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Up Topic The Rybka Lounge / Test Positions / Petrosian Exchange Sac's
- - By TheHug (Bronze) Date 2010-12-08 00:51
Of course Petrosian was probably one of the first to came up with these kinds of exchange sac's

r1r3k1/1b2qnpp/p2b1p2/Pp1p4/3P1P1P/1Q2P1P1/1B1NBK2/R2R4 b - - 0 0


This is an easier example, I will look for more... Which engines see this move instantly? :lol:
Parent - By dcorbit (***) Date 2010-12-08 01:37

[Event "WCh"]
[Site "?"]
[Date "1969.??.??"]
[Round "23"]
[White "Spassky, Boris V"]
[Black "Petrosian, Tigran A"]
[Result "0-1"]
[ECO "E12m"]
[Variation "Queen's Indian: Petrosian, 5.Nc3 d5"]

1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.a3 Bb7 5.Nc3 d5 6.e3 Nbd7 7.cxd5 exd5 8.Be2
Bd6 9.b4 O-O 10.O-O a6 11.Qb3 Qe7 12.Rb1 Ne4 13.a4 Ndf6 14.b5 Nxc3 15.Qxc3
Ne4 16.Qc2 Rfc8 17.Bb2 c6 18.bxc6 Bxc6 19.Qb3 Qd7 20.Ra1 b5 21.a5 Bb7 22.
Ne5 Qd8 23.Rfd1 Qh4 24.g3 Qe7 25.f3 Ng5 26.h4 Ne6 27.f4 f6 28.Nf3 Nd8 29.
Kf2 Nf7 30.Nd2 Rc4 31.Qd3 Re8 32.Bf3 Bb4 33.Ba3 Bxa3 34.Rxa3 Nd6 35.Re1 f5
36.Raa1 Ne4+ 37.Bxe4 fxe4 38.Qb1 Qd7 39.Ra2 Rec8 40.Nxc4 dxc4 41.d5 Bxd5
42.Rd1 c3 43.Rc2 Qh3 44.Rg1 Qg4 45.Kg2 Qf3+ 46.Kh2 Qxe3 47.f5 Qc5 48.Rf1
b4 49.f6 b3 50.Rcf2 c2 51.Qc1 e3 52.f7+ Kf8 53.Rf5 b2 54.Qxb2 c1=Q 55.
Qxg7+ Kxg7 56.Rg5+ 0-1
Parent - - By dcorbit (***) Date 2010-12-08 02:57
Hopefully not too many engines find Rc4, since Bb4 is clearly the better move.
Parent - - By TheHug (Bronze) Date 2010-12-08 04:07
There are a couple of engines that like Rc4. I will look again, and try and find a case were this kind of sac is good.
Parent - By dcorbit (***) Date 2010-12-08 07:26
I guess that for every strong engine that likes Rc4 if you let it think long enough it will change its mind.
Every strong engine I tried that had Rc4 in mind for a while abandoned it later.

The longest to switch was Bison:

