Difficult Test Position: Positional Sacrifice

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Terry McCracken
Posts: 16465
Joined: Wed Aug 01, 2007 4:16 am
Location: Canada

Re: Difficult Test Position: Positional Sacrifice

Post by Terry McCracken »

beachknight wrote:
swami wrote:I don't believe that e5 is the best move positionally, There still is lots of material left on the board. Maybe when the king is castled and you're going for an attack, e5 would look Ok at that point. Now White doesn't have his king castled, nor ready for the fast attack. King side is more or less controlled by Black, and queen side will be dominated as well. So don't really see the point behind e5 now.
I dont even have an ELO, but I think you are right.

Best,
Run the computers a few plys in, say 1. e5..fxe3 2. e6...and see what a fast computer with top software will evaluate after a day.
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Spock

Re: Difficult Test Position: Positional Sacrifice

Post by Spock »

Terry McCracken wrote:
Run the computers a few plys in, say 1. e5..fxe3 2. e6...and see what a fast computer with top software will evaluate after a day.
Yes, if they don't choose e5, make it for them and then see how they see things
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Spock

Re: Difficult Test Position: Positional Sacrifice

Post by Spock »

Done that, 1. e5..fxe3 2. e6..., now black to move. Have Quad Hiarcs 12.1 on it now, but straight away it doesn't look good - evals -0.79 currently vs +0.77 before, but it is very early days. Will let it run for a while. But I really don't think e5 is the best move here
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Dann Corbit
Posts: 12792
Joined: Wed Mar 08, 2006 8:57 pm
Location: Redmond, WA USA

Re: Difficult Test Position: Positional Sacrifice

Post by Dann Corbit »

Alessandro Damiani wrote:From a German computer chess book (R. Knaak and others):

[d]rnbq1rk1/pp4bp/3p4/2pP3n/2P1Pp2/2NBB3/PPQ1N1PP/R3K2R w KQ - 0 1

Best move: e5 with follow-up e6 immobilising black's queen side.

I wonder if this can be solved with todays engines and hardware. Have fun!
Rybka given about 7 hours did not find it. However, the eval is steadily dropping.

Instead of following up with e6, why not take the pawn with the bishop first, and then move e6. At that point, our material will be down one pawn and we will have removed the last remnant of black's pawn shelter. Black will be forced to keep pieces tied up to protect his king.

Code: Select all

Analysis from Q:\epd\sub\e5.epd   
12/30/2008 3:59:42 AM Level: 25000 Seconds
Analyzing engine: Rybka 3

