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Subject: Re: Test position compromising the king's safety

Author: Tord Romstad

Date: 08:54:22 10/30/03

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On October 29, 2003 at 18:01:28, Jaime Benito de Valle Ruiz wrote:

>This is just a variation on another position posted not long ago, and on a
>typical position where the king's safety is at stake:
>
>[d]r1bq1rk1/1p2bppp/p3p3/1n2P3/4N3/1P1P1N2/PB4PP/R3QR1K w - - 0 1
>
>In the previous position, the 1.Nf6 move seems good even if the engine is not
>aware of its potential, but in this one the engine must understand the black's
>defence weaknesses in order to quickly find the line. Otherwise it's just a
>matter of plys!!
>
>Of course, there are other good moves for white, such as 1.a4, that eventually
>leads to 2.Nf6! But nothing seems faster and harder than 1.Nf6!
>
>Ruffian 1.05 doesn't see reaching depth 14 after 1:34 minutes with 128 Mb Hash
>(Athlon 1800+, 512 Mb DDR).
>
>I bet this is an easy test for the CM.

It is quite tough for Gothmog on a PIV 2.4GHz.  The solution is found at
ply 13, after almost 12 minutes.  My branching factor is rather bad here,
because the best move changes so often:
 1        0.80     0.00         67 d3d4
 2        0.59     0.00        704 a2a4 b5c7
 3        1.09     0.01       1676 a2a4 b5c7 f3d4
 4        0.55     0.05       7058 a2a4 b5c7 f3d4 c7d5
 5        0.77     0.17      20265 a2a4 b5c7 d3d4 c7d5 e1g3
 6    <=  0.75     0.55      63480 a2a4 b5c7 d3d4 c7d5 e1g3 g8h8
 6    <=  0.73     0.59      69108 a2a4 b5c7 d3d4 c7d5 e1g3 g8h8
 6    <=  0.70     0.67      80708 a2a4 b5c7 d3d4 c7d5 e1g3 g8h8
 6    >=  0.64     0.71      86093 a2a4 b5c7 f3d4 c7d5 e1g3 g8h8
 6    >=  0.66     0.71      86669 a2a4 b5c7 f3d4 c7d5 e1g3 g8h8
 6    <=  0.69     0.73      91077 a2a4 b5c7 f3d4 c7d5 e1g3 g8h8
 6    <=  0.67     0.76      95327 a2a4 b5c7 f3d4 c7d5 e1g3 g8h8
 6    <=  0.66     0.78      99007 a2a4 b5c7 f3d4 c7d5 e1g3 g8h8
 6        0.66     0.78      99007 a2a4 b5c7 f3d4 c7d5 e1g3 g8h8
 7    >=  0.66     0.86     109987 a2a4 b5c7 f3d4 c7d5 e1g3 g8h8 f1f2
 7    >=  0.67     0.86     110798 a2a4 b5c7 f3d4 c7d5 e1g3 g8h8 f1f2
 7    >=  0.73     0.89     114699 a2a4 b5c7 d3d4 c7d5 e1g3 c8d7 f3d2
 7    <=  0.86     1.00     131657 a2a4 b5c7 d3d4 c7d5 e1g3 c8d7 f3d2
 7    <=  0.84     1.01     135054 a2a4 b5c7 d3d4 c7d5 e1g3 c8d7 f3d2
 7    <=  0.81     1.02     139778 a2a4 b5c7 d3d4 c7d5 e1g3 c8d7 f3d2
 7    >=  0.75     1.03     141098 a2a4 b5c7 d3d4 c7d5 e1g3 c8d7 f3d2
 7    >=  0.77     1.03     142387 a2a4 b5c7 d3d4 c7d5 e1g3 c8d7 f3d2
 7    <=  0.80     1.08     151286 a2a4 b5c7 d3d4 c7d5 e1g3 c8d7 f3d2
 7    <=  0.78     1.12     159720 a2a4 b5c7 d3d4 c7d5 e1g3 c8d7 f3d2
 7    <=  0.77     1.14     164585 a2a4 b5c7 d3d4 c7d5 e1g3 c8d7 f3d2
