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Subject: Re: Forced Mate...?

Author: Stuart Cracraft

Date: 15:58:39 12/22/05

Go up one level in this thread


On December 22, 2005 at 18:11:59, Rob Basham wrote:

>[D]2qr3r/p4kbN/1p1n1pp1/2pP3n/2P1P3/1P1BB1R1/P4K1R/7Q w - - 0 1
>
>1.Rxh5....and white mates in about 11 or 14 moves...
>
>Maybe a forced mate..not sure!
>
>Rob

It's interesting. No I could not find proof. The evaluation keeps going up.
Ran on Pentium M in selective and full-width modes for 999 seconds each
try.

Selective search (999 second limit)

Itr/Max Mv   Time   Score Nodes PV
 1/ 1> g3g6 446  0.00        2 g3g6
 1/ 2  g3g6 1056  0.00       50 g3g6
 2/ 6< g3g6 655  0.00      340 g3g6 h8h7
 2/ 6  g3g1 -1911  0.00     1030 g3g1 h8h7 g1g6
 3/ 6> g3g1 -1510  0.02     1669 g3g1 h8h7 g1g6
 3/ 6  g3g6 -932  0.03     4056 g3g6 f7g6 h2h5
 4/10> g3g6 -531  0.05     8124 g3g6 f7g6 e4e5 f6f5 h2h5
 4/10  h2h5 67  0.08    15702 h2h5 d6e4 h1e4 g6h5
 5/13> h2h5 467  0.14    25072 h2h5 d6e4 h1e4 g6h5 f2g1 f7g8
 5/13  h2h5 986  0.21    40844 h2h5 d6e4 h1e4 g6h5 f2g1 f7g8
 6/15> h2h5 1386  0.56    99764 h2h5 d6e4 d3e4 h8h7 h5h7 d8d5
 6/18  h2h5 2041  1.13   197588 h2h5 c8a6 h1g1 a6a2 f2e1 a2b3 g3g6
 7/20  h2h5 1996  2.11   364600 h2h5 c8a6 h1a1 d8e8 h5h1 d6e4 d3e4 e8e4
 8/22> h2h5 2396  4.77   794757 h2h5 c8a6 h1d1 h8e8 h5h4 g6g5 h4g4 a6a2
 8/22  h2h5 2397  5.97  1004301 h2h5 c8a6 e4e5 a6a2 f2g1 d6f5 d3f5
 9/22> h2h5 2797  8.59  1421966 h2h5 c8a6 e4e5 a6a2 f2g1 d6f5 d3f5
 9/25  h2h5 3134 20.21  3160949 h2h5 d8e8 h1g2 h8g8 g3g6 g7h8 h7f8 d6e4 f2g1
g8f8 d3e4
10/25> h2h5 3534 40.41  5990998 h2h5 d8e8 h1g2 h8g8 h7f6 d6e4 d3e4 g6h5 f6g8
10/25  h2h5 3534 42.30  6314066 h2h5 d8e8 f2g1 h8g8 g3g6 g7h8 h7g5
11/25> h2h5 3934 68.86 10117026 h2h5 d8e8 f2g1 h8g8 g3g6 g7h8 h7g5 f6g5 g6d6
11/30  h2h5 4081 131.70 19380055 h2h5 h8g8 h1f3 g6h5 f3h5
12/30  h2h5 4480 206.62 30581341 h2h5 h8g8 h1f3 c8a6 d3b1 g7h8 h7f6
13/30> h2h5 4880 305.14 45159813 h2h5 h8g8 h1f3 c8a6 d3b1 g7h8 h7f6 h8f6
13/30  h2h5 5155 640.80 97509129 h2h5 d8g8 e4e5 f6f5 e5d6 g7e5 g3g6 f7g6 d3f5
c8f5 h5f5 e5d6 h1f3 g6
h7 f3e4
14/33 Th1f3  999.00 4755 155735063 h2h5 d8g8 e4e5 d6e4 d3e4 f6f5 h1f3 g6h5
nps=155890 ha=0.00% q=-4.0% bc=47% br=2.31% mp=0<>1080745984
pawnx=103933 recapx=1354317 qcheckx=0 checkx=10095448 qfutilx=70882642
onereplyx=391796 mthrx=732 fu
tilx=0 bmx=1318770
h2h5 d8g8 e4e5 d6e4 d3e4 f6f5 h1f3 g6h5
- 14.00/33.00 0% 0/1 ha=0 999.00 155735056 155735056/999/155890
103933/1354317/732/10095448/70882640
/391796/0/1318770
pawnx/recapx/mthrx/checkx/qfutilx/onereplyx/futilx/bmx
--------------------------------
Missed:
1
branching factor = 2.31
maxtime = 99900