1) e5; c0 "follow-up wi 
    Searching move: e4-e5, e4-e6
    Best move (Rybka 3): Be3-f2
    Not found in: 6:56:40
      2	00:00	         759	16.536	+0.98	Be3f2
      3	00:00	         983	15.977	+0.96	Be3f2
      4	00:00	       1.600	26.006	+1.04	Be3f2
      5	00:00	       2.577	28.072	+0.85	Be3f2 Nb8d7
      6	00:00	      11.672	76.128	+0.95	Be3f2 Nb8d7 Rh1g1 Nd7e5
      7	00:00	      13.764	81.943	+0.95	Be3f2 Nb8d7 Rh1g1 Nd7e5
      8	00:00	      22.918	99.863	+0.89	Be3f2 Nb8d7 Rh1g1 Nd7e5 OOO
      9	00:00	      44.143	125.912	+0.78	Be3f2 Nb8d7 Rh1g1 Nd7e5 OOO Ne5g4 Rg1f1 Bg7e5
     10	00:01	     115.870	155.099	+0.70	Be3f2 Nb8d7 Rh1g1 Nd7e5 OOO Ne5g4 Rg1f1 Ng4xh2 Rf1h1
     11	00:02	     268.425	172.655	+0.76	Be3f2 Nb8d7 OOO Qd8g5 Kc1b1 Qg5xg2 Ne2c1 Nd7e5 Rh1g1 Qg2h3 Nc3b5
     12	00:02	     366.786	173.162	+0.76	Be3f2 Nb8d7 OOO Qd8g5 Kc1b1 Qg5xg2 Ne2c1 Nd7e5 Rh1g1 Qg2h3 Nc3b5
     13	00:03	     520.541	168.308	+0.76	Be3f2 Nb8d7 OOO Qd8g5 Kc1b1 Qg5xg2 Ne2c1 Nd7e5 Rh1g1 Qg2h3 Nc3b5
     14	00:07	   1.271.579	181.047	+0.76	Be3f2 Nb8d7 OOO Qd8g5 Kc1b1 Qg5xg2 Bf2h4 f4f3 Rd1g1 Qg2h3 Bh4e7 f3xe2 Bd3xe2 Rf8f2 Rg1g5 Nd7e5 Be7xd6 Ne5f3 Bd6xc5 Rf2xe2 Rg5xg7+ Nh5xg7 Qc2xe2 Nf3e5 Qe2f1 Qh3xf1+ Rh1xf1 Bc8g4 b2b3 Ne5f3 Bc5e3
     15	00:12	   2.090.707	182.001	+0.61	Be3f2 Nb8d7 OOO Qd8g5 Kc1b1 Nd7e5 Rd1g1 Qg5e7 Rg1f1 f4f3
     16	00:27	   5.081.208	195.042	+0.54	Be3f2 Nb8d7 OOO Qd8g5 Kc1b1 Nd7e5 Rd1g1 Qg5e7 Rg1f1 f4f3 g2xf3 Bc8h3 Rf1d1 Rf8xf3 Bf2e1 Ra8f8 Rh1g1 Kg8h8 Nc3b5 Rf3f7
     17	01:04	  12.414.437	197.259	+0.55	Be3f2 Nb8d7 OOO Qd8g5 Kc1b1 Nd7e5 Ne2c1 a7a6 Rd1g1 Bc8g4 Bd3f1 Qg5g6 Nc1b3 Nh5f6 h2h4 Nf6h5 Bf1e2
     18	04:25	  52.688.912	203.970	+0.47	Be3f2 Nb8d7 OOO Qd8g5 Kc1b1 Nd7e5 g2g3 f4f3 Ne2f4 Nh5xf4 Bf2e3 Ne5g6
     19	05:46	  69.583.571	205.761	+0.47	Be3f2 Nb8d7 OOO Qd8g5 Kc1b1 Nd7e5 g2g3 f4f3 Ne2f4 Nh5xf4 Bf2e3 Ne5g6
     20	12:23	 157.150.840	216.734	+0.43	Be3f2 Nb8d7 OOO Qd8g5 Kc1b1 Nd7e5 g2g3 f4f3 Ne2f4 Nh5xf4 Bf2e3 Ne5g6 g3xf4 Ng6xf4 Rh1g1 Qg5h5 Nc3b5 Nf4g2
     21	20:05	 252.630.671	214.647	+0.43	Be3f2 Nb8d7 OOO Qd8g5 Kc1b1 Nd7e5 g2g3 f4f3 Ne2f4 Nh5xf4 Bf2e3 Ne5g6 g3xf4 Ng6xf4 Rh1g1 Qg5h5 Nc3b5 Nf4g2
     22	1:05:32	 893.190.566	232.632	+0.37	Be3f2 Nb8d7 OOO Qd8g5 Kc1b1 Nd7e5 Rd1g1 Qg5e7 Ne2c1 Ne5xd3 Nc1xd3 Bg7xc3 Qc2xc3 Qe7xe4 g2g4 Nh5f6 Rg1e1 Qe4g6 Kb1a1 Nf6e4 Qc3c1 Ne4xf2 Nd3xf2 Ra8b8 Re1e4 f4f3 Re4e7 b7b5 Re7xa7 Rf8e8
     23	1:36:34	1.321.118.603	233.509	+0.37	Be3f2 Nb8d7 OOO Qd8g5 Kc1b1 Nd7e5 Rd1g1 Qg5e7 Ne2c1 Ne5xd3 Nc1xd3 Bg7xc3 Qc2xc3 Qe7xe4 g2g4 Nh5f6 Rg1e1 Qe4g6 Kb1a1 Nf6e4 Qc3c1 Ne4xf2 Nd3xf2 Ra8b8 Re1e4 f4f3 Re4e7 b7b5 Re7xa7 Rf8e8
     24	5:45:09	4.854.061,351	240.029	+0.27	Be3f2 Nb8d7 OOO Qd8g5 Kc1b1 Nd7e5 Rh1g1 Ne5g4 Rg1f1 Ng4xh2 Rf1h1 Nh2g4 Rd1f1 Ng4xf2 Rf1xf2 Bg7e5 Ne2g1 Nh5g3 Ng1f3 Qg5g7 Rh1e1 Bc8d7 Nf3xe5 Qg7xe5 Qc2b3 Ra8b8 Kb1a1 Ng3f5 Nc3e2
   12/30/2008 10:56:35 AM, Time for this analysis: 06:56:40, Rated time: 6:56:40

