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Subject: Fix for PV instability?

Author: Anthony Cozzie

Date: 22:33:00 12/01/02


1. e4 b6 2. exd5 exd5 3. Rb1
 = (0.25)       Depth: 5        00:00:00.04     21kN
1. e4 b6 2. Qe2 dxe4 3. Bxe4 Nxe4
 = (0.25)       Depth: 6        00:00:00.09     42kN
1. e4 b6 2. Qe2 dxe4 3. Bxe4 Nxe4 4. Nxe4
 = (0.25)       Depth: 7        00:00:00.23     112kN
1. e4 b6 2. exd5 exd5 3. Qe1 Re8 4. Ne5 Nxe5
 = (0.24)       Depth: 8        00:00:01.21     541kN
1. Ne5 Nxe5 2. dxe5 Nd7 3. Qg4 Kh8 4. Rfd1 b6 5. Bg3
 = (0.21)       Depth: 9        00:00:09.75     4667kN
1. e4 b6 2. Qe2 Re8 3. Rfe1 Bb7 4. Nd2 a5 5. Bb5 Kh8
 = (0.15)       Depth: 10       00:00:24.49     11115kN
1. e4 b6 2. Qe2 Re8 3. Rfe1 Bb7 4. Nd2 a5 5. Bb5 Bb4 6. f3
 = (0.15)       Depth: 11       00:00:58.47     27207kN

Time: 60093ms, Nodes: 27844k, Quiescence Nodes: 13650k [49%]
Table Hits: 4073k [15%], Table Pings: 5799k [21%], NPS: 463k, Null Cuts: 295k

Recently I have noticed that Zappa sometimes changes its mind for 1 move in a
most annoying way.  Its pretty clear that the score is not changing much, but it
still has to work out an entirely new PV.  I expect that as I expand on the
rather rudimentary evaluation this problem will only get worse.  So A) does
anyone else view this as a problem, and B) what did you guys do to mitigate it?

anthony



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