Change of defence motives with cyclic effects 5

Although our 5th TT CCM was already judged, here are some more problems showing change of defence motives with cyclic effects that appeared in 1st Album of Czechoslovak chess compositions. In the meantime I noticed one real difficulty with this kind of problems. It is rather difficult to recognize these themes if a man doesn't know they constitute the content of the problem. Without any doubts, it is one of reasons why this field of chess problems is largely neglected...
Josef Sutara
1st HM Sachove Umeni 1972
In 1st Album of Czechoslovak chess compositions 1972-1973

1.Qb6? th. 2.Qxd6#
1...Kf4 (guarding by line opening - A) 2.Sg6#
1...Sb5 (direct guarding - B) 2.Rxf5#
1...Rc6!

1.Qe1? th. 2.Qg3#
1...Kf4 (direct guarding - B) 2.Sg6#
1...Sb5 (unpinning - C) 2.Rxf5#
1...Rc5!

1.Qh1! th. 2.Qxe4#
1...Kf4 (unpinning - C) 2.Sg6#
1...Sb5 (guarding by line opening - A) 2.Rxf5#

OM-32-23. Special forms of motives by bK moves.









#2 (10+10)
Zoltan Labai
3511 Sachove Umeni 5/1973
In 1st Album of Czechoslovak chess compositions 1972-1973

1.Kf2! th. 2.Sf3#
1...Bxd2 (capturing of threat piece - A) 2.gxh4#
1...Be4 (direct guarding - B) 2.Sxe4#
1...hxg3+ (checking - C) 2.Qxg3#
1...Rxe5 (providing flight by capture - D) 2.Rxg6#

1.Sd5! th. 2.Bf4#
1...Bxd2 (direct guarding - B) 2.gxh4#
1...Be4+ (checking - C) 2.Sxe4#
1...hxg3 (providing flight by capture - D) 2.Qxg3#
1...Rxe5 (capturing of threat piece - A) 2.Rxg6#

In 2nd solution the motive of hxg3 isn't entirely pure as it contains also unblocking.









#2 (11+9)
2 solutions
Ladislav Salai
3rd Prize CSSZ C 31.12.1973
In 1st Album of Czechoslovak chess compositions 1972-1973

1...S~ 2.Qh5#
1...Sc7! (unpinning - A) 2.h8Q# (Sf7?)
1...Se7! (direct guarding - B) 2.Sf7# (h8Q?)

1.Qa2? th. 2.Qxd5#
1...S~ 2.R,Qxe6#
1...Sc7! (direct guarding - B) 2.h8Q# (Sf7?)
1...Se7! (line closing - C) 2.Sf7# (h8Q?)
1...Kxe4!

1.Qd2! th. 2.Qxd5#
1...S~ 2.B,Qxd6#
1...Sc7! (line closing - C) 2.h8Q# (Sf7?)
1...Se7! (unpinning - A) 2.Sf7# (h8Q?)

Special form of themes with defence motives is possible when we consider defence motives of black corrections against secondary threat. In this form we have here theme OM-32-23. Although in try and solution we have in fact two secondary threats, author luckily found the way to make motives as uniform as possible.









#2 (12+8)
Zoltan Labai
5th Prize CSSZ C 31.12.1973
In 1st Album of Czechoslovak chess compositions 1972-1973

1.Qc8? th. 2.Qf5#, 1...Se6! (interposing - A)
1.Sb4? th. 2.Bd3#, 1...Sf2! (direct guarding - B)
1.Sf3? th. 2.Sd2#, 1...Bxf3! (capturing of threat piece - C)

1.Rf2! th. 2.Rf4#
1...Se6 (direct guarding - B) 2.Qxc6#
1...Sxf2 (capturing of threat piece - C) 2.Sc3#
1...Bf3 (interposing - A) 2.exf3#

Again unusual form, this time we have changed defence motives of 3 refutations comparing to defence motives of 3 defences in solution.









#2 (10+13)

Comments to Juraj Lörinc.
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