0 of 1 matching moves
12/30/2008 10:56:36 AM, Total time: 6:56:54 AM
Rated time: 6:56:40 = 25000 Seconds
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Spock

Re: Difficult Test Position: Positional Sacrifice

Post by Spock »

Quad Hiarcs is now at -0.11 at depth 20
I'll give it the same 10 hrs as I gave on the original posiiton, then that's it from me...
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Spock

Re: Difficult Test Position: Positional Sacrifice

Post by Spock »

Hiarcs' evaluation for white is slowly improving after the sacrifice


Code: Select all

  9/26	 0:00 	-1.00 	1...Nf6 (936.081) 1268
  9/26	 0:00 	-1.00 	1...Nf6 2.O-O Na6 3.a3 Bh6 4.Nf4 Bxf4 5.Rxf4 (941.850) 1268
 10/26	 0:00 	-0.75--	1...Nf6 2.O-O (1.166.875) 1213
 10/33	 0:01 	-0.57 	1...Nf6 2.O-O Na6 3.a3 Qc7 4.Nf4 Bh6 5.Qe2 Qb6 6.Qxe3 Qxb2 (1.344.161) 1196
 10/33	 0:01 	-0.57 	1...Bxc3+ (1.359.352) 1196
 10/33	 0:02 	-0.58 	1...Bxc3+ 2.Nxc3 Kg7 3.Bxh7 Qh4+ 4.g3 Qg4 5.Bd3 (3.286.381) 1334
 10/33	 0:02 	-0.59 	1...Kh8 (3.531.133) 1338
 10/33	 0:02 	-0.84 	1...Kh8 2.O-O-O Rf2 3.Rhf1 Rxg2 4.Bxh7 Bxc3 5.bxc3 (3.701.818) 1338
 11/33	 0:03 	-0.60 	1...Kh8 2.O-O-O Rf2 3.Rhf1 Qe7 4.Rxf2 exf2 5.Ne4 (5.174.415) 1358
 12/34	 0:07 	-0.85++	1...Kh8 (10.433.911) 1402
 12/34	 0:07 	-0.85 	1...Kh8 2.O-O-O Rf2 3.Rdf1 (11.178.049) 1399
 13/34	 0:11 	-0.78 	1...Kh8 2.O-O-O Rf2 3.Ne4 Rxg2 4.Rdg1 Rxg1+ 5.Rxg1 h6 6.N4c3 Qh4 7.Nb5 Qe7 8.Bg6 Nf6 9.Qd3 a6 (17.254.545) 1441
 14/36	 0:20 	-0.53--	1...Kh8 2.O-O-O (29.540.998) 1469
 14/36	 0:20 	-0.53 	1...Kh8 2.O-O-O Rf2 3.Ne4 Rxg2 4.Rdg1 Rxg1+ 5.Rxg1 h6 6.N4c3 Qh4 7.Nb5 Qe7 8.Bg6 Nf6 9.Qd3 a6 10.Na3 b5 (30.538.762) 1470
 14/36	 0:31 	-0.54 	1...Bxc3+ (46.666.619) 1475
