Six years ago the board was abuzz with excitement over this positional sacrifice played by Junior against Brutus:
[d] r1r5/3nbpk1/4qnp1/4p1Bp/1pN1P3/1PP2Q2/4N1PP/3R1R1K b - - bm Rxc4
None found it then, but which engines now play Junior's ...Rxc4? Is it the hands-down best move?
Test position revisited
Moderator: Ras
-
zullil
- Posts: 6442
- Joined: Tue Jan 09, 2007 12:31 am
- Location: PA USA
- Full name: Louis Zulli
Re: Test position revisited
Crafty-22.7 likes it:Vladimir Xern wrote:Six years ago the board was abuzz with excitement over this positional sacrifice played by Junior against Brutus:
[d] r1r5/3nbpk1/4qnp1/4p1Bp/1pN1P3/1PP2Q2/4N1PP/3R1R1K b - - bm Rxc4
None found it then, but which engines now play Junior's ...Rxc4? Is it the hands-down best move?
Code: Select all
Black(1): go
time limit 5:00 (+0.00) (5:00)
depth time score variation (1)
starting thread 1
8 0.14 1.00 bxc3 Nxc3 Ra6 Nd5 Nc5 Bxf6+ Bxf6 b4
Nd7
8 0.22 0.72 Rcb8 cxb4 Kh8 Rxd7 Nxd7 Bxe7 Qxe7 Qxf7
8 0.40 0.67 Rab8 cxb4 Kh8 Rxd7 Nxd7 Bxe7 Qxe7 Qxf7
8 0.49 0.22 Rc6 Rc1 Kh8 Rfd1 Ra2 Ra1 Rca6 Rxa2
Rxa2 cxb4 Bxb4
8-> 0.50 0.22 Rc6 Rc1 Kh8 Rfd1 Ra2 Ra1 Rca6 Rxa2
Rxa2 cxb4 Bxb4 (s=5)
9 0.63 0.32 Rc6 Rc1 Kh8 Ra1 Rxa1 Rxa1 Nc5 Bxf6+
Qxf6 cxb4 Qxf3 gxf3 (s=4)
9 0.93 0.23 Ra6 cxb4 Bxb4 Rc1 Kh8 Rfd1 Ng4 Nc3
Ndf6 <HT>
9-> 0.93 0.23 Ra6 cxb4 Bxb4 Rc1 Kh8 Rfd1 Ng4 Nc3
Ndf6 <HT> (s=2)
10 1.14 0.23 Ra6 cxb4 Bxb4 Rc1 Kg8 Rfd1 Nh7 Bh6
Nhf6 Nc3
10-> 1.23 0.23 Ra6 cxb4 Bxb4 Rc1 Kg8 Rfd1 Nh7 Bh6
Nhf6 Nc3
11 1.58 0.19 Ra6 cxb4 Bxb4 Rc1 Kg8 Rfd1 Ng4 Nc3
Bc5 Rc2 Bd4 <HT>
11-> 1.83 0.19 Ra6 cxb4 Bxb4 Rc1 Kg8 Rfd1 Ng4 Nc3
Bc5 Rc2 Bd4 <HT> (s=2)
12 2.40 0.33 Ra6 cxb4 Bxb4 Rc1 Qg4 Qxg4 hxg4 Ng3
Ra2 Nxe5 Rxc1 Bxf6+ Nxf6 Rxc1
