0 1= 1= 11 1 =
10 Gandalf60 13.0/26 00 1 01 = =0 1 1 = 1 =1
11 Zappa 1.1 12.5/26 ·· 1= = = == =0 =0 1 0 1
12 Ruffian 2.1 12.5/26 0= ·· 0= = 1 = 1 = =1 1
13 Shredder 9.1 12.0/26 = 1= ·· 1 = 10 10 =01 1
14 Shredder Classic 1.3 11.0/26 = = 0 ·· 1 1 1 =0 10 0
15 Pro Deo 11.0/26 == 0 = 0 ·· 1 1= 0 = 10
16 Deep Sjeng 1.6 10.5/26 =1 = 01 0 0 ·· 1 = == =1
17 TheKing 3.23 9.5/26 =1 0 01 0 0= 0 ·· 1 1 ==
18 SOS 5.1 for Arena 8.5/26 0 = =1 =1 1 = 0 ··0= 0
19 Crafty64 19.20 6.5/26 1 =0 0 01 = == 0 1= ·· 1
20 AnMon 5.50 6.0/26 0 0 0 1 01 =0 == 1 0 ··


260 of 260 games played
Name of the tournament: Blitz_5_5_QUAD RR_2_b
Site/ Country: WIN-64-MB, United States
Level: Blitz 5/5
Hardwa Dual AMD Opteron(tm) Processor 244 1804 MHz with 2,046 MB
Memory
Operating system: Microsoft Windows Server 2003 Professional Service
Pack 1 (Build 3790)

to find out more about the Rybka chess engine - visit the author's
webpage:

Note - I have no financial interest in Rybka --- I'm posting about
Rybka because it is so rare for a chess program to appear out of
virtually no where and dominate all other chess engines. Serious chess
players might want to take note of this new chess engine.

http://www.rybkachess.com/

free updates are available to Rybka customers from Yahoo Groups

http://games.groups.yahoo.com/group/...v1x_customers/

There are already 500 Rybka devotees and counting...

Does your engine find Rxc5

r2qk2r/1pp1bpp1/p1n3b1/P1n3P1/3pPB1p/1B1P1N1P/1P1N1P2/2RQR1K1 w kq - 0
1

FEN: r2qk2r/1pp1bpp1/p1n3b1/P1n3P1/3pPB1p/1B1P1N1P/1P1N1P2/2RQR1K1 w kq
- 0 1

FEN: r2qk2r/1pp1bpp1/p1n3b1/P1n3P1/3pPB1p/1B1P1N1P/1P1N1P2/2RQR1K1 w kq
- 0 1

Rybka 1.01 Beta 11:
3 00:00 1.304 0 -0.09 1.Ne5 Bh5 2.Qc2 0-0 3.g6 Nxe5 4.Bxe5
Bxg6
4 00:00 1.304 0 -0.29 1.Ne5 Bh5 2.Qc2 0-0 3.g6 Nxe5 4.Bxe5
Bxg6
5 00:00 2.440 0 -0.29 1.Ne5 Bh5 2.Qc2 0-0 3.g6 Nxe5 4.Bxe5
Bxg6
6 00:00 4.304 0 -0.74 1.Ne5 Bh5 2.Qc2 0-0 3.g6 Nxe5 4.Bxe5
Bxg6
6 00:00 6.672 0 -0.36 1.Nc4 Bh5 2.Bc2 Ne6
6 00:00 7.400 0 -0.32 1.Rxc5 Bxc5 2.Ba4 0-0 3.Bxc6 bxc6
4.Nxh4 Bh7
6 00:00 8.309 60.343 -0.22 1.Nf1 Bh5 2.N1h2 Ne6
7 00:00 14.875 69.552 -0.35 1.Nf1 Bh5 2.Bd5 Ne6
7 00:00 15.595 67.954 -0.27 1.Rxc5 Bxc5 2.Ba4 0-0 3.Bxc6 bxc6
4.Nxh4 Bh7
8 00:00 17.059 69.595 -0.27 1.Rxc5 Bxc5 2.Ba4 0-0 3.Bxc6 bxc6
4.Nxh4 Bh7
9 00:00 24.169 75.225 -0.30 1.Rxc5 Bxc5 2.Ba4 0-0 3.Bxc6 bxc6
4.Nxh4 Bh7
10 00:00 60.655 84.504 -0.33 1.Rxc5 Bxc5 2.Ba4 0-0 3.Bxc6 bxc6
4.Nxh4 Bh7
10 00:01 100.424 101.214 -0.30 1.Qe2 Nxb3 2.Nxb3 Bh5 3.Nc5 Qc8
4.Kh2 0-0
11 00:02 195.693 93.596 -0.34 1.Qe2 Nxb3 2.Nxb3 Bh5 3.Nc5 Qc8
4.Kh2 0-0 5.Rc2
11 00:03 293.449 90.700 -0.33 1.Ne5 Bh5 2.Qc2 0-0 3.g6 Nxe5
4.Bxe5 Bxg6 5.Nf3
12 00:07 605.108 82.266 -0.34 1.Ne5 Bh5 2.Qc2 0-0 3.g6 Nxe5
4.Bxe5 Bxg6 5.Nf3 Qd7
13 00:39 2.728.151 70.334 -0.54 1.Ne5 Nxe5 2.Bxe5 Qd7 3.Bc4 Bh5
4.Qc2 Qxh3 5.b4 Ne6 6.Bxe6
13 00:58 4.175.412 73.479 -0.43 1.Rxc5 Bxc5 2.Qc2 Bb4 3.Ba4 0-0
4.Qc4 Bd6 5.e5 Nxa5
14 01:25 6.273.565 75.163 -0.38 1.Rxc5 Bxc5 2.Qc2 Bb4 3.Ba4 0-0
4.Qc4 Bd6 5.e5 Nxa5 6.Qxd4
15 02:28 11.280.250 77.547 -0.44 1.Rxc5 Bxc5 2.Ba4 0-0 3.Qc1 Bb4
4.Bxc6 bxc6 5.Qxc6 Rb8 6.Rb1 Bh5 7.Nxh4 Bd6


