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01-Oct-2019

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MatPlus.Net Forum General Mutual Pin
 
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(1) Posted by Hauke Reddmann [Thursday, Oct 10, 2019 13:37]

Mutual Pin


Can you offhand (before I pester Udo :-) - unfortunately,
"mutual pin" is no keyword in the Albrecht) give me some nice
(preferrably 2#) renderings of the following theme:
Two pieces mutually pin themselves, both pins are used *somehow*.
(This should give you enough leeway :-)

I quickly made two near-lying examples to show it:

1. Black pins White but also himself
(= 6+4 )

1.Qd1? Rg1! (B~,xf2?)
1.Rxg6! (2.Qh6) Bxf2 (pins wQ but also bR) 2.Sxf2

2. Black unpins himself but also White
(= 7+5 )

1.Qxe5! (ZZ) 1...f6 2.e8Q, 1...f5 (unpins bR but also wQ) 2.Qh8#

In the latter case Black theoretically could also unpin only himself,
with dual avoidance or whatnot.

Hauke
 
(Read Only)pid=18012
(2) Posted by Geoff Foster [Friday, Oct 11, 2019 05:34]

In WinChloe the theme is "Clouages réciproques". Here is an example:

P.Monreal & Francois Michel
2 Pr Gazeta Czestochowska 1967
(= 10+9 )

1.d5! (>2.Qxf2)
1...Rxd5 2.Sd4
[also 1...Rxe4 2.dxc6]

In the Albrecht collection this problem has the following themes.
, 100C1b , 100C2b , AntiRupp , FesselungSWofD , GegenschachDirektT , indirekteEntfesselungWSofT , indirekteSelbstentfesselungWofD , SelbstfesselungSofT2 ,


Here are some examples of mutual unpin.

Pierre Biscay
Special Pr Die Schwalbe 24th TT 1935
(= 8+4 )

1.Be7! (>2.Sd6)
1...Sf8 2.Qxc4

The 24th TT Die Schwalbe 1935 seems to be about this theme!

Antonio Bottacchi
Good Companions 1919
(= 8+14 )

1.Sg2! (>2.Se3)
1...d5 2.Qf2
1...Bd5 2.Qf8
 
 
(Read Only)pid=18021
(3) Posted by Geoff Foster [Friday, Oct 11, 2019 05:44]

The Albrecht collection has two other examples of the "AntiRupp" theme. Both were composed by Chris Handloser in 2012 and both have similtaneous pin by en passant capture.
 
 
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(4) Posted by [Friday, Oct 11, 2019 06:58]; edited by [19-10-11]

DELETED
 
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(5) Posted by seetharaman kalyan [Friday, Oct 11, 2019 09:04]

The Bottachi example is very nice with two double unpins and excellent dual avoidance.
 
   
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(6) Posted by Hauke Reddmann [Friday, Oct 11, 2019 12:53]; edited by Hauke Reddmann [19-10-11]

@Geoff: "Anti-Rupp" can be done with two pinlines and
an intersection point (e.p. simply "looks better"
than Black capturing into the pinline when done with
mutual pin - the Monreal example) but I explicitely
specified "mutual". Likewise for "Rupp".
(Wow, Chris seems to be a fan of e.p., 28 hits without entering
the year :-)
But props for giving me a theme name and rich material.
(BTW, I just found that you *can* search at least for
"Simultanfesselung" plus "Simultanentfesselung" in the
Albrecht, even with colors.)

