nice exchange sac from Rybka 4

Discussion of anything and everything relating to chess playing software and machines.

Moderators: hgm, Rebel, chrisw

jdart
Posts: 4367
Joined: Fri Mar 10, 2006 5:23 am
Location: http://www.arasanchess.org

nice exchange sac from Rybka 4

Post by jdart »

From this tourney:

http://talkchess.com/forum/viewtopic.ph ... 26&t=35202, in the game Deep Saros 0.9-Deep Rybka 4:

[D] 8/5p2/p4r2/1p2b1pp/P3P2k/2P2B1P/KP1R2P1/8 b - -

bm Rxf3
Top
Robert Flesher
Posts: 1280
Joined: Tue Aug 18, 2009 3:06 am

Re: nice exchange sac from Rybka 4

Post by Robert Flesher »

jdart wrote:From this tourney:

http://talkchess.com/forum/viewtopic.ph ... 26&t=35202, in the game Deep Saros 0.9-Deep Rybka 4:

[D] 8/5p2/p4r2/1p2b1pp/P3P2k/2P2B1P/KP1R2P1/8 b - -

bm Rxf3
Great! A move a strong human would play almost without calculation. The bishop and connect passers are going to be strong!
Top
zullil
Posts: 6442
Joined: Tue Jan 09, 2007 12:31 am
Location: PA USA
Full name: Louis Zulli

Re: nice exchange sac from Rybka 4

Post by zullil »

jdart wrote:From this tourney:

http://talkchess.com/forum/viewtopic.ph ... 26&t=35202, in the game Deep Saros 0.9-Deep Rybka 4:

[D] 8/5p2/p4r2/1p2b1pp/P3P2k/2P2B1P/KP1R2P1/8 b - -

bm Rxf3
Stockfish-1.7.1 (8 threads) finds this in about 10 seconds:

Code: Select all

Searching: 8/5p2/p4r2/1p2b1pp/P3P2k/2P2B1P/KP1R2P1/8 b - -
infinite: 1 ponder: 0 time: 0 increment: 0 moves to go: 0
 2     -0.40   00:01      522 bxa4 Rd5 
 3     -0.40   00:01      852 bxa4 Bd1 Rf4 
 4     -0.44   00:01     1170 bxa4 Bd1 Rf4 Bf3 
 5     -0.24   00:01     2173 bxa4 Bd1 Rf4 Rd7 Rxe4 Rxf7 
 6     -0.24   00:01     4068 bxa4 Bd1 Rf4 Rd7 Rxe4 Rxf7 
 7  <  -0.36   00&#58;01     5035 bxa4 Bd1 Rf4 Rd5 Rxe4 Bf3 
 7  <  -0.48   00&#58;01     8604 bxa4 Rd5 Re6 Be2 Bg3 Rd4 
 7     -0.53   00&#58;01    17683 bxa4 Rd5 Re6 Bd1 Bf4 Rd4 g4 hxg4 hxg4 Bxa4 
 8     -0.32   00&#58;01    28041 bxa4 Rd5 Re6 Bd1 g4 hxg4 hxg4 Ra5 Kg5 Bxa4 
 9     -0.36   00&#58;01    34706 bxa4 Rd5 Re6 Bd1 g4 hxg4 hxg4 Ra5 Kg3 Rxa4 Rb6 
10     -0.36   00&#58;01    46143 bxa4 Rd5 Re6 Bd1 g4 hxg4 hxg4 Ra5 Kg3 Rxa4 Rb6 
11  <  -0.44   00&#58;01    79862 bxa4 Rd5 Bf4 c4 g4 Bd1 Re6 c5 Rxe4 c6 
11  <  -0.53   00&#58;01   109941 bxa4 Rd5 Re6 Ra5 g4 Be2 gxh3 gxh3 Kxh3 Bxh5 
11  >  -0.28   00&#58;01   156610 bxa4 Rd5 Re6 Ra5 g4 Be2 Kg3 hxg4 hxg4 Rxa4 Rb6 
11     -0.28   00&#58;01   184819 bxa4 Rd5 Re6 Bd1 Re7 Ra5 Kg3 Bxh5 Kxg2 Bg4 Bf4 
                              Rxa4 
12  <  -0.36   00&#58;01   208024 bxa4 Rd5 Re6 Bd1 Re7 Ra5 Kg3 Bxh5 Kxg2 Bg4 Bf4 
                              Rxa4 
12     -0.40   00&#58;01   283523 bxa4 Ka3 g4 hxg4 hxg4 Bd1 Rf4 Bc2 Kg3 Kxa4 Rf2 
                              Rxf2 Kxf2 Bd1 Ke3 Bxg4 Kxe4 
13     -0.40   00&#58;01   460144 bxa4 Rd5 Re6 Ka3 g4 Bd1 Bf4 Kxa4 Rxe4+ Ka5 Re5 
                              Rxe5 Bxe5 hxg4 hxg4 Kxa6 
14  >  -0.32   00&#58;01   662040 bxa4 Bd1 Bf4 Rd3 Re6 Rd4 Rh6 Bxa4 Kg3 
14     -0.36   00&#58;01   771815 bxa4 Rd5 Re6 Bd1 Bf4 Rd4 Rh6 Rxa4 Kg3 Bf3 g4 hxg4 
