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MatPlus.Net Forum General White Line Combinations in Selfmate

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I think, this mechanism is not new.
Following position is quite ugly too, but saves one third of pieces:

(= 8+10 )
s#2

1.Rb5! f5 2.d4+ Ke4#
1.- c:b5 2.Qd5+ K:d5#

Without Pe6 we would have also 1.- e6 2.Qd4+, but there are cooks.

@Frank: My beef here would be that Rb4 stands behind the Q,
so "three lines" is debatable. What about

(= 11+10 )

with sort of a "Sonderform"? (White first opens the line
which is subsequently closed). Also, I immediately see the
possibility that Se3 could threat something like Sxg4 Rxg4#.

EDIT: Like this?
(= 11+10 )

WR is unused.

True, but not exactly an unknown blemish
considering the same theme in the #2. :-)

(= 10+11 )

At least a bit more play and tries with the unused rook.

@Frank: digging up a concrete anticipation would
be of help if I even write an article :-)

P1202658
4193 Schach , p. 60, 02/1963
(= 8+14 )
s#2

1.Bh5! [2.Bxf3+ Bxf3#]
1... g4 2.c4+ Ke4#
1... c4 2.e4+ Kc5#

Move Be8->g6, then 1.Bg6-h5 will unguard e4.

Another example:

P1250119
Laszlo Talaber
340 Problem 05/1953
1st Prize
(= 11+13 )
s#2

1.Qc3! ~ 2.Rf4+ Kxf4#
1...Sb1/Sb3 2.Se3+ Qxe3#
1...Sf3 2.e4+ Kf4#
1...Se4 2.dxe4+ Kf4#
1...Sc4 2.Qxf6+ Kxf6#

The g4 square (more precisely, the mating line) is attacked by two white linear pieces bR and wB (indirectly after e4+).
It is possible to get a third guard of g4 by changing the position a little:

(= 11+13 )

or
(= 11+13 )
1.Qh8? f6! 1.Qc3!

(27) Posted by Hauke Reddmann [Sunday, Sep 24, 2023 18:36]

@Viktoras: THX for the interesting examples.
Note, though, that in the latter ones Sf3 doesn't (preemptively)
cut a line to a flight but a line to an interference.