Test Position

[yanquis1972]

strangely, running the position yet again with the same engine & hash i find it even one ply earlier than your search:


New game
2r3k1/1q1rbpp1/p2p1n2/nppPpPN1/8/1PP1B2P/P1BQ1P2/5KRR w - - 0 1

Analysis by Rybka 4 x64:

1.Be4 Rdd8 2.f3 Re8 3.Kg2 Nxe4 4.fxe4 Bf6 5.Nf3 Kh8
= (0.08) Depth: 6 00:00:00 2kN
1.Be4 Rdd8 2.f3 Re8 3.Kg2 Nxe4 4.fxe4 Bf6 5.Nf3 Kh8 6.b4
= (0.08) Depth: 7 00:00:00 3kN
1.Ne4 Kh8 2.Nxf6 Bxf6 3.Kg2
= (0.20 ++) Depth: 7 00:00:00 6kN
1.Ne4 Nxe4 2.Bxe4 Rdd8 3.Kg2 Bf6 4.Qe2 Re8 5.Kh2 Qc7 6.b4
+/= (0.31) Depth: 7 00:00:00 10kN
1.Ne4 Nxe4 2.Bxe4 Rdd8 3.Rg4
+/= (0.43 ++) Depth: 8 00:00:00 17kN
1.Ne4 Nxe4 2.Bxe4 Rdd8 3.Rg4
+/= (0.58 ++) Depth: 8 00:00:00 27kN
1.Ne4 Nxe4 2.Bxe4 f6 3.Rg6 b4 4.Rhg1 Bd8 5.Kg2 Kh8
+/- (0.81) Depth: 8 00:00:00 44kN
1.Ne4 Nxe4 2.Bxe4 f6 3.Rg6 b4 4.Rhg1 Bd8 5.c4 Rcc7 6.Kg2 Kh8
+/- (0.91) Depth: 9 00:00:00 70kN
1.Ne4 Nxe4 2.Bxe4 f6 3.Rg6 Rf8 4.Rhg1 Bd8 5.Kg2 Bb6 6.Qe2 Rfd8 7.Kh2 c4
+/- (0.94) Depth: 10 00:00:01 120kN
1.Ne4 Nxe4 2.Bxe4 f6 3.Rg6 Rf8 4.Rhg1 Bd8 5.Kg2 Bb6 6.Qe2 Rfd8 7.Kh2 c4
+/- (0.94) Depth: 11 00:00:02 157kN
1.Ne6 fxe6 2.fxe6 Rdd8 3.Rxg7+ Kxg7 4.Bh6+ Kh8[] 5.Bg7+[] Kg8[] 6.Qh6[]
+/- (1.06 ++) Depth: 11 00:00:04 321kN
1.Ne6 fxe6 2.fxe6 Rdd8 3.Rxg7+ Kxg7 4.Bh6+ Kh8[] 5.Bg7+ Kg8[] 6.Qh6
+/- (1.21 ++) Depth: 11 00:00:04 391kN
1.Ne6 g6 2.Ng5 Qxd5 3.fxg6 fxg6 4.Bxg6 Qxd2 5.Bxd2[] Ra7 6.Bf5 Rca8 7.Ne6+ Kf7 8.Rg7+ Ke8 9.Rhg1 Nc6 10.Ke2 d5 11.h4
+- (1.44) Depth: 11 00:00:06 529kN
1.Ne6 g6 2.Ng5 Qxd5 3.fxg6 fxg6 4.Bxg6[] Qxd2 5.Bxd2[] Ra7 6.Bf5 Rca8 7.Ne6+ Kf7 8.Rg7+ Ke8 9.Rhg1 Nc6 10.Bg5 Nd8 11.Bxf6 Nxe6 12.Bg6+
+- (1.56 ++) Depth: 12 00:00:08 670kN
1.Ne6 g6 2.Ng5 Qxd5 3.fxg6 fxg6 4.Bxg6[] Qxd2 5.Bxd2[] Ra7 6.Bf5 Rca8 7.Ne6+ Kf7 8.Rg7+ Ke8 9.Rhg1 Nc6 10.Bg5 Nd8 11.Bxf6 Nxe6 12.Bg6+
+- (1.71 ++) Depth: 12 00:00:11 891kN


is there some sort of randomness variable in R4??? iirc all 1-core R3 results could be duplicated across all hardware. both of my runs were using 100% vanilla settings.

[Albert Silver]

i notice you are using DR4x64 1 cpu -- for some reason i have found the results are not consistent between the engines, although just to double check what hash were you using?