                              hxg4 Bd1 Kxg2 Bxg4 
15  >  -0.28   00&#58;01    1316k bxa4 Bd1 Bf4 Rd3 Re6 Rd4 Rh6 Rxa4 Kg3 Bf3 g4 hxg4 
                              hxg4 Bd1 Rh4 
15  <  -0.44   00&#58;01    1747k bxa4 Rd5 Re6 Ra5 g4 hxg4 hxg4 Be2 Kg3 Bxa6 Kxg2 
                              Bc8 
15     -0.40   00&#58;01    2075k bxa4 Rd5 Bb8 e5 Rf4 Ra5 g4 hxg4 hxg4 Bb7 Kg3 Ka3 
                              Bc7 Rxa6 Bxe5 Rxa4 Rxa4+ Kxa4 
16  <  -0.48   00&#58;01    2351k bxa4 Rd5 Bc7 e5 Rf5 Rd4+ Rf4 Rxf4+ gxf4 Ka3 
16     -0.48   00&#58;01    2642k bxa4 Rd5 Bb8 e5 Rf4 Ra5 g4 hxg4 hxg4 Bb7 Kg3 Ka3 
                              Bc7 Rxa6 Bxe5 Rxa4 Rxa4+ Kxa4 f5 Bd5 Kf4 
17     -0.44   00&#58;01    3051k bxa4 Rd5 Bb8 e5 Rf4 Ra5 g4 hxg4 hxg4 Bb7 Bc7 Rxa6 
                              Bxe5 Ka3 Kg5 Bd5 Rf2 Rxa4 Rd2 Bc6 
18  <  -0.53   00&#58;01    3511k bxa4 Rd5 Bc7 e5 Rf4 Rc5 Bb8 Ra5 g4 hxg4 hxg4 Bb7 
                              Bc7 Rxa6 Bxe5 Ka3 Kg5 Rxa4 Rxa4+ Kxa4 
18  >  -0.36   00&#58;02    7049k bxa4 Ka3 Rxf3 gxf3 Kxh3 Kxa4 Kg3 Rd5 Bf4 Rd3 h4 
                              Kb3 h3 
18  >  -0.28   00&#58;02    7753k bxa4 Bd1 Rd6 Rxd6 Bxd6 Bxa4 Kg3 Bd1 Kxg2 Bxh5 
                              Kxh3 Bxf7 Kg3 
18     -0.20   00&#58;02   10972k bxa4 Rd5 Re6 Ra5 f6 Kb1 Rd6 Kc2 Bf4 Rd5 Be5 Rxd6 
                              Bxd6 Kd3 a3 bxa3 Bxa3 c4 g4 hxg4 hxg4 
19     -0.32   00&#58;03   12991k bxa4 Rd5 Re6 Ra5 f6 Kb1 g4 hxg4 hxg4 Be2 a3 Rxa6 
                              Rxa6 Bxa6 axb2 Kxb2 Kg3 Bc8 Kf4 Bf5 Ke3 Kc2 
20     -0.28   00&#58;03   17644k bxa4 Rd5 Re6 Ra5 f6 Kb1 g4 hxg4 hxg4 Be2 a3 Rxa6 
                              Rxa6 Bxa6 axb2 Kxb2 Kg3 Bc8 Kf4 Bf5 Ke3 Bxg4 Kxe4 
                              Kb3 f5 Bf3+ Ke3 Kc2 
21  >  -0.16   00&#58;04   22920k bxa4 Ka3 Bf4 Rd5 g4 Bd1 Bc1 hxg4 hxg4 Bxa4 Rf2 
21     -0.16   00&#58;05   30237k bxa4 Rd5 Re6 Ka3 g4 hxg4 hxg4 Bd1 Bf6 Rd7 Rxe4 
                              Rxf7 Be7+ Ka2 Bc5 Rh7+ Kg3 Rg7 Kh4 Rc7 Bg1 Rd7 
                              Bc5 Rd5 Bb6 Rd7 
22     -0.08   00&#58;07   45645k bxa4 Rd5 Re6 Ka3 g4 hxg4 hxg4 Bd1 Bf4 Rd4 Rg6 e5 
                              Bxe5 Rxa4 Kg3 Bc2 Rb6 Bf5 Bf4 Ka2 Rf6 Be4 Be3 Bd5 
23  <  -0.24   00&#58;08   55278k bxa4 Rd5 Re6 Ka3 g4 hxg4 hxg4 Bd1 Bf4 Rd4 Rg6 Rd3 
                              Re6 Bxa4 Rxe4 Bc6 Re2 b4 Kg5 c4 Kf5 Rd4 
23  >  +0.08   00&#58;09   63819k Rxf3 gxf3 Kxh3 Ka3 bxa4 Rd7 Kg3 Rxf7 h4 Rf5 Bf4 
                              e5 h3 e6 h2 
23  >  +0.24   00&#58;10   69047k Rxf3 gxf3 Kxh3 axb5 axb5 Rd1 g4 fxg4 hxg4 Rh1+ 
                              Kg2 Rh5 f6 Kb3 g3 Kc2 Kf3 
23  >  +0.57   00&#58;11   77595k Rxf3 gxf3 Kxh3 a5 Kg3 Rd3 h4 Kb3 Bf4 Kc2 h3 
23  >  +1.21   00&#58;12   93283k Rxf3 gxf3 Kxh3 a5 Kg3 Rd3 h4 Kb3 Bf4 Rd7 Kxf3 e5 
                              h3 Rxf7 h2 
23     +1.49   00&#58;21  171745k Rxf3 gxf3 Kxh3 b4 h4 a5 Bxc3 Rd6 Kg2 Rxa6 h3 Kb3 
                              Bg7 Rd6 h2 Rd2+ Kg3 Rxh2 Kxh2 Kc2 Bd4 Kd3 Ba7 e5 
                              Kg3 Ke4 Kg2 a6 Kg3 e6 fxe6 