A Rybka Devotee

but don't take my word for it....

http://www.chessolympiad-torino2006....&dettaglio=309

good stuff...

There are a number of _free_ engines calculating Rxc5 in ca. 1 minute or less:
FEN: r2qk2r/1pp1bpp1/p1n3b1/P1n3P1/3pPB1p/1B1P1N1P/1P1N1P2/2RQR1K1 w kq - 0 1

Rybka 1.0 Beta 32-bit:

6 00:00 2.532 32.819 -0,42 Sf3e5 Lg6h5 Dd1c2 00 g5g6 Sc6xe5 Lf4xe5 Sc5xb3 Dc2xb3 Le7d6
6 00:00 3.670 39.558 -0,35 Tc1xc5 Le7xc5 Dd1c2 Lc5b4 Lb3a4 00 Dc2c4 Lb4d6 Lf4xd6 c7xd6
7 00:00 7.212 46.741 -0,36 Tc1xc5 Le7xc5 Dd1c2 Lc5b4 Lb3a4 00 Dc2c4 Lb4d6 Lf4xd6 c7xd6
8 00:00 8.350 49.424 -0,40 Tc1xc5 Le7xc5 Dd1c2 Lc5b4 Lb3a4 00 Dc2c4 Lb4d6 Lf4xd6 c7xd6
9 00:00 15.723 56.891 -0,32 Tc1xc5 Le7xc5 Dd1c2 Lc5b4 Lb3a4 00 Dc2c4 Lb4d6 Lf4xd6 c7xd6
10 00:00 32.670 64.708 -0,28 Tc1xc5 Le7xc5 Dd1c2 Lc5b4 Lb3a4 00 Dc2c4 Lb4d6 Lf4xd6 c7xd6
11 00:00 62.152 66.712 -0,33 Tc1xc5 Le7xc5 Dd1c2 Lc5b4 Lb3a4 00 Dc2c4 Lb4d6 Lf4xd6 c7xd6
12 00:00 62.685 66.174 -0,39 Tc1xc5 Le7xc5 Dd1c2 Lc5b4 Lb3a4 00 Dc2c4 Lb4d6 Lf4xd6 c7xd6
13 00:05 352.200 65.182 -0,41 Tc1xc5 Le7xc5 Dd1c2 Lc5b4 Lb3a4 00 Dc2c4 Lb4d6 e4e5 Sc6xa5
14 00:36 2.482.462 70.927 -0,38 Tc1xc5 Le7xc5 Dd1c2 Lc5b4 Lb3a4 00 Dc2c4 Lb4d6 e4e5 Sc6xa5
15 01:20 5.260.651 67.444 -0,36 Tc1xc5 Le7xc5 Dd1c2 Lc5d6 e4e5 Ld6b4 e5e6 00 Sf3xh4 f7xe6