Full-width search (999 second limit):

Alpha=-354 Beta=446 Maxdepth=9999999 MaxTime=99900
Ply/Max Mv   Time   Score Nodes PV
 1/ 1>g3g6 446  0.00        2 g3g6
 1/ 2 g3g6 1056  0.00       50 g3g6
 2/ 6<g3g6 655  0.00      340 g3g6 h8h7
 2/ 6 g3g1 -1911  0.02     1037 g3g1 h8h7 g1g6
 3/ 6>g3g1 -1510  0.03     1676 g3g1 h8h7 g1g6
 3/ 6 g3g6 -932  0.03     4086 g3g6 f7g6 h2h5
 4/10>g3g6 -531  0.06     8402 g3g6 f7g6 e4e5 f6f5 h2h5
 4/15 h2h5 97  0.10    17838 h2h5 g6h5 h1h5 f7g8 h7f6 g8f8
 5/18 h2h5 118  0.21    43010 h2h5 g6h5 h1h5 f7g8 h7f6 g8f8 f6h7 f8g8 e3c5
 6/18>h2h5 518  0.34    69734 h2h5 g6h5 h1h5 f7g8 h7f6 g8f8 h5g5 g7f6 g5f6 f8e8
 6/18 h2h5 519  0.58   122653 h2h5 g6h5 h1h5 f7g8 g3g7 g8g7 h5h6 g7f7 h6f6 f7e8
f6h8
 7/18>h2h5 919  0.84   180547 h2h5 g6h5 h1h5 f7g8 g3g7 g8g7 h5h6 g7f7 h6f6 f7e8
f6h8
 7/25 h2h5 2105  6.17  1309113 h2h5 c8a6 a2a4 d6f5 g3g6 f7g6 e4f5 g6f7 f2g1
 8/25>h2h5 2505  8.36  1762545 h2h5 c8a6 a2a4 d6f5 g3g6 f5e3 g6g7 f7g7
 8/29 h2h5 3004 16.30  3444027 h2h5 c8a6 e4e5 a6a2 f2f3 f6e5 d3g6
 9/30 h2h5 3114 60.02 12735350 h2h5 d8e8 e4e5 e8e5 d3g6 f7e7 h5e5 f6e5 h1h4 e7d7
g6c2 h8g8 h7f6 g7f6
 h4f6 g8g3 f2g3
10/31>h2h5 3514 144.14 29719062 h2h5 d8e8 e3f4 c8a6 f4d6 e8d8
10/35 h2h5 3992 287.20 56731021 h2h5 c8a6 e4e5 a6a2 f2f3 f6e5 d3g6 f7e7 e3g5
e7d7 h1h3 d7c7 g5d8 h8d
8 h7g5
11/41 Th2h5  999.00 3997 186173467 h2h5 c8a6 h1h3 a6a2 f2f3 h8e8 e4e5 f6f5 h7g5
f7e7 h5h7 e8g8 e5d6
d8d6
nps=186359 ha=0.00% q=-5.0% bc=57% br=3.64% mp=0<>1080532992
pawnx=142496 recapx=319795 qcheckx=0 checkx=9917790 qfutilx=97140559
onereplyx=943751 mthrx=35 futil
x=0 bmx=4205400
h2h5 c8a6 h1h3 a6a2 f2f3 h8e8 e4e5 f6f5 h7g5 f7e7 h5h7 e8g8 e5d6 d8d6 -
11.00/41.00 0% 0/1 ha=0 999.
00 186173472 186173472/999/186359
142496/319795/35/9917790/97140560/943751/0/4205400
pawnx/recapx/mthrx/checkx/qfutilx/onereplyx/futilx/bmx
--------------------------------
Missed:
1
branching factor = 3.64



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