Nodes&#58; 242785142
Nodes/second&#58; 8358355
Best move&#58; Rxf3
Ponder move&#58; gxf3
Top
zullil
Posts: 6442
Joined: Tue Jan 09, 2007 12:31 am
Location: PA USA
Full name: Louis Zulli

Re: nice exchange sac from Rybka 4

Post by zullil »

jdart wrote:From this tourney:

http://talkchess.com/forum/viewtopic.ph ... 26&t=35202, in the game Deep Saros 0.9-Deep Rybka 4:

[D] 8/5p2/p4r2/1p2b1pp/P3P2k/2P2B1P/KP1R2P1/8 b - -

bm Rxf3
Spark-0.4 (8 threads) first sees in about 6 seconds:

Code: Select all

info depth 23 seldepth 33 score cp 10 time 6304 nodes 95679466 nps 15177580 hashfull 147 pv f6f3
Top
zullil
Posts: 6442
Joined: Tue Jan 09, 2007 12:31 am
Location: PA USA
Full name: Louis Zulli

Re: nice exchange sac from Rybka 4

Post by zullil »

jdart wrote:From this tourney:

http://talkchess.com/forum/viewtopic.ph ... 26&t=35202, in the game Deep Saros 0.9-Deep Rybka 4:

[D] 8/5p2/p4r2/1p2b1pp/P3P2k/2P2B1P/KP1R2P1/8 b - -

bm Rxf3
Crafty takes about a minute and a half:

Code: Select all

Crafty v23.2 &#40;8 cpus&#41;

White&#40;1&#41;&#58; setboard 8/5p2/p4r2/1p2b1pp/P3P2k/2P2B1P/KP1R2P1/8 b - -
Black&#40;1&#41;&#58; st 180
search time set to 180.00.
Black&#40;1&#41;&#58; display stats
display statistics at end of each search.
Black&#40;1&#41;&#58; display

       +---+---+---+---+---+---+---+---+
    8  |   | . |   | . |   | . |   | . |
       +---+---+---+---+---+---+---+---+
    7  | . |   | . |   | . |<P>| . |   |
       +---+---+---+---+---+---+---+---+
    6  |<P>| . |   | . |   |<R>|   | . |
       +---+---+---+---+---+---+---+---+
    5  | . |<P>| . |   |<B>|   |<P>|<P>|
       +---+---+---+---+---+---+---+---+
    4  |-P-| . |   | . |-P-| . |   |<K>|
       +---+---+---+---+---+---+---+---+
    3  | . |   |-P-|   | . |-B-| . |-P-|
       +---+---+---+---+---+---+---+---+
    2  |-K-|-P-|   |-R-|   | . |-P-| . |
       +---+---+---+---+---+---+---+---+
    1  | . |   | . |   | . |   | . |   |
       +---+---+---+---+---+---+---+---+
         a   b   c   d   e   f   g   h

