Author: Uri Blass
Date: 07:33:11 08/15/03
Go up one level in this thread
On August 15, 2003 at 10:19:25, Tim Foden 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 > >The current GLC can also do this sometimes. If the first move score is lower >than alpha, it is not reported, and search continues. If a move is eventually >found that is greater than alpha, then it is reported. Thus you can change PV >at a given depth without printing a PV for the previous best move. It doesn't >happen often, but it happens. Maybe this is what is happening with Zappa's >output here. I always investigates fails low first but maybe it is better if I do not do it. > >And in my development version I've changed it to fail low immediately if the >first move fails low. > >Cheers, Tim. Do you mean that in the output you write that it fails low like the following output 1. Rg1 -- 1.Rf3 +0.14 or 1.Rg1 <0.13 1.Rf3 +0.14 Do you go back to the first move in the same iteration in case that you find nothing better than alpha for the other moves. Uri
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