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Subject: Re: 2 hours a position

Author: Dann Corbit

Date: 14:25:11 11/12/01

Go up one level in this thread


On November 10, 2001 at 16:37:18, Slater Wold wrote:

>On November 10, 2001 at 00:23:30, Dann Corbit wrote:
>
>
>>[D]r2r2k1/1R2qp2/p5pp/2P5/b1PN1b2/P7/1Q3PPP/1B1R2K1 b - -
>>[D]r2r2k1/1R3p2/p5pp/2P1q3/b1PN1b2/P7/1Q3PPP/1B1R2K1 w - -
>>[D]1r1r2k1/1R2qp2/p5pp/2P5/b1PN1b2/P7/1Q3PPP/1B1R2K1 w - -
>
>The short version:
>
>r2r2k1/1R2qp2/p5pp/2P5/b1PN1b2/P7/1Q3PPP/1B1R2K1 b - - acd 17; acn -1884112396;
>acs 7205; bm Rab8; ce 395; id "Corbit-Question1"; pv Rab8 Rxe7 Rxb2 Rf1 Rxd4 Re4
>Rbd2 g3 Bb8 Re7 Bc6 Bxg6 fxg6 Re6 Bd7 Rxg6+ Kf7 Rb6;
>r2r2k1/1R3p2/p5pp/2P1q3/b1PN1b2/P7/1Q3PPP/1B1R2K1 w - - acd 16; acn -648315288;
>acs 7204; bm Bc2; ce -349; id "Corbit-Question2"; pv Bc2 Bxc2 Qxc2 Rxd4 g3 Rad8
>Rf1 Rd2 Qb1 Qe2 Qe1 Qf3 Re7 Bg5 Qe4 Qxa3;
>1r1r2k1/1R2qp2/p5pp/2P5/b1PN1b2/P7/1Q3PPP/1B1R2K1 w - - acd 19; acn 2128444622;
>acs 7201; bm Rxe7; ce -455; id "Corbit-Question3"; pv Rxe7 Rxb2 Rf1 Rxd4 Re4
>Rbd2 g3 Bg5 Rfe1 Bf6 R4e3 a5 Rf3 Kg7 Rc3 Rd7 Rf3 Bd4 Be4 Bxc5;
>
>
>The long version:
>
>max threads set to 2
>hash table memory = 768M bytes.
>pawn hash table memory = 80M bytes.
>choose from 2 best moves.
>6 piece tablebase files found
>26330kb of RAM used for TB indices and decompression tables
>EGTB cache memory = 32M bytes.
>
>
>Crafty v18.13 (2 cpus)
>
>White(1): st 7200
>search time set to 7200.00.
>White(1): epdpfga corbit.epd corbit.out
>PFGA: EPD record: 1   ID: Corbit-Question1
>middle-game phase
>              clearing hash tables
>              time surplus   0.00  time limit 120:00 (120:00)
>         nss  depth   time  score   variation (1)
>starting thread 1
>                6     0.17  -2.49   1. ... Qe5 2. Bc2 Bxc2 3. Qxc2 Rxd4
>                                    4. g3 Rxd1+ 5. Qxd1 Qg5
>         (2)    6->   0.22  -2.49   1. ... Qe5 2. Bc2 Bxc2 3. Qxc2 Rxd4
>                                    4. g3 Rxd1+ 5. Qxd1 Qg5
>                7     0.27     --   1. ... Qe5
>                7     0.33  -2.06   1. ... Qe5 2. Bc2 Bxc2 3. Qxc2 Rxd4
>                                    4. g3 Rxd1+ 5. Qxd1 Qg5 6. c6
>                7     0.46  -2.32   1. ... Rxd4 2. Qxd4 Qxb7 3. Re1 Re8
>                                    4. Rxe8+ Bxe8 5. Bxg6 Bxh2+ 6. Kxh2
>                                    fxg6
>                7     0.69     ++   1. ... Rab8!!