Analyzing engine: Bison-9-11-64

1) Rc4;                
    Searching move: Rc8-c4
    Best move (Bison-9-11-64): Bd6-b4
    Not found in: 10:00
     3/7  00:00           854  6.671  +0.87  Bb7c6 Ra1c1 b5b4
     4/8  00:00         3.703  28.929  +0.57  Bb7c6 Be2g4 Rc8c7 Ra1c1
     4/8  00:00         6.784  53.000  +0.85  Rc8e8 Rd1c1 Ra8c8 Rc1xc8 Re8xc8
     4/8  00:00         8.079  63.117  +0.88  Rc8c7 Rd1c1 Ra8e8 Rc1xc7 Qe7xc7
     5/14  00:00         9.763  76.273  +0.59  Rc8c7 Rd1c1 Ra8e8 Rc1xc7 Qe7xc7 Kf2g2
     5/14  00:00        12.612  98.531  +0.92  Rc8e8 Rd1c1 Ra8b8 Rc1c2 Qe7d7
     6/14  00:00        19.464  152.062  +0.83  Rc8e8 Rd1c1 Qe7d7 Kf2g2 Ra8c8 Rc1xc8 Re8xc8
     7/15  00:00        43.344  338.625  +0.86  Rc8e8 Rd1c1 Ra8d8 Rc1c2 Qe7e6 e3e4 d5xe4 Qb3xe6 Re8xe6
     8/17  00:00        66.163  516.898  +0.78  Rc8e8 Rd1c1 Ra8d8 Be2g4 Nf7h6 Bg4f3 Qe7e6 Kf2g2 Qe6xe3 Qb3xe3 Re8xe3
     8/17  00:00       123.594  792.269  +0.80  Ra8b8 Kf2g2 Rc8e8 Be2g4 Rb8d8 Ra1c1 Qe7xe3 Qb3xe3 Re8xe3
     9/19  00:00       165.157  813.581  +0.77  Ra8b8 Rd1c1 Rc8xc1 Bb2xc1 Rb8e8 Bc1a3 Bd6xa3 Qb3xa3 b5b4 Qa3b3 Qe7d6
    10/19  00:00       321.725  860.227  +0.67  Ra8b8 Be2g4 Rc8e8 Qb3d3 b5b4 Rd1c1 Bd6c7 Bg4f5 g7g6 Bf5g4
    10/19  00:00       354.142  841.192  +1.02  Rc8e8 Rd1c1 Ra8d8 Rc1c2 Qe7e6 Ra1c1 Qe6h3 Be2xb5 a6xb5 a5a6 Bb7xa6
    11/21  00:00       590.156  860.285  +0.72  Rc8e8 Rd1c1 Ra8d8 Rc1c2 Qe7e6 e3e4 d5xe4 Qb3xe6 Re8xe6 Kf2e3 f6f5 Ra1c1
    12/26  00:01     1.403.888  865.528  +0.80  Rc8e8 Rd1c1 Qe7e6 e3e4 d5xe4 Qb3xe6 Re8xe6 Nd2f1 Ra8d8 Nf1e3 Bd6b4 Rc1c7 Bb7c6
    13/26  00:02     2.076.294  864.402  +0.73  Rc8e8 Rd1c1 Ra8c8 Rc1xc8 Bb7xc8 Bb2a3 Bc8e6 Ba3xd6 Nf7xd6 Ra1c1 Nd6c4 Nd2xc4 d5xc4 Qb3b2 Be6d5 Qb2c3
    13/26  00:03     3.425.093  874.864  +0.82  Bd6b4 Be2f3 Ra8b8 Kf2e2 Rc8e8 Rd1c1 Qe7d6 h4h5 Rb8d8 Bb2a3 Bb4xa3 Ra1xa3 b5b4 Ra3a1
    14/28  00:05     4.479.933  872.940  +0.98  Bd6b4 Be2f3 Ra8b8 Ra1a2 Rc8e8 Nd2f1 Rb8d8 Kf2g2 Qe7d6 Rd1c1 Rd8c8 Rc1xc8 Re8xc8 Bb2a3 Bb4xa3 Ra2xa3
    15/29  00:06     5.903.941  876.085  +0.80  Bd6b4 Be2f3 Ra8b8 Ra1a2 Rc8e8 Nd2f1 Rb8d8 Kf2g2 Qe7d6 Rd1c1 Rd8c8 Rc1xc8 Re8xc8 Qb3d3 Qd6e6 f4f5
    15/29  00:11     9.897.644  880.025  +0.94  Rc8c4 Qb3d3 Ra8e8 Rd1c1 Qe7e6 Be2h5 g7g6 Bh5f3 Rc4xc1 Ra1xc1 Nf7h6 h4h5 Nh6f5 Rc1c2 Nf5xe3 h5xg6 h7xg6 Qd3xg6+ Kg8h8
    16/34  00:19    17.516.459  884.133  +1.12  Rc8c4 Qb3d3 Ra8e8 Rd1c1 Bd6b4 Bb2c3 Nf7d6 Bc3xb4 Rc4xb4 Be2f3 Nd6c4 Nd2xc4 d5xc4 Qd3d2 Bb7xf3 Kf2xf3 Rb4b3 Rc1c3 Qe7e4+ Kf3f2
    17/36  00:32    29.372.884  893.634  +0.74  Rc8c4 Be2f3 Ra8e8 Rd1e1 Bd6b4 Bb2a3 Bb4xa3 Nd2xc4 d5xc4 Qb3xa3 b5b4 Qa3a4 Nf7d6 Ra1c1 Bb7xf3 Kf2xf3 Qe7b7+ Kf3f2 h7h5
    17/36  00:39    35.595.872  893.425  +0.97  Bd6b4 Be2f3 Ra8b8 Ra1a2 Rc8e8 Nd2f1 Qe7d6 Kf2g1 Re8c8 Rd1c1 Rc8c4 Bf3e2 Rb8e8 Bb2c3 Bb4xc3 Rc1xc3 Rc4b4 Qb3c2
    18/41  01:29    80.008.060  891.017  +1.15  Bd6b4 Be2f3 Rc8c7 Kf2g1 Ra8c8 Nd2f1 Rc7c4 Bf3e2 Bb4d6 Rd1c1 Qe7d7 Ra1b1 Rc8e8 Bb2c3 Rc4a4 Rb1a1 Ra4xa1 Bc3xa1 b5b4
    19/43  02:25   129.933.964  895.985  +1.09  Bd6b4 Kf2g1 Rc8c4 Nd2f1 Ra8c8 Be2d3 Rc8c7 Qb3a2 Bb4d6 h4h5 Bb7c8 Rd1c1 Bc8g4 Ra1b1 Rc4xc1 Rb1xc1 Rc7xc1 Bb2xc1 Qe7e6 Qa2b1 Bg4xh5 Bd3xh7+ Kg8f8
    20/48  04:10   225.749.117  900.500  +0.97  Bd6b4 Kf2g1 Rc8c4 Nd2f1 Ra8c8 Be2d3 Rc8c7 Qb3a2 Bb4d6 h4h5 Bb7c8 Ra1c1 Bc8g4 Bd3xc4 d5xc4 Rd1d2 Bg4xh5 d4d5 Bh5f3 Bb2c3
   12/07/2010 9:03:55 PM, Time for this analysis: 00:10:00, Rated time: 10:00
Up Topic The Rybka Lounge / Test Positions / Petrosian Exchange Sac's

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