Author: Steffen Jakob
Date: 03:08:01 03/01/99
Go up one level in this thread
On March 01, 1999 at 04:48:28, Will Singleton wrote:
>u2600 Position of the Week
>--------------------------
>
>5R2/8/8/4rp2/3r4/5k2/2B1p2P/2K1R3 w - -
>ArasanX Amateur, 0-1, 1999.02.27, fics
>
>In this position, White played 78. Rg8 and lost. Could your
>program avoid that move within 10 seconds or so? The game might be
>lost in any event (not sure); there is still some play left.
Here is the search output of Hossa:
1 -159 0 13 e1xe2
1 274 0 17 c2xf5
2 273 0 81 c2xf5 e5d5
2 291 0 187 f8xf5 e5xf5 c2xf5
3 291 0 403 f8xf5 e5xf5 c2xf5 d4d5
4 -81 0 2836 f8xf5 e5xf5 c2xf5 f3f2 e1h1
4 150 0 4061 f8g8 d4g4 g8f8
4 162 0 7641 c1b2 f3f2 b2c3
5 -86 0 36127 c1b2 f3f2 f8xf5 e5xf5 e1xe2 f2xe2 c2xf5
5 117 0 39737 f8g8 d4h4 g8g5 h4xh2 c2xf5
6 117 0 58818 f8g8 d4h4 g8g5 h4xh2 c2xf5
7 67 2 253139 f8g8 d4h4 g8g5 f3f2 g5g1 h4xh2 c1b2
8 -139 12 1202421 f8g8 f3f2 g8g1 e5c5 h4 d4c4 c1d2 c4xc2
8 -79 13 1317810 f8xf5 e5xf5 c2xf5 f3f2 e1h1 e2e1Q h1xe1 f2xe1 c1c2
e1e2
8 -78 17 1722230 c2xf5 f3f2 e1h1 e2e1Q h1xe1 f2xe1 c1c2 e1e2
9 -92 24 2514026 c2xf5 f3f2 e1xe2 f2xe2 h3 e5c5 c1b2 d4b4 b2a3 c5b5
f8f6 e2e3
9 -84 27 2769280 f8xf5 e5xf5 c2xf5 f3f2 e1xe2 f2xe2 c1c2 d4c4 c2b3
c4f4 f5e6 f4d4
10 -84 39 4124386 f8xf5 e5xf5 c2xf5 f3f2 e1xe2 f2xe2 c1c2 d4c4 c2b3
c4f4 f5e6 f4d4
11 -79 97 9865034 f8xf5 e5xf5 c2xf5 f3f2 e1xe2 f2xe2 c1c2 d4d5 f5e6
d5d2 c2c3 d2d3 c3c4 e2e3
12 -79 206 21799563 f8xf5 e5xf5 c2xf5 f3f2 e1xe2 f2xe2 c1c2 e2e3 h3 d4d5
f5e6 d5c5 c2b3 e3e4
> Note the wide difference between Amateur and MacChess in their analyses.
>MacChess takes only 3 seconds to discard Rg8, running at over 300k nps.
>Amateur, otoh, takes 43 seconds to realize what's happening (both at ply 9).
>(The follow-on position is also worth a look. Does your prog play 78... Kf2
>quickly?)
If you setup the position aftern move 78.Rg8 Hossa computes this:
1 -703 0 3 d4d2
1 -138 0 7 f4
2 -155 0 79 f4 h4
2 -150 0 300 d4g4 g8f8
3 -150 0 605 d4g4 g8f8
4 -159 0 1642 d4g4 g8xg4 f3xg4 c1d2
4 -150 0 5223 e5a5 g8g3 f3f2 g3g1
4 -117 0 8551 d4h4 g8g5 h4xh2 c2xf5
5 -117 0 12808 d4h4 g8g5 h4xh2 c2xf5
6 -67 1 74535 d4h4 g8g5 f3f2 g5g1 h4xh2 c1b2
7 -67 1 124237 d4h4 g8g5 f3f2 g5g1 h4xh2 c1b2
7 -61 4 392327 f4 c1b2 e5h5 b2c3 d4d6 c2d3
7 139 4 485981 f3f2 g8g1 e5c5 h4 d4c4 c1d2 c4xc2
8 140 5 570007 f3f2 g8g1 e5c5 h4 d4g4 g1h1 g4c4 c1d2
9 162 9 1055563 f3f2 g8g1 e5c5 c1b1 d4g4 g1h1 g4b4 b1c1 b4c4 c1d2
10 166 24 2683851 f3f2 g8g1 e5c5 h4 f4 h5 d4c4 c1d2 c4xc2
11 193 80 8878161 f3f2 g8g1 e5c5 c1b1 d4b4 b1c1 b4c4 c1d2 c4xc2 d2d3 f4
h4 f3
12 193 247 27347295 f3f2 g8g1 e5c5 c1b1 d4b4 b1c1 b4c4 c1d2 c4xc2 d2d3
f4 h4 f3
Greetings,
Steffen.
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