Author: Heiner Marxen
Date: 14:47:38 05/05/01
Go up one level in this thread
On May 05, 2001 at 12:41:18, Paul wrote:
>On May 05, 2001 at 11:55:58, leonid wrote:
>
>>Hello!
>>
>>If you would like to solve very easy mate, you can do this by solving one
>>position from two, or both.
>>
>>[D]qk1r4/bpp1R1p1/pB1pnp2/N1Nb3p/2P1P3/QRnP2PB/5PK1/1r6 w - -
>
>Hi Leonid,
>
>this one is instantly solved by Pretz as a mate in 9:
>
>00:00 WM9 07 Nc6+ Bxc6 Nxa6+ bxa6 Bxc7+ Kc8 Qxa6+ Qb7 Bxe6+ Rd7 Bxd7+ Kxc7 Bxc6+
>Kc8 Qxb7+ Kd8 Re8#
As always, Pretz is faster than Chest. As often, Pretz in fact finds the
shortest possible mate. I'm impressed, really!
1.Nc6+ is the only key for mate in 9. Without duals this is a complete
solution tree:
Nc6+ Bxc6 Nxa6+ bxa6 Bxc7+ Kc8 Qxa6+ Qb7 Bxe6+ Rd7 Bxd7+ Kxc7 Bxc6+ Kc8 Bxb7+
=*= Qxd6#
Kd8 Re8+
Kc7 Qxb7#
Kb8 Qxb7#
Bxd7 Qxb7#
Bd7 Qxb7#
Bb7 Bxe6+ Rd7 Bxd7+ Kxc7 Be6+ =*= Qxd6#
Kc8 Rxc7#
bxc6 Bxc7+ Kc8 Qxa6+ Qb7 Qxb7#
Kc8 Rxc7#
Took 48.1 minutes on K7/600 with 350 MB, so it wasn't exactly "easy" for Chest.
>>[D]3k4/b2r4/4q3/2q3n1/1nnNbqnN/1Q1qpNBQ/r1BPQPp1/qNQRKR1N b - -
>
>And this one took a while longer as usual with your creations :), mate in 8:
>
>01:22 BM8 07 exf2+ Nxf2 Qaxd4 Bxd3 Qxf2+ Bxf2 Qxf2+ Rxf2 Bxf2+ Qxf2 Bxd3+ Qe3
>g1=Q+ Nxg1 Qf2#
>
>Greetings,
>Paul
Oh yes, this one is harder. Up to now I know that there is no mate in 6
(471 secs), and the effective branching factor appears to be above 20.
Therefore I estimate well over 2 days for the mate in 8 to complete.
I think I will let him do it. OTOH, within these two days Leonid will
come up with at least two more of these ;-) Such is life.
Groetjes,
Heiner
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