gold fishes

lech · Post by **lech** » Mon Mar 08, 2010 9:34 am

I would like to show some examples (two pairs) how engines can analyze the same position after exchanging of colors.
Conditions for all the tries were same.

[d] 4kr1r/1R6/8/8/8/2K5/3R4/8 w k - 0 1

Code: Select all

Analysis by Rybka 2.2n2 mp 32x:

1.Rd3 
  =  (0.19)   Depth: 2   00:00:00
1.Rd3 
  =  (0.22)   Depth: 3   00:00:00
1.Rd3 
  =  (0.14)   Depth: 4   00:00:00
1.Kb2 
  =  (0.18)   Depth: 4   00:00:00
1.Kb2 Rhg8 
  =  (0.18)   Depth: 5   00:00:00
1.Kb2 Rhg8 2.Ka2 
  =  (0.19)   Depth: 6   00:00:00  24kN
1.Kb2 Rhg8 2.Ka2 Rf4 
  =  (0.18)   Depth: 7   00:00:00  32kN
1.Kb2 Rhg8 2.Ka2 Rf4 3.Rc2 
  =  (0.18)   Depth: 8   00:00:00  47kN
1.Kb2 Rhg8 2.Ka2 Rf4 3.Re2+ Kf8 4.Rc2 
  =  (0.16)   Depth: 9   00:00:00  82kN
1.Kb2 Rhg8 2.Ka2 Rf4 3.Re2+ Kf8 4.Rc2 Ra4+ 5.Kb2 
  =  (0.12)   Depth: 10   00:00:03  266kN
1.Kb2 Rhg8 2.Re2+ 
  =  (0.13)   Depth: 11   00:00:06  541kN
1.Kb2 Rhg8 2.Re2+ 
  =  (0.12)   Depth: 12   00:00:08  761kN
1.Kb2 Rhg8 2.Re2+ 
  =  (0.10)   Depth: 13   00:00:18  1682kN
1.Kc2 Rhg8 2.Kb2 Rh8 3.Ka2 Rfg8 4.Ra7 Rh5 5.Rb2 Ra5+ 6.Rxa5 
  +-  (5.28)   Depth: 13   00:00:38  3397kN

[d] 8/3r4/2k5/8/8/8/1r6/4KR1R b K - 0 1

Code: Select all

Analysis by Rybka 2.2n2 mp 32x:

1...Rd6 
  =  (-0.20)   Depth: 2   00:00:00
1...Rd6 
  =  (-0.23)   Depth: 3   00:00:00
1...Rd6 
  =  (-0.19)   Depth: 4   00:00:00
1...Rd6 2.Rhg1 
  =  (-0.14)   Depth: 5   00:00:00
1...Kc7 2.Rhg1 
  =  (-0.20)   Depth: 5   00:00:00
1...Kc7 2.Rhg1 Kb7 
  =  (-0.15)   Depth: 6   00:00:00  24kN
1...Kc7 2.Rhg1 Kb7 3.Rh1 
  =  (-0.18)   Depth: 7   00:00:00  28kN
1...Kc7 2.Rhg1 Kb7 3.Rh1 Rc7 
  =  (-0.17)   Depth: 8   00:00:00  34kN
1...Kc7 2.Rhg1 Kb7 3.Rh1 Rc7 
  =  (-0.15)   Depth: 9   00:00:01  54kN
1...Kc7 2.Rhg1 Kb7 3.Rh1 Ra2 4.Rhg1 Ka7 
  -+  (-5.09)   Depth: 10   00:00:02  92kN

The next pair shows differences in quality of variants (terminated after 10 min.).

Searching: [d] br3r2/2q2ppk/p2pp3/2n1b1BP/1n2P3/1NN2P2/1PPQB3/1K4RR b - -
by Stockfish 1.6.3 JA 32x

