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Subject: Re: Doesn't appear to work for me (results and positions long)

Author: Omid David Tabibi

Date: 03:26:44 11/22/02

Go up one level in this thread


On November 22, 2002 at 06:16:37, Uri Blass wrote:

>On November 21, 2002 at 19:57:54, Uri Blass wrote:
>
>>On November 21, 2002 at 16:46:28, Omid David Tabibi wrote:
>>
>>>On November 21, 2002 at 15:55:55, Uri Blass wrote:
>>>
>>>>On November 21, 2002 at 09:10:32, Omid David Tabibi wrote:
>>>>
>>>>>On November 21, 2002 at 07:18:11, Uri Blass wrote:
>>>>>
>>>>>>On November 21, 2002 at 06:26:16, Uri Blass wrote:
>>>>>>
>>>>>>>On November 21, 2002 at 06:25:17, Uri Blass wrote:
>>>>>>>
>>>>>>>>On November 21, 2002 at 04:52:13, Omid David Tabibi wrote:
>>>>>>>>
>>>>>>>>>On November 20, 2002 at 22:05:29, Robert Hyatt wrote:
>>>>>>>>>
>>>>>>>>>>On November 20, 2002 at 16:55:41, Gian-Carlo Pascutto wrote:
>>>>>>>>>>
>>>>>>>>>>>Nullmove in Deep Sjeng uses an algorithm of my own, but I can
>>>>>>>>>>>switch it back to other systems easily. I did so for running
>>>>>>>>>>>a few tests.
>>>>>>>>>>>
>>>>>>>>>>>I made a version which uses Heinz Adaptive Nullmove Pruning
>>>>>>>>>>>and a version which uses your verification nullmove.
>>>>>>>>>>
>>>>>>>>>>This would seem to be a bit harder than at first glance.  They say that
>>>>>>>>>>if the normal null-move search fails high, then do a D-1 regular search
>>>>>>>>>>to verify that, but while in that verification search, no further
>>>>>>>>>>verification searches are done, meaning that the normal null-move search
>>>>>>>>>>fail-high is treated just like we do it today..
>>>>>>>>>>
>>>>>>>>>>I'm going to experiment with this myself, just for fun, but it seems that you
>>>>>>>>>>need to pass some sort of flag down thru the search calls indicating that
>>>>>>>>>>you are either below a verification-search node or not so that recursive
>>>>>>>>>>verification searches are not done...
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>>Exactly!! (finally someone read the article carefully)
>>>>>>>>>
>>>>>>>>>See Figure 3 for detailed implementation (the flag you mentioned which is passed
>>>>>>>>>down as a parameter for search(), is called 'verify' in the pseudo-code).
>>>>>>>>>
>>>>>>>>>At first stage leave alone the zugzwang detection part (the piece of code at the
>>>>>>>>>bottom of Figure 3). Due to instablilities, some programs might do a needless
>>>>>>>>>re-search. First let the algorithm work fine in general, and then do the
>>>>>>>>>zugwzang detection part.
>>>>>>>>
>>>>>>>>I let the algorithm to work without zugwzang detection and first results seems
>>>>>>>>not to be good
>>>>>>>>
>>>>>>>>Some positions I get at the same depth and
>>>>>>>>the only position so far in the gcp test suite that I got at smaller depth for
>>>>>>>>tactical reasons is
>>>>>>>>[D]5rk1/1r1qbnnp/R2p2p1/1p1Pp3/1Pp1P1N1/2P1B1NP/5QP1/5R1K w - - 0 1
>>>>>>>>
>>>>>>>>I am going to try it in 10 sedconds per move and get resulkts in half an hour.
>>>>>>>>
>>>>>>>>Uri
>>>>>>>
>>>>>>>should be seconds,results,position
>>>>>>>I type too fast.
