Author: Ernst Walet
Date: 12:34:06 01/28/02
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Fritz7 fails low on Qc8+ in 25 seconds and finds an alternative Bg2 in one minute and finally settles for Qe3 in two and a half minute on my pc. Ernst. New game 6k1/4bppp/2p3n1/5Q2/1qPB4/1P1R1BP1/r6P/7K w - - 0 1 Analysis by Fritz 7: 1.Qc8+ Bf8 2.Qe8 c5 3.Bd5 Ra7 4.Bf2 h6 ² (0.59) Depth: 7/19 00:00:00 212kN 1.Qc8+ Bf8 2.Qe8 c5 3.Bd5 Ra7 4.Bf2 Re7 5.Qc8 ² (0.59) Depth: 8/20 00:00:00 279kN 1.Qc8+ Bf8 2.Qe8 c5 3.Bd5 Ra7 4.Rf3 Nh8 5.Bg1 Qd2 ± (0.84) Depth: 9/23 00:00:01 651kN 1.Qc8+ Bf8 2.Qe8 c5 3.Bd5 Ra7 4.Rf3 Nh8 5.Bf2 h6 6.Kg2 ± (0.91) Depth: 10/24 00:00:02 1422kN 1.Qc8+ Nf8 2.Qxc6 Qe1+ 3.Bg1 Ra1 4.Qb6 Qf1 5.Be4 Qe2 6.Bf5 Qf1 7.g4 Bb4 ² (0.66) Depth: 11/27 00:00:06 3485kN 1.Qc8+ Nf8 2.Qxc6 Qe1+ 3.Bg1 Ra1 4.Qb6 Qf1 5.Be4 Qe2 6.Bf5 Qf1 7.g4 Bb4 ² (0.66) Depth: 12/31 00:00:13 8337kN 1.Qc8+-- ² (0.38) Depth: 13/33 00:00:25 15717kN 1.Qc8+ Nf8 2.Rd1 c5 3.Bg1 Qxb3 4.Qg4 Qc3 5.Bd5 Qe5 6.Qf3 Ne6 7.Be3 Qb2 8.Rd2 = (-0.22) Depth: 13/34 00:00:52 32742kN 1.Bg2! = (-0.19) Depth: 13/34 00:01:00 38222kN 1.Bg2! = (-0.03) Depth: 13/34 00:01:12 45806kN 1.Bg2 Qe1+ 2.Bf1 Qb1 3.c5 Nf8 4.b4 g6 5.Qf3 Qxb4 6.Qxc6 Rc2 7.Qf3 Bxc5 = (0.03) Depth: 13/34 00:01:36 60615kN 1.Qe4! = (0.06) Depth: 13/34 00:02:31 96676kN 1.Qe4! = (0.22) Depth: 13/36 00:02:44 105390kN 1.Qe4 c5 2.Bg1 Qb8 3.Rd7 Qe8 4.Rc7 Ra1 5.Qf5 Bf8 6.Kg2 Ra2+ 7.Kh1 Bd6 ² (0.41) Depth: 13/36 00:03:10 121740kN 1.Qe4 Nf8 2.Bc3 Qb7 3.Qg4 Ne6 4.Be4 g6 5.Qd1 Qb6 6.Rd7 Qf2 7.Qg1 Qxg1+ ² (0.41) Depth: 14/36 00:04:58 187673kN (Celeron 1.2GHz, 832MB hash, 3, 4 & 5 piece EGTB's 28.01.2002) On January 28, 2002 at 14:18:14, Gerd Isenberg wrote: >From CCT4-10 IsiChessX - PostModernist 0-1 > >Does your program avoid Qc8 ? > >[D] 6k1/4bppp/2p3n1/5Q2/1qPB4/1P1R1BP1/r6P/7K w - - am Qc8 > >In this position after 34.Qc8+ Nf8, IsiChess failed even more with 35.Qxc6?? > >[D] 2Q2nk1/4bppp/2p5/8/1qPB4/1P1R1BP1/r6P/7K w - - am Qxc6 > >After 34.Qc8? Nf8 IsiChess got a FailLow with Qxc6 and a very bad search >behaviour. The first one at depth 10 from +130 to +95 after 0:10, a second one >at depth 13 after 1:45 resp. 2:06 from +106 ..via +65-- to -164. Few moments >later, i got an exploding search tree looking for 35.Bc3. > >After 11:10 it came back with a score of -0.88 and after 18:18 it found Rd1 with >-0.83. But unfortunally during the game, my maxTime exceeds (aprox. 3*averadge >time), signaled the Search thread to terminate unconditionally after aprox. 8 >Minutes - and IsiChess played Qxc6?? > >Seems that the FailLow behaviour of my Search needs some work, may be too many >extensions, but the wrong. Also i have to think about interrupting the Search in >these FailLow situations. Most often my branching factor seems OK, but sometimes >these terrible exceptions. > >Very impressed of PostModernist 33...Qb4! > >cheers, Gerd
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