Code: Select all

 2     -0.24   00:01      582 Kg8 Nd4 
 3     -1.90   00:01     1541 Kg8 h6 Nxb3 h7+ Kh8 cxb3 
 3     -1.21   00:01     2052 Nxc2 Nxc5 Na3+ Ka1 Qxc5 Bxa6 
 4     -1.41   00:01     3524 Nxc2 Nxc5 Na3+ Ka1 Qxc5 Be7 
 4     -0.93   00:01     4820 Rfc8 Nxc5 Qxc5 h6 Bxc3 bxc3 Qxc3 hxg7+ Kg8 Qxc3 
                              Rxc3 
 5     -0.93   00:01     8089 Rfc8 Nxc5 Qxc5 h6 Bxc3 hxg7+ Kg8 bxc3 Qxc3 Qxc3 
                              Rxc3 
 6     -0.93   00:01    16936 Rfc8 Nxc5 Qxc5 h6 Bxc3 hxg7+ Kg8 Qxc3 Qxc3 bxc3 
                              Rxc3 
 7  <  -1.13   00:01    26504 Rfc8 h6 Nxb3 hxg7+ Kg8 Rh8+ Kxg7 Be7+ 
 8     -0.40   00:01    70750 Rfc8 h6 g6 Nd4 Na4 Nxa4 Bxd4 c4 Bxg1 Rxg1 
 9     -0.44   00:02   194477 Rfc8 h6 g6 Rc1 f6 Bf4 Nbd3 Bxd3 Nxd3 cxd3 Rxb3 d4 
                              Bxf4 Qxf4 
10     -0.44   00:04   495393 Rfc8 Be3 Nxb3 cxb3 Bxc3 bxc3 Qxc3 Qxc3 Rxc3 Rxg7+ 
                              Kh8 Bd4 Rxb3+ Kc1 Rc8+ Kd2 Rc2+ Kd1 
11  >  -0.24   00:05   723512 Rfc8 Be3 Nxb3 cxb3 Bxc3 bxc3 Qxc3 Qxc3 Rxc3 Rxg7+ 
                              Kh8 Bd4 Rxb3+ Kc1 Rc8+ Kd2 Rc2+ Kd1 Rb1# 
12  >  +0.57   00:10    1737k Rfc8 Be3 Nxb3 cxb3 Bxc3 bxc3 Qxc3 Qxc3 Rxc3 Rxg7+ 
                              Kh8 Bd4 Rxb3+ Kc1 Rc8+ Kd2 Rc2+ Kd1 Rb1# 
13     +0.57   00:21    4286k Rfc8 Bf4 Nxb3 cxb3 Bxc3 bxc3 Qxc3 Qxc3 Rxc3 Bd1 
                              e5 h6 g6 Bd2 Rd3 Rg2 
14     +0.65   00:44    9323k Rfc8 Bf4 Nxb3 cxb3 Bxc3 bxc3 Qxc3 Qxc3 Rxc3 Bd1 
                              Rd3 Rh4 f5 Bc1 a5 exf5 exf5 Bb2 Bxf3 Rxg7+ Kh6 
                              Rg6+ Kh7 
15     +1.01   01:27   19255k Rfc8 Bf4 Nxb3 cxb3 Bxc3 bxc3 Qxc3 Qxc3 Rxc3 Bd1 
                              Rd3 Rh2 e5 Bd2 d5 exd5 Bxd5 Rhg2 Kh8 Kc1 f5 Bxb4 
                              Rxb4 Rxg7 Bxf3 Bxf3 Rxf3 
16     +0.85   02:58   38910k Rfc8 Bf4 Nxb3 cxb3 Bxc3 bxc3 Qxc3 Qxc3 Rxc3 Bd1 
                              Rd3 Rh2 e5 Bd2 d5 exd5 Bxd5 Bxb4 Rxb4 Bc2 Rxb3+ 
                              Bxb3 Rxb3+ Kc2 Rxf3 Rhg2 Kh6 Rxg7 e4 R7g5 f5 Kd2 
                              Rd3+ Ke2 
17     +1.21   08:40  113598k Rfc8 Rc1 Nxb3 cxb3 Qa5 Na4 Rxc1+ Rxc1 Nc6 Ka2 
                              Qxd2 Bxd2 Nd4 Bd1 f5 f4 Bf6 exf5 Nxf5 Be2 Kh6 Bc4 
                              d5

Searching: [d] 1k4rr/1ppqb3/1nn2p2/1N2p3/2N1B1bp/P2PP3/2Q2PPK/BR3R2 w - -
by Stockfish 1.6.3 JA 32x

