Change of defence motives with cyclic effects 3

a) 1.Rxe3! th. 2.Rd6#
1...Qa1+ (checking - A) 2.Qxa1#
1...Qxf3 (pinning - B) 2.Qa1#
1...Rxd8 (guarding - C) 2.exd8Q#

b) 1.Bd6! th. 2.Rf4#
1...Qa1 (pinning - B) 2.Qxa1#
1...Qxf3 (guarding - C) 2.Qa1#
1...Rxd8+ (checking - A) 2.exd8Q#

c) 1.Rd7! th. 2.Be5#
1...Qa1 (guarding - C) 2.Qxa1#
1...Qxf3+ (checking - A) 2.Qxf3#
1...Rxd8 (pinning - B) 2.exd8Q#

OM-33-33 (total cyclic change of 3 motives) in not very successful construction - flight-taking keys, twinning by moving two pieces... pioneer problem... Repetition of the same mate in two variations isn't lucky too. Fortunately (?) at least in last phase all mates are different.

1.Qd1? th. 2.Rf3#
1...Qc8+ (checking - A) 2.Sxc8#
1...Qxc4 (pinning - B) 2.Sxc4#
1...Rxg3 (direct guarding - C) 2.Rxg3#
1...Qb7!

1.Rff1? th. 2.Sf5#
1...Qc8 (direct guarding - C) 2.Sxc8#
1...Qxc4+ (checking - A) 2.Sxc4#
1...Rxg3 (pinning - B) 2.Rxg3#
1...Qb7!

1.Se6! th. 2.Qd4#
1...Qc8 (pinning - B) 2.Sxc8#
1...Qxc4 (direct guarding - C) 2.Sxc4#
1...Rxg3+ (checking - A) 2.Rxg3#

OM-33-33 with 3 white knights and cyclic creation of threats - Q, R, S prepare mate by R, S, Q and thus we get cycling of checking and pinning almost for free, only mating squares must be arranged in order to provide direct guarding in remaining variation. Good idea and although author allowed himself to put 3rd white knight on board, construction seems to be more satisfying than that of previous problem.

1.Bxd4! th. 2.Re3#
1...Sxd3 (capturing of threat piece - A) 2.Qe2#
1...fxe6 (providing flight by capture - B) 2.Rxe6#
1...Sxg4 (guarding - C) 2.Bxd5#

1.hxg6! th. 2.Qf5#
1...Sxd3 (providing flight by capture - B) 2.Qe2#
1...fxe6 (guarding - C) 2.Rxe6#
1...Sxg4 (capturing of threat piece - A) 2.Bxd5#

1.Rxb6! th. 2.Sxc5#
1...Sxd3 (guarding - C) 2.Qe2#
1...fxe6 (capturing of threat piece - A) 2.Rxe6#
1...Sxg4 (providing flight by capture - B) 2.Bxd5#

This example has original (for its time) combination of defence motives as well as form, the purity of motivation is excellent. Only the construction is arguable - but the mechanism works perfectly. OM-33-33.

1.d6? th. 2.Sd5#
1...Rd2 (guarding - A) 2.Bg3#
1...Bd4 (unpinning - B) 2.Rg4#
1...c6!

1.Bf5? th. 2.Rxe4#
1...Rd2 (unpinning - B) 2.Bg3#
1...Bd4 (making threat impossible by line closing - C) 2.Rg4#
1...Sg5!

1.Sf5! th. 2.Qxe3#
1...Rd2 (making threat impossible by line closing - C) 2.Bg3#
1...Bd4 (guarding - A) 2.Rg4#

Super presentation of theme OM-32-23 with absolutely pure motivation and precisely determined defences, good economy and nice construction. Karol Mlynka in his comment emphasizes very well chosen locus of threat squares and also unified harmful motivation. This problem illustrates that simple cycle isn't enough for artistic impression, whole problem must be of highest quality to reach hearts of many chess composition enthusiasists.

1.Rf4? th. 2.Re4#
1...Rf3 (pinning - A) 2.Sxf3#
1...Qc6 (providing flight by line closing - B) 2.Sc4#
1...Re3!

1.Kxg6? th. 2.Rf5#
1...Rf3 (guarding - C) 2.Sxf3#
1...Qc6 (pinning - A) 2.Sc4#
1...Se3!

1.Qa8! th. 2.Qe8#
1...Rf3 (providing flight by line closing - B) 2.Sxf3#
1...Qc6 (guarding - C) 2.Sc4#

Good example of OM-32-23 (known also as Brabec theme due to preceding problem) too, only the differences in form of motive B are a bit disturbing as in 1.Rf4? try it has the form of Barulin defence (theme A).

1.Rg4? th. 2.Q,Rd4#
1...Sg5+ (checking - A) 2.Rxg5#
1...Qxc3 (guarding - B) 2.Sxc3#
1...Sc2!

1.Kf6? th. 2.Se7#
1...Qxc3+ (checking - A) 2.Sxc3#
1...Bxd6 (guarding - B) 2.Qe4#
1...Bc4!

1.Ke7? th. 2.Qe4#
1...Bxd6+ (checking - A) 2.Qxd6#
1...Sg5 (guarding - B) 2.Rxg5#

Prototype of OM-32-32, it has also the change of mate after 1...Bxd6 and furthermore threat paradox (Bxd6 allows Qe4# in 2nd try while it defends this mate in solution). Not entirely satisfying but nevertheless interesting example for this special cyclic dependence of defences and their motives.