Immobilization of hurdle 2

After some search I managed to find more examples for our 1st section of 7th TT CCM, below you can find some direct problems. The last one is questionable, but nevertheless interesting!
Brian Stephenson
F1632 The Problemist July 1996

1.LExd3! zz,
1...e6 2.LExd7#
1...e5 2.LEb5#
1...LEg6 2.LEa6#
1...LEe4 2.LEc4#
1...Sg4 2.LEh3#
1...Sf3 2.LEf1#
(1...Sf1 2.Rc1#)

Here we have 6 variations with the same effects of mating move: it opens the battery of VAh7 over black leo, that must be properly immobilized, what is done by direct Madrasi paralysis determining precise move of firing piece.









#2 (8+7)
Madrasi
1+1 leo, 1+0 pao, 2+0 vao
Juraj Brabec
Ludovit Lehen
1st Prize Sachove Umenie 1993

1.LEbd5? th. 2.Qd1#
1...Gc3, Rxb2, Sb3, Se2
2.!, LEg6#, LEh7#, LEe4#

1.LEhd7? th. 2.Qd1#
1...Gc3, Rxb2, Sb3, Se2
2.LEg6#, !, LEe4#, LEh7#

1.LEfd6! th. 2.Qd1#
1...Gc3, Rxb2, Sb3, Se2
2.LEh7#, LEe4#, LEe2#, LEg6#

Three thematical mates by white leos (LEg6#, LEh7#, LEe4#) use specific immobilization of LEd3 by indirect paralysis (arrival of hurdle between LEd3 and white leos LEd8 and LEf1) by white in keys and by black in Se2 defence. Additional mate (LEe2#) in solution is is not thematical. It pays to study motivation of Brabec&Lehen fairy twomovers...









#2 (12+11)
Madrasi
1+3 grasshopper, 0+1 nightriderhopper, 6+2 leo
Juraj Brabec
6th Prize Kotesovec 40 C 29.7.1996

1.Bf3? th. 2.LEd3#
1...Gd8, Ga1, Bf5
2.Qc4#, Qb5#, LEa6#
1...Ba6!

1.Bc4? th. 2.LEd3#
1...Gd8, Ga1, Bf5
2.Qf5#, Qxb4#, Qb5#
1...Gb5!

1.Bb5! th. 2.LEd3#
1...Gd8, Ga1, Bf5
2.Qxb4#, Qf5#, Qc4#

Battery mates over Gb4 use two kinds of effects immobilizing this grasshopper: 1. withdrawals by wQ and bGs, 2. interferences on b-file and 4-th rank by wQ and wB (taking in account black mass on b6 and d4). Together we have Z-33-35, rather unusual but spectacular theme.









#2 (10+16)
3+5 grasshopper, 1+0 leo
John Rice
1st Comm Chinese pieces TT C 30.9.1997

1.a6! th. 2.PAa5+ VAa4 3.VAb5#
1...PAxd8 2.PAc1+ Kd6, Kd4 3.VAf4#, VAf6#
1...PAxd1 2.PAc8+ Kd6, Kd4 3.VAf4#, VAf6#
1...PA3d6 2.PAc1+ Kd4 3.VAf6#
1...PA7d4 2.PAc8+ Kd6 3.VAf4#
1...MAxc6 2.VAe7+ MAe5, PA3d5, PA7d5 3.MAxd7#, PAc1#, PAd6#
1...MAxc4 2.VAe3+ MAe5, PA3d5, PA7d5 3.MAxd3#, PAc8#, PAd4#

In this problem, everything in variations goes in pairs as the position is symmetrical with axis beeing the 5th rank. The mates VAf4#, VAf6# are interesting from "immobilization point of view" - they are over knight pinned in the course of play by king move and use special feature of Chinese knight (mao) - line of move that isn't linear. So here we have immobilization by pinning.

+++ Composition In the Spotlight (CIS) No. 7 +++

Spotlight comment by Juraj Lörinc:

All ways are going to Rome (or how exactly is this old Latin saying translated to English?). Yesterday I met this threemover again... for the first time it was in the award of TT published in Problemist Supplement. Then again when I was looking for problems showing mates by hoppers (and similar pieces) over enemy immobilized units. For the third time about half a year ago, when I was composing for today closed JT of Brian Stephenson. For the fourth time it went through my hands about 3 months ago in the first round of FIDE Album judging and finally yesterday in the second round of FIDE Album judging. Do you have similar experience - that some position appears again and again in the most unexpected contexts?









#3 (15+7)
3+1 mao (b2), 3+1 vao (b5), 4+2 pao
bernd ellinghoven
Hans Gruber
Hans Peter Rehm
Prize Paisley TT 1995

1.PAa4(pb4)+? Ke4(pd4)!
1.VAa7(pb6)+? Ke3(pd4)!

1.PA1b3! th. 2.PAd3(pb3) ~ 3.PAd1(pd3)# or 3.PAd2(pd3)#
1...VAd5(pg2) 2.PAa4(pb4)+! VAc4(pd5) 3.b5#
1...PAc3(pg3) 2.VAa7(pb6)+! PAc5(pc3) 3.b7#
(1...VAf3(pg2) 2.PAa3(pb3)! ~ 3.VAa7(pb6)#)

Battery mates by white pawns are here very special case. In VAd5 variation, in mating position VAc4 can leave mating line a4-d4, but it doesn't help black as he drops pawn at c4 anyway. PAc3 variation is similar. Someone can try to use this way of mating...

Theme of the problem, btw :-), is very interesting, it excellently uses given combination of fairy elements and shows doubled Dresden theme in the form of Brunner.









#3 (10+7)
Sentinelles
2+1 pao, 2+2 vao

Comments to Juraj Lörinc.
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