Code: Select all

 2     -0.24   00:00      592 Kg1 Nd5 
 3     -1.94   00:00     1585 Kg1 h3 Nxb6 h2+ Kh1 cxb6 
 3     +0.16   00:00     2173 Nxb6 cxb6 Kg1 Bh5 
 4     -0.97   00:00     3807 Nxb6 cxb6 Kg1 h3 Rfc1 h2+ Kh1 
 5     -0.44   00:00     5582 Nxb6 cxb6 f3 Bh5 Kh1 Bc5 
 6     -1.54   00:00    14126 Nxb6 cxb6 f3 h3 g3 Be6 Rfc1 
 6     -1.37   00:00    24232 Nxc7 Nxc4 Na6+ Ka8 Qxc4 h3 Kg1 h2+ Kh1 Bxa3 
 7     -0.77   00:00    85416 Nxc7 h3 Na6+ Ka7 Kg1 Nxc4 Qxc4 h2+ Kh1 Ka8 
 8     +0.24   00:01   213756 Nxc7 Nxc4 Na6+ Kc8 Qxc4 Be6 Bxc6 Qxc6 Qxc6+ bxc6 
                              Rb8+ Kd7 Rb7+ Kd6 Bc3 
 9     +0.36   00:01   274777 Nxc7 Nxc4 Na6+ Kc8 Qxc4 Be6 Bxc6 Qxc6 Qxc6+ bxc6 
                              Rb8+ Kd7 Rb7+ Kd6 Bc3 h3 
10     +0.36   00:01   343040 Nxc7 Nxc4 Na6+ Kc8 Qxc4 Be6 Bxc6 Qxc6 Qxc6+ bxc6 
                              Rb8+ Kd7 Rb7+ Kd6 Bc3 h3 
11  >  +0.57   00:02   563631 Nxc7 h3 g3 Nxc4 Na6+ Ka8 Qxc4 Bxa3 Qa4 
12     +0.73   00:05    1155k Nxc7 Nxc4 Na6+ Kc8 Qxc4 Be6 Bxc6 Qxc6 Qxc6+ bxc6 
                              Rb8+ Kd7 Rb7+ Ke8 Nb4 h3 g3 Kf7 Nxc6 
13  >  +1.21   00:20    4442k Nxc7 Nxc4 Na6+ Kc8 Qxc4 Be6 Qb5 Bxa3 Qb6 h3 g3 
                              Rg7 Bxc6 Qxc6 Qxc6+ bxc6 Rb8+ 
14     +1.09   00:43    9578k Nxc7 Nxc4 Na6+ Ka7 Qxc4 h3 g3 Rc8 Rfc1 Nb4 Nc7 
                              Bd6 Qb5 Rxc7 Qxd7 Rxd7 axb4 Kb6 f4 
15     +1.58   01:06   14643k Nxc7 Nxc4 Na6+ Ka7 Qxc4 h3 g3 Rc8 Rfc1 Na5 Nc7 
                              Kb8 Qa6 Rxc7 Qxa5 Rxc1 Rxc1 Rc8 Rb1 Rc5 Qb6 Rc7 
                              d4 
16     +1.58   02:09   29102k Nxc7 Nxc4 Na6+ Ka7 Qxc4 Rc8 Rfc1 Nb4 Nc7 Kb8 axb4 
                              Rxc7 Qxc7+ Qxc7 Rxc7 Kxc7 d4 f5 Rc1+ Kb6 Bd5 Rd8 
                              Be6 Ra8 dxe5 Bxb4 
17     +1.94   04:19   58726k Nxc7 Nxc4 Na6+ Ka7 Qxc4 Rc8 Nc5 Bxc5 Qxc5+ Ka8 f4 
                              h3 g3 f5 Bd5 Rhd8 Qb5 Rc7 e4 fxe4 dxe4 exf4 Qa4+ 
                              Kb8 gxf4

The second pair is taken from the following game.

[Event "Linares 22nd"]
[Site "Linares"]
[Date "2005.03.08"]
[Round "12"]
[White "Adams, Michael"]
[Black "Kasparov, Garry"]
[Result "0-1"]
[ECO "B84"]
[WhiteElo "2741"]
[BlackElo "2804"]
[PlyCount "52"]
[EventDate "2005.02.23"]
[EventType "tourn"]
[EventRounds "14"]
[EventCountry "ESP"]
[EventCategory "20"]
[Source "ChessBase"]
[SourceDate "2005.06.06"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 e6 7. Be2 Qc7 8. Qd2
b5 9. a3 Bb7 10. f3 Nc6 11. O-O-O b4 12. axb4 Nxb4 13. g4 Be7 14. g5 Nd7 15. h4
Nc5 16. Kb1 Rb8 17. h5 O-O 18. g6 Bf6 19. Rdg1 Ba8 20. Bg5 Be5 21. gxh7+ Kxh7
22. Nb3 Nxc2 23. Nxc5 Na3+ 24. Ka2 Qxc5 25. Na4 Nc2 26. Kb1 Qa3 0-1