Author: A. Cozzie
Date: 19:00:27 08/11/05
Go up one level in this thread
On August 11, 2005 at 15:15:02, A. Cozzie wrote: >On August 11, 2005 at 15:08:39, John Merlino wrote: > >>On August 11, 2005 at 11:52:20, Will Singleton wrote: >> >>>[d]2rq3k/Qp1r2pp/1P6/2p1pP2/1b6/3PBB1b/4PP1P/R1R3K1 b - - am Bxf5 >> >>CM9_R1 on an AMD 2500 does not see anything better than Bxf5 in under five >>minutes: >> >>Time Depth Score Positions Moves >>0:00 1/3 0.65 1779 1...Qe7 2.Be4 Rf8 >>0:00 1/4 0.14 4229 1...Qe7 2.Be4 Rf8 3.Qa2 Bxf5 4.Bxf5 >> Rxf5 >>0:00 1/4 -0.15 8696 1...Bxf5 2.Bg2 Qe7 3.Rc4 Be6 >>0:00 1/5 -0.15 15259 1...Bxf5 2.Bg2 Qe7 3.Rc4 Be6 >>0:00 1/6 -0.08 40337 1...Bxf5 2.Bxb7 Rb8 3.Bg2 Rxa7 >> 4.bxa7 Ra8 5.Bxa8 Qxa8 6.Bxc5 >>0:00 1/7 -0.08 172253 1...Bxf5 2.Bxb7 Rb8 3.Bg2 Rxa7 >> 4.bxa7 Ra8 5.Bxa8 Qxa8 6.Bxc5 >>0:01 1/8 -0.06 288147 1...Bxf5 2.Bxb7 Rb8 3.Bc6 Rxa7 >> 4.bxa7 Ra8 5.f3 Be6 6.Bxa8 Qxa8 >> 7.Bxc5 >>0:03 1/9 0.03 790884 1...Bxf5 2.Bxb7 Rb8 3.Bc6 Rxa7 >> 4.bxa7 Ra8 5.Bxa8 Qxa8 6.Bxc5 Bd2 >> 7.Rc4 >>0:07 1/10 0.00 1792747 1...Bxf5 2.Bxb7 Rb8 3.Bg2 Rxa7 >> 4.bxa7 Ra8 5.Bxc5 Bd2 6.Rc2 Bf4 >> 7.Bxa8 Qxa8 >>0:16 1/11 0.20 4334263 1...Bxf5 2.Bxb7 Rb8 3.Bg2 Rxa7 >> 4.bxa7 Ra8 5.Bxa8 Qxa8 6.Bxc5 Bd2 >> 7.Rc2 Bf4 8.e4 >>0:42 1/12 0.20 11644968 1...Bxf5 2.Bxb7 Rb8 3.Bg2 Rxa7 >> 4.bxa7 Ra8 5.Bxa8 Qxa8 6.Bxc5 Bd2 >> 7.Rc2 Bf4 8.e4 >>2:08 1/13 0.54 35947673 1...Bxf5 2.Bxb7 Rb8 3.Bg2 Rxb6 >> 4.Qa8 Rb8 5.Qxb8 Qxb8 6.Ra8 Qxa8 >> 7.Bxa8 Ba3 8.Rc2 Rc7 9.Bd5 Bb4 >> >>jm > >This is a tough position. Zappa (4 CPUs) needs 17 ply / 3 minutes (or 14 ply / >1 minute with SE) to see -2.5 for Black after Bxf5. > >However the alternative (Qe7) is also lost, so I guess the correct goal here >should be 'get +1 for white'. > >anthony Since Bob posted some logs I guess I'll post mine as well :) 1P: 1... Bh3xf5 2. Bf3xb7 Rc8-b8 3. Bb7-c6 Rd7xa7 4. b6xa7 Rb8-a8 5. Bc6xa8 Qd8xa8 6. Be3xc5 Bf5-h3 7. f2-f3 Bb4-d2 