>                7     0.75  -2.96   1. ... Rab8 2. Rxe7 Rxb2 3. Rde1 Rxd4
>                                    4. g3 Bd2
>         (4)    7->   0.75  -2.96   1. ... Rab8 2. Rxe7 Rxb2 3. Rde1 Rxd4
>                                    4. g3 Bd2
>                8     0.92     ++   1. ... Rab8!!
>         (3)    8     1.10  -3.58   1. ... Rab8 2. Rxe7 Rxb2 3. Rde1 Rxd4
>                                    4. Be4 Bd2 5. Re2 Rxc4
>                8->   1.39  -3.58   1. ... Rab8 2. Rxe7 Rxb2 3. Rde1 Rxd4
>                                    4. Be4 Bd2 5. Re2 Rxc4
>                9     1.80  -3.56   1. ... Rab8 2. Rxe7 Rxb2 3. Rf1 Rxd4
>                                    4. Re4 Rxe4 5. Bxe4 Re2 6. f3
>         (2)    9->   2.71  -3.56   1. ... Rab8 2. Rxe7 Rxb2 3. Rf1 Rxd4
>                                    4. Re4 Rxe4 5. Bxe4 Re2 6. f3
>               10     3.56  -3.61   1. ... Rab8 2. Rxe7 Rxb2 3. Rf1 Rxd4
>                                    4. Re4 Rxe4 5. Bxe4 Re2 6. Bf3 Rd2
>         (2)   10->   6.27  -3.61   1. ... Rab8 2. Rxe7 Rxb2 3. Rf1 Rxd4
>                                    4. Re4 Rxe4 5. Bxe4 Re2 6. Bf3 Rd2
>               11     7.69  -3.30   1. ... Rab8 2. Rxe7 Rxb2 3. Rf1 Rxd4
>                                    4. Re4 Rxe4 5. Bxe4 Re2 6. Bf3 Ra2
>                                    7. Bb7
>         (4)   11->  16.81  -3.30   1. ... Rab8 2. Rxe7 Rxb2 3. Rf1 Rxd4
>                                    4. Re4 Rxe4 5. Bxe4 Re2 6. Bf3 Ra2
>                                    7. Bb7
>         (3)   12    20.39  -3.46   1. ... Rab8 2. Rxe7 Rxb2 3. Rf1 Rxd4
>                                    4. Re4 Rxe4 5. Bxe4 Re2 6. Bf3 Rd2
>                                    7. g3 Be5
>         (4)   12->  42.00  -3.46   1. ... Rab8 2. Rxe7 Rxb2 3. Rf1 Rxd4
>                                    4. Re4 Rxe4 5. Bxe4 Re2 6. Bf3 Rd2
>                                    7. g3 Be5
>         (3)   13    50.38  -3.55   1. ... Rab8 2. Rxe7 Rxb2 3. Rf1 Rxd4
>                                    4. Re4 Rbd2 5. g3 Bg5 6. Rfe1 Rd1 7.
>                                    Rf1 Bc6 8. Rxd1 Rxd1+
>         (4)   13->   1:53  -3.55   1. ... Rab8 2. Rxe7 Rxb2 3. Rf1 Rxd4
>                                    4. Re4 Rbd2 5. g3 Bg5 6. Rfe1 Rd1 7.
>                                    Rf1 Bc6 8. Rxd1 Rxd1+
>         (3)   14     2:14  -3.67   1. ... Rab8 2. Rxe7 Rxb2 3. Rf1 Rxd4
>                                    4. Re4 Rbd2 5. g3 Bc7 6. Re7 Ba5 7.
>                                    Re4 Bc6 8. Rxd4 Rxd4
>         (4)   14->   4:47  -3.67   1. ... Rab8 2. Rxe7 Rxb2 3. Rf1 Rxd4
>                                    4. Re4 Rbd2 5. g3 Bc7 6. Re7 Ba5 7.