Ok, I tried with the normal Rybka 4 x64 (1 GB Hash), and the result was much the same:

Analysis by Rybka 4 x64:

1.Be4 Rdd8 2.f3 Re8 3.Kg2 Nxe4 4.fxe4 Bf6 5.Nf3 Kh8
= (0.08) Depth: 6 00:00:00 2kN
1.Be4 Rdd8 2.f3 Re8 3.Kg2 Nxe4 4.fxe4 Bf6 5.Nf3 Kh8 6.b4
= (0.08) Depth: 7 00:00:00 3kN
1.Ne4 Kh8 2.Nxf6 Bxf6 3.Kg2
= (0.20) Depth: 7 00:00:00 6kN
1.Ne4 Nxe4 2.Bxe4 Rdd8 3.Kg2 Bf6 4.Qe2 Re8 5.Kh2 Qc7 6.b4
+/= (0.31) Depth: 7 00:00:00 10kN
1.Ne4 Nxe4 2.Bxe4 Rdd8 3.Rg4
+/= (0.43) Depth: 8 00:00:00 17kN
1.Ne4 Nxe4 2.Bxe4 Kf8 3.Rg4 Bf6 4.Rhg1 b4 5.Kg2 c4 6.Bf3 cxb3 7.Rxb4
+/= (0.51) Depth: 8 00:00:00 22kN
1.Ne4 Nxe4 2.Bxe4 Kf8 3.Rxg7 Kxg7 4.Rg1+ Kh8 5.Qe2
+/= (0.63) Depth: 9 00:00:00 42kN
1.Ne4 Nxe4 2.Bxe4 Kf8 3.Rxg7 Kxg7 4.Rg1+ Kh8 5.Qe2
+/- (0.78) Depth: 9 00:00:00 64kN
1.Ne4 Nxe4 2.Bxe4 Bf6 3.Bg5 Kf8 4.Bxf6 gxf6 5.h4 Ke7 6.h5 b4 7.h6 bxc3 8.Qxc3 Qb5+ 9.Ke1 Rdd8 10.h7 Rh8 11.Rg7 c4
+/- (0.91) Depth: 9 00:00:01 83kN
1.Ne4 Nxe4 2.Bxe4 Bf6 3.Bg5 Kf8 4.Bxf6 gxf6 5.h4 Ke7 6.h5 b4 7.h6 c4 8.h7 Rdd8 9.cxb4 c3 10.Qe2 Qxb4 11.Rg7 Rh8 12.Kg2
+/- (0.85) Depth: 10 00:00:01 112kN
1.Ne4 Nxe4 2.Bxe4 f6 3.Rg6 Bd8 4.Rhg1 Rf7 5.Qe2 b4 6.c4
+/- (0.90) Depth: 11 00:00:02 190kN
1.Ne4 Nxe4 2.Bxe4 f6 3.h4 Bf8 4.Kg2 Kh8
+/- (1.02) Depth: 12 00:00:04 409kN
1.Ne4 Nxe4 2.Bxe4 f6 3.h4 Kf7 4.h5 Rh8 5.h6 gxh6 6.Rxh6 Rdd8 7.Ke2 Rxh6 8.Bxh6 Rh8 9.Kd3 b4 10.cxb4 Qb5+ 11.Kc2 Qxb4 12.Qxb4 cxb4 13.Rg7+
+/- (1.15) Depth: 12 00:00:06 636kN
1.Ne6 fxe6 2.fxe6 Rdd8 3.Bxc5 dxc5 4.Rxg7+ Kf8 5.Rf7+ Ke8 6.Bg6
+/- (1.17) Depth: 12 00:00:08 858kN
1.Ne6 fxe6 2.fxe6 Rdd8 3.Bxc5 Bf8 4.Bb4 Qxd5 5.Qxd5 Nxd5 6.Bxa5 Re8 7.Bg6 Re7 8.Bf7+ Rxf7 9.exf7+ Kxf7 10.Rg3 Nf4 11.Ke1 d5 12.Rhg1 Ke6 13.Kd2 Bc5 14.Rxg7 Bxf2 15.Rg8 Rc5
+- (1.57) Depth: 12 00:00:10 1044kN
1.Ne6 fxe6 2.fxe6 Rdd8 3.Bxc5 Bf8 4.Bb4 Qxd5 5.Qxd5 Nxd5 6.Bxa5 Re8 7.Bg6 Re7 8.Bf7+ Rxf7 9.exf7+ Kxf7 10.Rg3 Nf4 11.Ke1 d5 12.Rhg1 Ke6 13.Kd2 Bc5 14.Rxg7 Bxf2 15.Rg8
+- (1.92) Depth: 12 00:00:16 1755kN