 14/40	 0:52 	-0.55 	1...Bxc3+ 2.Nxc3 Na6 3.a3 Kh8 4.g3 Qg5 5.Ne4 Qe5 6.Qc3 (78.029.164) 1488
 15/45	 2:08 	-0.51 	1...Bxc3+ 2.bxc3 Qh4+ 3.g3 Qe7 4.Bf5 Nd7 5.exd7 (188.551.513) 1468
 15/45	 2:10 	-0.52 	1...Kh8 (190.925.994) 1467
 15/45	 2:33 	-0.79 	1...Kh8 2.Bf5 Qg5 (225.208.805) 1466
 16/45	 3:13 	-0.73 	1...Kh8 2.Bf5 Be5 3.g3 Qg5 4.Bxh7 Nf6 5.Bd3 Na6 6.O-O-O Nb4 7.Qb1 Nxd3+ (284.270.524) 1468
 17/45	 4:43 	-0.57 	1...Kh8 2.Bf5 Be5 3.O-O Qg5 4.Bxh7 Rf2 5.Rxf2 exf2+ 6.Kf1 Nf6 7.Ne4 Qh5 8.Nxf6 (415.642.922) 1465
 17/45	 7:08 	-0.58 	1...Rf2 (631.270.212) 1473
 17/45	 7:16 	-0.58 	1...Rf2 2.Bxh7+ Kh8 3.g3 Bxc3+ 4.bxc3 Qg5 5.O-O-O Nf6 6.Bd3 (642.570.621) 1471
 18/47	12:52 	-0.35 	1...Rf2 2.Bxh7+ Kh8 3.g3 Na6 4.Be4 Qg5 5.a3 Nf6 6.Nd1 (1.136.288.646) 1470
 18/47	13:11 	-0.36 	1...Kh8 (1.162.435.392) 1468
 18/47	15:40 	-0.43 	1...Kh8 2.Bf5 Qh4+ 3.g3 Qxc4 4.e7 Re8 5.Bxc8 Na6 6.O-O Raxc8 7.Qf5 Nb4 8.Qxh5 Rxe7 9.Rf4 (1.378.424.799) 1465
 18/49	16:51 	-0.44 	1...Bxc3+ (1.487.515.400) 1470
 18/52	25:24 	-0.44 	1...Bxc3+ 2.Nxc3 (2.272.078.607) 1490
 19/54	48:24 	-0.24 	1...Bxc3+ 2.Nxc3 Na6 3.Rf1 Kh8 4.Nd1 Rxf1+ 5.Bxf1 (4.392.505.395) 1512
 19/54	48:57 	-0.25 	1...Kh8 (4.439.833.510) 1511
 19/54	58:45 	-0.35 	1...Kh8 2.Bxh7 Rf2 3.g3 Na6 4.Be4 Qg5 5.a3 Nf6 6.Nd1 (5.319.581.383) 1508
 19/55	71:34 	-0.36 	1...Na6 (6.449.175.213) 1501
 19/55	82:30 	-0.36 	1...Na6 2.Bxh7+ Kh8 3.Bf5 (7.411.711.282) 1497
 20/55	96:32 	-0.11--	1...Na6 2.Bxh7+ (8.628.281.452) 1489
 20/62	119:33 	+0.03 	1...Na6 2.Bxh7+ Kh8 3.Bf5 Qg5 4.O-O (10.821.973.725) 1508
 20/62	120:34 	+0.02 	1...Kh8 (10.909.672.381) 1507
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User avatar
Dr.Wael Deeb
Posts: 9773
Joined: Wed Mar 08, 2006 8:44 pm
Location: Amman,Jordan

