Author: Uri Blass
Date: 00:49:22 09/07/04
Go up one level in this thread
On September 06, 2004 at 21:28:28, Anthony Cozzie wrote: >On September 06, 2004 at 20:25:46, stuart taylor wrote: > >>On September 06, 2004 at 20:19:49, Anthony Cozzie wrote: >> >>>On September 06, 2004 at 17:52:41, Stuart Cracraft wrote: >>> >>>>On September 06, 2004 at 15:07:00, Stuart Cracraft wrote: >>>> >>>>>[D] 5n2/B3K3/2p2Np1/4k3/7P/3bN1P1/2Prn1P1/1q6 w - - 0 0 >>>>> >>>>>Anyone can get this besides Ed? >>>>> >>>>>Please post your search times. >>>> >>>>BTW, Ed does it at ply 1 in 2351 positions. >>>> >>>>I would assume his program was heavily tuned on this position. >>> >>>You are making things out to be way more complicated then they are. If you have >>>1-rep (1 ply) and check (1-ply) you will get this position instantly (like Uri). >>> Ed even says that is how he does it. Its not magic ;) >>> >>>anthony >> >>Nothing to do with great pruning? (I'm ignorant as to what you are explaining >>andwould be interested to understand) >>S.Taylor > >Sure. > >Normal Zappa says: >1. Nf6-g4 Ke5-e4 2. Ng4-f2 Ke4-e5 3. Nf2-g4 > = (0.00) Depth: 1/10 00:00:00.00 0kN (62 KN/s, 0 splits, 0 aborts) >1. Ne3-g4 Ke5-f5 2. Ng4-h6 Kf5-e5 3. Nh6-f7 Ke5-f5 4. Nf7-d6 Kf5-e5 5. Nf6-g4 >Ke5-d5 6. c2-c4 Bd3xc4 7. Ng4-e3 Kd5-e5 8. Nd6xc4 Ke5-e4 9. Nc4xd2 Ke4-d3 10. >Nd2xb1 > = (4.89) Depth: 11/22 00:00:00.70 458kN (655 KN/s, 0 splits, 0 aborts) >1. Ne3-g4 Ke5-f5 2. Ng4-h6 Kf5-e5 3. Nh6-f7 Ke5-f5 4. Nf7-d6 Kf5-e5 5. Nf6-g4 >Ke5-d5 6. c2-c4 Bd3xc4 7. Ng4-e3 Kd5-e5 8. Nd6xc4 Ke5-e4 9. Nc4xd2 Ke4-e5 10. >Nd2xb1 Nf8-h7 11. Ke7-f7 g6-g5 12. Kf7-g6 > = (5.22) Depth: 21/34 00:02:28.16 152135kN (1027 KN/s, 0 splits, 0 aborts) > >Null move is of course very effective here, which is why it is able to get depth >21 so quickly: Nf6-g4 draws, Ne3-g4 wins, and everything else loses instantly. null move is effective in pruning moves of white but I do not see how it is effective in pruning black single replies in the mating lines. If you get selective depth of 34 then you probably do not extend many checks in the mating line for some reason. I guess that you cannot get depth 21 so quickly with extending checks only by a single ply and I guess that most programs extend checks by at least single ply in the relevant mating line. Uri
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