Author: Uri Blass
Date: 12:40:27 08/16/01
Go up one level in this thread
On August 16, 2001 at 09:12:33, José Carlos wrote: >On August 16, 2001 at 06:02:19, Peter McKenzie wrote: > >>LambChop takes a while to avoid Ng3, it takes about 50sec to switch to b5 on my >>1ghz machine. The switch to b5 occurs at depth 10. >> >>Interesting position. > > Yes it is. Averno sticks to Ng3. I let it think until ply 13 and the stopped. >Can anyone, please, explain why your programs avoid Ng3? I mean, as a huma, I >can see the danger, but what do strong programs see here to avoid Ng3? > > José C. Here is some analysis of Deep fritz after Ng3 New position 3qr1k1/pp1bppb1/3p2p1/2rN2B1/2nNPPp1/1B4n1/PPP1Q3/2KR3R w - - 0 1 Analysis by Deep Fritz: 2.Bxc4-- -+ (-2.84) Depth: 1/4 00:00:00 2.Bxc4-- Nxe2+ 3.Bxe2 -+ (-3.47) Depth: 1/9 00:00:00 2.Nxe7+! -+ (-3.22) Depth: 1/10 00:00:00 2.Qd3! -+ (-3.12) Depth: 1/10 00:00:00 2.Qd3! Nxh1 -+ (-2.06) Depth: 1/10 00:00:00 2.Qd3 Nxh1 3.Bxc4 -+ (-2.06) Depth: 2/8 00:00:00 2.Qd3 Nxh1 3.Bxc4 -+ (-2.06) Depth: 3/16 00:00:00 2kN 2.Qd3 Nxh1 3.Rxh1 b5 -+ (-2.31) Depth: 4/18 00:00:00 5kN 2.Qd3 Nxh1 3.Rxh1 Na5 4.Kb1 Bxd4 -+ (-2.47) Depth: 5/22 00:00:00 23kN 2.Qd3 Nxh1 3.Rxh1 Na5 4.Kb1 Bxd4 5.Qxd4 Nxb3 -+ (-2.47) Depth: 6/21 00:00:00 54kN 2.Qd3 Nxh1 3.Rxh1 Na5 4.Kb1 g3 5.c3 Nxb3 -+ (-2.44) Depth: 7/29 00:00:00 212kN 2.Qd3 Nxh1 3.Rxh1 Na5 4.Kb1 g3 5.c3 Nxb3 6.Nxb3 -+ (-2.44) Depth: 8/26 00:00:00 487kN 2.Qh2! -+ (-2.41) Depth: 8/26 00:00:01 871kN 2.Qh2! Nxh1 3.Rxh1 Kf8 4.Qh7 Qa5 5.c3 f6 -+ (-1.91) Depth: 8/26 00:00:01 1250kN 2.Qh2! -+ (-1.59) Depth: 9/30 00:00:04 3412kN 2.Qh2! Nxh1 3.Rxh1 f6 4.Bh6 g5 5.Bxg7 Kxg7 6.Qh7+ Kf8 7.fxg5 µ (-0.81) Depth: 9/33 00:00:08 6086kN 2.Qh2! ³ (-0.50) Depth: 10/35 00:00:16 11796kN 2.Qh2! Nxh1 3.Rxh1 f6 4.Bh6 g3 5.Qxg3 Bxh6 6.Rxh6 g5 7.fxg5 = (-0.09) Depth: 10/35 00:00:24 17362kN 2.Qh2 Nxh1 3.Rxh1 f6 4.Bh6 g3 5.Qxg3 Kf7 6.Rg1 g5 = (0.03) Depth: 11/36 00:00:51 35727kN 2.Qh2 Nxh1 3.Rxh1 f6 4.Bh6 g3 5.Qxg3 Kf7 6.Rg1 g5 ² (0.28) Depth: 12/39 00:02:07 88269kN (Blass, Tel-aviv 16.08.2001) without Nxh1 it is clear that there is no idea for Ng3 After 2...Nxh1 3.Rxh1 f6 is forced Here is analysis of Deep Fritz to show what happens without f6(I used the next best and this is the reason that Deep Fritz jumped from depth 9 to depth 1) New position 3qr1k1/pp1bppb1/3p2p1/2rN2B1/2nNPPp1/1B6/PPP4Q/2K4R b - - 0 1 Analysis by Deep Fritz: 3...Bxd4! -+ (-3.69) Depth: 1/10 00:00:00 3...Bxd4! 