Arion 1.6:

8/17 00:03 2.181.637 734.000 -0,82 Lb3c4 Sc6xa5 b2b4 Sa5xc4 b4xc5 Sc4a5 Dd1a4+ Sa5c6 Tc1b1
8/18 00:03 2.692.351 739.000 -0,72 Tc1xc5 Le7xc5 Lb3a4
9/19 00:05 4.094.795 757.000 -0,73 Tc1xc5 Le7xc5 Lb3a4 Lc5d6 Lf4xd6 Dd8xd6 La4xc6+ b7xc6
9/23 00:10 8.567.176 792.000 -0,70 Sd2f1 Sc6xa5 Lb3d5 c7c6 Ld5a2 Dd8c8 b2b4 Dc8xh3 b4xa5 Dh3g4+
10/24 00:15 12.702.350 792.000 -0,67 Sd2f1 Sc6xa5 Lb3d5 c7c6 Ld5a2 Sc5d7 Dd1a4 c6c5 La2d5 b7b5
10/24 00:17 13.740.236 794.000 -0,48 Tc1xc5 Le7xc5 Lb3a4 Lc5d6 e4e5 Ld6b4 La4xc6+ b7xc6 Dd1a4 Ta8b8 Da4xc6+ Dd8d7 Sf3xd4 Dd7xc6 Sd4xc6 Lb4xd2 Lf4xd2 Tb8xb2
11/24 00:26 21.880.207 823.000 -0,54 Tc1xc5 Le7xc5 Lb3a4 Lc5d6 e4e5 Ld6e7 Dd1b3 Ke8f8 La4xc6 b7xc6 Te1c1 Ta8b8
12/28 01:25 71.320.650 829.000 -0,43 Tc1xc5 Le7xc5 Lb3d5 Dd8d7 Dd1c2 Lc5d6 Ld5xc6 b7xc6 Lf4xd6 c7xd6 Sf3xd4 00 Te1e3

Glaurung 1.0 beta 1:

9/23 00:00 248.799 378.689 -0,81 Sd2b1 Sc6xa5 Lb3a2 Dd8d7 Sf3e5 Dd7xh3 Se5xg6 f7xg6 Lf4xc7 Sc5xd3 Lc7xa5 Sd3xe1 Dd1xe1 Le7xg5
9/24 00:00 303.604 388.240 -0,59 Tc1xc5 Le7xc5 Lb3d5 Lc5d6 Lf4xd6 c7xd6 Dd1a4 00 Ld5xc6 b7xc6 Da4xd4
9/24 00:01 581.369 383.488 -0,39 Lb3c4 Sc6xa5 Lf4e5 b7b5 Lc4a2 Sc5xd3 Le5xc7 Dd8c8 Lc7xa5 Sd3xc1 Dd1xc1 Dc8xh3 Sf3xd4 Le7xg5
10/24 00:01 626.224 388.959 -0,39 Lb3c4 Sc6xa5 Lf4e5 b7b5 Lc4a2 Sc5xd3 Le5xc7 Dd8c8 Lc7xa5 Sd3xc1 Dd1xc1 Dc8xh3 Sf3xd4 Le7xg5
11/27 00:02 1.034.323 406.094 -0,48 Lb3c4 Sc6xa5 Lf4e5 Sa5c6 b2b4 Sc6xb4 Sd2b3 Sc5xb3 Lc4xb3 c7c5 Le5xg7
12/27 00:05 2.392.015 424.040 -0,43 Lb3c4 Sc6xa5 Lf4e5 Sa5c6 b2b4 Sc6xb4 Sd2b3 b7b5 Le5xg7 b5xc4 Sb3xc5 Le7xc5 Lg7xh8 Sb4xd3 Tc1xc4 Sd3xe1 Tc4xc5 Se1xf3+ Dd1xf3
13/32 00:15 6.561.405 418.670 -0,45 Lb3c4 Sc6xa5 Lf4e5 Lg6h5 g5g6 Lh5xg6 Sd2b3 Sa5xb3 Lc4xb3 Lg6h5 Le5xg7 Lh5xf3 Dd1xf3 Sc5xb3 Lg7xh8 Sb3xc1 Te1xc1
14/33 00:31 13.064.053 411.051 -0,45 Lb3c4 Sc6xa5 Lf4e5 Lg6h5 g5g6 Lh5xg6 Sd2b3 Sa5xb3 Lc4xb3 Lg6h5 Le5xg7 Lh5xf3 Dd1xf3 Sc5xb3 Lg7xh8 Sb3xc1 Te1xc1
14/33 00:43 17.962.838 410.429 -0,42 Tc1xc5 Le7xc5 Lb3d5 Lc5d6 Lf4xd6 c7xd6 Dd1a4 00 Ld5xc6 b7xc6 Da4xc6 Dd8xa5 Dc6xd6 Tf8d8
15/34 01:06 27.562.088 413.882 -0,56 Tc1xc5 Le7xc5 Lb3d5 Lc5d6 Lf4xd6 c7xd6 Dd1a4 00 Te1a1 Ta8b8 b2b3 Tf8e8 Ld5xc6 b7xc6 Da4xc6