 7        0.77     1.14     164585 a2a4 b5c7 d3d4 c7d5 e1g3 c8d7 f3d2
 8    <=  0.75     3.41     508111 a2a4 b5c7 d3d4 c7d5 e1g3 g8h8 f3d2 f7f6
 8    <=  0.73     3.59     554576 a2a4 b5c7 d3d4 c7d5 e1g3 g8h8 f3d2 f7f6
 8    >=  0.72     3.78     590323 a2a4 b5c7 d3d4 c7d5 e1g3 g8h8 f3g5 f7f5
 8    >=  0.73     3.79     593503 a2a4 b5c7 d3d4 c7d5 e1g3 g8h8 f3g5 f7f5
 8        0.73     3.79     593503 a2a4 b5c7 d3d4 c7d5 e1g3 g8h8 f3g5 f7f5
 9    >=  0.73     9.29    1611091 e1e3 d8d5 f3d2 c8d7 a2a4 b5c7 e3g3 g8h8
                                   d3d4
 9    >=  0.75     9.46    1652998 e1e3 d8d5 f3d2 c8d7 a2a4 b5c7 e3g3 g8h8
                                   d3d4
 9    <=  0.80    11.37    2011184 e1e3 b5c7 f3g5 c7d5 e3g3 b7b5 d3d4 f7f6
                                   g5h3
 9    <=  0.78    11.45    2035267 e1e3 b5c7 f3g5 c7d5 e3g3 b7b5 d3d4 f7f6
                                   g5h3
 9    <=  0.75    11.63    2076149 e1e3 b5c7 f3g5 c7d5 e3g3 b7b5 d3d4 f7f6
                                   g5h3
 9        0.75    11.64    2076149 e1e3 b5c7 f3g5 c7d5 e3g3 b7b5 d3d4 f7f6
                                   g5h3
10    <=  0.73    30.86    5655681 e1e3 b5c7 f3g5 c7d5 e3g3 h7h6 g5h3 g8h8
                                   d3d4
10    <=  0.72    34.36    6400254 e1e3 b5c7 f3g5 c7d5 e3g3 h7h6 g5h3 g8h8
                                   d3d4
10    <=  0.69    39.25    7458890 e1e3 b5c7 f3g5 c7d5 e3g3 h7h6 g5h3 e7h4
                                   g3g4 f7f5
10    >=  0.62    43.20    8256501 a2a4 b5c7 d3d4 c7d5 e1g3 g8h8 f3g5 f7f6
10    >=  0.64    43.26    8279734 a2a4 b5c7 d3d4 c7d5 e1g3 g8h8 f3g5 f7f6
10    <=  0.67    45.07    8727225 a2a4 b5c7 d3d4 c7d5 e1g3 g8h8 f3g5 f7f6
10    <=  0.66    47.88    9374025 a2a4 b5c7 d3d4 c7d5 e1g3 d5e3 f1f2 e3f5
                                   g3h3 d8d5
10    >=  0.66    47.97    9398741 a2a4 b5c7 d3d4 c7d5 e1g3 d5e3 f1f2 e3f5
                                   g3f4 d8d5
10        0.66    47.98    9398741 a2a4 b5c7 d3d4 c7d5 e1g3 d5e3 f1f2 e3f5
                                   g3f4 d8d5
11    >=  0.66    50.37    9873452 a2a4 b5c7 d3d4 c7d5 b2a3 c8d7 a3e7 d8e7
                                   e1g3 b7b5 f3g5
11    >=  0.67    50.64    9959561 a2a4 b5c7 d3d4 c7d5 b2a3 c8d7 a3e7 d8e7
                                   e1g3 b7b5 f3g5
11    >=  0.73    56.48   11086394 a2a4 b5c7 d3d4 c7d5 b2a3 c8d7 e1g3 e7a3
                                   a1a3 b7b5 f3g5
11    <=  0.86     1:04   12619400 a2a4 b5c7 d3d4 c7d5 b2a3 c8d7 e1g3 e7a3
                                   a1a3 g8h8 f3g5
11    <=  0.84     1:06   13078904 a2a4 b5c7 d3d4 c7d5 b2a3 c8d7 e1g3 e7a3
                                   a1a3 g8h8 f3g5
11    <=  0.81     1:08   13488270 a2a4 b5c7 d3d4 c7d5 b2a3 c8d7 e1g3 e7a3
                                   a1a3 g8h8 f3g5
11    <=  0.73     1:21   16204325 a2a4 b5c7 d3d4 c7d5 b2a3 e7a3 a1a3
