Leo in the main role 1


This is the first special example file for the 27th TT CCM C 3.3.2010.

Mostly lighter ideas, with exception of #2 by French duo.
Jean Oudot
Feenschach 1965

1...LEc2 2.LEa1#

1.LEh8! zz
1...LE~ 2.LEd4#
1...LEa1! 2.LExa1#
1...e3 2.LEh4#
1...S~ 2.LEa8#
1...c2 2.LEa1#

Long range mates by white leo are powered by black correction executed by black leo.









#2 (5+7)
1+1 leo

Jean-Marc Loustau
Jacques Rotenberg

1st Prize diagrammes 1985-87

1...Be2 a 2.LEaxe2# A
1...Bc2 b 2.LE6e2# B
1...Be4 c 2.LEb2e2# C
1...d6 d 2.Rfxd3# D

1.LEee5? th. 2.Rfxd3# D
1...d6! d

1.LEb2e5! th. 2.Rfxd3#
1...Be2 a 2.LE6xe2# B
1...Bc2 b 2.LE5e2# C
1...Be4 c 2.LEae2# A
1...d6 2.f5#
(1...Bf1 2.Rxf1#
1...Kh5 2.Rh3#)

Lacny cycle of three mates by leos on the same square, as answers to three defences by the same bishop. The change is motivated by activation and deactivation of leo lines leading to e2. Additional threat paradox is chinese-typical, but adds only a little value.









#2 (11+6)
4+0 leo

Mircea Manolescu
Problemkiste 2001

1.Rh8! LExh8 2.Kh7 LEa8 3.Kh8 LEh1 4.Rf3 LEa1#

Black leo visits all corners and returns back to a1. This manoeuvre has already appread in many forms.









s#4 (4+3)
Maximummer
0+1 leo

Stephen Emmerson
The Problemist Supplement 1997

a) 1.Kd4(+c3) LExc3 2.Kxc3(+d4) LEh8#

b) 1.Kc4(+c3) LExc3 2.Kxc3(+c4) LEc8#

Black is quite constrained in his movement possibilities, although he would like to simply wait for White to move one leo to the line of other leo. No way... so the combination of Sentinelles and leo effects have to be employed in diagonal-orthogonal correspondence.









h#2 (6+2)
Sentinelles
2+0 leo
b) d3 -» e3

Petko A. Petkov
dedicated to Hans Gruber
feenschach 2003

1.Be1 LEd2 2.Re6 Sc3#

1.Qh6 LEa8 2.Bf6 Ba7#

1.Qd8 LEc7 2.Rc4 Sb6#

Three critical moves of the leo are followed by the antibattery mates. Two of them are indirect, aimed at a5, one direct.









h#2 (4+6)
1+0 leo
3.1.1.1

James Quah
The Problemist Supplement 1993

1.Qh2 LEg2 2.Qb8 LEhh1#

1.Qg2 LEh8 2.Qb7 LEgg8#

If bQ blocks b7, white has to mate along the 8th rank, in bQ blocks b8, white has to mate along the long diagonal. This means bringing pair of leos on the mentioned lines and the move order is determined by temporary gate closing by bQ. Nice position.









h#2 (5+2)
2+0 leo
2.1.1.1

Krzysztof Drazkowski
Problem Online 2005

a) 1.Se5+ Rxg5 2.Kxg5 Qf6#

b) 1.LEe4+ Qxg4+ 2.hxg4 Rh7#

Two lion- (or Chinese-) typical unpins by check are underlined by normal interference unpins, allowing exchange of functions of wR and wQ.









h#2 (3+11)
2+0 leo
b) black pawn f7

Comments to Juraj Lörinc.
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