Re: Difficult Test Position: Positional Sacrifice

Post by Dr.Wael Deeb »

Spock wrote:Hiarcs' evaluation for white is slowly improving after the sacrifice


Code: Select all

  9/26	 0:00 	-1.00 	1...Nf6 (936.081) 1268
  9/26	 0:00 	-1.00 	1...Nf6 2.O-O Na6 3.a3 Bh6 4.Nf4 Bxf4 5.Rxf4 (941.850) 1268
 10/26	 0:00 	-0.75--	1...Nf6 2.O-O (1.166.875) 1213
 10/33	 0:01 	-0.57 	1...Nf6 2.O-O Na6 3.a3 Qc7 4.Nf4 Bh6 5.Qe2 Qb6 6.Qxe3 Qxb2 (1.344.161) 1196
 10/33	 0:01 	-0.57 	1...Bxc3+ (1.359.352) 1196
 10/33	 0:02 	-0.58 	1...Bxc3+ 2.Nxc3 Kg7 3.Bxh7 Qh4+ 4.g3 Qg4 5.Bd3 (3.286.381) 1334
 10/33	 0:02 	-0.59 	1...Kh8 (3.531.133) 1338
 10/33	 0:02 	-0.84 	1...Kh8 2.O-O-O Rf2 3.Rhf1 Rxg2 4.Bxh7 Bxc3 5.bxc3 (3.701.818) 1338
 11/33	 0:03 	-0.60 	1...Kh8 2.O-O-O Rf2 3.Rhf1 Qe7 4.Rxf2 exf2 5.Ne4 (5.174.415) 1358
 12/34	 0:07 	-0.85++	1...Kh8 (10.433.911) 1402
 12/34	 0:07 	-0.85 	1...Kh8 2.O-O-O Rf2 3.Rdf1 (11.178.049) 1399
 13/34	 0:11 	-0.78 	1...Kh8 2.O-O-O Rf2 3.Ne4 Rxg2 4.Rdg1 Rxg1+ 5.Rxg1 h6 6.N4c3 Qh4 7.Nb5 Qe7 8.Bg6 Nf6 9.Qd3 a6 (17.254.545) 1441
 14/36	 0:20 	-0.53--	1...Kh8 2.O-O-O (29.540.998) 1469
 14/36	 0:20 	-0.53 	1...Kh8 2.O-O-O Rf2 3.Ne4 Rxg2 4.Rdg1 Rxg1+ 5.Rxg1 h6 6.N4c3 Qh4 7.Nb5 Qe7 8.Bg6 Nf6 9.Qd3 a6 10.Na3 b5 (30.538.762) 1470
 14/36	 0:31 	-0.54 	1...Bxc3+ (46.666.619) 1475
 14/40	 0:52 	-0.55 	1...Bxc3+ 2.Nxc3 Na6 3.a3 Kh8 4.g3 Qg5 5.Ne4 Qe5 6.Qc3 (78.029.164) 1488
 15/45	 2:08 	-0.51 	1...Bxc3+ 2.bxc3 Qh4+ 3.g3 Qe7 4.Bf5 Nd7 5.exd7 (188.551.513) 1468
 15/45	 2:10 	-0.52 	1...Kh8 (190.925.994) 1467
 15/45	 2:33 	-0.79 	1...Kh8 2.Bf5 Qg5 (225.208.805) 1466
 16/45	 3:13 	-0.73 	1...Kh8 2.Bf5 Be5 3.g3 Qg5 4.Bxh7 Nf6 5.Bd3 Na6 6.O-O-O Nb4 7.Qb1 Nxd3+ (284.270.524) 1468
 17/45	 4:43 	-0.57 	1...Kh8 2.Bf5 Be5 3.O-O Qg5 4.Bxh7 Rf2 5.Rxf2 exf2+ 6.Kf1 Nf6 7.Ne4 Qh5 8.Nxf6 (415.642.922) 1465
 17/45	 7:08 	-0.58 	1...Rf2 (631.270.212) 1473
 17/45	 7:16 	-0.58 	1...Rf2 2.Bxh7+ Kh8 3.g3 Bxc3+ 4.bxc3 Qg5 5.O-O-O Nf6 6.Bd3 (642.570.621) 1471
 18/47	12:52 	-0.35 	1...Rf2 2.Bxh7+ Kh8 3.g3 Na6 4.Be4 Qg5 5.a3 Nf6 6.Nd1 (1.136.288.646) 1470
 18/47	13:11 	-0.36 	1...Kh8 (1.162.435.392) 1468
 18/47	15:40 	-0.43 	1...Kh8 2.Bf5 Qh4+ 3.g3 Qxc4 4.e7 Re8 5.Bxc8 Na6 6.O-O Raxc8 7.Qf5 Nb4 8.Qxh5 Rxe7 9.Rf4 (1.378.424.799) 1465
 18/49	16:51 	-0.44 	1...Bxc3+ (1.487.515.400) 1470
 18/52	25:24 	-0.44 	1...Bxc3+ 2.Nxc3 (2.272.078.607) 1490
 19/54	48:24 	-0.24 	1...Bxc3+ 2.Nxc3 Na6 3.Rf1 Kh8 4.Nd1 Rxf1+ 5.Bxf1 (4.392.505.395) 1512
 19/54	48:57 	-0.25 	1...Kh8 (4.439.833.510) 1511
 19/54	58:45 	-0.35 	1...Kh8 2.Bxh7 Rf2 3.g3 Na6 4.Be4 Qg5 5.a3 Nf6 6.Nd1 (5.319.581.383) 1508
 19/55	71:34 	-0.36 	1...Na6 (6.449.175.213) 1501
 19/55	82:30 	-0.36 	1...Na6 2.Bxh7+ Kh8 3.Bf5 (7.411.711.282) 1497
 20/55	96:32 	-0.11--	1...Na6 2.Bxh7+ (8.628.281.452) 1489
 20/62	119:33 	+0.03 	1...Na6 2.Bxh7+ Kh8 3.Bf5 Qg5 4.O-O (10.821.973.725) 1508
 20/62	120:34 	+0.02 	1...Kh8 (10.909.672.381) 1507
So at it's best,the e5 move leads to a draw position bearing in mind that you play error free 8-)
Thanks Ray for the cpu time....
_No one can hit as hard as life.But it ain’t about how hard you can hit.It’s about how hard you can get hit and keep moving forward.How much you can take and keep moving forward….
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Spock