8. Rc1-b1 = (-0.26) Depth: 14/32 00:00:34.45 29108kN (845 KN/s, 0 splits, 0 aborts) 1... Bh3xf5 2. Bf3xb7 Rc8-b8 3. Bb7-c6 Rd7xa7 4. b6xa7 Rb8-a8 5. Bc6xa8 Qd8xa8 6. Be3xc5 Bf5-h3 7. f2-f3 Bb4-d2 8. Rc1-b1 = (-0.26) Depth: 14/32 00:00:48.91 41047kN (839 KN/s, 0 splits, 0 aborts) 1... Bh3xf5 2. Bf3xb7 Rc8-b8 3. Bb7-c6 Rd7xa7 4. b6xa7 Rb8-a8 5. Be3xc5 Bf5-h3 6. Rc1-b1 Qd8-g5 7. Kg1-h1 e5-e4 8. Bc6xe4 Bb4-c3 9. Be4xa8 Qg5xc5 10. Rb1-b8 Bh3-c8 = (-0.78) Depth: 15/33 00:01:07.96 57612kN (848 KN/s, 0 splits, 0 aborts) 1... Bh3xf5 2. Bf3xb7 Rc8-b8 3. Bb7-c6 Rd7xa7 4. b6xa7 Rb8-a8 5. Be3xc5 Bf5-h3 6. Rc1-b1 Qd8-g5 7. Kg1-h1 e5-e4 8. Bc6xe4 Bb4-c3 9. Be4xa8 Qg5xc5 = (-0.78) Depth: 15/34 00:04:03.25 197999kN (814 KN/s, 0 splits, 0 aborts) 4P: 1... Bh3xf5 2. Bf3xb7 Rc8-b8 3. Bb7-c6 Rd7xa7 4. b6xa7 Rb8-a8 5. Bc6xa8 Qd8xa8 6. Be3xc5 Bf5-h3 7. f2-f3 Bb4-d2 8. Rc1-b1 = (-0.26) Depth: 14/32 00:00:15.62 47502kN (3040 KN/s, 3056 splits, 186 aborts) 1... Bh3xf5 2. Bf3xb7 Rc8-b8 3. Bb7-c6 Rd7xa7 4. b6xa7 Rb8-a8 5. Be3xc5 Bf5-h3 6. Rc1-b1 Qd8-g5 7. Kg1-h1 e5-e4 8. Bc6xe4 Bb4-c3 9. Be4xa8 Qg5xc5 10. Rb1-b8 Bh3-c8 = (-0.78) Depth: 15/36 00:00:21.64 67188kN (3104 KN/s, 3445 splits, 236 aborts) 1... Bh3xf5 2. Bf3xb7 Rc8-b8 3. Bb7-c6 Rd7xa7 4. b6xa7 Rb8-a8 5. Be3xc5 Bf5-h3 6. Rc1-b1 Qd8-g5 7. Kg1-h1 e5-e4 8. Bc6xe4 Bb4-c3 9. Be4xa8 = (-0.78) Depth: 15/36 00:01:24.71 261796kN (3090 KN/s, 6479 splits, 529 aborts) 1... Bh3xf5 2. Bf3xb7 Rc8-b8 3. Bb7-c6 Rd7xa7 4. b6xa7 Rb8-a8 5. Be3xc5 Bf5-h3 6. Bc6xa8 Qd8xa8 7. f2-f3 Bb4-d2 8. Rc1-b1 Bh3-c8 9. Ra1-a6 = (-0.62) Depth: 16/36 00:01:33.42 290983kN (3115 KN/s, 6909 splits, 554 aborts) 1... Bh3xf5 2. Bf3xb7 Rc8-b8 3. Bb7-c6 Rd7xa7 4. b6xa7 Rb8-a8 5. Be3xc5 Bf5-h3 6. Bc6xa8 Qd8xa8 7. f2-f3 Bb4-d2 8. Rc1-b1 Bh3-c8 9. Ra1-a6 = (-0.62) Depth: 16/36 00:02:13.38 410600kN (3078 KN/s, 8294 splits, 639 aborts) 1... Bh3xf5 2. Bf3xb7 Rc8-b8 3. Bb7-c6 Rd7xa7 4. b6xa7 Rb8-a8 