4.Qh7+ Kf8 -+ (-5.31) Depth: 1/10 00:00:00 3...Bxd4-- +- (#3) Depth: 2/7 00:00:00 3...Bxd4-- +- (#3) Depth: 2/8 00:00:00 3...Rxd5! +- (1.75) Depth: 2/8 00:00:00 3...Rxd5! 4.Qh7+ Kf8 5.exd5 Nxb2 6.Bh6 ³ (-0.59) Depth: 2/8 00:00:00 3...g3! µ (-0.75) Depth: 2/10 00:00:00 3...g3! 4.Qh7+ Kf8 5.Bh6 -+ (-2.22) Depth: 2/11 00:00:00 3...Qa5! -+ (-2.25) Depth: 2/15 00:00:00 3...Kf8! -+ (-2.28) Depth: 2/19 00:00:00 3...Nxb2! -+ (-2.34) Depth: 2/19 00:00:00 1kN 3...Nxb2! 4.Qh7+ Kf8 5.Bh6 -+ (-3.31) Depth: 2/19 00:00:00 1kN 3...Nxb2 4.Qh7+ Kf8 5.Ne3 -+ (-3.41) Depth: 3/19 00:00:00 3kN 3...Nxb2 4.Kxb2 Bxd4+ 5.c3 Bg7 6.Qh7+ Kf8 -+ (-3.34) Depth: 4/18 00:00:00 8kN 3...Nxb2-- -+ (-3.03) Depth: 5/20 00:00:00 13kN 3...Nxb2-- 4.Qh7+ Kf8 5.Bh6 Rxc2+ 6.Kb1 Rc1+ 7.Rxc1 ² (0.56) Depth: 5/24 00:00:00 18kN 3...Kf8! ² (0.53) Depth: 5/24 00:00:00 21kN 3...Kf8! 4.Qh7 Na5 5.Kb1 Nxb3 6.Nxb3 Rc8 -+ (-2.09) Depth: 5/24 00:00:00 43kN 3...Kf8-- -+ (-1.78) Depth: 6/23 00:00:00 70kN 3...Kf8-- -+ (-1.78) Depth: 6/23 00:00:00 76kN 3...Kf8-- -+ (-1.47) Depth: 7/24 00:00:00 130kN 3...Kf8-- 4.Qh7 Qa5 5.Bxc4 Rxc4 6.Bh6 Rxc2+ 7.Nxc2 ± (1.25) Depth: 7/25 00:00:00 225kN 3...Qa5! ± (1.22) Depth: 7/25 00:00:00 268kN 3...f6! ± (1.19) Depth: 7/28 00:00:00 340kN 3...f6! 4.Bh6 g3 5.Qxg3 Bxh6 6.Rxh6 g5 7.fxg5 Kg7 8.Bxc4 = (-0.09) Depth: 7/28 00:00:00 407kN 3...f5! = (-0.13) Depth: 7/29 00:00:00 514kN 3...f5-- = (0.19) Depth: 8/26 00:00:01 691kN 3...f5-- = (0.19) Depth: 8/30 00:00:01 888kN 3...f6! = (0.00) Depth: 8/30 00:00:01 973kN 3...f6! 4.Bh6 g3 5.Qxg3 Kf7 6.Rg1 g5 7.fxg5 fxg5 8.Bxg7 Kxg7 9.Bxc4 = (0.03) Depth: 8/30 00:00:01 1157kN 3...f6 4.Bh6 g3 5.Qxg3 Kf7 6.Rg1 g5 7.fxg5 Bxh6 8.gxh6 ² (0.28) Depth: 9/33 00:00:04 2992kN 3...Bxd4-- ² (0.41) Depth: 1/2 00:00:07 3...Bxd4-- ² (0.41) Depth: 1/5 00:00:07 3...Rxd5! ² (0.37) Depth: 1/5 00:00:07 3...Rxd5! 4.Qh7+ Kf8 ³ (-0.59) Depth: 1/7 00:00:07 3...Rxd5-- ² (0.28) Depth: 2/3 00:00:07 3...Rxd5-- ² (0.28) Depth: 2/5 00:00:07 3...Rxd5! = (-0.03) Depth: 3/11 00:00:07 3...Rxd5! 4.Qh7+ = (-0.09) Depth: 3/11 00:00:07 3...Rxd5-- ² (0.28) Depth: 4/4 00:00:07 3...Rxd5-- 4.Qh7+ Kf8 5.Bh6 e6 6.Bxg7+ Ke7 +- (1.59) Depth: 4/11 00:00:07 3...Nxb2! ± (1.06) Depth: 4/11 00:00:07 3...Nxb2! 4.Qh7+ Kf8 5.Bh6 Nd3+ ² (0.28) Depth: 4/11 00:00:07 1kN 3...Nxb2-- ² (0.59) Depth: 5/17 00:00:07 1kN 3...Nxb2-- ² (0.59) Depth: 5/17 00:00:07 2kN 3...f5! ² (0.53) Depth: 5/20 00:00:07 9kN 3...f5! 4.Qh7+ Kf7 5.exf5 Qa5 ² (0.28) Depth: 5/20 00:00:07 9kN 3...f5! = (-0.03) Depth: 6/20 00:00:07 18kN 3...f5! 