Spike 1.0a Mainz:

11 00:53 41.218.879 766.192 -1,49 Sd2f1 Dd8d7 Lb3d5 Sc6b4 Tc1xc5 Le7xc5 Ld5xb7 Ta8b8 Sf3e5 Dd7xh3 Dd1a4+ Ke8e7 Se5xg6+ f7xg6
11+ 01:01 46.894.352 767.966 -0,93 Tc1xc5 Le7xc5 Dd1c2 Lc5d6 e4e5 Ld6e7 e5e6 f7xe6 Te1xe6
11+ 01:01 46.894.352 767.778 -0,93 Tc1xc5 Le7xc5 Dd1c2 Lc5d6 e4e5 Ld6e7 e5e6 f7xe6 Te1xe6
11 01:01 47.298.725 767.911 -0,88 Tc1xc5 Le7xc5 Dd1c2 Lc5d6 e4e5 Ld6e7 e5e6 Ke8f8 e6xf7 Lg6xf7 Lb3xf7 Kf8xf7 Dc2b3+ Kf7e8 Db3xb7
11 01:04 49.504.956 768.817 -0,88 Tc1xc5 Le7xc5 Dd1c2 Lc5d6 e4e5 Ld6e7 e5e6 Ke8f8 e6xf7 Lg6xf7 Lb3xf7 Kf8xf7 Dc2b3+ Kf7e8 Db3xb7
12 01:09 53.397.164 771.947 -0,73 Tc1xc5 Le7xc5 Dd1c2 Lc5d6 e4e5 Ld6e7 e5e6 f7xe6 Te1xe6 Lg6f7 Te6xc6 Lf7xb3 Sd2xb3 b7xc6 Dc2xc6+ Ke8f8 Sb3xd4
12 01:14 57.969.588 773.732 -0,73 Tc1xc5 Le7xc5 Dd1c2 Lc5d6 e4e5 Ld6e7 e5e6 f7xe6 Te1xe6 Lg6f7 Te6xc6 Lf7xb3 Sd2xb3 b7xc6 Dc2xc6+ Ke8f8 Sb3xd4

Toga II 1.0MV.6:

11/34 00:09 8.070.653 854.444 -0,50 Lb3c4 Sc6xa5 Lf4e5 Lg6h5 b2b4 Sa5xc4 Tc1xc4 Sc5e6 Dd1c2 00 Sf3xd4 Se6xg5 Tc4xc7 Le7xb4
11/35 00:15 13.568.684 881.333 -0,34 Tc1xc5 Le7xc5 Lb3a4 Lc5d6 La4xc6+ b7xc6 Lf4xd6 Dd8xd6 Dd1c2 Ta8b8 Sd2b3 c6c5 Sb3xc5 Tb8b5 Sc5b3
12/37 00:18 16.659.551 895.556 -0,25 Tc1xc5 Le7xc5 Lb3a4 Lc5d6 La4xc6+ b7xc6 Lf4xd6 Dd8xd6 Dd1c2 c6c5 Te1c1 Ta8b8 Dc2xc5 Dd6xc5 Tc1xc5 Ke8d7 Sf3e5+ Kd7d6
13/38 00:33 30.838.115 915.758 -0,23 Tc1xc5 Le7xc5 Lb3a4 00 La4xc6 b7xc6 Sf3xh4 Lg6h7 Dd1g4 Ta8b8 Sd2c4 Tb8b3 Dg4d1 Tb3b5 Dd1g4
14/43 01:08 63.801.590 935.441 -0,25 Tc1xc5 Le7xc5 Lb3d5 Dd8d7 Dd1c2 Lc5b4 Ld5xc6 Dd7xc6 Dc2xc6+ b7xc6 Lf4xc7 Th8h5 Lc7f4 Lb4xa5 Sf3xd4 Ta8d8 Sd4xc6 La5xd2 Lf4xd2 Td8xd3


mate-in-30 schrieb:
....

