Position from Hiarcs8x vs Rybka 3

[kgburcham]

Hiarcs8x - Rybka, ICC tourney

[d] 8/8/p7/bp6/3N1k1p/4pP1P/2K3p1/8 b - - 0 1

Zappa Mexico II
14/47 0:03 -M12 1...Bb6 2.Ne2+ Kxf3 3.Kd3 Kf2 4.Nf4

Glaurung
20.01 0:06 -M12 1...Bb6 2.Ne2+ Kxf3 3.Kd3 Kf2 4.Nf4

Deep Hiarcs Paderborn 2007:
91...Bb6 92.Ne2+ Kxf3 93.Kd3 Kf2 94.Nf4 g1Q (-#12) Depth: 20/35 00:00:09

Rybka 2.3.2a mp (Fritz)
91...g1N 92.Kd3 Nxh3 93.Nc6 Bb6 94.Kc2
-+ (-10.43) Depth: 9 00:00:00 141kN
91...g1N 92.Kd3 Nxh3 93.Ke2 Bb6 94.Nb3 Ng1+ 95.Ke1
-+ (-10.72) Depth: 10 00:00:01 536kN
91...g1N 92.Kd3 Nxh3 93.Kc2 Bb6 94.Nc6 Kxf3 95.Ne5+ Ke4 96.Nf7
-+ (-11.65) Depth: 11 00:00:02 1028kN
91...g1N 92.Kd3 Nxh3 93.Kc2 Bb6 94.Nc6 Kxf3 95.Ne5+ Ke4 96.Nd3 e2 97.Kd2
-+ (-11.89) Depth: 12 00:00:04 2233kN
91...g1N 92.Kd3 Nxh3 93.Kc2 Bb6 94.Nc6 Kxf3 95.Ne5+ Ke4 96.Nd3 e2 97.Kd2 Be3+ 98.Ke1
-+ (-12.35) Depth: 13 00:00:08 4623kN
91...g1N 92.Kd1 Nxh3 93.Ne2+ Kxf3 94.Nd4+ Ke4 95.Nb3 Bc3 96.Nc1 Kf3
-+ (-16.28) Depth: 14 00:01:31 60319kN
91...g1N 92.Kd1 Nxh3 93.Kc1 Bb6 94.Nc2 Ng1 95.Nb4 e2 96.Nd3+ Ke3 97.Ne1 Nxf3 98.Nc2+
-+ (-15.75) Depth: 15 00:02:57 120mN
91...g1N 92.Kd3 Nxh3 93.Nc2 Kxf3 94.Nd4+ Kf2
-+ (-17.08) Depth: 16 00:05:44 233mN, tb=1
91...g1N 92.Kd3 Nxh3 93.Nc2 Kxf3 94.Kd4 Nf2 95.Kc5 e2 96.Nd4+ Ke3 97.Nxe2 Kxe2 98.Kc6
-+ (-18.27) Depth: 17 00:11:19 439mN, tb=5


Rybka 2.3.2a mp x64 (Shredder)
11.00 0:02 -11.61 1...g1N 2.Kd3 Nxh3 3.Kc2 Bb6 4.Nc6 Kxf3 5.Ne5+ Ke4 6.Nd3 (1.210.953) 574
12.01 0:04 -11.89 1...g1N 2.Kd3 Nxh3 3.Kc2 Bb6 4.Nc6 Kxf3 5.Ne5+ Ke4 6.Nd3 e2 7.Kd2 (2.459.992) 579
13.01 0:08 -12.35 1...g1N 2.Kd3 Nxh3 3.Kc2 Bb6 4.Nc6 Kxf3 5.Ne5+ Ke4 6.Nd3 e2 7.Kd2 Be3+ 8.Ke1 (4.648.376) 576
14.01 1:11 -15.68 1...g1N 2.Kd3 Nxh3 3.Ke2 Bb6 4.Nc2 Ng1+ 5.Kf1 e2+ 6.Kg2 Nxf3 7.Kh3 b4 8.Nxb4 (47.182.944) 678
15.01 2:43 -15.68 1...g1N 2.Kd3 Nxh3 3.Ke2 Bb6 4.Nc2 Ng1+ 5.Kf1 e2+ 6.Kg2 Nxf3 7.Kh3 b4 8.Nxb4 (111.609.256) 697
16.01 4:56 -15.96 1...g1N 2.Kd3 Nxh3 3.Ke2 Bb6 4.Nc2 Ng1+ 5.Kf1 e2+ 6.Kg2 Nxf3 7.Kh3 b4 8.Nxb4 (205.552.704) 708
17.01 15:11 -18.27 1...g1N 2.Kd3 Nxh3 3.Nc2 Kxf3 4.Kd4 Nf2 5.Kc5 e2 6.Nd4+ Ke3 7.Nxe2 Kxe2 8.Kc6 (564.409.091) 633
18.01 21:39 -18.27 1...g1N 2.Kd3 Nxh3 3.Nc2 Kxf3 4.Kd4 Nf2 5.Kc5 e2 6.Nd4+ Ke3 7.Nxe2 Kxe2 8.Kc6 (800.585.503) 631

[Vinvin]

Rybka preferes promotion over mate

[M ANSARI]

Strange ... what hardware is that? On my Quad, Knight promotion is fourth choice right away and b4 is seen as best and Bb4 second best with both scoring big or greater than +20. Maybe Rybka also has a sadistic factor?

[M ANSARI]

OK I see ... I have multi pv on ... on single pv it does like the Knight promotion. Rybka Winfinder finds the mate quite quickly though, I guess normal Rybka has some code which looks differently for a win ... for eg. putting more pressure on the pawn being protected by the Knight. Although this is not best here, I guess overall it is a much better setting for overall play in general. Promoting to a Knight still wins easily.