Re: Difficult Test Position: Positional Sacrifice

Post by Spock »

Dr.Wael Deeb wrote:
So at it's best,the e5 move leads to a draw position bearing in mind that you play error free 8-)
Thanks Ray for the cpu time....
It just got a little worse again - I'll leave it overnight. But, my opinion is, based on what I've seen so far, the sacrifice is not the best thing to do

Code: Select all

  9/26	 0:00 	-1.00 	1...Nf6 (936.081) 1268
  9/26	 0:00 	-1.00 	1...Nf6 2.O-O Na6 3.a3 Bh6 4.Nf4 Bxf4 5.Rxf4 (941.850) 1268
 10/26	 0:00 	-0.75--	1...Nf6 2.O-O (1.166.875) 1213
 10/33	 0:01 	-0.57 	1...Nf6 2.O-O Na6 3.a3 Qc7 4.Nf4 Bh6 5.Qe2 Qb6 6.Qxe3 Qxb2 (1.344.161) 1196
 10/33	 0:01 	-0.57 	1...Bxc3+ (1.359.352) 1196
 10/33	 0:02 	-0.58 	1...Bxc3+ 2.Nxc3 Kg7 3.Bxh7 Qh4+ 4.g3 Qg4 5.Bd3 (3.286.381) 1334
 10/33	 0:02 	-0.59 	1...Kh8 (3.531.133) 1338
 10/33	 0:02 	-0.84 	1...Kh8 2.O-O-O Rf2 3.Rhf1 Rxg2 4.Bxh7 Bxc3 5.bxc3 (3.701.818) 1338
 11/33	 0:03 	-0.60 	1...Kh8 2.O-O-O Rf2 3.Rhf1 Qe7 4.Rxf2 exf2 5.Ne4 (5.174.415) 1358
 12/34	 0:07 	-0.85++	1...Kh8 (10.433.911) 1402
 12/34	 0:07 	-0.85 	1...Kh8 2.O-O-O Rf2 3.Rdf1 (11.178.049) 1399
 13/34	 0:11 	-0.78 	1...Kh8 2.O-O-O Rf2 3.Ne4 Rxg2 4.Rdg1 Rxg1+ 5.Rxg1 h6 6.N4c3 Qh4 7.Nb5 Qe7 8.Bg6 Nf6 9.Qd3 a6 (17.254.545) 1441
 14/36	 0:20 	-0.53--	1...Kh8 2.O-O-O (29.540.998) 1469
 14/36	 0:20 	-0.53 	1...Kh8 2.O-O-O Rf2 3.Ne4 Rxg2 4.Rdg1 Rxg1+ 5.Rxg1 h6 6.N4c3 Qh4 7.Nb5 Qe7 8.Bg6 Nf6 9.Qd3 a6 10.Na3 b5 (30.538.762) 1470
 14/36	 0:31 	-0.54 	1...Bxc3+ (46.666.619) 1475
 14/40	 0:52 	-0.55 	1...Bxc3+ 2.Nxc3 Na6 3.a3 Kh8 4.g3 Qg5 5.Ne4 Qe5 6.Qc3 (78.029.164) 1488
 15/45	 2:08 	-0.51 	1...Bxc3+ 2.bxc3 Qh4+ 3.g3 Qe7 4.Bf5 Nd7 5.exd7 (188.551.513) 1468
 15/45	 2:10 	-0.52 	1...Kh8 (190.925.994) 1467
 15/45	 2:33 	-0.79 	1...Kh8 2.Bf5 Qg5 (225.208.805) 1466
 16/45	 3:13 	-0.73 	1...Kh8 2.Bf5 Be5 3.g3 Qg5 4.Bxh7 Nf6 5.Bd3 Na6 6.O-O-O Nb4 7.Qb1 Nxd3+ (284.270.524) 1468
 17/45	 4:43 	-0.57 	1...Kh8 2.Bf5 Be5 3.O-O Qg5 4.Bxh7 Rf2 5.Rxf2 exf2+ 6.Kf1 Nf6 7.Ne4 Qh5 8.Nxf6 (415.642.922) 1465
