Author: Heiner Marxen
Date: 18:12:15 05/01/01
Go up one level in this thread
On May 01, 2001 at 19:22:22, Paul wrote:
>On May 01, 2001 at 18:59:04, Paul wrote:
>
>>On May 01, 2001 at 17:55:59, Heiner Marxen wrote:
>>
>>>Here are two PV lines from Chest:
>>>
>>>Qbxd8+ Qxd8 Qhxd8+ Nxd8 Qxd8+ Qxd8 gxf8Q+ Rxf8 Qxf7+ Rxf7 h8=Q+ Nf8
>>>Qxf8+ Rxf8 Rxd8+ Ke7 Bg5+ Rf6 Bxf6+ Kf7 Rf8+ Kxf8 Nxe6+ Ke8
>>>Qe7#
>>>
>>>Qdxd8+ Qgxd8 Qhxd8+ Nxd8 Qxd8+ Qxd8 gxf8Q+ Rxf8 Qxf7+ Rxf7 h8=Q+ Nf8
>>>Qxf8+ Rxf8 Rxd8+ Ke7 Bg5+ Rf6 Bxf6+ Kf7 Rf8+ Kxf8 Nxe6+ Ke8
>>>Qe7#
>>>
>>>They are basically equal. Other black moves lead to shorter solutions, except:
>>>8... Kxd8 Nxe6+ Bxe6 Bg5+ Kc8 Qexb8+ Qxb8 Qaxb8+ Kd7 Qe7#
>>> Kd7 Nxb8+ Kc8 Nxc6+ Kd7 Qed6#
>>> Qb8 Qbb7#
>>> Qxb8 Qe7+ Kc8 Qexb8#
>>> Rxb8 Qe7+ Kc8 Qd8#
>>> Rf6 Qxf6+ Kd7 Qfe7+ Kc8 Qd8#
>>
>>Hi Heiner,
>>
>>This was a nice position wasn't it? This is the second time in about 2 weeks
>>we've had a mate in 13 that's really a mate in 13! :)
>>
>>Just one question though ... my line was this one:
>>
>>1. Qbxd8+ Qxd8 2. Qhxd8+ Nxd8 3. Qxd8+ Qxd8 4. gxf8=Q+ Rxf8 5. Qxf7+ Rxf7 6.
>>h8=Q+ Nf8 7. Qxf8+ Rxf8 8. Rxd8+ Kxd8 9. Nxe6+ Bxe6 10. Bg5+ Kd7 11. Qe7+ Kc8
>>12. Qexb8+ Qxb8 13. Qxb8#
>>
>>which is the first of your 2 lines, with the 8... Kxd8 deviation, but then at
>>move 11 another deviation: Qe7+, you don't mention that one? I have a bug?
>
>Never mind ... I see now that you only mention other black moves ... :)
>
>Groetjes,
>Paul
Exactly!
Often I leave out duals (alternate attacker moves), except at the top level.
Including duals at all levels can explode the solution tree sometimes.
Here is the complete solution tree with all duals after 10...Kd7:
Nxb8+ Kc8 Nxc6+ Kd7 Qbd6#
Qe7#
Qed6#
Qb8 Qbb7#
Qxb8 Qe7+ Kc8 Qaxb8#
Qexb8#
Rxb8 Qe7+ Kc8 Qd8#
Ke8 Qe7#
Qe7+ Kc8 Qaxb8+ Qxb8 Qxb8#
Qexb8+ Qxb8 Qxb8#
Regards,
Heiner
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