Author: Anthony Cozzie
Date: 07:52:04 08/15/03
Go up one level in this thread
On August 15, 2003 at 10:38:47, Uri Blass wrote: >On August 15, 2003 at 10:27:44, Anthony Cozzie wrote: > >>On August 15, 2003 at 10:13:05, Uri Blass wrote: >> >>>On August 15, 2003 at 10:03:06, Anthony Cozzie wrote: >>> >>>>On August 15, 2003 at 09:56:35, Uri Blass wrote: >>>> >>>>>On August 15, 2003 at 08:36:00, Anthony Cozzie wrote: >>>>> >>>>>>[D]r4r1k/1b3p1p/pq3N1p/n3p2N/Pp6/3Bn3/1PP1Q1PP/R4R1K w - - 0 26 >>>>>> >>>>>>1. Rg1 Rfc8 2. Bxh7 Qd4 3. Rab1 >>>>>> = (-0.89) Depth: 5/12 00:00:00.25 40kN >>>>>>1. Rg1 Rfd8 2. Rae1 Bxg2 3. Rxg2 Nxg2 4. Qxg2 Qg1 5. Rxg1 >>>>>> = (-1.00) Depth: 6/16 00:00:00.70 153kN >>>>>>1. Rg1 Rfd8 2. Rae1 Bxg2 3. Rxg2 Nxg2 4. Qxg2 Qb7 5. Rxe5 Qxg2 >>>>>> + (-0.70) Depth: 7/19 00:00:01.36 377kN >>>>>>1. Rg1 e4 2. Bxe4 Bxe4 3. Nxe4 f5 4. Nef6 Rfd8 >>>>>> = (-0.09) Depth: 7/19 00:00:02.15 685kN >>>>>>1. Rg1 e4 2. Bxe4 Bxe4 3. Nxe4 f5 4. Qxe3 Qxe3 >>>>>> = (0.00) Depth: 8/23 00:00:03.48 1192kN >>>>>>1. Rf2 e4 2. Bxe4 Bxe4 3. Nxe4 f5 4. Nef6 Rfc8 5. Qd3 Rd8 >>>>>> = (-0.04) Depth: 9/30 00:00:20.53 7692kN >>>>>>1. Rf3 Bxf3 2. Qxf3 Qd4 3. Re1 Qh4 4. g3 Nxc2 >>>>>> = (0.25) Depth: 10/33 00:00:42.98 16634kN >>>>>>1. Rg1 Qd4 2. Rae1 Nec4 3. Bxc4 Nxc4 4. Rd1 Qc5 5. Nd7 Nb6 6. Nxf8 Rxf8 >>>>>> = (0.43) Depth: 11/39 00:01:25.00 33717kN >>>>>>1. Rf3 Bxf3 2. Qxf3 Qd4 3. Re1 Qh4 4. g3 Nac4 5. gxh4 Ng4 6. Bxc4 Nf2 >>>>>> + (0.73) Depth: 12/48 00:05:37.18 133815kN >>>>>>1. Rf3 Nxg2 2. Qxg2 Rg8 3. Qe2 Rg5 4. Be4 Rc8 5. h4 Rg6 6. Nd7 Qd4 7. Bxb7 Qxh4 >>>>>>8. Qh2 Qxh2 9. Kxh2 >>>>>> = (1.24) Depth: 12/48 00:12:16.28 298098kN >>>>>> >>>>>>Very tough for Zappa. 5 minutes. It changes its mind a lot here as well, which >>>>>>never helps - Rg1, then Rf2, then Rf3, then Rg1, then Rf3 again. >>>>>> >>>>>>anthony >>>>> >>>>>I wonder how does zappa knows not to consider first Rg1 at depth 12. >>>>>zappa has a score for Rg1 at depth 11 and the first output at depth 12 is a >>>>>score for Rf3. >>>>> >>>>>Uri >>>> >>>>I'm not sure what is strange (other than the slow times): Zappa likes Rg1 at >>>>depth 11, fails high on Rf3 at depth 12, and ends up with Rf3 as the best move >>>>at depth 12. >>>> >>>>anthony >>> >>>The fact that I see no score for Rg1 at depth 12. >>>Does zappa have a score for Rg1 at depth 12 before finding Rf3? >>> >>>If it has a score then I do not see it in the output and if it decides to search >>>Rf3 before Rg1 at depth 12 then how does it know to do it. >>> >>>Uri >> >>Zappa only prints the PV at the end of the search - no intermediate pvs. >> >>anthony > >In this case I have 2 questions: >1)how can you know the time that it needs to find a move? >2)why does it print 2 pvs for Rf3 at depth 12 and 2 pvs for Rg1 at depth 7? > >Uri Zappa uses an aspiration window. The first character shows how the search went: - -> window failed low, + -> window failed high, = -> good. So Zappa tried PVS(p, 0.5) and failed high. Then it tried PVS(p, 1.25) and was successful. In other words, Zappa doesn't treat the root position differently. I'm not sure I'm doing a very good job of explaining this.
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