4.Qh7+ Kf7 5.exf5 = (-0.06) Depth: 6/20 00:00:07 20kN 3...f5-- ² (0.28) Depth: 7/15 00:00:07 28kN 3...f5-- ² (0.28) Depth: 7/25 00:00:07 49kN 3...f5-- ² (0.59) Depth: 8/25 00:00:07 110kN 3...f5-- ² (0.59) Depth: 8/33 00:00:07 140kN 3...f5-- ± (0.91) Depth: 9/31 00:00:08 567kN 3...f5-- 4.Qh7+ Kf7 5.exf5 gxf5 6.Nxf5 Bxf5 7.Qxf5+ Kg8 8.Bxc4 Rxc4 9.Nxe7+ +- (2.12) Depth: 9/35 00:00:12 2830kN 3...f5-- +- (2.44) Depth: 10/33 00:00:17 5543kN 3...f5-- 4.exf5 Bxf5 5.Qh7+ Kf7 6.Nxf5 Ke6 7.Re1+ Kd7 8.Nxg7 Qa5 9.Nc3 +- (4.91) Depth: 10/37 00:00:35 18043kN 3...f5 4.exf5 Bxf5 5.Qh7+ Kf7 6.Nxf5 Ke6 7.Re1+ Kd7 8.Nxg7 Qa5 9.c3 +- (4.94) Depth: 11/37 00:01:06 39493kN (Blass, Tel-aviv 16.08.2001) after 3...f6 white wins material by Qh7+ or f5 and here is the analysis of Deep Fritz(note that Deep fritz does not see this tactics at the root but it is sad enough with Bh6 in order to avoid Ng3) New position 3qr1k1/pp1bp1b1/3p1pp1/2rN2B1/2nNPPp1/1B6/PPP4Q/2K4R w - - 0 1 Analysis by Deep Fritz: 4.Bxc4! -+ (-2.62) Depth: 1/3 00:00:00 4.Bxc4! Rxc4 5.Qh7+ Kf8 -+ (-1.87) Depth: 1/8 00:00:00 4.Qh7+! -+ (-1.78) Depth: 1/8 00:00:00 4.Qh7+ Kf8 5.Bh6 Bxh6 -+ (-1.84) Depth: 2/11 00:00:00 4.Qh7+! -+ (-1.53) Depth: 3/14 00:00:00 1kN 4.Qh7+! Kf7 5.Bh6 Rg8 6.Qh8 -+ (-1.44) Depth: 3/20 00:00:00 2kN 4.Qh7+ Kf7 5.Bh6 Rg8 6.Ne3 b5 -+ (-1.44) Depth: 4/18 00:00:00 4kN 4.Qh7+ Kf7 5.Bh6 Rg8 6.Ne3 b5 µ (-1.37) Depth: 5/25 00:00:00 19kN 4.Qh7+ Kf7 5.Bh6 Rg8 6.Ne3 b5 7.Kb1 µ (-1.28) Depth: 6/26 00:00:00 56kN 4.Bh6! µ (-1.25) Depth: 6/26 00:00:00 110kN 4.Bh6! g3 5.Qxg3 Bxh6 6.Rxh6 g5 7.fxg5 Kg7 = (-0.09) Depth: 6/26 00:00:00 169kN 4.Bh6 g3 5.Qxg3 Kf7 6.Rg1 g5 7.Bxg7 Kxg7 8.fxg5 = (0.03) Depth: 7/28 00:00:00 319kN 4.Bh6 g3 5.Qxg3 Kf7 6.Rg1 g5 7.fxg5 Bxh6 8.gxh6 ² (0.28) Depth: 8/28 00:00:01 702kN 4.Bh6! ² (0.59) Depth: 9/29 00:00:03 1994kN 4.Bh6! g3 5.Qxg3 Kf7 6.Rg1 g5 7.Bxg7 Kxg7 8.fxg5 Kf7 9.gxf6 ± (0.81) Depth: 9/33 00:00:04 3068kN 4.Bh6 g3 5.Qxg3 Kf7 6.Rg1 g5 7.Bxg7 Kxg7 ± (1.00) Depth: 10/32 00:00:11 7046kN 4.Qh7+! ± (1.03) Depth: 10/32 00:00:12 8242kN 4.Qh7+! Kf7 5.f5 Bxf5 6.exf5 gxf5 7.Nxf5 Ke6 8.Bxc4 Rxc4 9.Nxg7+ Kxd5 +- (4.03) Depth: 10/39 00:00:31 20907kN 4.f5! +- (4.06) Depth: 10/39 00:00:53 35001kN 4.f5! Bxf5 5.exf5 gxf5 6.Ne6 Kf7 7.Nxd8+ Rxd8 8.Bxc4 fxg5 +- (5.31) Depth: 10/39 00:01:20 51886kN 4.f5-- +- (5.00) Depth: 11/35 00:01:31 59327kN 4.f5-- +- (5.00) Depth: 11/37 00:02:00 77804kN 4.f5! +- (5.31) Depth: 12/37 00:03:04 122102kN (Blass, Tel-aviv 16.08.2001)
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