Author: Heiner Marxen
Date: 20:30:05 01/08/02
Go up one level in this thread
On January 08, 2002 at 18:36:47, Roy Eassa wrote:
>On January 07, 2002 at 05:15:38, Dann Corbit wrote:
>
>>On January 07, 2002 at 05:05:31, Jouni Uski wrote:
>>
>>>On January 07, 2002 at 04:59:54, Dann Corbit wrote:
>>>
>>>>On January 07, 2002 at 04:47:50, Will Bundy wrote:
>>>>>Hi
>>>>>
>>>>> In this position Fritz7a announces mate in 8 in 1 sec!!! I expected chessmaster
>>>>>to find it in the same amount of time, didn't happen.
>>>>>
>>>>>
>>>>> 2R2R2/5p2/p3p2p/4P1pk/7N/P5PP/5P1K/1q6 w - g6 id Fritz 7 - ; bm g3g4;
>>>>
>>>>I don't think you can reasonably draw any sensible conclusions from a single
>>>>position. Try it on a couple hundred. If it's faster with a large set of
>>>>positions, then your conclusion is likely to follow. If not, then not.
>>>
>>>Yes it's very difficult to say anything sure! I have tactical test set with 200
>>>positions and still I cannot say sure, which program is the best in solving:
>>>Fritz, Tiger or Goliath. And "toy" programs like Chessmaster I haven't even
>>>tested.
>>
>>The output of Chest319 for this problem:
>>
>>[D]2R2R2/5p2/p3p2p/4P1pk/7N/P5PP/5P1K/1q6 w - g6 acn 18544563; acs 116; bm Rxf7
>>g4+; ce 32752; dm 8; pv g4+ Kxh4 Rh8 Qg6 Rcg8 Qh5 Rh7 f5 exf6ep e5 Rgh8 e4 Rxh6
>>e3 Rxh5#;
>
>After 4...f5, White can also play 5.Rgh8 (instead of 5.exf6ep) and still mate in
>the stipulated timeframe, I believe.
Yes, that is correct. The (partial) solution tree is:
Rgh8 fxg4 Rxh6 gxh3 f3 Qxh6 Rxh6#
-*- Rxh5#
Qxh6 Rxh6#
a5 Rxh5#
g3+ fxg3#
Qe8 Rxe8 h5 Rxh5#
-*- Rxh6#
Rxh6+ Qh5 Rxh5#
Qf7 Rxf7 h5 Rxh5#
-*- Rxh6#
Rxh6+ Qh5 Rxh5#
Qg6 Rxh6+ Qh5 Rxh5#
Qxh6 Rxh6#
Qxg4 Rxh6+ Qh5 Rxh5#
-*- Rxh6 Qxh6 Rxh6#
-*- Rxh5#
exf6ep Qxg4 Rxh6+ Qh5 Rgh8 Qxh6 Rxh6#
-*- Rxh5#
a5 Rgh8 Qe8 Rxe8 h5 Rxh5#
-*- Rxh6#
Rxh6+ Qh5 Rxh5#
Qf7 Rxf7 h5 Rxh5#
-*- Rxh6#
Rxh6+ Qh5 Rxh5#
Qg6 Rxh6+ Qh5 Rxh5#
Qxh6 Rxh6#
Qxg4 Rxh6+ Qh5 Rxh5#
a4 Rxh6 Qxh6 Rxh6#
e5 Rxh5#
e5 Rxh6 Qxh6 Rxh6#
-*- Rxh5#
e5 Rgh8 Qe8 Rxe8 h5 Rxh5#
-*- Rxh6#
Rxh6+ Qh5 Rxh5#
Qf7 Rxf7 h5 Rxh5#
-*- Rxh6#
Rxh6+ Qh5 Rxh5#
Qg6 Rxh6+ Qh5 Rxh5#
Qxh6 Rxh6#
Qxg4 Rxh6+ Qh5 Rxh5#
-*- Rxh6 Qxh6 Rxh6#
-*- Rxh5#
Qe8 Rxe8 h5 Rxh5#
-*- Rxh6#
Rxh6+ Qh5 Rxh5#
Qf7 Rxh6+ Qh5 Rxh5#
Qg6 Rxg6 h5 Rxh5#
-*- Rgxh6#
Rhxh6#
A PV is just a single (hopefully significant) line (of maximal depth).
BTW, the complete solution tree for this mate in 8 is 747000 lines long.
Not suitable to post here :-)
Cheers,
Heiner
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