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Subject: Re: Difficult test position

Author: John Stanback

Date: 08:51:28 10/15/99

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Here's Zarkov's output (K6-333):

00:01.0    33920  5>    44  a5 Nb4 Nb6 Rf8 Qxf8 Nxc2 Qxg7 Qxb3 Qxh7 Qxe3+ Kh2
00:01.4    46464  5     76  a5 Qf7 Qd4+ Kb8 Nd6 Rf1+ Kh2 Qe6 Nxe4 Qxb3
00:01.8    70912  5     80  Qd4+ Kb8 Nd2 Nf2 Rc4 Nxh3+ gxh3 Qxh3 Qe5+ Ka7
00:02.2   100709  6>    80  Qd4+ Kb8 Nd2 Nf2 Rc4 Nxh3+ gxh3 Qxh3 Qe5+ Ka7
00:03.7   184832  6     98  Qd4+ Kb8 Nd2 Rf2 Qd8+ Ka7 Rc8 Qxc8 Qxc8 Rxd2
00:04.3   218769  6    140  a5 Qf7 Nd6 Qxb3 Rc8 Rf1+ Kh2 Nb4 Ra8+
00:04.9   259328  6    146  a5 Qf5 Nd6 Rxd6 Qxd6 Qxa5 Qd4+ Qb6
00:06.4   365781  7>   146  a5 Qf5 Nd6 Rxd6 Qxd6 Qxa5 Qd4+ Qb6
00:07.8   455296  7    135  a5 Qf5 Nd6 Rxd6 Qxd6 Qxa5 Qd4+ Qb6 g4
00:14.3   901546  8>   135  a5 Qf5 Nd6 Rxd6 Qxd6 Qxa5 Qd4+ Qb6 g4
00:19.2  1193600  8    140  a5 Qf5 Qd4+ Qc5 Qxe4 Nb4 Rd2 Qf5 Qd4+ Kb8 Qd8+
00:39.0  2502092  9>   140  a5 Qf5 Qd4+ Qc5 Qxe4 Nb4 Rd2 Qf5 Qd4+ Kb8 Qd8+
00:47.6  3018042  9    207  a5 Qf5 Nb6 Rf8 Qd4 Qf1+ Kh2 Rd8 Qxd8 Nb4 Nc8+
00:57.8  3679642  9    297  a5 Qxc4 bxc4 Nb4 Qd4+ b6 axb6+ Rxb6 Kh2 Nxc2 Qxe4
01:29.5  5627136  9    337  a5 Rf5 Nb6 Rxa5 Nc8+ Ka8 Qxa5 Qxb3 Qc7 Qb1+ Kh2
02:36.7  9920722 10>   337  a5 Rf5 Nb6 Rxa5 Nc8+ Ka8 Qxa5 Qxb3 Qc7 Qb1+ Kh2

John


On October 14, 1999 at 21:27:35, James Robertson wrote:

>Today in a 5 2 blitz game on FICS, my program reached this position and played
>a5!, which wins. I guess this shows the advantages of a permanent brain, as it
>couldn't find the same move in over one and a half minutes after the game.
>
>3Q4/kp4pp/p3qr2/8/P1N1p3/1P1nP2P/2R3P1/6K1 w - - bm a5;
>
>How long does it take your program to see a5 as substantially better than Qd4?
>If you program gives a5 a score of about 1 to 1.5 pawns for white, it isn't
>seeing everything. :)
>
>CM5500:          6 seconds!
>Crafty 16.18:    55 seconds
>Insomniac 0.54:  1 min, 43 seconds
>Crafty 16.16:    1 min, 59 seconds
>
>Insomniac's results on a P233, 4MB hash (it had a 4MB hash in the game too).
>
> 1      23        0          47  Qc7
> 2      19       60         298  Qc7 Qf7
> 3      17       60        2131  Qd4+ Kb8 Qd8+ Qc8 Qd4
> 4     122      280        8323  Qh8 Qf7 Qxh7 Rf1+ Kh2
> 5>    122      330       18382  Qd4+ Kb8 Qd8+ Ka7
> 5     122      330       19133  Qd4+ Kb8 Qd8+ Ka7
> 6     103      500       43431  Qd4+ Kb8 Qd8+ Ka7 Qh8
> 7     103     1100      125435  Qd4+ Kb8 Qd8+ Ka7 Qh8 Qf7 Qxh7 Rf1+ Kh2 Qc7+ g3
> 8     103     4290      582670  Qd4+ Kb8 Nd2 Nf2 Qd8+ Ka7 Nc4 Nd3
> 9     103    13350     1871680  Qd4+ Kb8 Qd8+ Ka7
>10     113    33120     4722362  Qd4+ Kb8 Nd2 Nf2 Rc4 Rf7 Nxe4 Rd7 Nc5 Rxd4 Nxe6
> Rxc4 bxc4
>11>    385   103760    14085444  a5 Qf5 Nb6 Qf1+ Kh2 Rf8 Qd4 Kb8 Nd7+ Ka8 Nxf8 Q
>xf8 Qxe4
>11     385   103870    14101461  a5 Qf5 Nb6 Qf1+ Kh2 Rf8 Qd4 Kb8 Nd7+ Ka8 Nxf8 Q
>xf8 Qxe4



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