>>>>>>>
>>>>>>>Uri
>>>>>>
>>>>>>Here are the results of the new version:
>>>>>>
>>>>>>1     39     39
>>>>>>2      9     48
>>>>>>3      8     56
>>>>>>4     11     67
>>>>>>5      6     73
>>>>>>6      6     79
>>>>>>7      5     84
>>>>>>8      4     88
>>>>>>9      4     92
>>>>>>10      2     94
>>>>>>
>>>>>>results of the old version seem better:
>>>>>>
>>>>>>1     40     40
>>>>>>2     17     57
>>>>>>3      8     65
>>>>>>4      7     72
>>>>>>5      6     78
>>>>>>6      4     82
>>>>>>7      8     90
>>>>>>8      2     92
>>>>>>9      3     95
>>>>>>10      1     96
>>>>>>
>>>>>>Remember also that I tested the olf version at more than 10 seconds per move so
>>>>>>if it changed it's mind after 20 seconds from the right move to the wrong move
>>>>>>the position is counted as a failure.
>>>>>>
>>>>>>Uri
>>>>>
>>>>>Did you use the exact implementation I described in Figure 3?
>>>>>
>>>>>BTW, you have to compare the algorithms at deeper searches. A fixed 10 ply depth
>>>>>will be fine.
>>>>
>>>>Some notes:
>>>>
>>>>I do not the exact implementation in figure 3.
>>>>Differences:
>>>>
>>>>1)I do not use null move pruning at depth=1 because I have other pruning and I
>>>>did not change it.
>>>>null move pruning is used by movei only when the depth is at least 2.
>>>>
>>>>2)I did use research so I have not varaible to tell me about fail high and after
>>>>fail high, I trust the result of normal search(verify=false) with depth
>>>>that is reduced by 1.
>>>>
>>>>3)I already tested it at 300 seconds per move(still without research) and I
>>>>expect to have results tommorow.
>>>>
>>>>I am going to compare it with results of my previous version(null move pruning
>>>>R=3)
>>>>I use also other pruning ideas that I did not change.
>>>>
>>>>Uri
>>>
>>>I'm afraid that all these differences might result in a totally different
>>>structure. I strongly recommend you to try my exact implemenation first.
>>
>>I am interested in the question if verification search can help movei to be
>>better so I compare time to get the solution and try first minimal changes.
>>
>>1)If the target is to have something that is clearly superior to R=2 then I
>>believe that I already have it and not only because of R=3.
>>
>>It means that I do not expect to do movei significantly better by removing
>>pruning.
>>
>>2)I am going to try later the following changes:
>>
>>a)Replace depth>1 by (!verify||depth>1)
>>b)Maybe some changes of my pruning rules to try to make a) productive
>>c)Add research
>>
>>Uri
>
>I promised to post today results and it seems that the difference at long time
>control is small and there are some positions when verification search without
>research solves faster
>
>Total results and some positions:
>
>
>Results with verification search(no research):
>
> Sec Solved Total
>---- ------ ------
>   1     37     37
>   2      9     46
>   3      8     54
>   4      9     63
>   5      6     69
>   6      7     76
>   7      5     81
>   8      3     84
>   9      4     88
>  10      2     90
>  11      1     91
>  12      2     93
>  13      4     97
>  14      2     99
>  15      0     99
>  16      2    101
>  17      0    101
>  18      0    101
>  19      0    101
>  20      0    101
>  21      1    102
>  22      3    105
>  23      2    107
>  24      1    108
>  25      1    109
>  26      1    110
>  27      1    111
>  28      0    111
>  29      2    113
>  30      0    113
>  31      1    114
>  32      1    115
>  33      2    117
>  34      0    117
>  35      1    118
>  36      0    118
>  37      0    118
>  38      0    118
>  39      0    118
>  40      0    118
>  41      1    119
>  42      0    119
>  43      0    119
>  44      0    119
>  45      0    119
>  46      0    119
>  47      1    120
>  48      0    120
>  49      0    120
>  50      2    122
>  51      0    122
>  52      0    122
>  53      0    122
>  54      0    122
>  55      1    123
>  56      0    123
>  57      0    123
>  58      1    124
>  59      0    124
>  60      0    124
>  61      0    124
>  62      0    124
>  63      3    127
>  64      1    128
>  65      0    128
>  66      1    129
>  67      0    129
>  68      0    129
>  69      0    129