12-> 5.25 0.33 Ra6 cxb4 Bxb4 Rc1 Qg4 Qxg4 hxg4 Ng3
Ra2 Nxe5 Rxc1 Bxf6+ Nxf6 Rxc1 (s=4)
13 7.15 0.17 Ra6 cxb4 Bxb4 Rc1 Qg4 Qxg4 Nxg4 Rcd1
Ndf6 Ng3 Bc5 Rd2 Bd4 (s=3)
13-> 7.64 0.17 Ra6 cxb4 Bxb4 Rc1 Qg4 Qxg4 Nxg4 Rcd1
Ndf6 Ng3 Bc5 Rd2 Bd4
14 11.40 0.39 Ra6 cxb4 Bxb4 Ne3 Ra3 Bxf6+ Nxf6 Qxf6+
Qxf6 Rxf6 Kxf6 Nd5+ Kg5 Nxb4 Rxb3 Nd5
Rb2
14 18.53 0.24 Rxc4 bxc4 b3 Nc1 Qxc4 Rxd7 Nxd7 Bxe7
b2 Qd3 Qe6 Bg5 bxc1=Q Rxc1
14-> 31.89 0.24 Rxc4 bxc4 b3 Nc1 Qxc4 Rxd7 Nxd7 Bxe7
b2 Qd3 Qe6 Bg5 bxc1=Q Rxc1 (s=3)
15 34.72 0.34 Rxc4 bxc4 b3 Nc1 Qxc4 Nxb3 Qxb3 Rxd7
Nxd7 Bxe7 Ra2 Bg5 Qe6 Rf2 Ra1+ Rf1
Rxf1+ Qxf1 (s=2)
15 42.00 0.29 Rab8 Rd5 Nxe4 Qxe4 Bxg5 Nd4 exd4 Qxe6
fxe6 Rxd7+ Kg8 cxd4 Rd8 Rff7 Rxd7 Rxd7
15-> 44.85 0.29 Rab8 Rd5 Nxe4 Qxe4 Bxg5 Nd4 exd4 Qxe6
fxe6 Rxd7+ Kg8 cxd4 Rd8 Rff7 Rxd7 Rxd7
(s=2)
16 1:29 0.24 Rab8 cxb4 Rxb4 Ng3 Kg8 Rd3 Rb7 Rfd1
Ra7 Rd5 Rc6 R5d2 Nc5 Rc2 Ng4 Bxe7 Qxe7
16 1:56 0.16 Rxc4 bxc4 b3 Nc1 Qxc4 Nxb3 Qxb3 Rxd7
Nxd7 Bxe7 Qe6 Bb4 Ra2 Rd1 Nf6 Bc5
16-> 2:00 0.16 Rxc4 bxc4 b3 Nc1 Qxc4 Nxb3 Qxb3 Rxd7
Nxd7 Bxe7 Qe6 Bb4 Ra2 Rd1 Nf6 Bc5 (s=2)
17 2:08 0.17 Rxc4 bxc4 b3 Nc1 Qxc4 Nxb3 Qxb3 Rxd7
Nxd7 Bxe7 Qe6 Bb4 Ra2 Rd1 Nf6 Bc5 h4
17-> 2:21 0.17 Rxc4 bxc4 b3 Nc1 Qxc4 Nxb3 Qxb3 Rxd7
Nxd7 Bxe7 Qe6 Bb4 Ra2 Rd1 Nf6 Bc5 h4
(s=2)
18 2:40 0.15 Rxc4 bxc4 b3 Nc1 Qxc4 Nxb3 Qxb3 Rxd7
Nxd7 Bxe7 Qe6 Bg5 Ra2 Be3 Rc2 Rd1 h4
Bf2
18-> 3:05 0.15 Rxc4 bxc4 b3 Nc1 Qxc4 Nxb3 Qxb3 Rxd7
Nxd7 Bxe7 Qe6 Bg5 Ra2 Be3 Rc2 Rd1 h4
Bf2 (s=2)
19 3:56 0.10 Rxc4 bxc4 b3 Nc1 Qxc4 Nxb3 Qxb3 Rxd7
Nxd7 Bxe7 Qe6 Bg5 Ra2 Be3 Rb2 Rd1 Nf6
Bc5 h4
19-> 4:26 0.10 Rxc4 bxc4 b3 Nc1 Qxc4 Nxb3 Qxb3 Rxd7
Nxd7 Bxe7 Qe6 Bg5 Ra2 Be3 Rb2 Rd1 Nf6
Bc5 h4
time=5:00 mat=0 n=1245458640 fh=95% nps=4.1M
terminating SMP processes.
