Author: Uri Blass
Date: 08:03:33 08/15/03
Go up one level in this thread
On August 15, 2003 at 10:52:04, Anthony Cozzie wrote: >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. If I understand correctly zappa finished iteration about the moves and got during that iteration a score for Rg1 that was not published and a fail high for Rf3 that finished the iteration. After doing it it did the iteration again at the same depth and got an exact score for Rf3. 5:37.18 is the time to find Rf3 because of the fail high but 1:25 is not the time to find score for Rg1 but the time to finish iteration 11 that is not the same. Uri
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