>  70      0    129
>  71      1    130
>  72      0    130
>  73      0    130
>  74      0    130
>  75      1    131
>  76      0    131
>  77      0    131
>  78      0    131
>  79      0    131
>  80      1    132
>  81      0    132
>  82      0    132
>  83      0    132
>  84      0    132
>  85      0    132
>  86      0    132
>  87      0    132
>  88      0    132
>  89      0    132
>  90      0    132
>  91      0    132
>  92      1    133
>  93      0    133
>  94      1    134
>  95      0    134
>  96      0    134
>  97      0    134
>  98      0    134
>  99      0    134
> 100      0    134
> 101      0    134
> 102      0    134
> 103      0    134
> 104      0    134
> 105      0    134
> 106      0    134
> 107      0    134
> 108      0    134
> 109      0    134
> 110      0    134
> 111      0    134
> 112      0    134
> 113      0    134
> 114      0    134
> 115      0    134
> 116      0    134
> 117      0    134
> 118      0    134
> 119      0    134
> 120      0    134
> 121      0    134
> 122      0    134
> 123      1    135
> 124      1    136
> 125      0    136
> 126      0    136
> 127      0    136
> 128      1    137
> 129      0    137
> 130      0    137
> 131      0    137
> 132      0    137
> 133      0    137
> 134      0    137
> 135      0    137
> 136      0    137
> 137      0    137
> 138      0    137
> 139      0    137
> 140      0    137
> 141      0    137
> 142      1    138
> 143      0    138
> 144      0    138
> 145      0    138
> 146      0    138
> 147      0    138
> 148      0    138
> 149      0    138
> 150      1    139
> 151      0    139
> 152      0    139
> 153      0    139
> 154      0    139
> 155      1    140
> 156      0    140
> 157      0    140
> 158      0    140
> 159      0    140
> 160      0    140
> 161      0    140
> 162      0    140
> 163      0    140
> 164      0    140
> 165      1    141
> 166      0    141
> 167      0    141
> 168      0    141
> 169      0    141
> 170      1    142
> 171      0    142
> 172      0    142
> 173      0    142
> 174      1    143
> 175      0    143
> 176      0    143
> 177      0    143
> 178      0    143
> 179      0    143
> 180      0    143
> 181      0    143
> 182      0    143
> 183      0    143
> 184      0    143
> 185      0    143
> 186      1    144
> 187      0    144
> 188      0    144
> 189      0    144
> 190      0    144
> 191      0    144
> 192      0    144
> 193      0    144
> 194      0    144
> 195      0    144
> 196      0    144
> 197      0    144
> 198      0    144
> 199      0    144
> 200      0    144
> 201      0    144
> 202      1    145
> 203      0    145
> 204      1    146
> 205      0    146
> 206      0    146
> 207      0    146
> 208      0    146
> 209      0    146
> 210      0    146
> 211      0    146
> 212      0    146
> 213      0    146
> 214      0    146
> 215      0    146
> 216      0    146
> 217      0    146
> 218      0    146
> 219      0    146
> 220      0    146
> 221      0    146
> 222      0    146
> 223      0    146
> 224      0    146
> 225      0    146
> 226      0    146
> 227      0    146
> 228      0    146
> 229      0    146
> 230      0    146
> 231      0    146
> 232      0    146
> 233      0    146
> 234      0    146
> 235      0    146
> 236      0    146
> 237      0    146
> 238      0    146
> 239      0    146
> 240      0    146
> 241      0    146
> 242      0    146
> 243      0    146
> 244      0    146
> 245      0    146
> 246      1    147
> 247      0    147
> 248      0    147
> 249      0    147
> 250      0    147
> 251      0    147
> 252      1    148
> 253      0    148
> 254      0    148
> 255      0    148
> 256      0    148
> 257      0    148
> 258      0    148
> 259      0    148
> 260      0    148
> 261      0    148
> 262      0    148
> 263      0    148
> 264      0    148
> 265      0    148
> 266      0    148
> 267      0    148
> 268      0    148
> 269      0    148
> 270      0    148
> 271      0    148
> 272      0    148
> 273      0    148
> 274      0    148
> 275      0    148
> 276      0    148
> 277      0    148
> 278      1    149
>
>149 problems solved.
