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Subject: Johan de Koning, clearing hash between moves

Author: K. Burcham

Date: 07:16:52 01/30/06



Is this an example why Johan de Koning clears hash between moves?
Qb4 is a blunder. Rybka played Qb4 in the game, instead of the safer Qb5. If I
play through the moves at depth 11 with hash info, Rybka will blunder (first
example).

If I clear the hash and play from this position with empty hash, Rybka does not
show blunder Qb4 in eval (second example).

Nichtda,F - Qwertyui,R, 3m + 0s, rated blitz 2006
2Q5/1p2kb2/1q3p1P/2p2P2/3pP3/4b2R/8/3B3K b - - 0 1

Rybka 1.0 Beta 32-bit:

46...Qb4 47.Qc7+ Ke8 48.Qc8+ Ke7 49.Qc7+ Ke8 50.Qc8+ Ke7 51.Qc7+
  =  (0.00)   Depth: 7   00:00:00
46...Qb4 47.Qc7+ Ke8 48.Qc8+ Ke7 49.Qc7+ Ke8 50.Qc8+ Ke7 51.Qc7+
  =  (0.00)   Depth: 8   00:00:00
46...Qb4 47.Qc7+ Ke8 48.Qc8+ Ke7 49.Qc7+ Ke8 50.Qc8+ Ke7 51.Qc7+
  =  (0.00)   Depth: 9   00:00:00
46...Qb4 47.Qc7+ Ke8 48.Qc8+ Ke7 49.Qc7+ Ke8 50.Qc8+ Ke7 51.Qc7+
  =  (0.00)   Depth: 10   00:00:00
46...Qb4 47.Qc7+ Ke8 48.Qc8+ Ke7 49.Qc7+ Ke8 50.Qc8+ Ke7 51.Qc7+
  =  (0.00)   Depth: 11   00:00:01
46...Qb4 47.Qc7+ Ke8 48.Qg3 Qb1 49.Qg4 Bxh6 50.Rxh6 Ke7 51.Rh8
  +-  (3.17)   Depth: 12   00:00:03  286kN
46...Qb5 47.Rf3 Bxh6 48.e5 Qc6 49.exf6+ Kd6 50.Qb8+ Qc7 51.Qxc7+
  ²  (0.27)   Depth: 12   00:00:25  1637kN
46...Qb5 47.Rf3 Bxh6 48.e5 Bd5 49.Qc7+ Qd7 50.exf6+ Ke8 51.f7+
  ²  (0.53)   Depth: 13   00:00:48  3012kN
46...Qb5 47.Rf3 Bxh6 48.Qc7+ Qd7 49.Qxc5+ Qd6 50.Qb5 b6 51.Rh3
  ²  (0.63)   Depth: 14   00:01:17  4956kN


46...Qb5 47.Qc7+ Ke8 48.Qc8+ Ke7 49.Qc7+ Ke8 50.Qc8+ Ke7 51.Qc7+
  =  (0.00)   Depth: 7   00:00:00  9kN
46...Qb5 47.Qc7+ Ke8 48.Qc8+ Ke7 49.Qc7+ Ke8 50.Qc8+ Ke7 51.Qc7+
  =  (0.00)   Depth: 8   00:00:00  19kN
46...Qb5 47.Qc7+ Ke8 48.Qc8+ Ke7 49.Qc7+ Ke8 50.Qc8+ Ke7 51.Qc7+
  =  (0.00)   Depth: 9   00:00:00  43kN
46...Qb5 47.Qc7+ Ke8 48.Qc8+ Ke7 49.Qc7+ Ke8 50.Qc8+ Ke7 51.Qc7+
  =  (0.00)   Depth: 10   00:00:01  96kN
46...Qb5 47.Qc7+ Ke8 48.Qc8+ Ke7 49.Qc7+ Ke8 50.Qc8+ Ke7 51.Qc7+
  =  (0.00)   Depth: 11   00:00:03  252kN
46...Qb5 47.Rf3 Bxh6 48.e5 fxe5 49.Qc7+ Kf8 50.Qd8+ Qe8 51.Qd6+
  =  (0.15)   Depth: 12   00:00:14  937kN
46...Qb5 47.Rf3 Bxh6 48.e5 Bd5 49.Qc7+ Qd7 50.exf6+ Ke8 51.f7+
  ²  (0.53)   Depth: 13   00:00:43  2605kN
46...Qb5 47.Rf3 Bxh6 48.Qc7+ Qd7 49.Qxc5+ Qd6 50.Qb5 b6 51.Rh3
  ±  (0.75)   Depth: 14   00:01:17  4809kN
46...Qb5 47.Qc7+ Ke8 48.Rf3 Qb1 49.Qc8+ Ke7 50.Qxc5+ Kd7 51.Qc2
  ±  (0.88)   Depth: 15   00:02:59  11338kN

Re: Johan de Koning, clearing hash between moves Kurt Utzinger 08:08:42 01/30/06
Re: Johan de Koning, clearing hash between moves Albert Silver 07:51:03 01/30/06
Re: Johan de Koning, clearing hash between moves chandler yergin 07:25:04 01/30/06
position with diagram K. Burcham 07:18:03 01/30/06
- Re: position with diagram chandler yergin 07:29:39 01/30/06
  - Re: position with diagram Robert Hyatt 08:24:26 01/30/06
    - Re: position with diagram chandler yergin 08:34:22 01/30/06
      - Re: position with diagram Robert Hyatt 10:08:16 01/30/06

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