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Subject: Re: Testposition from CCT4

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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