>                                    Re4 Bc6 8. Rxd4 Rxd4
>         (3)   15     5:42  -3.88   1. ... Rab8 2. Rxe7 Rxb2 3. Rf1 Rxd4
>                                    4. Re4 Rbd2 5. Rfe1 Bc6 6. Rxd4 Rxd4
>                                    7. g3 Bd2 8. Re7 Rxc4 9. Bd3
>         (4)   15->  14:26  -3.88   1. ... Rab8 2. Rxe7 Rxb2 3. Rf1 Rxd4
>                                    4. Re4 Rbd2 5. Rfe1 Bc6 6. Rxd4 Rxd4
>                                    7. g3 Bd2 8. Re7 Rxc4 9. Bd3
>         (3)   16    16:53  -4.02   1. ... Rab8 2. Rxe7 Rxb2 3. Rf1 Rxd4
>                                    4. Re4 Rbd2 5. g3 Bb8 6. Re7 Bc6 7.
>                                    Bxg6 fxg6 8. Re6 Bd7 9. Rxg6+ Kf7 10.
>                                    Rxh6 Rxc4
>         (4)   16->  43:43  -4.02   1. ... Rab8 2. Rxe7 Rxb2 3. Rf1 Rxd4
>                                    4. Re4 Rbd2 5. g3 Bb8 6. Re7 Bc6 7.
>                                    Bxg6 fxg6 8. Re6 Bd7 9. Rxg6+ Kf7 10.
>                                    Rxh6 Rxc4
>         (3)   17    48:41  -3.95   1. ... Rab8 2. Rxe7 Rxb2 3. Rf1 Rxd4
>                                    4. Re4 Rbd2 5. g3 Bb8 6. Re7 Bc6 7.
>                                    Bxg6 fxg6 8. Re6 Bd7 9. Rxg6+ Kf7 10.
>                                    Rb6
>              time=120:01  cpu=200%  mat=2  n=2410854900  fh=93%  nps=334k
>              ext-> chk=732474797 cap=18700422 pp=4500100 1rep=64305645
>mate=4930458
>              predicted=0  nodes=2410854900  evals=2400450405
>              endgame tablebase-> probes done=0  successful=0
>              hashing-> trans/ref=25%  pawn=99%  used=14%
>              SMP->  split=3239  stop=478  data=11/32  cpu=240:52  elap=120:01
>PFGA: EPD record: 2   ID: Corbit-Question2
>              clearing hash tables
>              time surplus   0.00  time limit 120:00 (120:00) [easy move]
>         nss  depth   time  score   variation (1)
>                2     0.00 -Mat01   1. Rd3 Qe1#
>                2     0.00  -2.41   1. Bc2 Bxc2 2. Qxc2 Rxd4 3. Rxd4 Qxd4
>                6     0.10  -2.06   1. Bc2 Bxc2 2. Qxc2 Rxd4 3. g3 Rxd1+
>                                    4. Qxd1 Qe4 5. Qd7
>                6->   0.13  -2.06   1. Bc2 Bxc2 2. Qxc2 Rxd4 3. g3 Rxd1+
>                                    4. Qxd1 Qe4 5. Qd7
>                7     0.14     --   1. Bc2
>                7     0.22  -2.60   1. Bc2 Bxc2 2. Qxc2 Rxd4 3. g3 Qf5
>                                    4. Qb1 Rxd1+ 5. Qxd1 Rb8 6. Rxb8+ <HT>
>                7->   0.35  -2.60   1. Bc2 Bxc2 2. Qxc2 Rxd4 3. g3 Qf5
>                                    4. Qb1 Rxd1+ 5. Qxd1 Rb8 6. Rxb8+ <HT>
>                8     0.47  -2.41   1. Bc2 Bxc2 2. Qxc2 Rxd4 3. g3 Qf5
>                                    4. Qb1 Rxd1+ 5. Qxd1 Rb8 6. c6
>                8->   0.74  -2.41   1. Bc2 Bxc2 2. Qxc2 Rxd4 3. g3 Qf5
>                                    4. Qb1 Rxd1+ 5. Qxd1 Rb8 6. c6
>                9     1.10  -2.40   1. Bc2 Bxc2 2. Qxc2 Rxd4 3. g3 Qf5
