Author: Andrew Williams
Date: 16:28:07 08/30/00
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On August 30, 2000 at 16:01:52, Peter McKenzie wrote: >This position is what could have happened in Nimzo - Shredder in London. >Is from the possible variation 24...Qxb4 25.Qxd5 > >Even this position requires 13ply (about 7.5 hours on my P133) for Lambchop to >return a really bad score (see output below). I'd be interested in how other >programs go on this position. (Note the terrible branching factor at depth 12 >and 13) > >[D]r3rb1k/6p1/p2p3p/1ppQ4/Pq6/5NRP/5PP1/1B2R1K1 b - - > > _______________________ Black to play > 8 |br|__|__|__|br|bb|__|bk| > 7 |__|__|__|__|__|__|bp|__| > 6 |bp|__|__|bp|__|__|__|bp| > 5 |__|bp|bp|WQ|__|__|__|__| > 4 |WP|bq|__|__|__|__|__|__| > 3 |__|__|__|__|__|WN|WR|WP| > 2 |__|__|__|__|__|WP|WP|__| > 1 |__|WB|__|__|WR|__|WK|__| > a b c d e f g h > >Depth, score, time, nodes > > 0 0 0 0 e8e1 > 1 204 0 57 e8e1 f3e1 b4e1 g1h2 > 2 204 0 228 e8e1 f3e1 b4e1 g1h2 > 3 225 0 487 e8e1 f3e1 b4e1 g1h2 a8e8 > 4 280 0 1451 e8e1 f3e1 a8e8 g1h2 b4b1 > 5 209 100 5007 e8e1 f3e1 a8e8 d5f5 e8e1 g1h2 h8g8 f5h7 g8f7 h7g6 f7e7 > 6 209 200 10404 e8e1 f3e1 a8e8 d5f5 e8e1 g1h2 h8g8 > 7 73 700 68142 e8e1 f3e1 b4e1 g1h2 e1b1 d5a8 b1f5 g3f3 f5e5 h2h1 > 8 73 1100 118111 e8e1 f3e1 b4e1 g1h2 e1e8 d5d3 g7g6 > 9 32 2600 286579 e8e1 f3e1 b4e1 g1h2 e1e8 g3e3 e8b8 d5f5 d6d5 h2h1 g7g6 f5g >6 >10 -25 7200 826264 e8e1 f3e1 b4e1 g1h2 e1e8 g3e3 e8d8 d5d3 g7g6 d3g6 a8a7 b1a >2 >11 32 14700 1740365 e8e1 f3e1 b4e1 g1h2 e1e8 g3e3 e8b8 d5f5 g7g6 f5g6 b8b7 > >12 -19 441600 53229976 e8e1 f3e1 b4e1 g1h2 e1e8 g3e3 e8d8 d5d3 g7g6 d3g6 d8d7 b >1e4 d6d5 g6f6 h8g8 > >13 -112 2648900 320991614 e8e1 f3e1 a8e8 d5f5 e8e1 g1h2 h8g8 f5h7 g8f7 g3f3 f7e8 >Q b1g6 e8d7 f3f8 e1e7 a4b5 a6b5 h7g8 b4c4 g6f5 d7c7 Hi Pete, For me, the big explosion occurs when looking at ply 14. Columns are depth, score, seconds, nodes and PV. Here is PostModernist's output: 1= 228 0 146 1... Rxe1 2. Nxe1 Qxe1 2= 228 0 185 1... Rxe1 2. Nxe1 Qxe1 3= 251 0 842 1... Rxe1 2. Nxe1 Qxe1 3. Kh2 Re8 4= 345 0 2817 1... Rxe1 2. Nxe1 Qxe1 3. Kh2 Rb8 4. axb5 Qxb1 5. bxa6 5= 366 0 7264 1... Rxe1 2. Nxe1 Re8 3. axb5 Rxe1 4. Kh2 Qxb1 5. bxa6 6= 244 1 51580 1... Rxe1 2. Nxe1 Re8 3. Qf5 Qxe1 4. Kh2 Kg8 5. Qh7 Kf7 7= 210 2 100367 1... Rxe1 2. Nxe1 Qxe1 3. Kh2 Qe8 4. Bg6 Qc8 5. Bf5 Qe8 8= 189 5 197128 1... Rxe1 2. Nxe1 Qxe1 3. Kh2 Qe8 4. Qd3 g6 5. axb5 axb5 6. Rxg6 c4 7. Qe4 9= 105 19 777036 1... Rxe1 2. Nxe1 Qxe1 3. Kh2 Qe8 4. axb5 axb5 5. Qd3 g6 6. Rxg6 Ra7 7. Rg4 10= 41 46 2299297 1... Rxe1 2. Nxe1 Qxe1 3. Kh2 Qe8 4. Re3 Qb8 5. Qf5 g6 6. Qxg6 d5 7. Rg3 b4 11= 38 69 3406422 1... Rxe1 2. Nxe1 Qxe1 3. Kh2 Qe8 4. Re3 Qb8 5. Qf5 g6 6. Qxg6 Qc7 7. axb5 d5 8. Rg3 12= 52 159 7480048 1... Rxe1 2. Nxe1 Qxe1 3. Kh2 Qe8 4. Re3 Qb8 5. Qf5 g6 6. Qxg6 Qc7 7. axb5 13= 19 583 25066773 1... Rxe1 2. Nxe1 Qxe1 3. Kh2 Qe8 4. Re3 Qb8 5. Qf5 g6 6. Qxg6 Qc7 7. axb5 axb5 8. Rg3 14= -192 10688 385221785 1... Rxe1 2. Nxe1 Qxe1 3. Kh2 Qe8 4. Re3 Qb8 5. Qd3 d5 6. Kg1 g6 7. Qxg6 Cheers Andrew
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