Black&#40;1&#41;&#58; go
              time limit 3&#58;00 (+0.00&#41; &#40;3&#58;00&#41;
              depth   time  score   variation &#40;1&#41;
starting thread 1
starting thread 2
starting thread 3
starting thread 4
starting thread 5
starting thread 6
starting thread 7
               11     0.05   0.42   1. ... bxa4 2. Ka3 g4 3. hxg4 hxg4
                                    4. Bd1 Kg5 5. Bxa4 Kf4 6. Bd7 Rd6 7.
                                    Rf2+ Kxe4 8. Rxf7
               11->   0.05   0.42   1. ... bxa4 2. Ka3 g4 3. hxg4 hxg4   
                                    4. Bd1 Kg5 5. Bxa4 Kf4 6. Bd7 Rd6 7.
                                    Rf2+ Kxe4 8. Rxf7
               12     0.08   0.47   1. ... bxa4 2. Ka3 g4 3. hxg4 hxg4   
                                    4. Bd1 Kg5 5. Kxa4 Rd6 6. Rxd6 Bxd6
                                    7. c4 <HT>
               12->   0.09   0.47   1. ... bxa4 2. Ka3 g4 3. hxg4 hxg4    
                                    4. Bd1 Kg5 5. Kxa4 Rd6 6. Rxd6 Bxd6
                                    7. c4 <HT>
               13     0.13   0.40   1. ... bxa4 2. Ka3 g4 3. hxg4 hxg4    
                                    4. Bd1 Rf4 5. Bc2 Kg3 6. Kxa4 Rf2 7.
                                    Rxf2 Kxf2
               13->   0.14   0.40   1. ... bxa4 2. Ka3 g4 3. hxg4 hxg4    
                                    4. Bd1 Rf4 5. Bc2 Kg3 6. Kxa4 Rf2 7.
                                    Rxf2 Kxf2
               14     0.22   0.36   1. ... bxa4 2. Ka3 g4 3. hxg4 hxg4    
                                    4. Bd1 Rf4 5. Re2 Kg3 6. Bxa4 Rf2 7.
                                    Rxf2 Kxf2 8. Bd7
               14->   0.24   0.36   1. ... bxa4 2. Ka3 g4 3. hxg4 hxg4    
                                    4. Bd1 Rf4 5. Re2 Kg3 6. Bxa4 Rf2 7.
                                    Rxf2 Kxf2 8. Bd7
               15     0.39   0.31   1. ... bxa4 2. Ka3 g4 3. hxg4 hxg4    
                                    4. Bd1 Rf4 5. Re2 Kg3 6. Kxa4 f5 7.
                                    Bc2 Rf2 8. Rxf2 Kxf2 9. exf5 Kxg2
               15->   0.44   0.31   1. ... bxa4 2. Ka3 g4 3. hxg4 hxg4    
                                    4. Bd1 Rf4 5. Re2 Kg3 6. Kxa4 f5 7.
                                    Bc2 Rf2 8. Rxf2 Kxf2 9. exf5 Kxg2
               16     0.74   0.31   1. ... bxa4 2. Ka3 g4 3. hxg4 hxg4    
                                    4. Bd1 Rf4 5. Re2 Kg3 6. Kxa4 f5 7.
                                    Bc2 Rf2 8. Rxf2 Kxf2 9. exf5 Kxg2
               16->   0.87   0.31   1. ... bxa4 2. Ka3 g4 3. hxg4 hxg4    
                                    4. Bd1 Rf4 5. Re2 Kg3 6. Kxa4 f5 7.
                                    Bc2 Rf2 8. Rxf2 Kxf2 9. exf5 Kxg2
               17     6.53   0.39   1. ... bxa4 2. Rd5 Bb8 3. e5 Rf4 4.   
                                    Be2 Re4 5. Rd4 Rf4 6. Rxf4+ gxf4 7.
                                    Bf3 Bxe5 8. Ka3 Kg3 9. Kxa4 f6 10.
                                    Kb4
               17->   6.99   0.39   1. ... bxa4 2. Rd5 Bb8 3. e5 Rf4 4.   
                                    Be2 Re4 5. Rd4 Rf4 6. Rxf4+ gxf4 7.
                                    Bf3 Bxe5 8. Ka3 Kg3 9. Kxa4 f6 10.
                                    Kb4
               18     7.73   0.41   1. ... bxa4 2. Rd5 Bb8 3. e5 Rf4 4.   
                                    Be2 g4 5. hxg4 hxg4 6. Bxa6 Rf2 7.
                                    Rb5 Bc7 8. Rc5 Bb8 9. Rb5 <HT>
               18->   9.01   0.41   1. ... bxa4 2. Rd5 Bb8 3. e5 Rf4 4.   
                                    Be2 g4 5. hxg4 hxg4 6. Bxa6 Rf2 7.
                                    Rb5 Bc7 8. Rc5 Bb8 9. Rb5 <HT> &#40;s=2&#41;
               19    11.16   0.35   1. ... bxa4 2. Rd5 Bb8 3. e5 Rf4 4.   
                                    Be2 g4 5. hxg4 hxg4 6. Bxa6 Rf2 7.
                                    Rb5 Bc7 8. Rc5 Bb8 9. Bb7 Re2 10. Ra5
                                    Bxe5 11. Rxa4 Kg3 <HT>
               19->  12.29   0.35   1. ... bxa4 2. Rd5 Bb8 3. e5 Rf4 4.   
                                    Be2 g4 5. hxg4 hxg4 6. Bxa6 Rf2 7.
                                    Rb5 Bc7 8. Rc5 Bb8 9. Bb7 Re2 10. Ra5
                                    Bxe5 11. Rxa4 Kg3 <HT>
               20    24.94   0.30   1. ... bxa4 2. Rd5 Re6 3. Ra5 f6 4.   
                                    Rxa4 Rb6 5. Ra5 Kg3 6. Bxh5 Kxg2 7.
                                    Bg4 Kf2 8. Rd5 Ke3 9. Bf5 Rb7 10. Ka3
                                    Kf4 11. Rd8
               20->  27.66   0.30   1. ... bxa4 2. Rd5 Re6 3. Ra5 f6 4.   
                                    Rxa4 Rb6 5. Ra5 Kg3 6. Bxh5 Kxg2 7.
                                    Bg4 Kf2 8. Rd5 Ke3 9. Bf5 Rb7 10. Ka3
                                    Kf4 11. Rd8
               21     1&#58;05   0.21   1. ... bxa4 2. Rd5 Re6 3. Bd1 f6 4.   
                                    Bxa4 Bf4 5. Bd1 Rxe4 6. Bf3 Re1 7.
                                    Ra5 Re6 8. Kb3 Rb6+ 9. Kc2 Be5 10.
                                    Rd5 Kg3 11. b4 g4 12. hxg4 hxg4
               21     1&#58;31     -1   1. ... Rxf3!                          
               21     1&#58;47  -0.98   1. ... Rxf3 2. gxf3 Kxh3 3. axb5 axb5 
                                    4. Rd5 Bf4 5. Rd7 Kg3 6. e5 h4 7. Rxf7
                                    Bxe5 8. Re7 <HT>
               21->   1&#58;47  -0.98   1. ... Rxf3 2. gxf3 Kxh3 3. axb5 axb5
                                    4. Rd5 Bf4 5. Rd7 Kg3 6. e5 h4 7. Rxf7
                                    Bxe5 8. Re7 <HT> &#40;s=2&#41;
               22     2&#58;00  -0.69   1. ... Rxf3 2. gxf3 Kxh3 3. axb5 axb5 
                                    4. Kb3 h4 5. c4 bxc4+ 6. Kxc4 Bf4 7.
                                    Rd1 Kg2 8. b4 h3 9. b5 h2 10. b6 h1=Q
                                    11. Rxh1 Kxh1 12. Kd5 <HT>
               22->   2&#58;10  -0.69   1. ... Rxf3 2. gxf3 Kxh3 3. axb5 axb5 
                                    4. Kb3 h4 5. c4 bxc4+ 6. Kxc4 Bf4 7.
                                    Rd1 Kg2 8. b4 h3 9. b5 h2 10. b6 h1=Q
                                    11. Rxh1 Kxh1 12. Kd5 <HT>
               23     2&#58;58  -1.00   1. ... Rxf3 2. gxf3 Kxh3 3. axb5 axb5 
                                    4. Kb3 h4 5. c4 bxc4+ 6. Kxc4 Bf4 7.
                                    Rd7 Kg2 8. Kd5 h3 9. Rxf7 h2 10. Rh7
                                    Kxf3 11. e5 Kg2 12. e6 h1=Q 13. Rxh1
                                    Kxh1
              time=3&#58;00  mat=1  n=3014819937  fh=93%  nps=16.7M           
              extensions=101.5M qchecks=101.0M reduced=383.5M pruned=887.2M
              predicted=0  evals=865.3M  50move=0  EGTBprobes=48K  hits=48K
              SMP->  splits=423400  aborts=39124  data=54/1024  elap=3&#58;00
terminating SMP processes.
Black&#40;1&#41;&#58; Rxf3
              time used&#58;   3&#58;00
Top
kgburcham
Posts: 2016
Joined: Sun Feb 17, 2008 4:19 pm

