Author: Will Singleton
Date: 10:01:34 06/05/04
Go up one level in this thread
On June 05, 2004 at 12:53:53, Uri Blass wrote: >On June 05, 2004 at 12:32:47, Will Singleton wrote: > >>On June 05, 2004 at 10:13:35, Anthony Cozzie wrote: >> >>>On June 04, 2004 at 19:03:53, Anthony Cozzie wrote: >>> >>>>From Yace-Zappa >>>> >>>>[D]3q1rk1/pp1bppbp/3p1npB/8/2rNP1P1/2N2P2/PPPQ4/2KR3R b - - 0 16 >>>> >>>>1... Nf6xe4 2. f3xe4 Bg7xd4 3. Qd2-d3 b7-b5 4. Nc3-d5 Bd4-e5 5. Bh6xf8 Qd8xf8 6. >>>>g4-g5 Qf8-g7 7. c2-c3 Rc4-a4 8. Kc1-b1 Kg8-f8 >>>> = (0.32) Depth: 15/38 00:06:02.03 263847kN >>>> >>>>The game continued Nxe4 Qe3 Rxc3 bxc3 Qh6 Nf6 and now your program should be >>>>able to see g5! and white is able to win the queen. >>>> >>>>Anyone out there that can avoid Nxe4 in reasonable time? >>>> >>>>anthony >>> >>>OK, as has been pointed out by about 25 people, the mistake is not Nxe4, but >>>Bxh6 (a move which somehow I conviently omitted from the my line). >>> >>>[D]3q1rk1/pp1bppbp/3p2pB/8/3Nn1P1/2P1QP2/P1P5/2KR3R b - - 0 18 >>> >>>Even this one is pretty hard for Zappa, it needs 70 seconds to realize Bxh6 is >>>losing and 6 minutes switch to Nf6. >>> >>>1... Bg7xh6 2. Rh1xh6 Ne4-f6 3. Rd1-h1 e7-e5 4. Nd4-f5 Bd7xf5 5. g4xf5 Qd8-a5 6. >>>Qe3-g5 Qa5-a3 7. Kc1-d1 Kg8-g7 8. f5xg6 f7xg6 >>> = (0.50) Depth: 14/31 00:00:46.41 37517kN >>>1 ...Bg7xh6-- >>> - (0.25) Depth: 15/30 00:01:08.74 55010kN >>>1... Bg7xh6 2. Qe3xh6 Ne4-f6 3. g4-g5 Nf6-h5 4. Rh1xh5 g6xh5 5. Rd1-h1 Qd8-a5 6. >>>Rh1xh5 Bd7-f5 7. Nd4xf5 Qa5xf5 8. g5-g6 Qf5xg6 9. Rh5-g5 Rf8-c8 10. Rg5xg6 h7xg6 >>> = (-2.83) Depth: 15/34 00:03:02.47 147329kN >>>1... Ne4-f6 2. Bh6xg7 Kg8xg7 3. Nd4-f5 Bd7xf5 4. g4xf5 Qd8-a5 5. Qe3xe7 Qa5xa2 >>>6. Qe7xb7 Qa2-a3 7. Qb7-b2 Qa3-c5 8. f5xg6 f7xg6 9. Rh1-e1 Rf8-c8 10. Re1-e7 >>>Kg7-h6 >>> = (0.18) Depth: 15/36 00:05:34.28 269390kN >>> >>>anthony >> >> >>The time it takes to find Nf6 after seeing the problem with Bxh6 is rather long >>for some programs. For example, Crafty (3 min), Ruffian (1:30) and Zappa >>(2:30). This is because the problem occurs at a high search depth. >> >>Amateur does better in switching to the right move, taking only 10 sec. It does >>this by "cheating," which is to say, reducing the search depth when a large >>score drop occurs. I don't really see a downside to this. >> >>Crafty >>14 191 11683 124623699 1. ... Bxh6 2. Qxh6 Nf6 >>14 16 30945 341466474 1. ... Nf6 2. Bxg7 Kxg7 >> >>Ruffian >>14 -161 10004 121228508 Bxh6 Qxh6 Nf6 >>14 -5 18402 223090636 Nf6 Bxg7 Kxg7 >> >>Amateur >>16 -243 12517 49364251 Bxh6 Qxh6 Nf6 >>13 -243 12517 49364252 Bxh6 >>13 87 13581 53146356 Nf6 Bxg7 Kxg7 > > >all these programs do better than movei that cannot get so deep. >Movei find at depth 14 that Bxh6 is bad but it takes it clearly more time and >even more nodes(movei is relatively slow searcher). > >Note that movei has no threat mate extensions and I suspect that threat mate >extensions can help to find that Bxh6 is bad at least one ply earlier. > >Uri OK, but do you have a comment regarding the point of my post?
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