Author: Anthony Cozzie
Date: 18:28:28 09/06/04
Go up one level in this thread
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. With one-rep enabled: 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. Ng4-e3 Kd5-e5 7. Nd6-f7 Ke5-e4 8. Nf7-g5 Ke4-e5 9. Ng5-f3 Ke5-e4 10. Nf3xd2 Ke4-e5 11. Nd2-f3 Ke5-e4 12. Nf3-g5 Ke4-e5 13. Ng5-f7 Ke5-e4 14. Nf7-d6 Ke4-e5 15. Ne3-g4 Ke5-d5 16. Ng4-f6 Kd5-e5 17. Nd6-f7 Ke5-f5 18. Nf7-h6 Kf5-e5 19. Nh6-g4 Ke5-f5 20. Ng4-e3 Kf5-e5 21. Nf6-g4 Ke5-e4 22. Ng4-f2 Ke4-e5 23. Nf2xd3 Ke5-e4 24. Nd3-f2 Ke4-e5 25. Nf2-g4 Ke5-e4 26. Ng4-f6 Ke4-e5 27. Ne3-c4 Ke5-f5 28. Nc4-d6 Kf5-e5 29. Nf6-g4 Ke5-d5 30. c2-c4 = MAT30 Depth: 2/81 00:00:00.21 49kN (236 KN/s, 0 splits, 0 aborts) This whole combination is simply white-checks, black has one response, rinse and repeat. It is just a question of whether you tell the engine to follow forcing lines or not. I think most of the time it is not worth it. anthony
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