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Subject: An interesting position. Sudden improvement at ply 15 switches to Bxe6!

Author: Dann Corbit

Date: 16:47:39 07/13/00


This is run on a *very* slow machine (gets about 50K NPS on average), but it
runs 24x7 at ten hours each position.  I am running a collection of interesting
positions, and found one where the suggested solution seems to be bettered by an
alternative choice.  I would be interested to see if other engines find the
solution sooner.

[D] r1n1kb1r/1b3pp1/1qn1p3/p2pP1Bp/Qp1P1N1P/5NPB/PP3P2/2R1R1K1 w kq - bm Nxe6;
id "Mike's computer test 2: 0032";

PFGA: EPD record: 32   ID: Mike's computer test 2: 0032
              clearing hash tables
              time surplus   0.00  time limit 600:00 (600:00)
         nss  depth   time  score   variation (1)
                7     3.00   0.75   1. Re2 Qc7 2. Rec2 Na7 3. Bg2 Rc8 4.
                                    Nd2
                7->   4.98   0.75   1. Re2 Qc7 2. Rec2 Na7 3. Bg2 Rc8 4.
                                    Nd2
                8     6.99   0.80   1. Re2 Qc7 2. Rec2 Na7 3. Nxe6 fxe6
                                    4. Bxe6 b3 5. Qxb3
                8->  21.45   0.80   1. Re2 Qc7 2. Rec2 Na7 3. Nxe6 fxe6
                                    4. Bxe6 b3 5. Qxb3
                9    27.45   0.80   1. Re2 Qc7 2. Rec2 Na7 3. Nxe6 fxe6
                                    4. Bxe6 b3 5. Qxb3
                9->  41.79   0.80   1. Re2 Qc7 2. Rec2 Na7 3. Nxe6 fxe6
                                    4. Bxe6 b3 5. Qxb3
               10     1:32   0.92   1. Re2 Na7 2. Rec2 Qc7 3. Nxe6 fxe6
                                    4. Bxe6 <HT>
               10->   2:12   0.92   1. Re2 Na7 2. Rec2 Qc7 3. Nxe6 fxe6
                                    4. Bxe6 <HT>
               11     4:01   0.85   1. Re2 Na7 2. Rec2 Rb8 3. Kh1 Be7 4.
                                    Bxe7 Kxe7 5. Rc5 Qc7 6. Qc2 Rbc8
               11->   6:02   0.85   1. Re2 Na7 2. Rec2 Rb8 3. Kh1 Be7 4.
                                    Bxe7 Kxe7 5. Rc5 Qc7 6. Qc2 Rbc8
               12    10:29   0.89   1. Re2 Na7 2. Rec2 Nb5 3. Bg2 Nba7
                                    4. Bf1 Qc7 5. Nd3 Rc8 6. Nc5 Be7 7.
                                    Nxb7 Bxg5 8. hxg5 Qxb7
               12    14:49   0.95   1. Nxe6 fxe6 2. Bxe6 Ne7 3. Bxe7 Kxe7
                                    4. Bxd5 Rc8 5. e6 Kf6 6. Qd1 Be7 7.
                                    Qd3
               12->  17:34   0.95   1. Nxe6 fxe6 2. Bxe6 Ne7 3. Bxe7 Kxe7
                                    4. Bxd5 Rc8 5. e6 Kf6 6. Qd1 Be7 7.
                                    Qd3
               13    19:09   0.78   1. Nxe6 fxe6 2. Bxe6 Ne7 3. Bxe7 Kxe7
                                    4. Bxd5 Rc8 5. e6 Kf6 6. Rc4 Be7 7.
                                    Rec1 Na7 8. Bxb7 Qxb7
               13    44:43   0.90   1. Re2 Na7 2. Rec2 Nb5 3. Bg2 Nba7
                                    4. Qb3 a4 5. Qe3 Qc7 <HT>
               13->  66:37   0.90   1. Re2 Na7 2. Rec2 Nb5 3. Bg2 Nba7
                                    4. Qb3 a4 5. Qe3 Qc7 <HT>
               14    92:29   0.89   1. Re2 Na7 2. Rec2 Nb5 3. Bf5 Rb8 4.
                                    Bd3 Nba7 5. Bf1 Rc8 6. Nd3 Qc7 7. Nc5
                                    Be7 8. Nxb7 Bxg5 9. hxg5 Qxb7
               14-> 160:46   0.89   1. Re2 Na7 2. Rec2 Nb5 3. Bf5 Rb8 4.
                                    Bd3 Nba7 5. Bf1 Rc8 6. Nd3 Qc7 7. Nc5
                                    Be7 8. Nxb7 Bxg5 9. hxg5 Qxb7
               15   207:02   0.88   1. Re2 Na7 2. Rec2 Nb5 3. Bf5 Rb8 4.
                                    Bh3 Nba7 5. Nd2 Qc7 6. Nxe6 fxe6 7.
                                    Bxe6 Be7 8. Bxd5 Bxg5 9. hxg5
               15   359:58     ++   1. Bxe6!!



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