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Subject: Re: two ECM98 questions

Author: Dann Corbit

Date: 19:19:08 11/03/03

Go up one level in this thread


On November 03, 2003 at 21:37:36, Dann Corbit wrote:
[snip]
>>[D]5r2/pp1RRrk1/4Qq1p/1PP3p1/8/4B3/1b3P1P/6K1 w - - 0 1
>>
>>intended solution: 1.Qxf7+ Rxf7 2.Rxf7+ Qxf7 3.c6! bc6 4.bc6 Be5 5.Bd4! +-
>>alternate solution: 1.Rxf7 Rxf7 2.Qxf7+ Qxf7 transposes
>
>First two solutions are clearly transpositions.  The third choice also appears
>to win.
>
>5r2/pp1RRQk1/5q1p/1PP3p1/8/4B3/1b3P1P/6K1 b - - acd 18; acn 72608893; acs 121;
>ce -437; pv Rxf7 Rxf7+ Qxf7 c6 bxc6 bxc6 Be5 Bd4 Bxd4 Rxf7+ Kxf7 c7 Bb6 c8=Q Kf6
>Qh8+ Kg6 Qg8+ Kh5 Kg2 Kh4 Qe6 Kh5 Kf3;

Ruffian analysis of the non-transposition alternative:

E:\programme\winboard\Arena\Engines\Ruffian>ruffian_105 -h 300M -T \hmm.epd -t
999 -p 99
Hash size 314572800
Ruffian 1.0.5
feature done=0
Loading configuration: ruffian.cfg
Logfile: Mon Nov 03 19:00:48 2003
Total hash size 300M
Initializing tablebases: e:/programme/winboard/nalimov
Testing \hmm.epd, 999 seconds, extra ply 99
Testing: test 1   Solution: Rxe7

[D]5r2/pp1RRrk1/5q1p/1PP3p1/4Q3/4B3/1b3P1P/6K1 b - -
  Depth   Time  Score    Best line
   8/20   1.04   x.xx    ... Rxe7
   8-->   1.89  -2.15    ... a6 b6 Qc6 Bd4+ Bxd4 Qxd4+ Kg8 Rxb7 Qxb7 Rxb7
                         Rxb7
   9/21   2.08     --    ... a6
   9/21   3.52  -3.82    ... a6 Rxf7+ Rxf7 Qxb7 Rxd7 Qxd7+ Kh8 c6 Be5 b6 Qg6
                         c7 Qb1+ Kg2
   9/21   3.60   x.xx    ... Rxe7
   9/21   4.01  -2.43    ... Rxe7 Rxe7+ Rf7 Rxb7 Bc3 c6 Rxb7 cxb7 Qd6 Bxa7
                         Qd1+ Kg2
   9-->   5.39  -2.43    ... Rxe7 Rxe7+ Rf7 Rxb7 Bc3 c6 Rxb7 cxb7 Qd6 Bxa7
                         Qd1+ Kg2
  10/23   5.80     --    ... Rxe7
  10/25   6.81  -3.27    ... Rxe7 Rxe7+ Rf7 Rxb7 Rxb7 Qxb7+ Kg6 Qxa7 Qf5 Qb6+
                         Bf6 c6 Qf3
  10/25  11.30   x.xx    ... Qg6
  10/25  13.08  -3.03    ... Qg6 Qxg6+ Kxg6 Rxb7 Rxe7 Rxe7 Rb8 c6 Bf6 Rb7
                         Rxb7 cxb7 Be5 Bxa7
  10-->  15.67  -3.03    ... Qg6 Qxg6+ Kxg6 Rxb7 Rxe7 Rxe7 Rb8 c6 Bf6 Rb7
                         Rxb7 cxb7 Be5 Bxa7
  11/27  18.79  -3.18    ... Qg6 Qxg6+ Kxg6 Rxb7 Rxe7 Rxe7 a5 bxa6 Bf6 Rb7
                         Ra8 a7 Kf5 c6
  11/27  19.37   x.xx    ... Rxe7
  11/27  21.43  -3.10    ... Rxe7 Rxe7+ Rf7 Rxb7 Be5 Rxf7+ Kxf7 Qh7+ Kf8 Qxa7
                         Qd8 Qa4 Qb8 h3 Qc7
  11-->  28.33  -3.10    ... Rxe7 Rxe7+ Rf7 Rxb7 Be5 Rxf7+ Kxf7 Qh7+ Kf8 Qxa7
                         Qd8 Qa4 Qb8 h3 Qc7
  12/29  33.51  -3.11    ... Rxe7 Rxe7+ Rf7 Rxb7 Rxb7 Qxb7+ Kg6 Qxa7 Qf5 Qa6+
                         Bf6 Qa4 Qb1+ Kg2 Qe1 Qe4+ Kh5
  12-->  52.34  -3.11    ... Rxe7 Rxe7+ Rf7 Rxb7 Rxb7 Qxb7+ Kg6 Qxa7 Qf5 Qa6+
                         Bf6 Qa4 Qb1+ Kg2 Qe1 Qe4+ Kh5
  13/32   1:00     --    ... Rxe7
  13/32   1:02  -3.42    ... Rxe7 Rxe7+ Rf7 Rxb7 Rxb7 Qxb7+ Kg6 Qxa7 Qf3 Qd7
                         Qe4
  13-->   2:10  -3.42    ... Rxe7 Rxe7+ Rf7 Rxb7 Rxb7 Qxb7+ Kg6 Qxa7 Qf3 Qd7
                         Qe4
  14/34   2:31  -3.52    ... Rxe7 Rxe7+ Rf7 Rxb7 Rxb7 Qxb7+ Kg6 Qxa7 Qf5 Qa4
                         Qb1+ Kg2 Qd3 c6 Be5 b6 Qe2
  14-->   4:09  -3.52    ... Rxe7 Rxe7+ Rf7 Rxb7 Rxb7 Qxb7+ Kg6 Qxa7 Qf5 Qa4
                         Qb1+ Kg2 Qd3 c6 Be5 b6 Qe2
  15/35   5:09     --    ... Rxe7
  15/35   6:03  -3.94    ... Rxe7 Rxe7+ Rf7 Rxb7 Be5 c6 Qd6 Rxf7+ Kxf7 h3
                         Ke6 Bxa7 Qd1+ Kg2 Qd5 Qxd5+ Kxd5 Bb6 Ke6 Kf3
  15/36   7:39   x.xx    ... Qg6
  15-->  13:16  -3.94    ... Rxe7 Rxe7+ Rf7 Rxb7 Be5 c6 Qd6 Rxf7+ Kxf7 h3
                         Ke6 Bxa7 Qd1+ Kg2 Qd5 Qxd5+ Kxd5 Bb6 Ke6 Kf3
  16/39  15:39  -3.94    ... Rxe7 Rxe7+ Rf7 Rxb7 Be5 c6 Qd6 Rxf7+ Kxf7 h3
                         Ke6 Bxa7 Qd1+ Kg2 Qd5 Qxd5+ Kxd5 Kf3 Bf4 Bb6 Ke6
  16...  16:28   3/35    a6

Time: 16:39, cpu 94.39%, nodes 583628521, nps 584201
Hash: 128M, used 100%, hits 25%
EGTB: probs 23, hits 23

Best move: Rxe7 (-3.94)  Solved (1/1)

Time: 16:39, Average: 21.53, Nodes: 583628521, nps: 583600
Summery: 1/1



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