5. Bc6xa8 Qd8xa8 6. Be3xc5 Bb4xc5 7. Rc1xc5 Bf5-h3 8. f2-f3 Kh8-g8 9. Ra1-a5 Kg8-f7 = (-2.18) Depth: 17/37 00:02:49.30 525774kN (3105 KN/s, 8852 splits, 694 aborts) 1 ...Qd8-e7!! = (-2.17) Depth: 17/37 00:03:14.29 607841kN (3128 KN/s, 9206 splits, 748 aborts) 1... Qd8-e7 2. Qa7-a4 Rc8-d8 3. Be3xc5 Bb4xc5 4. Rc1xc5 Rd7-d4 5. Rc5-c4 Bh3xf5 6. Rc4xd4 e5xd4 7. Qa4-a5 Bf5-h3 8. Ra1-c1 Qe7-h4 9. Rc1-c7 Qh4-f4 = (-1.01) Depth: 17/38 00:07:37.85 1432121kN (3128 KN/s, 10235 splits, 872 aborts) 1... Qd8-e7 2. Qa7-a4 Rc8-d8 3. Be3xc5 Bb4xc5 4. Rc1xc5 Rd7-d4 5. Rc5-c4 Bh3xf5 6. Rc4xd4 e5xd4 7. Qa4-a5 Bf5-h3 8. Ra1-c1 Qe7-h4 9. Rc1-c7 = (-1.01) Depth: 17/39 00:14:25.88 2688520kN (3105 KN/s, 14093 splits, 1179 aborts) with SE: 1... Bh3xf5 2. Bf3xb7 Rc8-b8[S] 3. Bb7-c6 Rd7xa7[S] 4. b6xa7 Rb8-a8 5. Be3xc5 Bf5-h3 6. Rc1-b1 Qd8-g5 7. Kg1-h1 e5-e4 8. Bc6xe4 Bb4-c3 9. Be4xa8 Qg5xc5 10. Rb1-b8 = (-0.78) Depth: 13/34 00:00:26.98 81118kN (3006 KN/s, 6469 splits, 683 aborts) 1... Bh3xf5 2. Bf3xb7[S] Rc8-b8[S] 3. Bb7-c6 Rd7xa7[S] 4. b6xa7 Rb8-a8 5. Bc6xa8 Qd8xa8 6. Be3xc5 Bb4xc5 7. Rc1xc5 Bf5-h3 8. f2-f3 Kh8-g8 9. Ra1-a5 Kg8-f7 = (-2.18) Depth: 14/39 00:01:00.20 186791kN (3102 KN/s, 9725 splits, 1039 aborts) 1 ...Qd8-e7!! = (-2.17) Depth: 14/39 00:01:06.57 207894kN (3123 KN/s, 10153 splits, 1067 aborts) 1... Qd8-e7 2. Qa7-a4 Rc8-d8 3. Qa4-c2 Qe7-e8 4. Bf3-e4 Qe8-h5[S] 5. Kg1-h1 Bh3xf5 6. Be4xf5 Qh5xf5[S] 7. Be3xc5 Bb4xc5 8. Qc2xc5 Rd8-f8 9. f2-f3 = (-1.06) Depth: 14/39 00:01:50.89 346824kN (3127 KN/s, 11339 splits, 1198 aborts) 1... Qd8-e7 2. Qa7-a4 Rc8-d8 3. Qa4-c2 Qe7-e8 4. Bf3-e4 Qe8-h5[S] 5. Kg1-h1 Bh3xf5 6. Be4xf5 Qh5xf5[S] 7. Be3xc5 Bb4xc5 8. Qc2xc5 Rd8-f8 9. f2-f3 = (-1.06) Depth: 14/39 00:02:42.32 500853kN (3086 KN/s, 18166 splits, 2098 aborts) So SE pretty much kick ass here. The parallel speedup is only 2.9 / 4 (scaling 3.8 / 4) though :( anthony
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