>                                    4. Qe2 Qe6 5. Re1 Qc6
>                9->   1.72  -2.40   1. Bc2 Bxc2 2. Qxc2 Rxd4 3. g3 Qf5
>                                    4. Qe2 Qe6 5. Re1 Qc6
>               10     2.57  -2.33   1. Bc2 Bxc2 2. Qxc2 Rxd4 3. g3 Qf5
>                                    4. Qe2 Qe6 5. Re1 Qxe2 6. Rxe2 Rb8
>                                    7. Rxb8+ Bxb8
>               10->   3.94  -2.33   1. Bc2 Bxc2 2. Qxc2 Rxd4 3. g3 Qf5
>                                    4. Qe2 Qe6 5. Re1 Qxe2 6. Rxe2 Rb8
>                                    7. Rxb8+ Bxb8
>               11     5.61  -2.43   1. Bc2 Bxc2 2. Qxc2 Rxd4 3. g3 Qf5
>                                    4. Qe2 Qe6 5. Qf3 Rxd1+ 6. Qxd1 Be5
>                                    7. f4 Rb8 8. Rxb8+ Bxb8
>         (2)   11->   9.79  -2.43   1. Bc2 Bxc2 2. Qxc2 Rxd4 3. g3 Qf5
>                                    4. Qe2 Qe6 5. Qf3 Rxd1+ 6. Qxd1 Be5
>                                    7. f4 Rb8 8. Rxb8+ Bxb8
>               12    16.44  -2.34   1. Bc2 Bxc2 2. Qxc2 Rxd4 3. g3 Bg5
>                                    4. c6 Qf5 5. Qa4 Rd2 6. Rxd2 Bxd2 7.
>                                    Rd7 Bc3
>         (2)   12->  33.50  -2.34   1. Bc2 Bxc2 2. Qxc2 Rxd4 3. g3 Bg5
>                                    4. c6 Qf5 5. Qa4 Rd2 6. Rxd2 Bxd2 7.
>                                    Rd7 Bc3
>               13    38.94     --   1. Bc2
>               13     1:17  -3.01   1. Bc2 Bxc2 2. Qxc2 Rxd4 3. g3 Rad8
>                                    4. Rf1 Qe6 5. Rb6 Qg4 6. h3 Qg5 7.
>                                    Rxa6 Rd2
>         (3)   13->   3:17  -3.01   1. Bc2 Bxc2 2. Qxc2 Rxd4 3. g3 Rad8
>                                    4. Rf1 Qe6 5. Rb6 Qg4 6. h3 Qg5 7.
>                                    Rxa6 Rd2
>         (2)   14     3:55  -2.98   1. Bc2 Bxc2 2. Qxc2 Rxd4 3. g3 Rad8
>                                    4. Rf1 Bg5 5. c6 Qc5 6. c7 Rc8 7. h4
>                                    Bf6 8. Qa4 Rxc7 9. Rxc7 Qxc7 10. Qxa6
>         (4)   14->   6:59  -2.98   1. Bc2 Bxc2 2. Qxc2 Rxd4 3. g3 Rad8
>                                    4. Rf1 Bg5 5. c6 Qc5 6. c7 Rc8 7. h4
>                                    Bf6 8. Qa4 Rxc7 9. Rxc7 Qxc7 10. Qxa6
>               15     7:27     --   1. Bc2
>         (3)   15    26:33  -3.49   1. Bc2 Bxc2 2. Qxc2 Rxd4 3. g3 Rad8
>                                    4. Rf1 Rd2 5. Qb1 Qe2 6. Qe1 Qf3 7.
>                                    Re7 Bg5 8. Qe4 Qxa3
>               15->  39:42  -3.49   1. Bc2 Bxc2 2. Qxc2 Rxd4 3. g3 Rad8
>                                    4. Rf1 Rd2 5. Qb1 Qe2 6. Qe1 Qf3 7.
>                                    Re7 Bg5 8. Qe4 Qxa3
>               16    40:44     --   1. Bc2

We have an unresolved fail-low here.  This (and the Shredder result post) have
convinced me that the alternative move is just as good or maybe better.  A bit
more research might find out for sure, especially if a mate can be found.