>34 problems unsolved.
>
>Without verification search
>
>   1     40     40
>   2     17     57
>   3      8     65
>   4      7     72
>   5      6     78
>   6      4     82
>   7      8     90
>   8      2     92
>   9      3     95
>  10      1     96
>  11      3     99
>  12      3    102
>  13      1    103
>  14      1    104
>  15      2    106
>  16      2    108
>  17      1    109
>  18      2    111
>  19      2    113
>  20      0    113
>  21      1    114
>  22      2    116
>  23      0    116
>  24      0    116
>  25      1    117
>  26      1    118
>  27      0    118
>  28      1    119
>  29      1    120
>  30      0    120
>  31      0    120
>  32      1    121
>  33      0    121
>  34      1    122
>  35      0    122
>  36      0    122
>  37      0    122
>  38      1    123
>  39      0    123
>  40      0    123
>  41      0    123
>  42      0    123
>  43      0    123
>  44      0    123
>  45      0    123
>  46      1    124
>  47      1    125
>  48      1    126
>  49      0    126
>  50      0    126
>  51      0    126
>  52      0    126
>  53      0    126
>  54      0    126
>  55      0    126
>  56      1    127
>  57      0    127
>  58      0    127
>  59      0    127
>  60      0    127
>  61      0    127
>  62      0    127
>  63      0    127
>  64      0    127
>  65      0    127
>  66      0    127
>  67      0    127
>  68      1    128
>  69      0    128
>  70      0    128
>  71      1    129
>  72      2    131
>  73      0    131
>  74      0    131
>  75      2    133
>  76      0    133
>  77      0    133
>  78      0    133
>  79      0    133
>  80      0    133
>  81      0    133
>  82      1    134
>  83      0    134
>  84      0    134
>  85      0    134
>  86      0    134
>  87      0    134
>  88      0    134
>  89      0    134
>  90      0    134
>  91      1    135
>  92      0    135
>  93      0    135
>  94      0    135
>  95      0    135
>  96      0    135
>  97      0    135
>  98      0    135
>  99      0    135
> 100      0    135
> 101      0    135
> 102      0    135
> 103      0    135
> 104      0    135
> 105      0    135
> 106      0    135
> 107      0    135
> 108      0    135
> 109      0    135
> 110      0    135
> 111      0    135
> 112      0    135
> 113      0    135
> 114      0    135
> 115      0    135
> 116      0    135
> 117      0    135
> 118      0    135
> 119      0    135
> 120      0    135
> 121      0    135
> 122      1    136
> 123      0    136
> 124      2    138
> 125      0    138
> 126      0    138
> 127      0    138
> 128      0    138
> 129      0    138
> 130      0    138
> 131      0    138
> 132      0    138
> 133      0    138
> 134      0    138
> 135      0    138
> 136      1    139
> 137      0    139
> 138      1    140
> 139      0    140
> 140      0    140
> 141      0    140
> 142      0    140
> 143      0    140
> 144      0    140
> 145      0    140
> 146      0    140
> 147      0    140
> 148      0    140
> 149      0    140
> 150      0    140
> 151      1    141
> 152      0    141
> 153      0    141
> 154      0    141
> 155      0    141
> 156      0    141
> 157      0    141
> 158      0    141
> 159      0    141
> 160      0    141
> 161      0    141
> 162      0    141
> 163      0    141
> 164      0    141
> 165      0    141
> 166      0    141
> 167      0    141
> 168      0    141
> 169      1    142
> 170      1    143
> 171      0    143
> 172      0    143
> 173      0    143
> 174      0    143
> 175      0    143
> 176      0    143
> 177      0    143
> 178      0    143
> 179      0    143
> 180      0    143