Re: nice exchange sac from Rybka 4

Post by kgburcham »

[D] 8/5p2/p4r2/1p2b1pp/P3P2k/2P2B1P/KP1R2P1/8 b - -

Deep Rybka 4 x64

17.03 0:03 -0.10++ 1...Rxf3 2.gxf3 Kxh3 3.axb5 axb5 4.Rd7 f6 (2.093.932) 697
17.01 0:03 -0.25++ 1...Rxf3 2.gxf3 Kxh3 3.axb5 axb5 4.Rd7 f6 (2.622.583) 729
17.01 0:05 -0.65++ 1...Rxf3 2.gxf3 Kxh3 (4.882.944) 822
17.01 0:14 -1.45++ 1...Rxf3 2.gxf3 Kxh3 (12.237.543) 837
17.01 0:20 -1.13 1...Rxf3 2.gxf3 Kxh3 3.Rd5 Bf4 4.b4 Kg3 5.c4 h4 6.cxb5 axb5 7.a5 h3 8.a6 h2 9.a7 h1Q 10.a8Q Qg2+ 11.Kb1 Qxf3 12.Qe8 Qb3+ 13.Ka1 Qa4+ 14.Kb1 Qxb4+ (17.593.215) 862
18.01 0:21 -1.25++ 1...Rxf3 2.gxf3 Kxh3 3.Rd5 Bf4 4.b4 Kg3 5.c4 h4 6.cxb5 axb5 7.a5 h3 8.a6 h2 9.a7 h1Q 10.a8Q Qg2+ 11.Kb1 Qg1+ 12.Ka2 Qf2+ 13.Ka1 Qf1+ 14.Ka2 Qc4+ (18.563.770) 867
18.01 0:22 -1.40++ 1...Rxf3 2.gxf3 Kxh3 3.Rd5 Bf4 4.b4 Kg3 5.c4 h4 6.cxb5 axb5 7.a5 h3 8.a6 h2 9.a7 h1Q 10.a8Q Qg2+ 11.Kb1 Qg1+ 12.Ka2 Qf2+ 13.Ka1 Qf1+ 14.Ka2 Qc4+ (19.707.648) 877
18.01 0:30 -0.25 1...Rxf3 2.gxf3 Kxh3 3.Rd5 f6 4.axb5 axb5 5.Rxb5 h4 6.c4 Kg3 7.Rxe5 fxe5 8.c5 h3 9.c6 h2 10.c7 h1Q 11.c8Q Qxf3 12.Qf5 Qxf5 13.exf5 e4 14.f6 e3 (26.333.955) 876
19.01 0:31 -0.25 1...Rxf3 2.gxf3 Kxh3 3.Rd5 f6 4.axb5 axb5 5.Rxb5 h4 6.c4 Kg3 7.Rxe5 fxe5 8.c5 h3 9.c6 h2 10.c7 h1Q 11.c8Q Qxf3 12.Qf5 Qxf5 13.exf5 e4 14.f6 e3 (27.286.564) 877
20.01 0:32 -0.25 1...Rxf3 2.gxf3 Kxh3 3.Rd5 f6 4.axb5 axb5 5.Rxb5 h4 6.c4 Kg3 7.Rxe5 fxe5 8.c5 h3 9.c6 h2 10.c7 h1Q 11.c8Q Qxf3 12.Qf5 Qxf5 13.exf5 e4 14.f6 e3 (28.425.452) 872
21.01 0:35 -0.25 1...Rxf3 2.gxf3 Kxh3 3.Rd5 f6 4.axb5 axb5 5.Rxb5 h4 6.c4 Kg3 7.Rxe5 fxe5 8.c5 h3 9.c6 h2 10.c7 h1Q 11.c8Q Qxf3 12.Qf5 Qxf5 13.exf5 e4 14.f6 e3 (30.858.876) 873
22.01 0:55 -0.10 1...Rxf3 2.gxf3 Kxh3 3.Rd5 f6 4.axb5 axb5 5.Rxb5 h4 6.c4 Kg3 7.Rxe5 fxe5 8.c5 h3 9.c6 h2 10.c7 h1Q 11.c8Q Qxf3 12.Qf5 Qf4 13.b4 g4 14.b5 Kh3 (46.335.682) 836
23.01 0:57 -0.10 1...Rxf3 2.gxf3 Kxh3 3.Rd5 f6 4.axb5 axb5 5.Rxb5 h4 6.c4 Kg3 7.Rxe5 fxe5 8.c5 h3 9.c6 h2 10.c7 h1Q 11.c8Q Qxf3 12.Qf5 Qf4 13.b4 g4 14.b5 Kh3 (48.156.502) 836
24.01 1:18 -0.10 1...Rxf3 2.gxf3 Kxh3 3.Rd5 f6 4.axb5 axb5 5.Rxb5 h4 6.c4 Kg3 7.Rxe5 fxe5 8.c5 h3 9.c6 h2 10.c7 h1Q 11.c8Q Qxf3 12.Qf5 Qf4 13.b4 g4 14.b5 Kh3 (64.135.615) 821
25.01 1:36 -0.10 1...Rxf3 2.gxf3 Kxh3 3.Rd5 f6 4.axb5 axb5 5.Rxb5 h4 6.c4 Kg3 7.Rxe5 fxe5 8.c5 h3 9.c6 h2 10.c7 h1Q 11.c8Q Qxf3 12.Qf5 Qf4 13.b4 g4 14.b5 Qd2+ (79.186.165) 822
26.01 2:35 0.00 1...Rxf3 2.gxf3 Kxh3 3.Rd5 f6 4.axb5 axb5 5.Rxb5 h4 6.c4 Kg3 7.Rxe5 fxe5 8.c5 h3 9.c6 h2 10.c7 h1Q 11.c8Q Qxf3 12.Qf5 Qf4 13.b4 g4 14.b5 Qd2+ (125.340.340) 807
27.01 3:15 0.00 1...Rxf3 2.gxf3 Kxh3 3.Rd5 f6 4.axb5 axb5 5.Rxb5 h4 6.c4 Kg3 7.Rxe5 fxe5 8.c5 h3 9.c6 h2 10.c7 h1Q 11.c8Q Qxf3 12.Qf5 Qf4 13.b4 g4 14.b5 Qd2+ (157.767.612) 808
28.01 4:33 0.00 1...Rxf3 2.gxf3 Kxh3 3.Rd5 f6 4.axb5 axb5 5.Rxb5 h4 6.c4 Kg3 7.Rxe5 fxe5 8.c5 h3 9.c6 h2 10.c7 h1Q 11.c8Q Qxf3 12.Qf5 Qf4 13.b4 g4 14.b5 Qd2+ (219.840.867) 804
28.01 7:27 0.00 1...Rxf3 2.gxf3 Kxh3 3.Rd5 f6 4.axb5 axb5 5.Rxb5 h4 6.c4 Kg3 7.Rxe5 fxe5 8.c5 h3 9.c6 h2 10.c7 h1Q 11.c8Q Qxf3 12.Qf5 Qf4 13.b4 g4 14.b5 Qd2+ (359.451.852) 802
best move: Rf6xf3 time: 7:28.281 min n/s: 802.654 nodes: 359.451.852
Top
Dann Corbit
Posts: 12541
Joined: Wed Mar 08, 2006 8:57 pm
Location: Redmond, WA USA