>              time=120:01  cpu=199%  mat=2  n=3646652008  fh=97%  nps=506k
>              ext-> chk=1172314596 cap=15516845 pp=21076518 1rep=147781111
>mate=2239309
>              predicted=0  nodes=3646652008  evals=1116645551
>              endgame tablebase-> probes done=0  successful=0
>              hashing-> trans/ref=33%  pawn=99%  used=14%
>              SMP->  split=5998  stop=588  data=14/32  cpu=239:59  elap=120:01
>PFGA: EPD record: 3   ID: Corbit-Question3
>              time surplus   0.00  time limit 120:00 (120:00)
>         nss  depth   time  score   variation (1)
>         (4)    6->   0.11  -2.96   1. Rxe7 Rxb2 2. Rde1 Rxd4 3. g3 Bd2
>                7     0.13     --   1. Rxe7
>         (3)    7     0.14  -3.58   1. Rxe7 Rxb2 2. Rde1 Rxd4 3. Be4 Bd2
>                                    4. Re2 Rxc4
>         (4)    7->   0.32  -3.58   1. Rxe7 Rxb2 2. Rde1 Rxd4 3. Be4 Bd2
>                                    4. Re2 Rxc4
>         (3)    8     0.38  -3.56   1. Rxe7 Rxb2 2. Rf1 Rxd4 3. Re4 Rxe4
>                                    4. Bxe4 Re2 5. f3
>         (4)    8->   0.75  -3.56   1. Rxe7 Rxb2 2. Rf1 Rxd4 3. Re4 Rxe4
>                                    4. Bxe4 Re2 5. f3
>         (3)    9     0.86  -3.61   1. Rxe7 Rxb2 2. Rf1 Rxd4 3. Re4 Rxe4
>                                    4. Bxe4 Re2 5. Bf3 Rd2
>         (4)    9->   1.61  -3.61   1. Rxe7 Rxb2 2. Rf1 Rxd4 3. Re4 Rxe4
>                                    4. Bxe4 Re2 5. Bf3 Rd2
>         (3)   10     1.83  -3.30   1. Rxe7 Rxb2 2. Rf1 Rxd4 3. Re4 Rxe4
>                                    4. Bxe4 Re2 5. Bf3 Ra2 6. Bb7
>         (3)   10->   3.03  -3.30   1. Rxe7 Rxb2 2. Rf1 Rxd4 3. Re4 Rxe4
>                                    4. Bxe4 Re2 5. Bf3 Ra2 6. Bb7
>         (2)   11     3.50  -3.46   1. Rxe7 Rxb2 2. Rf1 Rxd4 3. Re4 Rxe4
>                                    4. Bxe4 Re2 5. Bf3 Rd2 6. g3 Be5
>         (3)   11->   6.57  -3.46   1. Rxe7 Rxb2 2. Rf1 Rxd4 3. Re4 Rxe4
>                                    4. Bxe4 Re2 5. Bf3 Rd2 6. g3 Be5
>         (2)   12     7.85  -3.55   1. Rxe7 Rxb2 2. Rf1 Rxd4 3. Re4 Rbd2
>                                    4. g3 Bg5 5. Rfe1 Rd1 6. Rf1 Bc6 7.
>                                    Rxd1 Rxd1+
>         (3)   12->  14.74  -3.55   1. Rxe7 Rxb2 2. Rf1 Rxd4 3. Re4 Rbd2
>                                    4. g3 Bg5 5. Rfe1 Rd1 6. Rf1 Bc6 7.
>                                    Rxd1 Rxd1+
>         (2)   13    17.16  -3.67   1. Rxe7 Rxb2 2. Rf1 Rxd4 3. Re4 Rbd2
>                                    4. g3 Bc7 5. Re7 Ba5 6. Re4 Bc6 7.
>                                    Rxd4 Rxd4
>         (4)   13->  34.55  -3.67   1. Rxe7 Rxb2 2. Rf1 Rxd4 3. Re4 Rbd2
>                                    4. g3 Bc7 5. Re7 Ba5 6. Re4 Bc6 7.
