Twinning by exchange of two statical units 6

This is again special example file for 10th TT CCM dedicated to problems with twinning described in the title. As the time passes, we watch the varying motivations of twinning in question, in different genres. This time I selected helpmate threemovers with twinning including black king. It is surely one of the most interesting twinnings under given constraints. The role of black king is clear - he is mated. Thus only the role of the other twinned pieced may vary.
Vadim Vinokurov
Vladimir I. Zheltonozhko

5th Prize V. Kirillov 50 JT 2001

a) 1...Bc8 2.Bd7 Sb3 3.Bc6 Be6#

b) 1...Re8 2.Re7 Sa6 3.Rd7 Re6#

Thematical black pawn in both positions blocks, it is possible due to his position beside bK. The content is harmonious, nice bicolour Bristol manoeuvres and model mates in echo diagonal-orthogonal.

h#2,5 (4+8)
b) d5 «-» d6

Konrad Kummer
1st Place Switzerland - Italy 1981

a) 1.Rc7 Sc3 2.Bd7 a4 3.Rc6 Sb5#

b) 1.Be8 Se3 2.Td7 Sf5 3.Bf7 Sg7#

The same role of twinned black pawn as in the previous problem - blocking. The content is again based on line play, but different one - anticritical and critical moves, then reciprocal interferences of bR and bB.

h#3 (4+5)
b) d6 «-» e6

Torsten Linß
Suomen Shakki 1988

a) 1.Sef5 Se3 2.Rf1 Re1 3.Rf4 Sc4#

b) 1.Se6 Sf2 2.Rg1 Rf1 3.Rg6 Se4#

Again bp blocks square for bK, this time diagonal one. During the play, wS opens 1st row for bicolour Bristol and everything is finished by doublecheck model mate.

h#3 (3+7)
b) e5 «-» f6

Ofer Comay
3rd Prize Sankt Peterburg 1998

a) 1.Bc7 Be4 2.Bf4 Bc6 3.Bd3 Bb6#

b) 1.Be4 Bc7 2.Bb7 Be5 3.Bd8 Bf5#

And now something completely different... the twinning is very far and thematical black rook determines interception moves of white bishops. The moves by bishops on the same lines in opposite directions are visually attractive, despite good deal of symmetry.

h#3 (3+8)
b) e3 «-» c8

Chris J. Feather
Sakkelet 1996

a) 1.Qg8 dxe8Q 2.Rd3 Qxe3 3.Qb3 Qc1#

b) 1.Qf8 d8Q 2.Bd3 Qh4 3.Qf3 Qe1#

Very nonstandard content. Black queen must unpin wp, but moving down in the direction of later blocking move would close line of promoted wQ. Thus bQ moves in the opposite direction to the eighth rank. Moves by bR and bB to d3 are simple blockings, no Grimshaw. Twinned wS guards mating promoted wQ.

h#3 (4+8)
b) c2 «-» e2

Venelin Alaikov
StrateGems 1999

a) 1.Sg4 Bxb3 2.Rc2 Bg8 3.Be6 Bh7#

b) 1.Bb1 Bxb4 2.Be4 Bf8 3.Bd6 Bg7#

Blocking bp near bK, we've seen that already 3 times. But the play is becoming more and more complicated (probably it is in some connection with increasing number of units on the board.) Clearances of bBs lines, unpin and Bristol manoeuvres.

h#3 (3+10)
b) f5 «-» e5

Chris J. Feather
Prize Israel Ring Tourney 1996-1997

a) 1.Rxg7 Sg4 2.Rc7 Bxb2 3.Rc5 Se5#

b) 1.Qxf6 Se6 2.Qf2 Ba1 3.Qa2 Sd4#

This time the blocking piece isn't black pawn, but black knight. It prevents the cook 1.c3 Se6 2.Kc4 Sg4 3.R,Q,Bb3 Ce5# with some possible intervesions. While Black moves in each solution only only piece (that captures wS and blocks), White knight opens line for bishop, makes anticritical move and mates again by knight.

h#3 (6+8)
b) c4 «-» b3

János Csák
Comm Chess Life 1989

a) 1.Rb4+ Sd5 2.Re4 Ra2 3.Bd4 Sb4#

b) 1.Bc5+ Sa6 2.Ba3 Rg2 3.Rb4 Sc5#

Known pin-unpin is shown here with bK on different squares, strangely, wp always guards the same square. Well, it is not so strange :-), it is only one device available with given theme.

h#3 (5+11)
b) d3 «-» b3

Jurij Gordian
1st-3rd Place 4th Tourney of Cities-Heroes 2000

a) 1.Be2 dxe3 2.Qf4 exf4 3.Bf3 Rg5#

b) 1.Sc2 dxc3 2.Qd4 cxd4 3.Se3 Rf4#

This problem uses in fact only moving of bK as an essential part of mechanism. Twinned bp plays no role in a), while in b) it prevents many cooks involving blocking of e5 by bS via g4.

h#3 (4+13)
b) e4 «-» g4

Comments to Juraj Lörinc.
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