Author: Tim Foden
Date: 07:19:25 08/15/03
Go up one level in this thread
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. And in my development version I've changed it to fail low immediately if the first move fails low. Cheers, Tim.
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.