Re: nice exchange sac from Rybka 4

Post by Dann Corbit »

jdart wrote:From this tourney:

http://talkchess.com/forum/viewtopic.ph ... 26&t=35202, in the game Deep Saros 0.9-Deep Rybka 4:

[D] 8/5p2/p4r2/1p2b1pp/P3P2k/2P2B1P/KP1R2P1/8 b - -

bm Rxf3
Rybka 4 seems to have kicked all the pretty right out of it:

Code: Select all

Analysis from Q&#58;\rxf3.epd   
6/29/2010 1&#58;40&#58;43 PM Level&#58; 43200 Seconds
Analyzing engine&#58; Deep Rybka 4 x64

1&#41; Rxf3; id "Deep Saros 
    Searching move&#58; Rf6xf3
    Best move &#40;Deep Rybka 4 x64&#41;&#58; Rf6xf3
    identical moves! Found in&#58; 00&#58;19
      2	00&#58;01	         148	287	-0.03	b5xa4 Ka2a3 g5g4 h3xg4 h5xg4 Bf3d1
      3	00&#58;01	         273	530	 0.00	b5xa4 Ka2a3 g5g4 h3xg4 h5xg4 Bf3d1 Be5f4
      4	00&#58;01	         457	860	-0.13	b5xa4 Ka2a3 g5g4 h3xg4 h5xg4 Bf3d1 Rf6f4
      5	00&#58;01	       1.032	1.740	-0.07	b5xa4 Ka2a3 g5g4 h3xg4 h5xg4 Bf3d1 Kh4g3 Ka3b4 Rf6f4
      6	00&#58;01	       4.854	7.584	-0.20	g5g4 h3xg4 h5xg4 Bf3d1 Rf6f4 a4xb5 a6xb5 Rd2d5 Rf4xe4 Rd5xb5 Kh4g3 Rb5b4 Re4xb4 c3xb4 Be5f4 b4b5
      7	00&#58;01	      11.343	17.291	-0.19	g5g4 h3xg4 h5xg4 Bf3d1 b5xa4 Bd1xa4 Rf6f4 Ba4c6 g4g3 Rd2d5 f7f6 Bc6b7 Rf4f2 Bb7xa6
      8	00&#58;01	      19.210	27.962	-0.18	g5g4 h3xg4 h5xg4 Bf3d1 b5xa4 Bd1xa4 Rf6f4 Ka2b3 Kh4g3 Ba4c6 Rf4f2 Rd2xf2 Kg3xf2 Bc6d7 Kf2g3
      9	00&#58;01	      27.629	37.641	-0.14	g5g4 h3xg4 h5xg4 Bf3d1 b5xa4 Bd1xa4 Rf6f4 Ka2b3 Kh4g3 Ba4d7 Rf4xe4 Bd7c6 Re4e1 Rd2d3+ Kg3f4 Rd3d7
     10	00&#58;01	      41.751	52.451	-0.11	g5g4 h3xg4 h5xg4 Bf3d1 b5xa4 Bd1xa4 Rf6f4 Rd2e2 Kh4g5 Ba4c2 g4g3 Bc2d3 a6a5 Ka2a3 Rf4f2 Ka3a4
     11	00&#58;01	      95.356	95.451	-0.11	g5g4 h3xg4 h5xg4 Bf3d1 b5xa4 Bd1xa4 Rf6f4 Rd2e2 Kh4g5 Ba4c2 g4g3 Bc2d3 Rf4f6 Ka2a3 Rf6b6
     12+	00&#58;02	     402.635	191.093	+0.01	g5g4 h3xg4 h5xg4 Bf3d1 Rf6f1 a4xb5 a6xb5 Rd2d5 Be5f4 Rd5d7 f7f6 Bd1e2 Rf1f2
     12	00&#58;02	     459.580	199.038	 0.00	g5g4 h3xg4 h5xg4 Bf3d1 Rf6f1 a4xb5 a6xb5 Ka2b3 Be5f4 Rd2d7 f7f6 Kb3b4 Rf1f2 Rd7h7+ Kh4g3 Rh7g7 Bf4g5 e4e5 Rf2xb2+ Kb4a5 Rb2b1 e5xf6 Bg5xf6 Rg7xg4+ Kg3h2 Bd1f3 Bf6xc3+ Ka5b6 Rb1b2
     13	00&#58;03	     518.926	206.578	 0.00	g5g4 h3xg4 h5xg4 Bf3d1 Rf6f1 a4xb5 a6xb5 Ka2b3 Be5f4 Rd2d7 f7f6 Kb3b4 Rf1f2 Rd7h7+ Kh4g3 Rh7g7 Bf4g5 e4e5 Rf2xb2+ Kb4a5 Rb2b1 e5xf6 Bg5xf6 Rg7xg4+ Kg3h2 Bd1f3 Bf6xc3+ Ka5b6 Rb1b2
     14	00&#58;03	     623.487	217.167	 0.00	g5g4 h3xg4 h5xg4 Bf3d1 Rf6f1 a4xb5 a6xb5 Ka2b3 Be5f4 Rd2d7 f7f6 Kb3b4 Rf1f2 Rd7h7+ Kh4g3 Rh7g7 Bf4g5 e4e5 Rf2xb2+ Kb4a5 Rb2b1 e5xf6 Bg5xf6 Rg7xg4+ Kg3h2 Bd1f3 Bf6xc3+ Ka5b6 Rb1b2
     15	00&#58;04	     861.539	235.973	 0.00	g5g4 h3xg4 h5xg4 Bf3d1 Rf6f1 a4xb5 a6xb5 Ka2b3 Be5f4 Rd2d7 f7f6 Kb3b4 Rf1f2 Rd7h7+ Kh4g3 Rh7g7 Rf2xb2+ Kb4a3 Bf4c1 Rg7xg4+ Kg3h2 Rg4h4+ Kh2xg2 Bd1b3 Kg2g3 Rh4h1 Rb2b1+ Ka3a2 Rb1b2+ Ka2a3 Rb2b1+
     16	00&#58;05	   1.113.524	248.665	 0.00	g5g4 h3xg4 h5xg4 Bf3d1 Rf6f1 a4xb5 a6xb5 Ka2b3 Be5f4 Rd2d7 f7f6 Kb3b4 Rf1f2 Rd7h7+ Kh4g3 Rh7g7 Rf2xb2+ Kb4a3 Bf4c1 Rg7xg4+ Kg3h2 Rg4h4+ Kh2xg2 Bd1b3 Kg2g3 Rh4h1 Rb2b1+ Ka3a2 Rb1b2+ Ka2a3 Rb2b1+
