Author: Daniel Shawul
Date: 01:29:31 07/04/04
Go up one level in this thread
On July 04, 2004 at 04:12:06, Gian-Carlo Pascutto wrote: >On July 04, 2004 at 04:00:56, Daniel Shawul wrote: > >>8/3p4/3P2p1/7p/3B3k/3q1P2/4N1P1/7K w - - >>I am currently using this zugzwang postion [posted here some time ago] >> to experiment with double null move and verified null move pruning. >> >>Here is the result with verified null move on >> >> DANCHESS 1.06e WB2 16 MB: >> 5 00:00 -1.15 1. Bf6+! >> 5 00:00 -1.15 1. Bf6+ g5 2. Nc3 Kg3 3. Be5+ Kf2 4. Ne4+ Ke3 5. Nxg5 >> 6 00:00 -1.33 1. Bf6+ g5 2. Nc3 Kg3 3. Ne4+ Kf4 4. Bxg5+ Kf5 5. Kh2 Qc4 >> 7 00:00 -1.11 1. Bf6+! >> 7 00:00 -1.01 1. Bf6+ g5 2. Nc3 Kg3 3. Ne4+ Kf4 4. Bxg5+ Kf5 >> 8 00:00 -1.01 1. Bf6+ g5 2. Nc3 Kg3 3. Ne4+ Kf4 4. Bxg5+ Kf5 5. Kh2 Qd1 6. >>Kg3 Qe1+ >> 9 00:00 -0.98 1. Bf6+ g5 2. Nc3 Kg3 3. Ne4+ Kf4 4. Bxg5+ Kf5 5. Kh2 Qd5 >>10 00:01 -1.07 1. Bf6+ g5 2. Nc3 Kg3 3. Ne4+ Kf4 4. Bxg5+ Kf5 5. Kh2 Qd1 6. >>Be7 Qd5 7. Kg3 Qe5+ >>11 00:01 0.00 1. Bf6+! >>11 00:01 2.02 1. Bf6+! >>11 00:04 4.33 1. Bf6+ g5 2. Kh2 Qxf3 3. Bxg5+ Kxg5 4. gxf3 Kf5 5. Kh3 Ke5 >>6. Kh4 Kxd6 7. Kxh5 Ke5 >>12 00:05 4.73 1. Bf6+ g5 2. Kh2 Qxf3 3. Bxg5+ Kxg5 4. gxf3 Kf5 5. Ng3+ Ke5 >>6. Ne4 Kf4 7. Kh3 >>13 00:06 4.76 1. Bf6+ g5 2. Kh2 Qxf3 3. Bxg5+ Kxg5 4. gxf3 Kf5 5. Ng3+ Ke5 >>6. Ne4 Kf4 7. Kg2 >>14 00:09 4.92 1. Bf6+ g5 2. Kh2 Qxf3 3. Bxg5+ Kxg5 4. gxf3 Kf5 5. Ng3+ Ke5 >>6. Ne4 Kf4 7. Kh3 Ke5 8. Kh4 Kf4 9. Kxh5 Kxf3 10. Nf6 >>15 00:11 5.42 1. Bf6+! >>15 00:12 5.42 1. Bf6+ >> >> and with double null move >>DANCHESS 1.06e WB2 16 MB: >> 5 00:00 -1.24 1. Bf6+! >> 5 00:00 -1.15 1. Bf6+ g5 2. Nc3 Kg3 3. Be5+ Kf2 4. Ne4+ Ke3 5. Nxg5 >> 6 00:00 -1.33 1. Bf6+ g5 2. Nc3 Kg3 3. Ne4+ Kf4 4. Bxg5+ Kf5 5. Kh2 Qc4 >> 7 00:00 -1.11 1. Bf6+! >> 7 00:00 -1.01 1. Bf6+ g5 2. Nc3 Kg3 3. Ne4+ Kf4 4. Bxg5+ Kf5 5. Kh2 Qb1 >> 8 00:00 -1.01 1. Bf6+ g5 2. Nc3 Kg3 3. Ne4+ Kf4 4. Bxg5+ Kf5 5. Kh2 Qb1 6. >>Kg3 >> 9 00:01 -0.96 1. Bf6+ g5 2. Nc3 Kg3 3. Ne4+ Kf4 4. Bxg5+ Kf5 5. Kh2 Qd5 6. >>Kg3 Qe5+ 7. Kf2 Qe6 >>10 00:02 -1.07 1. Bf6+ g5 2. Nc3 Kg3 3. Ne4+ Kf4 4. Bxg5+ Kf5 5. Kh2 Qb1 6. >>Be7 Qb5 7. Kg3 Qe5+ >>11 00:04 -1.01 1. Bf6+ g5 2. Nc3 Kg3 3. Ne4+ Kf4 4. Bxg5+ Kf5 5. Kh2 Qd4 6. >>Kg3 Qg1 7. Nf2 >>12 00:10 -0.49 1. Bf6+! >>12 00:10 1.67 1. Bf6+! >>12 00:13 6.05 1. Bf6+ g5 2. Bc3 Qxe2 3. Kh2 >>13 00:15 5.55 1. Bf6+? >>13 00:16 3.55 1. Bf6+? >>13 00:35 -0.38 1. Bf6+ g5 2. Kh2 Qxe2 3. Bc3 Qd2 4. Bxd2 g4 5. g3# >>14 03:17 -0.38 1. Bf6+ g5 2. Kh2 Qxe2 3. Bc3 Qd2 4. Bxd2 g4 5. g3# >> >>sees the correct score at depth 12 and then falls back?? >> >>Here is how i implemented double null move >> >> >>DoNull is 2 by default >> >>if( !hist_at_hply->check && >> Board.piece_c[Player] && >> DoNull ) >>{ >> make null >> score = -search(-beta,-beta+1,depth-R*UNITDEPTH-UNITDEPTH,DoNull-1); >> undo null >>} >> >>any help appreciated >>daniel > >Make sure all your search calls outside this fuction are with DoNull==2. i defined the search with DoNull = 2 int search(int alpha,int beta,int depth,short DoNull=2); I only pass DoNull parameter inside the nullmove so i don't think that's the problem. I then tried turning off IID , hashtable. With the hashtable turned off it seems to work DANCHESS 1.06e WB2 16 MB: 5 00:00 -1.36 1. Bf6+! 5 00:00 -1.15 1. Bf6+ g5 2. Nc3 Kg3 3. Be5+ 6 00:00 -1.33 1. Bf6+ g5 2. Nc3 Kg3 3. Ne4+ Kf4 4. Bxg5+ Kf5 5. Kh2 Qc4 7 00:00 -1.11 1. Bf6+! 7 00:01 -1.01 1. Bf6+ g5 2. Nc3 Kg3 3. Ne4+ Kf4 4. Bxg5+ Kf5 5. Kh2 Qb1 8 00:01 -1.01 1. Bf6+ g5 2. Nc3 Kg3 3. Ne4+ Kf4 4. Bxg5+ Kf5 5. Kh2 Qd1 6. Kg3 Qe1+ 7. Kh3 9 00:02 -0.42 1. Bf6+! 9 00:05 1.70 1. Bf6+! 9 00:06 4.06 1. Bf6+ g5 2. Kh2 Qxf3 3. Bxg5+ Kxg5 4. gxf3 Kh4 5. f4 Kg4 6. Ng3 btw, i store null cutoffs in hashtable. daniel > >To me it looks like a bug outside nullmove that is triggered by this. > >-- >GCP
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