Black(1): Rxc4
time used: 5:00
-
Ovyron
- Posts: 4562
- Joined: Tue Jul 03, 2007 4:30 am
Re: Test position revisited
Rybka 3 Dynamic approves:Vladimir Xern wrote:Is it the hands-down best move?
Code: Select all
Athlon 1.87Ghz
Engine: Rybka 3 Dynamic 1-cpu 32-bit (64 MB)
by Vasik Rajlich, Larry Kaufman
7.00 0:00 -0.23 1...Rxc4 2.bxc4 b3 3.Nc1 Nc5 4.Nd3 (13.898) 15
8.00 0:02 -0.27 1...Rxc4 2.bxc4 b3 3.Nc1 Qxc4 4.Nxb3 Qxb3 5.Rxd7 Nxd7 6.Bxe7 Qe6 7.Bg5 (41.094) 17
9.00 0:03 -0.19 1...Rxc4 2.bxc4 b3 3.Nc1 Qxc4 4.Nxb3 Qxb3 5.Rxd7 Nxd7 6.Bxe7 Qe6 7.Bg5 Ra2 (62.610) 17
10.00 0:07 -0.32 1...Rxc4 2.bxc4 b3 3.Nc1 Qxc4 4.Nxb3 Qxb3 5.Rxd7 Nxd7 6.Bxe7 Qe6 7.Bh4 Ra3 8.Kg1 (146.164) 19
11.00 0:14 -0.33 1...Rxc4 2.bxc4 b3 3.Nc1 Qxc4 4.Nxb3 Qxb3 5.Rxd7 Nxd7 6.Bxe7 Qe6 7.Bh4 Ra3 8.Kg1 Qc4 (288.434) 21
12.01 0:24 -0.28 1...Rxc4 2.bxc4 b3 3.Nc1 Qxc4 4.Nxb3 Qxb3 5.Rxd7 Nxd7 6.Bxe7 Qe6 7.Bb4 Qc4 8.Kg1 Ra6 9.Be7 (497.546) 21-
pijl
Re: Test position revisited
On a Core2 Duo (single CPU) 1.67Ghz, the latest version of the Baron considers Rxc4 from the start but switched a couple of times to different moves. In the end it stuck with Rxc4 though:Vladimir Xern wrote:Six years ago the board was abuzz with excitement over this positional sacrifice played by Junior against Brutus:
[d] r1r5/3nbpk1/4qnp1/4p1Bp/1pN1P3/1PP2Q2/4N1PP/3R1R1K b - - bm Rxc4
None found it then, but which engines now play Junior's ...Rxc4? Is it the hands-down best move?