     17	00&#58;06	   1.711.899	264.385	 0.00	g5g4 h3xg4 h5xg4 Bf3d1 Rf6f1 a4xb5 a6xb5 Ka2b3 Be5f4 Rd2d7 f7f6 Kb3b4 Rf1f2 Rd7h7+ Kh4g3 Rh7g7 Rf2xb2+ Kb4a3 Bf4c1 Rg7xg4+ Kg3h2 Rg4h4+ Kh2xg2 Bd1b3 Kg2g3 Rh4h1 Rb2b1+ Ka3a2 Rb1b2+ Ka2a3 Rb2b1+
     18	00&#58;11	   2.819.808	261.577	 0.00	g5g4 h3xg4 h5xg4 Bf3d1 Rf6f1 a4xb5 a6xb5 Ka2b3 Be5f4 Rd2d7 f7f6 Kb3b4 Rf1f2 Rd7h7+ Kh4g3 Rh7g7 Rf2xb2+ Kb4a3 Bf4c1 Rg7xg4+ Kg3h2 Rg4h4+ Kh2xg2 Bd1b3 Kg2g3 Rh4h1 Rb2b1+ Ka3a2 Rb1b2+ Ka2a3 Rb2b1+
     19	00&#58;12	   3.155.760	261.346	 0.00	g5g4 h3xg4 h5xg4 Bf3d1 Rf6f1 a4xb5 a6xb5 Ka2b3 Be5f4 Rd2d7 f7f6 Kb3b4 Rf1f2 Rd7h7+ Kh4g3 Rh7g7 Rf2xb2+ Kb4a3 Bf4c1 Rg7xg4+ Kg3h2 Rg4h4+ Kh2xg2 Bd1b3 Kg2g3 Rh4h1 Rb2b1+ Ka3a2 Rb1b2+ Ka2a3 Rb2b1+
     19+	00&#58;19	   5.244.757	280.153	+0.12	Rf6xf3 g2xf3 Kh4xh3 a4xb5 a6xb5 Ka2b3 h5h4 c3c4 Kh3g3 c4xb5 h4h3 b5b6 h3h2 Rd2xh2 Kg3xh2 b6b7 Kh2g2
     19+	00&#58;21	   6.091.635	295.595	+0.27	Rf6xf3 g2xf3 Kh4xh3 a4xb5 a6xb5 Rd2d7 f7f6
     19+	00&#58;33	   9.881.068	296.666	+0.67	Rf6xf3 g2xf3 Kh4xh3 a4xb5 a6xb5
     19	01&#58;48	  29.685.521	274.469	+0.59	Rf6xf3 g2xf3 Kh4xh3 Rd2d5 Be5f4 c3c4 b5xc4 Rd5a5 h5h4 Ra5xa6 Kh3g2 Ra6f6 h4h3 Rf6xf7 h3h2 Rf7h7 Bf4c7 Ka2a3 Bc7d6+ Ka3a2 Bd6c7 Ka2a3 Bc7d6+ Ka3a2 Bd6c7 Ka2a3 Bc7d6+ Ka3a2 Bd6c7 Ka2a3 Bc7d6+
     20	02&#58;13	  35.087.748	263.401	 0.00	Rf6xf3 g2xf3 Kh4xh3 Rd2d5 Be5f4 c3c4 b5xc4 Rd5a5 h5h4 Ra5xa6 Kh3g2 Ra6f6 h4h3 Rf6xf7 h3h2 Rf7h7 Bf4c7 Ka2a3 Bc7d6+ Ka3a2 Bd6c7 Ka2a3 Bc7d6+ Ka3a2 Bd6c7 Ka2a3 Bc7d6+ Ka3a2 Bd6c7 Ka2a3 Bc7d6+
     21	02&#58;18	  36.462.919	263.363	 0.00	Rf6xf3 g2xf3 Kh4xh3 Rd2d5 Be5f4 c3c4 b5xc4 Rd5a5 h5h4 Ra5xa6 Kh3g2 Ra6f6 h4h3 Rf6xf7 h3h2 Rf7h7 Bf4c7 Ka2a3 Bc7d6+ Ka3a2 Bd6c7 Ka2a3 Bc7d6+ Ka3a2 Bd6c7 Ka2a3 Bc7d6+ Ka3a2 Bd6c7 Ka2a3 Bc7d6+
     22	03&#58;07	  50.816.332	271.180	 0.00	Rf6xf3 g2xf3 Kh4xh3 Rd2d5 Be5f4 c3c4 b5xc4 Rd5a5 h5h4 Ra5xa6 Kh3g2 Ra6f6 h4h3 Rf6xf7 h3h2 Rf7h7 Bf4c7 Ka2a3 Bc7d6+ Ka3a2 Bd6c7 Ka2a3 Bc7d6+ Ka3a2 Bd6c7 Ka2a3 Bc7d6+ Ka3a2 Bd6c7 Ka2a3 Bc7d6+
     23	03&#58;33	  56.107.055	262.830	 0.00	Rf6xf3 g2xf3 Kh4xh3 Rd2d5 Be5f4 c3c4 b5xc4 Rd5a5 h5h4 Ra5xa6 Kh3g2 Ra6f6 h4h3 Rf6xf7 h3h2 Rf7h7 Bf4c7 Ka2a3 Bc7d6+ Ka3a2 Bd6c7 Ka2a3 Bc7d6+ Ka3a2 Bd6c7 Ka2a3 Bc7d6+ Ka3a2 Bd6c7 Ka2a3 Bc7d6+
     24	04&#58;08	  64.919.535	261.366	 0.00	Rf6xf3 g2xf3 Kh4xh3 Rd2d5 Be5f4 c3c4 b5xc4 Rd5a5 h5h4 Ra5xa6 Kh3g2 Ra6f6 h4h3 Rf6xf7 h3h2 Rf7h7 Bf4c7 Ka2a3 Bc7d6+ Ka3a2 Bd6c7 Ka2a3 Bc7d6+ Ka3a2 Bd6c7 Ka2a3 Bc7d6+ Ka3a2 Bd6c7 Ka2a3 Bc7d6+
     25	05&#58;25	  80.040.879	246.104	 0.00	Rf6xf3 g2xf3 Kh4xh3 Rd2d5 Be5f4 c3c4 b5xc4 Rd5a5 h5h4 Ra5xa6 Kh3g2 Ra6f6 h4h3 Rf6xf7 h3h2 Rf7h7 Bf4c7 Ka2a3 Bc7d6+ Ka3a2 Bd6c7 Ka2a3 Bc7d6+ Ka3a2 Bd6c7 Ka2a3 Bc7d6+ Ka3a2 Bd6c7 Ka2a3 Bc7d6+
     26	08&#58;04	 120.081.668	247.954	 0.00	Rf6xf3 g2xf3 Kh4xh3 Rd2d5 Be5f4 c3c4 b5xc4 Rd5a5 h5h4 Ra5xa6 Kh3g2 Ra6f6 h4h3 Rf6xf7 h3h2 Rf7h7 Bf4c7 Ka2a3 Bc7d6+ Ka3a2 Bd6c7 Ka2a3 Bc7d6+ Ka3a2 Bd6c7 Ka2a3 Bc7d6+ Ka3a2 Bd6c7 Ka2a3 Bc7d6+
     27	13&#58;13	 195.960.073	247.053	 0.00	Rf6xf3 g2xf3 Kh4xh3 Rd2d5 Be5f4 c3c4 b5xc4 Rd5a5 h5h4 Ra5xa6 Kh3g2 Ra6f6 h4h3 Rf6xf7 h3h2 Rf7h7 Bf4c7 Ka2a3 Bc7d6+ Ka3a2 Bd6c7 Ka2a3 Bc7d6+ Ka3a2 Bd6c7 Ka2a3 Bc7d6+ Ka3a2 Bd6c7 Ka2a3 Bc7d6+
   6/29/2010 1&#58;54&#58;54 PM, Time for this analysis&#58; 00&#58;14&#58;03, Rated time&#58; 00&#58;19

