[Retros] 6-fold pin

[Christoph Fieberg]

6-fold pin:

8/2B3B1/3n1n2/2RbkbR1/3rpr2/2B1K1B1/8/7Q w - - 0 1

1.Qh1xe4#

This to achieve in a SPG would be a real challenge.

Regards,
Christoph


>Date: Sun, 12 Nov 2006 08:23:24 +0100 (CET)

>From: Nicolas.Dupont at math.univ-lille1.fr

>To: afretro at yandex.ru, "The Retrograde Analysis Mailing List" 

><retros at janko.at>

>Andrey asked :

>

> > How many pins can be effective in the mate position of an SPG (regardless

> > of the mating piece)? Three? Four? Or even more?

>

>It's not so complicated to get four...

>

>1.Pa2-a4   Ph7-h5   2.Pa4-a5   Ph5-h4   3.Pa5-a6   Ph4-h3

>4.Pa6xb7   Ph3xg2   5.Ph2-h4   Pa7-a5   6.Ph4-h5   Pa5-a4

>7.Ph5-h6   Pa4-a3   8.Ph6-h7   Pa3-a2   9.Th1-h6   Pa2xb1=T

>10.Cg1-h3   Pg2-g1=T 11.Ta1-a3   Tg1-g5   12.Ta3-g3   Ta8-a1

>13.Ph7xg8=T Cb8-a6   14.Pb7-b8=T Fc8-b7   15.Tb8-c8   Fb7-h1

>16.Pe2-e4   Pc7-c5   17.Ff1-b5   Pc5-c4   18.Dd1-h5   Tg5-c5

>19.Pf2-f3   Pe7-e5   20.Th6-e6

>

>Obtaining five effective pins needs of course a completely different kind

>of strategy (the thematic king must probably stand around the center of

>the board). It should probably exists, although I have strictly no idea of

>how getting it.

>

>Other researches can be made on that 4-pins task. For examples :

>- fewer moves

>- no visible promoted piece

>- AUW-like

>

>

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