> 181      1    144
> 182      0    144
> 183      0    144
> 184      0    144
> 185      0    144
> 186      0    144
> 187      1    145
> 188      0    145
> 189      0    145
> 190      0    145
> 191      0    145
> 192      0    145
> 193      0    145
> 194      0    145
> 195      0    145
> 196      0    145
> 197      0    145
> 198      0    145
> 199      0    145
> 200      0    145
> 201      0    145
> 202      0    145
> 203      0    145
> 204      0    145
> 205      0    145
> 206      0    145
> 207      0    145
> 208      0    145
> 209      0    145
> 210      0    145
> 211      0    145
> 212      0    145
> 213      0    145
> 214      1    146
> 215      0    146
> 216      0    146
> 217      0    146
> 218      0    146
> 219      0    146
> 220      0    146
> 221      0    146
> 222      0    146
> 223      0    146
> 224      0    146
> 225      0    146
> 226      0    146
> 227      0    146
> 228      0    146
> 229      0    146
> 230      0    146
> 231      0    146
> 232      0    146
> 233      0    146
> 234      0    146
> 235      0    146
> 236      0    146
> 237      0    146
> 238      1    147
> 239      0    147
> 240      1    148
> 241      0    148
> 242      0    148
> 243      1    149
> 244      0    149
> 245      0    149
> 246      0    149
> 247      0    149
> 248      0    149
> 249      0    149
> 250      0    149
> 251      0    149
> 252      0    149
> 253      0    149
> 254      0    149
> 255      0    149
> 256      0    149
> 257      0    149
> 258      0    149
> 259      0    149
> 260      0    149
> 261      0    149
> 262      0    149
> 263      0    149
> 264      0    149
> 265      0    149
> 266      0    149
> 267      0    149
> 268      1    150
> 269      0    150
> 270      0    150
> 271      0    150
> 272      0    150
> 273      0    150
> 274      0    150
> 275      0    150
> 276      0    150
> 277      0    150
> 278      0    150
> 279      1    151
>
>Some positions and analysis at depth>=10:
>
>Id:  ECM.1080
>[D]b3r3/q2B2k1/3Q2p1/1p5p/3pP3/5P2/1p4PP/5RK1 b - - 0 1
>Bm:  d3+
>
>no   10    148860    +48     24297294 e8g8 d7e6 g8f8 f1b1 f8f6 d6d7 a7d7 e6d7
>                                      a8c6 d7c6 f6c6 b1b2
>yes  10    169680    +49     27935805 d4d3
>yes  10    191190   +133     31488237 d4d3 g1h1 a7f2 d6d3 a8e4 f3e4 f2f1 d3f1
>                                      e8a8 d7g4 a8a1 g4d1 b2b1q
>yes  10    205320   +133     34125942 d4d3 g1h1 a7f2 d6d3 a8e4 f3e4 f2f1 d3f1
>                                      e8a8 d7g4 a8a1 g4d1 b2b1q
>yes  11    251670   +227     41842250 d4d3 g1h1 a7f2 f1d1 f2c2 d6d4 g7g8 d4g1
>                                      e8e5 d1b1 h5h4 g1d1 a8b7
>yes  11    293100   +227     49861568 d4d3 g1h1 a7f2 f1d1 f2c2 d6d4 g7g8 d4g1
>                                      e8e5 d1b1 h5h4 g1d1 a8b7
>
>Result:   Success
>Found in: 169680 ms (00:02:49.680)
>
>Without verification search
>
>Id:  ECM.1080
>Fen: b3r3/q2B2k1/3Q2p1/1p5p/3pP3/5P2/1p4PP/5RK1 b - - 0 1
>Bm:  d3+
>
>no   10     71230    +50     11483702 e8f8 d7b5 f8b8 b5d3 b8b3 d3b1 g7f7 g1h1
>                                      b3c3 e4e5 331 494576
>no   10     95520    +50     15678430 e8f8 d7b5 f8b8 b5d3 b8b3 d3b1 g7f7 g1h1
>                                      b3c3 e4e5 420 708299
>no   11    289030    +68     47066642 e8f8 h2h4 b5b4 d7b5 b4b3 b5c4 f8b8 d6e6
>                                      a7b6 e6e7 g7h8 e7e5 h8h7 e5e7 h7h6 1181
>                                      1842263
>
>Result:   Failure
>
>Movei needed depth 11 and slightly more than 5 minutes to find d3
>without verifications.