Does your engine find Rxc5

r2qk2r/1pp1bpp1/p1n3b1/P1n3P1/3pPB1p/1B1P1N1P/1P1N1P2/2RQR1K1 w kq - 0
1

FEN: r2qk2r/1pp1bpp1/p1n3b1/P1n3P1/3pPB1p/1B1P1N1P/1P1N1P2/2RQR1K1 w kq
- 0 1

FEN: r2qk2r/1pp1bpp1/p1n3b1/P1n3P1/3pPB1p/1B1P1N1P/1P1N1P2/2RQR1K1 w kq
- 0 1

Rybka 1.01 Beta 11:
3 00:00 1.304 0 -0.09 1.Ne5 Bh5 2.Qc2 0-0 3.g6 Nxe5 4.Bxe5
Bxg6
4 00:00 1.304 0 -0.29 1.Ne5 Bh5 2.Qc2 0-0 3.g6 Nxe5 4.Bxe5
Bxg6
5 00:00 2.440 0 -0.29 1.Ne5 Bh5 2.Qc2 0-0 3.g6 Nxe5 4.Bxe5
Bxg6
6 00:00 4.304 0 -0.74 1.Ne5 Bh5 2.Qc2 0-0 3.g6 Nxe5 4.Bxe5
Bxg6
6 00:00 6.672 0 -0.36 1.Nc4 Bh5 2.Bc2 Ne6
6 00:00 7.400 0 -0.32 1.Rxc5 Bxc5 2.Ba4 0-0 3.Bxc6 bxc6
4.Nxh4 Bh7
6 00:00 8.309 60.343 -0.22 1.Nf1 Bh5 2.N1h2 Ne6
7 00:00 14.875 69.552 -0.35 1.Nf1 Bh5 2.Bd5 Ne6
7 00:00 15.595 67.954 -0.27 1.Rxc5 Bxc5 2.Ba4 0-0 3.Bxc6 bxc6
4.Nxh4 Bh7
8 00:00 17.059 69.595 -0.27 1.Rxc5 Bxc5 2.Ba4 0-0 3.Bxc6 bxc6
4.Nxh4 Bh7
9 00:00 24.169 75.225 -0.30 1.Rxc5 Bxc5 2.Ba4 0-0 3.Bxc6 bxc6
4.Nxh4 Bh7
10 00:00 60.655 84.504 -0.33 1.Rxc5 Bxc5 2.Ba4 0-0 3.Bxc6 bxc6
4.Nxh4 Bh7
10 00:01 100.424 101.214 -0.30 1.Qe2 Nxb3 2.Nxb3 Bh5 3.Nc5 Qc8
4.Kh2 0-0
11 00:02 195.693 93.596 -0.34 1.Qe2 Nxb3 2.Nxb3 Bh5 3.Nc5 Qc8
4.Kh2 0-0 5.Rc2
11 00:03 293.449 90.700 -0.33 1.Ne5 Bh5 2.Qc2 0-0 3.g6 Nxe5
4.Bxe5 Bxg6 5.Nf3
12 00:07 605.108 82.266 -0.34 1.Ne5 Bh5 2.Qc2 0-0 3.g6 Nxe5
4.Bxe5 Bxg6 5.Nf3 Qd7
13 00:39 2.728.151 70.334 -0.54 1.Ne5 Nxe5 2.Bxe5 Qd7 3.Bc4 Bh5
4.Qc2 Qxh3 5.b4 Ne6 6.Bxe6
13 00:58 4.175.412 73.479 -0.43 1.Rxc5 Bxc5 2.Qc2 Bb4 3.Ba4 0-0
4.Qc4 Bd6 5.e5 Nxa5
14 01:25 6.273.565 75.163 -0.38 1.Rxc5 Bxc5 2.Qc2 Bb4 3.Ba4 0-0
4.Qc4 Bd6 5.e5 Nxa5 6.Qxd4
15 02:28 11.280.250 77.547 -0.44 1.Rxc5 Bxc5 2.Ba4 0-0 3.Qc1 Bb4
4.Bxc6 bxc6 5.Qxc6 Rb8 6.Rb1 Bh5 7.Nxh4 Bd6


A Rybka Devotee

mate-in-30 wrote:

Does your engine find Rxc5

FEN: r2qk2r/1pp1bpp1/p1n3b1/P1n3P1/3pPB1p/1B1P1N1P/1P1N1P2/2RQR1K1 w kq
15 02:28 11.280.250 77.547 -0.44 1.Rxc5 Bxc5 2.Ba4 0-0 3.Qc1 Bb4
4.Bxc6 bxc6 5.Qxc6 Rb8 6.Rb1 Bh5 7.Nxh4 Bd6

This doesn't look convincing. Following this line it is obvious that
White is very bad. After 7...Bd6 8. Bxd6 (8. Bg3 Bxg3 9. fxg3 Qxg5)
8...Qxg5+ 9. Bg3 Qxd2 10. Qxa6 Be2 Shredder evaluates this as -2.93 for
White.

The idea of the sacrifice exchange is to install a knight at c4 which
covers all white weaknesses on the queenside while White has some play
on the kingside. Example 1. Rxc5 Bxc5 2. Ba4 0-0 3. Bxc6 bxc6 4. Nxh4
Bh7 5. Nc4 Bd6 6. Qg4. But if Black is careful it doesn't seem to work.
4...Bb4! 5. Nxg6 fxg6 6. Qb3+ (else sooner or later Black eliminates
the knight refuting the white strategy) 6...Kh7 7. Qxb4 Rxf4 and White
has a severe problem with g5 (8. Qc5 Rb8 plan Rb5).

After 4. Nc4 Bh5 White is stuck on the kingside and also has the problem
with g5.

To me the invitation 1. Ne5 Nxe5 2. Bxe5 Nxd3 3. Bxg7 Rh5 4. Ba4+ c6 5.
Rxc6 looks much more interesting. But Black can deny the sacrifice with
1...Bh5 2. Nxc6 bxc6 3. Qc2 0-0 and should be better.

Therefore White better settles for 1. Bc4. For example 1...Qd7 2. Kh2
Bh5 3. Qc2 with perhaps a small advantage for Black or 1...Nxa5 2. Qc2
or 2. Be5.

Claus-Juergen

It looks to me that chess engines are pretty much only doing simple
calculations and not doing very much positional evaluations

I have had good fun playing different chess engines against each other
or two instances of the same chess engine with different options

The real difference is only in how deep one engine is allowed to look
ahead and it is an enourmous time difference for various depths

It is a bit boring to play the beginnings because they are basically by
the book and the endings are often predicatble too

It is interesting to play one chess engine with depth 12 and another on
depth 16
It may take quite a lot of careful moves by both but usually the one
playing at depth 16 will make a good move and the otherone at depth 12
will not do the best defence
Worst thing is how long time this process takes

wrote:

It is interesting to play one chess engine with depth 12 and another on
depth 16

I was under the impression that games between engines are not
subject to a fixed ply depth search. Instead, their search ply
depth (horizon) varies from position to position during a game.

It may take quite a lot of careful moves by both but usually the one
playing at depth 16 will make a good move and the otherone at depth 12
will not do the best defence

Well, yes, hidden tactical resources are layered... 8)

Worst thing is how long time this process takes

There is no free lunch when it comes to investigating
ever deeper layers of tactics. Tal, at least, could
rest once his OTB struggles were over. The "poor"
machines keep on going and going! 8)

Regards,

Major Cat

I was under the impression that games between engines are not
subject to a fixed ply depth search. Instead, their search ply
depth (horizon) varies from position to position during a game.

It depends on the engine and some of them at least allow you to set
fixed

"Fixed Depth: The computer will look ahead the specified number of
half-moves (one move by one side). The smaller the depth number, the
faster the search will complete (a search to depth 1 will take only a
fraction of a second). If the Fixed Depth option is selected, no limit
is set on how long you have to move when it is your turn."

I mostly use Arasan 8.4

It is free and very good

I used to play Arasan 2.1 and it was easy to beat
Arasan 8.4 is quite good
Most fun to let two instances play and try out different moves on the
12 depth one while the other depth 16 is calculating

depth 10 or 12 is ok depth 16 and higher is a bit too much to enjoy for
an afternoon
It may take a few days by going away inbetween

I find it more interesting no having them at the same level

It is also fun to play different engines against each other

At least let them play the first book moves

It is also good to have engines theat does not have book and you can
get more interesting beginnings

The first chess game I played against a computer - 34 years ago - I was
pretty convinced the computer would never be any good at playing chess

Now I see it only a matter of time

The chess engines are pretty slow on great depths but they keep getting
better and the computer faster