(= 15+9 )

So my request would look "a la Chris" ...
1.f4 (2.Qa3) gxf3 2.Rxf6
(EDIT: Bother, doesn't work clean since the pawn interferences -
needs more work)

@everybody else: Made another example (concering my last remark -
has two Führer variants) and sent in to the Augsburger Allgemeine,
but don't hold your breath :-)
 
   
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(7) Posted by Diyan Kostadinov [Friday, Oct 11, 2019 17:11]

I have some old twomovers with mutual pins. Here is one example (sorry, I don't know how to make a diagram here, so notations only):

Diyan Kostadinov
Shahmatna Misal 2004

white: Kh6 Qa5 Ra7 Rf6 Bb8 Bf7 Sb6 Sg3 p.c5 d6 f2 g5 (12)
black: Ke5 Qa8 Rd4 Rd8 Be4 Sc8 Sd3 p.c4 h7 (9)

1.Qc3? (2.Sxc4#)
1...Sb2 a 2.f4# A
1...Sxb6 b 2.Re7# B
1...Bd5/f5 2.Rf5# X
1...Qd5!

1.Qe1! (2.Rf5# X)
1...Sxe1 c 2.f4# A
1...Se7 d 2.Rxe7# B
1...R4xd6 2.Qc3# (mutual pins)
1...R8xd6 2.Sd7# (mutual pins)
1...Rd5 2.Qxe4#

Pseudo Ruchlis, mutual pins, 3 black pieces play on d5
 
   
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(8) Posted by Nikola Predrag [Friday, Oct 11, 2019 17:49]; edited by Nikola Predrag [19-10-11]

Diyan Kostadinov
Shahmatna Misal 2004
(= 12+9 )
#2
1.Qc3? (2.Sxc4#)
1...Sb2 a 2.f4# A
1...Sxb6 b 2.Re7# B
1...Bd5/f5 2.Rf5# X
1...Qd5!

1.Qe1! (2.Rf5# X)
1...Sxe1 c 2.f4# A
1...Se7 d 2.Rxe7# B
1...R4xd6 2.Qc3# (mutual pins)
1...R8xd6 2.Sd7# (mutual pins)
1...Rd5 2.Qxe4#

Pseudo Ruchlis, mutual pins, 3 black pieces play on d5
 
   
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(9) Posted by Frank Richter [Friday, Oct 11, 2019 22:43]

Nice problem, but there are no MUTUAL pins in the meaning of this thread (A pins B and B pins A).
Or am I wrong?
 
   
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(10) Posted by Hauke Reddmann [Friday, Oct 11, 2019 23:15]

Nope, 2 pin lines. Deosn't hurt much, though :-)
 
   
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(11) Posted by Hauke Reddmann [Saturday, Oct 12, 2019 12:19]

Repair:

(= 10+8 )

1.c4 (2.Qh5) bxc3 2.Rxe4#
 
   
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(12) Posted by Geoff Foster [Monday, Oct 14, 2019 02:05]

Yves Cheylan
Schach-Echo 1972
(= 11+7 )

1.c3? (-) Bxf2!

1.c4! (>2.Qh5)
1...bxc3 ep 2.Rxe4
1...Bxc4 2.Qxc4
1...Bg5 2.Sg3
1...f5 2.Bh5

Also see Albrecht 157904, which is cooked.
 
   
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(13) Posted by Hauke Reddmann [Monday, Oct 14, 2019 13:37]

Would have surprised me if nobody had the idea before me :-)
(OK, shame on me, searching UmkehrRupp + EnPassant in the
Albrecht would have brought it up in no time.) Of course
the Cheylan problem is also there - 149.981 - but not
annotated.
 
   
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(14) Posted by Diyan Kostadinov [Tuesday, Oct 29, 2019 01:32]

Thanks for your help with the diagram of my example Nikola!
And sorry... Yes, there is no mutual pins... I didn't understand in the beginning that the both thematic pieces should pins each other... In my problem we have black selfpins and white pins but there are not mutual pins because black pieces are pinned by another white piece.
 
   
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(15) Posted by Steffen Slumstrup Nielsen [Tuesday, Oct 29, 2019 10:44]

So what is the term for the mechanism in Diyan's problem? "Piece A pins piece B , which pins piece C". I like "chain pin" or "serial pin", but maybe there is already an established term?
 
 
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MatPlus.Net Forum General Mutual Pin