Code: Select all
ply score time nodes pv
5& -0.311 0:00.18 47594 a8a2 c3b4 e7b4 e2g3 a2c2
5& -0.264 0:00.28 67854 c8c4 b3c4 b4b3 g5f6 d7f6 f3d3
5. -0.264 0:00.37 77078 c8c4 b3c4 b4b3 g5f6 d7f6 f3d3
6& -0.226 0:00.56 126858 c8c4 b3c4 b4b3 d1d3 b3b2 f1d1
6. -0.226 0:00.71 149069 c8c4 b3c4 b4b3 d1d3 b3b2 f1d1
7& -0.216 0:01.18 279714 c8c4 b3c4 b4b3 e2c1 b3b2 c1d3 e6b6
7. -0.216 0:01.43 330794 c8c4 b3c4 b4b3 e2c1 b3b2 c1d3 e6b6
8& -0.407 0:02.29 593146 c8c4 b3c4 b4b3 e2c1 b3b2 c1d3 a8a2 c4c5
8& -0.251 0:07.36 1965576 a8a2 c3b4 e7b4 d1d3 c8a8 e2g3 a2c2 f1d1
8. -0.251 0:08.45 2229191 a8a2 c3b4 e7b4 d1d3 c8a8 e2g3 a2c2 f1d1
9& -0.334 0:14.83 3982934 a8a2 c3b4 e7b4 e2c1 a2a8 c1d3 b4c3 f1f2 c3d4
9& -0.223 0:32.02 8564738 a8a6 c3b4 e7b4 e2g3 g7g8 f3e2 b4c3 g5e3 d7c5
9. -0.223 0:32.53 8698754 a8a6 c3b4 e7b4 e2g3 g7g8 f3e2 b4c3 g5e3 d7c5
10& -0.202 0:57.99 15677116 a8a6 c3b4 e7b4 c4e3 a6a2 e2c1 a2d2 e3c4 d2d1 f1d1
10. -0.202 1:01.14 16578854 a8a6 c3b4 e7b4 c4e3 a6a2 e2c1 a2d2 e3c4 d2d1 f1d1
11& -0.319 1:21.95 22576717 a8a6 c3b4 e7b4 c4e3 b4c5 e3d5 e6g4 f3d3 a6d6 g5f6 d7f6 e2c3 f6d5 c3d5
11& -0.253 1:37.92 27467009 c8c4 b3c4 b4b3 e2c1 d7c5 c1d3 c5d3 f3d3 f6g4 g5e7 e6e7
11. -0.253 1:46.49 29860288 c8c4 b3c4 b4b3 e2c1 d7c5 c1d3 c5d3 f3d3 f6g4 g5e7 e6e7
12& -0.387 2:21.90 40277357 c8c4 b3c4 b4b3 e2c1 d7c5 c1d3 c5d3 f3d3 a8a2 h2h3 e6b6 h1h2
12& -0.319 3:20.42 58380591 a8a6 c3b4 e7b4 c4e3 b4c5 e3d5 e6g4 f3d3 a6d6 g5f6 d7f6 e2c3 f6d5 c3d5
12. -0.319 3:52.24 67478086 a8a6 c3b4 e7b4 c4e3 b4c5 e3d5 e6g4 f3d3 a6d6 g5f6 d7f6 e2c3 f6d5 c3d5
13& -0.277 6:19.27 108953906 a8a6 c3b4 e7b4 c4e3 b4c5 e3d5 e6g4 f3d3 a6d6 g5f6 d7f6 b3b4 f6d5 b4c5
13& -0.069 8:46.83 153241679 c8c4 b3c4 b4b3 e2c1 e6c4 c1b3 c4b3 d1d7 f6d7 g5e7 b3e6 e7g5 f7f6
13. -0.069 9:17.39 161709418 c8c4 b3c4 b4b3 e2c1 e6c4 c1b3 c4b3 d1d7 f6d7 g5e7 b3e6 e7g5 f7f6
14& -0.055 12:16.84 215763673 c8c4 b3c4 b4b3 e2c1 e6c4 c1b3 c4b3 d1d7 f6d7 g5e7 b3e6 e7h4 f7f6 c3c4 e6c4 h4f6 g7h7
14. -0.055 13:15.00 232519650 c8c4 b3c4 b4b3 e2c1 e6c4 c1b3 c4b3 d1d7 f6d7 g5e7 b3e6 e7h4 f7f6 c3c4 e6c4 h4f6 g7h7
15& -0.127 20:17.42 355992852 c8c4 b3c4 b4b3 d1d5 b3b2 d5b5 a8a2 c4c5 f6e4 f3e4 e7g5 f1b1 f7f5 e4b7 g5e7 b5b2 d7c5
15. -0.127 23:40.54 413751071 c8c4 b3c4 b4b3 d1d5 b3b2 d5b5 a8a2 c4c5 f6e4 f3e4 e7g5 f1b1 f7f5 e4b7 g5e7 b5b2 d7c5