>
>Another example
>Id:  ECM.1295
>[D]r3r1k1/4pp1p/b5pB/q1pP4/3b4/2N4P/PP4P1/R2RQ2K w - - 0 1
>Bm:  Rxd4
>
>no   10     20660     -3      3312889 h6e3 e7e5 c3e4 a5e1 d1e1 e8b8 e3d4 c5d4
>                                      e4f6 g8g7 f6d7 b8b2 d7e5
>no   10     53400     -3      8501736 h6e3 e7e5 c3e4 a5e1 d1e1 e8b8 e3d4 c5d4
>                                      e4f6 g8g7 f6d7 b8b2 d7e5
>no   11     94520    -17     15056680 h6e3 e7e5 c3e4 a5e1 d1e1 e8b8 e3d4 c5d4
>                                      b2b3 a6b7 e4f6 g8g7 f6d7 b8d8 d7b6
>yes  11    277690    -16     43921712 d1d4
>
>Result:   Success
>Found in: 277690 ms (00:04:37.690)
>
>Movei needs almost 5 minutes to solve the fail high now(it seems that in the
>test it ran slightly slower so it did not got it and it can finish depth 11 few
>seconds later
>
>depth=11 +0.13 d1d4 c5d4 e1e5 f7f6 e5e6 g8h8 a1e1 a6e2 e6f7 e8g8 f7e7 a8a6 e7e2
>d4c3 b2c3 a5c3
>Nodes: 48414119 NPS: 159914
>Time: 00:05:02.75
>
>without verification search movei can get depth 12 but see nothing
>
>Id:  ECM.1295
>Fen: r3r1k1/4pp1p/b5pB/q1pP4/3b4/2N4P/PP4P1/R2RQ2K w - - 0 1
>Bm:  Rxd4
>
>no   10     13730     +2      2116792 h6e3 e7e5 c3e4 a5e1 d1e1 e8b8 e3d4 c5d4
>                                      b2b3 b8b6 d5d6 a6b7 e4f6 g8h8 164 216173
>no   10     23150     +2      3600940 h6e3 e7e5 c3e4 a5e1 d1e1 e8b8 e3d4 c5d4
>                                      b2b3 b8b6 d5d6 a6b7 e4f6 g8h8 275 354437
>no   11     55030    -19      8532899 h6e3 e7e5 c3e4 a5e1 d1e1 e8b8 e3d4 c5d4
>                                      b2b3 b8d8 h1g1 a6b7 e4f6 g8g7 f6g4 b7d5
>                                      g4e5 666 714624
>no   11    200200    -19     30666318 h6e3 e7e5 c3e4 a5e1 d1e1 e8b8 e3d4 c5d4
>                                      b2b3 b8d8 h1g1 a6b7 e4f6 g8g7 f6g4 b7d5
>                                      g4e5 2250 2485690
>no   12    273040    -26     41961239 h6e3 e7e5 c3e4 a5e1 d1e1 e8b8 e3d4 c5d4
>                                      b2b3 b8d8 e4f6 g8g7 f6g4 a6b7 h1g1 b7d5
>                                      g4e5 3007 3298307
>
>
>Here is comparison of another position and if the solution is correct movei
>without verifying detection solves it for the wrong reason
>
>
>Movei with no verification
>Id:  ECM.1304
>[D]2rbr2k/1pq2ppp/p3bn2/4p1B1/P3P3/2N3Q1/1PP1B1PP/3R1R1K w - - 0 1
>Bm:  Rxd8
>
>
>no   10     54620     +2      7938770 g3e3 f6g4 e2g4 e6g4 d1d8 e8d8 g5d8 c8d8