>                                    Rxd4 Rxd4
>         (3)   14    41.07  -3.88   1. Rxe7 Rxb2 2. Rf1 Rxd4 3. Re4 Rbd2
>                                    4. Rfe1 Bc6 5. Rxd4 Rxd4 6. g3 Bd2
>                                    7. Re7 Rxc4 8. Bd3
>         (4)   14->   1:25  -3.88   1. Rxe7 Rxb2 2. Rf1 Rxd4 3. Re4 Rbd2
>                                    4. Rfe1 Bc6 5. Rxd4 Rxd4 6. g3 Bd2
>                                    7. Re7 Rxc4 8. Bd3
>         (3)   15     1:43  -4.02   1. Rxe7 Rxb2 2. Rf1 Rxd4 3. Re4 Rbd2
>                                    4. g3 Bb8 5. Re7 Bc6 6. Bxg6 fxg6 7.
>                                    Re6 Bd7 8. Rxg6+ Kf7 9. Rxh6 Rxc4
>         (3)   15->   3:40  -4.02   1. Rxe7 Rxb2 2. Rf1 Rxd4 3. Re4 Rbd2
>                                    4. g3 Bb8 5. Re7 Bc6 6. Bxg6 fxg6 7.
>                                    Re6 Bd7 8. Rxg6+ Kf7 9. Rxh6 Rxc4
>         (2)   16     4:13  -3.95   1. Rxe7 Rxb2 2. Rf1 Rxd4 3. Re4 Rbd2
>                                    4. g3 Bb8 5. Re7 Bc6 6. Bxg6 fxg6 7.
>                                    Re6 Bd7 8. Rxg6+ Kf7 9. Rb6
>         (4)   16->   7:43  -3.95   1. Rxe7 Rxb2 2. Rf1 Rxd4 3. Re4 Rbd2
>                                    4. g3 Bb8 5. Re7 Bc6 6. Bxg6 fxg6 7.
>                                    Re6 Bd7 8. Rxg6+ Kf7 9. Rb6
>         (3)   17     9:34  -4.19   1. Rxe7 Rxb2 2. Rf1 Rxd4 3. Re4 Rbd2
>                                    4. g3 Bg5 5. Rxd4 Rxd4 6. Re1 Rxc4
>                                    7. f4 Bf6 8. Bd3 Rxc5 9. Bxa6 Rc2
>         (4)   17->  21:50  -4.19   1. Rxe7 Rxb2 2. Rf1 Rxd4 3. Re4 Rbd2
>                                    4. g3 Bg5 5. Rxd4 Rxd4 6. Re1 Rxc4
>                                    7. f4 Bf6 8. Bd3 Rxc5 9. Bxa6 Rc2
>         (3)   18    25:32  -4.18   1. Rxe7 Rxb2 2. Rf1 Rxd4 3. Re4 Rbd2
>                                    4. g3 Bg5 5. Rxd4 Rxd4 6. Re1 Rxc4
>                                    7. f4 Bf6 8. Bd3 Rxc5 9. Bxa6 Rc3 10.
>                                    Ra1
>         (3)   18->  49:07  -4.18   1. Rxe7 Rxb2 2. Rf1 Rxd4 3. Re4 Rbd2
>                                    4. g3 Bg5 5. Rxd4 Rxd4 6. Re1 Rxc4
>                                    7. f4 Bf6 8. Bd3 Rxc5 9. Bxa6 Rc3 10.
>                                    Ra1
>         (2)   19    65:41  -4.55   1. Rxe7 Rxb2 2. Rf1 Rxd4 3. Re4 Rbd2
>                                    4. g3 Bg5 5. Rfe1 Bf6 6. R4e3 a5 7.
>                                    Rf3 Kg7 8. Rc3 Rd7 9. Rf3 Bd4 10. Be4
>                                    Bxc5
>              time=120:01  cpu=199%  mat=2  n=2128444622  fh=91%  nps=295k
>              ext-> chk=508501093 cap=19866861 pp=22533953 1rep=54288298
>mate=5926822
>              predicted=0  nodes=2128444622  evals=3390118556
>              endgame tablebase-> probes done=0  successful=0
>              hashing-> trans/ref=26%  pawn=99%  used=14%
>              SMP->  split=4659  stop=739  data=11/32  cpu=239:59  elap=120:01
>White(1): end
>execution complete.
>
>This was the Leiden version of Crafty.



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