 17/45	 7:08 	-0.58 	1...Rf2 (631.270.212) 1473
 17/45	 7:16 	-0.58 	1...Rf2 2.Bxh7+ Kh8 3.g3 Bxc3+ 4.bxc3 Qg5 5.O-O-O Nf6 6.Bd3 (642.570.621) 1471
 18/47	12:52 	-0.35 	1...Rf2 2.Bxh7+ Kh8 3.g3 Na6 4.Be4 Qg5 5.a3 Nf6 6.Nd1 (1.136.288.646) 1470
 18/47	13:11 	-0.36 	1...Kh8 (1.162.435.392) 1468
 18/47	15:40 	-0.43 	1...Kh8 2.Bf5 Qh4+ 3.g3 Qxc4 4.e7 Re8 5.Bxc8 Na6 6.O-O Raxc8 7.Qf5 Nb4 8.Qxh5 Rxe7 9.Rf4 (1.378.424.799) 1465
 18/49	16:51 	-0.44 	1...Bxc3+ (1.487.515.400) 1470
 18/52	25:24 	-0.44 	1...Bxc3+ 2.Nxc3 (2.272.078.607) 1490
 19/54	48:24 	-0.24 	1...Bxc3+ 2.Nxc3 Na6 3.Rf1 Kh8 4.Nd1 Rxf1+ 5.Bxf1 (4.392.505.395) 1512
 19/54	48:57 	-0.25 	1...Kh8 (4.439.833.510) 1511
 19/54	58:45 	-0.35 	1...Kh8 2.Bxh7 Rf2 3.g3 Na6 4.Be4 Qg5 5.a3 Nf6 6.Nd1 (5.319.581.383) 1508
 19/55	71:34 	-0.36 	1...Na6 (6.449.175.213) 1501
 19/55	82:30 	-0.36 	1...Na6 2.Bxh7+ Kh8 3.Bf5 (7.411.711.282) 1497
 20/55	96:32 	-0.11--	1...Na6 2.Bxh7+ (8.628.281.452) 1489
 20/62	119:33 	+0.03 	1...Na6 2.Bxh7+ Kh8 3.Bf5 Qg5 4.O-O (10.821.973.725) 1508
 20/62	120:34 	+0.02 	1...Kh8 (10.909.672.381) 1507
 20/62	140:20 	-0.58 	1...Kh8 2.Bf5 Qh4+ 3.g3 Qxc4 4.O-O Na6 5.Bxh7 Rf2 6.Rxf2 exf2+ 7.Kg2 Qg4 8.Qf5 Qxf5 (12.659.523.532) 1503
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Dann Corbit
Posts: 12792
Joined: Wed Mar 08, 2006 8:57 pm
Location: Redmond, WA USA

Re: Difficult Test Position: Positional Sacrifice

Post by Dann Corbit »

Rybka 3 just gave me a fail high on this position and is doing a research:
[d]rnbq1rk1/pp4bp/3p4/2pPP2n/2P5/2NBp3/PPQ1N1PP/R3K2R w KQ -

I will report the analysis tomorrow.
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tano-urayoan
Posts: 638
Joined: Thu Aug 30, 2007 8:23 pm
Location: San Juan, Puerto Rico

Re: Difficult Test Position: Positional Sacrifice

Post by tano-urayoan »

Maybe an IDEA session will help with this analysis, as the arising position is complex and beyond engines scope. This is just my hypothesis.
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