11        0.73     1:21   16204325 a2a4 b5c7 d3d4 c7d5 b2a3 e7a3 a1a3
12    <=  0.72     3:13   37548012 a2a4 b5c7 d3d4 c7d5 b2a3 e7a3 a1a3 g8h8
12    <=  0.70     4:05   47935725 a2a4 b5c7 d3d4 c7d5 b2a3 e7a3 a1a3 g8h8
12    <=  0.67     5:53   68947673 a2a4 b5c7 d3d4 c7d5 b2a3 e7a3 a1a3 g8h8
12    >=  0.61     5:57   69744453 a2a4 b5c7 d3d4 c7d5 b2a3 e7a3 a1a3 g8h8
12    >=  0.62     5:57   69920591 a2a4 b5c7 d3d4 c7d5 b2a3 e7a3 a1a3 g8h8
                                   e1g3 c8d7 f3g5 f7f6
12    <=  0.66     6:44   79712874 a2a4 b5c7 d3d4 c7d5 b2a3 e7a3 a1a3 g8h8
                                   e1g3 c8d7 f3g5 f7f6
12    >=  0.66     6:59   82664986 d3d4 g8h8 a2a4 b5c7 b2a3 e7a3 a1a3 c7d5
                                   e1g3 c8d7 f1c1
12        0.66     6:59   82664986 d3d4 g8h8 a2a4 b5c7 b2a3 e7a3 a1a3 c7d5
                                   e1g3 c8d7 f1c1
13    >=  0.66     9:21  109784472 a2a4 b5c7 b2d4 c7d5 e1g3 c8d7 f3g5 h7h6
                                   g5h3 e7h4
13    >=  0.67    11:54  139031540 e4f6 g7f6 e1g3 g8h8 e5f6 e7f6 f3e5 c8d7
                                   f1f6 d8f6 e5f7 f8f7 b2f6 f7f6 g3e5
13    >=  0.73    11:59  140372869 e4f6 g7f6 e1g3 g8h8 e5f6 e7f6 f3e5 c8d7
                                   f1f6 d8f6 e5f7 f8f7 b2f6 f7f6 g3e5
13    >=  0.88    12:11  142829722 e4f6 g7f6 e1g3 g8h8 e5f6 e7f6 f3e5 c8d7
                                   f1f6 d8f6
13    >=  1.12    12:38  148294596 e4f6 g7f6 e1g3 g8h8 e5f6 e7f6 f3e5 c8d7
                                   f1f6 d8f6
13    >=  1.52    13:19  156512802 e4f6 g7f6 e1g3 g8h8 e5f6 e7f6 f3e5 c8d7
                                   f1f6 d8f6
13    <=  2.06    13:35  159724949 e4f6 g7f6 e1g3 g8h8 e5f6 e7f6 f3e5 b5d4
                                   f1f6 d8f6 b2d4
13    <=  2.05    13:36  160058315 e4f6 g7f6 e1g3 g8h8 e5f6 e7f6 f3e5 b5d4
                                   f1f6 d8f6 b2d4
13    <=  2.02    13:37  160342210 e4f6 g7f6 e1g3 g8h8 e5f6 e7f6 f3e5 b5d4
                                   f1f6 d8f6 b2d4
13    >=  1.95    14:42  173186467 e4f6 g7f6 e1g3 g8h8 e5f6 e7f6 f3e5 b5d4
                                   f1f6 d8f6 b2d4
13    >=  1.97    14:53  175620117 e4f6 g7f6 e1g3 g8h8 e5f6 e7f6 f3e5 b5d4
                                   f1f6 d8f6 b2d4
13    <=  2.00    14:57  176415943 e4f6 g7f6 e1g3 g8h8 e5f6 e7f6 f3e5 b5d4
                                   f1f6 d8f6 b2d4
13    <=  1.98    14:57  176683311 e4f6 g7f6 e1g3 g8h8 e5f6 e7f6 f3e5 b5d4
                                   f1f6 d8f6 b2d4
13    >=  1.98    15:06  178658865 e4f6 g7f6 e1g3 g8h8 e5f6 e7f6 f3e5 b5d4
                                   f1f6 d8f6 b2d4
13        1.98    15:06  178658865 e4f6 g7f6 e1g3 g8h8 e5f6 e7f6 f3e5 b5d4
                                   f1f6 d8f6 b2d4

Tord



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