Author: Heiner Marxen
Date: 08:38:59 05/31/01
Go up one level in this thread
On May 30, 2001 at 20:43:04, Dan Newman wrote: >On May 30, 2001 at 06:47:33, leonid wrote: > >>Hello! >> >>If you like to solve "usual" mate then try this: >> >>[D]q2k2q1/2nqn2b/1n1P1n1b/2rnr2Q/1NQ1QN1Q/3Q3B/2RQR2B/Q2K2Q1 w - - >> >>Take care, if you will go to solve this position on some good professional >>program. There could be some problem. Just before coming here, I printed this >>position for me on one excellent program. Then, just by curiosity, I pushed >>button to make program look into it. Instantly, some kind of error massage came >>as response. Initial number of moves for this position is not even 100 to run >>program wild. >> >>Please, indicate your result. >> >>Thanks, >>Leonid. > >This one is really weird: 22 million nodes on the two ply search :). >I can't quite figure out why the qsearch only blows up so badly on >that iteration and not the following ones... If you use TT (transposition table, hash) within the qsearch, that would explain it: later qsearches mostly are cached, already. Look at your PVs, they mostly contain capture moves. Otherwise I have no idea. Heiner >Shrike Version 1.59a > > 2. 3817 52.26 22163408 dxc7+ Rxc7 Qxa8+ Nxa8 Bxd7 Rxc4 <QS> > 3+ 3835 52.32 22187909 dxc7 <Fail High> > 3. 3845 52.47 22267989 dxc7+ Rxc7 Qxa8+ Nxa8 Qxg8+ Nfxg8 Bxd7 Bxe4 <QS> > 4. 3846 53.26 22576769 dxc7+ Rxc7 Qxg8+ Nfxg8 Qxc7+ Nxc7 Qxd7+ Nxd7 Qexa >8+ Nxa8 > Rxe5 Bxc2+ Kxc2 <QS> > 5. 3845 56.24 23923210 dxc7+ Rxc7 Qxg8+ Bxg8 Qxa8+ Nxa8 Bxd7 Nxe4 <QS> > 5+ 3846 56.94 24282425 Qxg8 <Fail High> > 5+ 3863 57.14 24365444 Qxg8 <Fail High> > 5. 4220 57.79 24654464 Qxg8+ Bxg8 Qaxe5 Rxc4 dxe7+ Kc8 Bxd7+ Nbxd7 <QS> > 6- 4202 58.92 25175097 Qxg8 <Fail Low> > 6. 4215 59.79 25606079 Qxg8+ Bxg8 Qaxe5 Nxe4 dxe7+ Kc8 Bxd7+ Nxd7 Ra2 <Q >S> > 7+ 4233 1:05 28521207 Qxg8 <Fail High> > 7. 4652 1:09 30531132 Qxg8+ Bxg8 dxe7+ Qxe7 Qxa8+ Ncxa8 Qxc5 Qxc5 Qxf6+ > Qe7 > Nc6+ Kc7 Nxe7+ <QS> > 7+ 4653 1:18 36602223 dxc7 <Fail High> > 7+ 4670 1:20 37407433 dxc7 <Fail High> > 7. +mate9 1:22 39668663 dxc7+ Rxc7 Qxc7+ Qxc7 Qxa8+ Nxa8 Qdxd5+ Nfxd5 Qdx >d5+ Rxd5+ > Qexd5+ Qxd5+ Qxd5+ Ke8 Qxe7+ Qxe7 Rc8# <Checkmate >> > >Shrike quits when it gets a mate on a test problem, so I don't know how much >longer to get mate in 8. > >-Dan.
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