1 of 1 matching moves
6/29/2010 1&#58;54&#58;54 PM, Total time&#58; 12&#58;14&#58;11 AM
Rated time&#58; 00&#58;19 = 19 Seconds
Top
F. Bluemers
Posts: 868
Joined: Thu Mar 09, 2006 11:21 pm
Location: Nederland

Re: nice exchange sac from Rybka 4

Post by F. Bluemers »

jdart wrote:From this tourney:

http://talkchess.com/forum/viewtopic.ph ... 26&t=35202, in the game Deep Saros 0.9-Deep Rybka 4:

[D] 8/5p2/p4r2/1p2b1pp/P3P2k/2P2B1P/KP1R2P1/8 b - -

bm Rxf3
Dirty 6jun almost immediatly finds Rf3,although its not too happy about it and needs 4.5 minutes before the score rises to a measily 0.35.
All without bitbases or egtb though.

Code: Select all

 23	+0.35	701.6M	10&#58;08.70	Rxf3 gxf3 Kxh3 axb5 axb5 Kb3 Kg3 Rd5 f6 Rd3 Kf2 Kc2 h4 Rd1 Bf4 Kd3 Kxf3 b4 Kg3
 22	+0.35	343.2M	5&#58;00.08	Rxf3 gxf3 Kxh3 axb5 axb5 Kb3 Kg3 Rd3 h4 Kc2 f6 Re3 Bf4 Re1 Kxf3 Kd3 Kg3 Rd1 Be5 Rc1 Bf4 Rf1
 22	+0.35	314.1M	4&#58;33.51	Rxf3 gxf3 Kxh3 axb5 axb5 Kb3 Kg3 Rd3 h4 Kc2 f6 Re3 Bf4 Re1 Kxf3 Kd3 Kg3 Rd1 Be5 Rc1 Bf4 Rf1
 21	+0.07	133.3M	1&#58;56.51	Rxf3 gxf3 Kxh3 axb5 axb5 Kb3 Kg3 Rd5 f6 Rd3 h4 Kb4 h3 f4+ Kxf4 Rxh3 Kxe4 Rh1 f5 Re1+ Kf4 Rf1+
 21	+0.07	122.8M	1&#58;46.61	Rxf3 gxf3 Kxh3 axb5 axb5 Kb3 Kg3 Rd5 f6 Rd3 h4 Kb4 h3 f4+ Kxf4 Rxh3 Kxe4 Rh1 f5 Re1+ Kf4 Rf1+
 20	-0.15	71.0M	1&#58;02.52	Rxf3 gxf3 Kxh3 axb5 axb5 Kb3 Kg3 Rd5 f6 Rd3 Kf4 Kb4 g4 fxg4 Kxe4 Rd1 hxg4 Re1+ Kf5 Kxb5
 20	-0.15	59.8M	0&#58;51.41	Rxf3 gxf3 Kxh3 axb5 axb5 Kb3 Kg3 Rd5 f6 Rd3 Kf4 Kb4 g4 fxg4 Kxe4 Rd1 hxg4 Re1+ Kf5 Kxb5
 19	0.00	32.4M	0&#58;29.07	Rxf3 gxf3 Kxh3 axb5 axb5 Rd5 f6 Kb3 Kg3 Rd3 Kf4 Kb4 g4 fxg4 hxg4 Rd1 Kxe4 Re1+ Kf5 Kxb5
 19	0.00	25.4M	0&#58;22.29	Rxf3 gxf3 Kxh3 axb5 axb5 Rd5 f6 Kb3 Kg3 Rd3 Kf4 Kb4 g4 fxg4 hxg4 Rd1 Kxe4 Re1+ Kf5 Kxb5
 18	-0.10	14.2M	0&#58;12.71	Rxf3 gxf3 Kxh3 axb5 axb5 Rd5 f6 Kb3 Kg3 Rd3 Kf4 Kb4 g4 fxg4 hxg4 Rd8 Kxe4 Kxb5
 18	-0.10	12.6M	0&#58;11.12	Rxf3 gxf3 Kxh3 axb5 axb5 Rd5 f6 Kb3 Kg3 Rd3 Kf4 Kb4 g4 fxg4 hxg4 Rd8 Kxe4 Kxb5
 17	-0.21	7.4M	0&#58;06.75	Rxf3 gxf3 Kxh3 axb5 axb5 Rd5 f6 Kb3 Kg3 Rd3 Kf4 Kb4 g4 fxg4 hxg4 Rd7 Kxe4
 17	-0.21	6.7M	0&#58;05.94	Rxf3 gxf3 Kxh3 axb5 axb5 Rd5 f6 Kb3 Kg3 Rd3 Kf4 Kb4 g4 fxg4 hxg4 Rd7 Kxe4
 16	-0.21	4.1M	0&#58;03.91	Rxf3 gxf3 Kxh3 axb5 axb5 Rd5 f6 Kb3 Kg3 Rd3 Kf4 Kb4 g4 fxg4 hxg4 Rd7
 16	-0.21	3.7M	0&#58;03.41	Rxf3 gxf3 Kxh3 axb5 axb5 Rd5 f6 Kb3 Kg3 Rd3 Kf4 Kb4 g4 fxg4 hxg4 Rd7
 15	-0.51	2.3M	0&#58;02.24	Rxf3 gxf3 Kxh3 axb5 axb5 Rd5 f6 Kb3 Kg3 Rd3 Kf4 Kb4 g4 fxg4 hxg4
 15	-0.51	1.8M	0&#58;01.74	Rxf3 gxf3 Kxh3 axb5 axb5 Rd5 f6 Kb3 Kg3 Rd3 Kf4 Kb4 g4 fxg4 hxg4
 14	-0.47	1.1M	0&#58;01.17	Rxf3 gxf3 Kxh3 axb5 axb5 Rd5 Bf4 Rd3 Kg3 Ka3 h4 Kb3 g4 fxg4+ Kxg4 Rd7
 14	-0.47	942541	0&#58;00.95	Rxf3 gxf3 Kxh3 axb5 axb5 Rd5 Bf4 Rd3 Kg3 Ka3 h4 Kb3 g4 fxg4+ Kxg4 Rd7
 13	-0.47	629840	0&#58;00.70	Rxf3 gxf3 Kxh3 axb5 axb5 Rd5 Bf4 Rd3 Kg3 Ka3 h4 Kb3 g4
 13	-0.47	531426	0&#58;00.57	Rxf3 gxf3 Kxh3 axb5 axb5 Rd5 Bf4 Rd3 Kg3 Ka3 h4 Kb3 g4
 12	-0.32	358310	0&#58;00.43	Rxf3 gxf3 Kxh3 axb5 axb5 Rd3 Kg3 Kb3 Kf4 Kb4 g4 fxg4
 12	-0.32	322171	0&#58;00.39	Rxf3 gxf3 Kxh3 axb5 axb5 Rd3 Kg3 Kb3 Kf4 Kb4 g4 fxg4
 11	-0.55	217215	0&#58;00.29	Rxf3 gxf3 Kxh3 axb5 axb5 Kb3 Bf4 Rd3 h4 c4 bxc4+ Kxc4
 11	-0.55	194310	0&#58;00.26	Rxf3 gxf3 Kxh3 axb5 axb5 Kb3 Bf4 Rd3 h4 c4 bxc4+ Kxc4
 10	-0.57	136459	0&#58;00.20	Rxf3 gxf3 Kxh3 axb5 axb5 Rd5 Bf4 Kb3 Kg3 Rd3
 10	-0.57	135912	0&#58;00.20	Rxf3 gxf3 Kxh3 axb5 axb5 Rd5 Bf4 Kb3 Kg3 Rd3
 10	-0.78	83038	0&#58;00.14	g4 hxg4 hxg4 Bd1 Rd6 Rxd6 Bxd6 Be2 bxa4 Bxa6
  9	-0.78	71842	0&#58;00.12	g4 hxg4 hxg4 Bd1 Rd6 Rxd6 Bxd6 Be2 bxa4
  9	-0.78	54908	0&#58;00.09	g4 hxg4 hxg4 Bd1 Rd6 Rxd6 Bxd6 Be2 bxa4
  8	-0.68	35586	0&#58;00.06	g4 Bd1 Rd6 Rd5 gxh3 gxh3 Kxh3 Bxh5
  8	-0.68	27784	0&#58;00.06	g4 Bd1 Rd6 Rd5 gxh3 gxh3 Kxh3 Bxh5
  7	-0.64	16970	0&#58;00.04	g4 Be2 Rf2 axb5 axb5 hxg4 hxg4
  7	-0.64	13958	0&#58;00.04	g4 Be2 Rf2 axb5 axb5 hxg4 hxg4
  6	-0.64	11272	0&#58;00.03	g4 Be2 Rf2 axb5 axb5 hxg4
  6	-0.64	9339	0&#58;00.03	g4 Be2 Rf2 axb5 axb5 hxg4
  5	-0.82	7489	0&#58;00.03	g4 Be2 Rf2 axb5 axb5
  5	-0.82	6587	0&#58;00.03	g4 Be2 Rf2 axb5 axb5
  5	-1.01	5012	0&#58;00.01	bxa4 Ka3 g4 Bd1 Bf4
  5	-2.22	2774	0&#58;00.01	Rxf3 gxf3 Kxh3 Rd5 Bf4
  4	-0.79	2112	0&#58;00.01	Rxf3 gxf3 Kxh3 Kb3
  4	-0.79	679	0&#58;00.01	Rxf3 gxf3 Kxh3 Kb3
  3	-0.41	509	0&#58;00.01	Rxf3 gxf3 Kxh3
  3	-0.41	394	0&#58;00.00	Rxf3 gxf3 Kxh3
  2	-0.41	244	0&#58;00.00	Rxf3 gxf3
  2	-0.41	118	0&#58;00.00	Rxf3 gxf3
  1	-0.41	89	0&#58;00.00	Rxf3
Top
yanquis1972
Posts: 1766
Joined: Wed Jun 03, 2009 12:14 am

Re: nice exchange sac from Rybka 4

Post by yanquis1972 »

yes, as kg & dann show, it appears only to draw:


1... Rxf3 2. gxf3 Kxh3 3. Rd5 f6 4. axb5 axb5 5. Rxb5 h4 6. Rxe5 fxe5 7. c4 Kg3 8. c5 h3 9. c6 h2 10. c7 h1=Q 11. c8=Q Qxf3 12. Qf5
Top
Sean Evans
Posts: 1777
Joined: Thu Jun 05, 2008 10:58 pm
Location: Canada

Re: nice exchange sac from Rybka 4

Post by Sean Evans »

It is an interesting exchange down. To this human, I don't see enough positional advantage for the material loss - Rook for Bishop. :?

Cordially,

Sean
Top

Return to “Computer Chess Club: General Topics”