[Retros] 6-fold pin

Christoph Fieberg christoph at fieberg.com
Sun Nov 12 17:30:38 EST 2006

6-fold pin:

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


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


>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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