>                                      e3g5 g4e6 g2g4
>no   10    112520     +2     16728627 g3e3 f6g4 e2g4 e6g4 d1d8 e8d8 g5d8 c8d8
>                                      e3g5 g4e6 g2g4
>no   11    141190     -6     21063683 g3e3 f6g4 e2g4 e6g4 g5d8 e8d8 d1d8 c8d8
>                                      c3d5 c7c4 f1f7 c4c2 f7b7 c2a4
>
>Result:   Failure
>
>without verification:
>
>2rbr2k/1pq2ppp/p3bn2/4p1B1/P3P3/2N3Q1/1PP1B1PP/3R1R1K w - - 0 1
>Bm:  Rxd8
>
>no   10     47380     +2      6646151 g3e3 f6g4 e2g4 e6g4 d1d8 e8d8 g5d8 c8d8
>                                      e3g5 g4e6 g2g4 340 861950
>no   10     96790     +3     13756903 g3h4
>no   10    108240     +2     15433644 g3e3 f6g4 e2g4 e6g4 d1d8 e8d8 g5d8 c8d8
>                                      e3g5 g4e6 g2g4 728 2160916
>no   11    113490     -6     16225840 g3e3 f6g4 e2g4 e6g4 g5d8 e8d8 d1d8 c8d8
>                                      c3d5 c7c4 f1f7 c4c2 f7b7 c2a4 813 2268570
>no   11    146850     -5     21240829 h2h3
>no   11    157960     +0     22863612 h2h3 c7b6 d1d8 b6d8 g3h4 d8b6 g5f6 g7f6
>                                      h4f6 h8g8 f6g5 g8f8 g5h6 f8g8 h6g5 1407
>                                      3172121
>yes  11    237800     +1     34792125 d1d8
>yes  11    241930    +10     35431668 d1d8 c7d8 g3h4 e8g8 f1f6 d8b6 f6e6 f7e6
>                                      g5c1 g8f8 h4g5 b6f2 2181 4906295
>yes  11    269290    +10     39396996 d1d8 c7d8 g3h4 e8g8 f1f6 d8b6 f6e6 f7e6
>                                      g5c1 g8f8 h4g5 b6f2 2299 5510667
>yes  12    277430     -2     40659065 d1d8 c7d8 g3h4 h8g8 f1f6 d8b6 h4g3 b6b2
>                                      g5h6 g7g6 c3d5 c8c2 2360 5662183
>
>Result:   Success
>Found in: 237800 ms (00:03:57.800)
>
>When I continue the analysis without verification search I get and  movei
>changes it's mind at depth 13.
>
>12 -2 88661 127124253 d1d8 c7d8 g3h4 h8g8 f1f6 d8b6 h4g3 b6b2 g5h6 g7g6 c3d5
>c8c2
>13 -16 91412 131430103 d1d8 c7d8 g3h4 h8g8 f1f6 d8b6 h4g3 b6b2 c3d5 e6d5 e4d5
>c8c3 g3g4 c3c2
>13 -15 125647 180460345 h2h3
>13 0 204584 295468093 h2h3 d8e7 g3h4 c8d8 d1d8 e8d8 g5f6 e7f6 f1f6 g7f6 h4f6
>h8g8 f6g5 g8h8 g5f6
>
>Uri

Oh, now we are getting closer. The more you play with the idea to fit it into
your program's framework, the better will be the results. Please keep me posted
with your results.

Omid.





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