Change of defence motives with cyclic effects 2

1.Sxc5! th. 2.d4#
1...Sd5 (providing flight by closing white line - A) 2.Rxd5#
1...Bd3 (making threat impossible by closing line - B) 2.e8Q#
1...Sf3 (guarding - C) 2.Sg4#

1.hxg5! th. 2.f4#
1...Sd5 (guarding - C) 2.Rxd5#
1...Bd3 (providing flight by closing white line - A) 2.e8Q#
1...Sf3 (making threat impossible by closing line - B) 2.Sg4#

Making threat impossible by closing line is common motive of course, but it has the special flavour when it is applied to pawn move as pawn is very limited in movement.

1.Sc8? th. 2.S8e7#
1...Bd6 (direct guarding - A) 2.Qd4#
1...Be5 (unpinning - B) 2.Sb4#
1...Sc4 (Barulin defence - C) 2.dxc4#
1...Bg5!

1.Sb5! th. 2.Sc3#
1...Bd6 (Barulin defence - C) 2.Qd4#
1...Be5 (direct guarding - A) 2.Sb4#
1...Sc4 (unpinning - B) 2.dxc4#

Barulin defence, known also as a theme A, is in fact closing white line knowing that threat closes the other line to the same square and thus it would provide flight. It is special form of providing the flight by closing line and doing that in both phases has its own merit within Mlynka theme.

1.Bf8? th. 2.Sb4#
1...Sf5+ (checking - A) 2.Qxf5#
1...dxe3 (providing flight by capture - B) 2.Qxe3#
1...Rxb5 (guarding - C) 2.Qd7#
1...Re7!

1.Ke2! th. 2.Se3#
1...Sf5 (guarding - C) 2.Qxf5#
1...dxe3+ (checking - A) 2.Qxe3#
1...Rxb5 (providing flight by capture - B) 2.Qd7#

One of the most economical examples for Mlynka theme.

1.Rd1? th. 2.Rxd3#
1...f3 (unpinning - A) 2.Se3#
1...Be5 (guarding - B) 2.Sxb6#
1...Sd2 (making threat impossible by closing line - C) 2.Sxc3#
1...d2!

1.Re1! th. 2.Bxe4#
1...f3 (making threat impossible by closing line - C) 2.Se3#
1...Be5 (unpinning - A) 2.Sxb6#
1...Sd2 (guarding - B) 2.Sxc3#

I quite like the fact that all thematical defences are met by knight mates.

1.b8Q? th. 2.Qb5#
1...Bxc2+ (checking - A) 2.Rxc2#
1...Bb6 (making threat impossible by closing line - B) 2.Sxb6#
1...Sd6 (guarding - C) 2.Sxd6#
1...Bxc3 (providing flight - D) 2.Qc5#
1...d2!

1.Re1! th. 2.Bxe4#
1...Bxc2 (providing flight - D) 2.Rxc2#
1...Bb6+ (checking - A) 2.Sxb6#
1...Sd6 (making threat impossible by closing line - B) 2.Sxd6#
1...Bxc3 (guarding - C) 2.Qc5#

First example of OM-24-44 and very good problem in general.

1.Sd3? th. 2.Sc5#
1...Sd5 (unpinning - A) 2.Qxd5#
1...fxg6 (unblocking - B) 2.Qg8#
1...d6 (direct guarding - C) 2.Qc8#
1...Sf3 (guarding by opening line - D) 2.exf5#
1...Sc6!

1.Sh3! th. 2.Sg5#
1...Sd5 (guarding by opening line - D) 2.Qxd5#
1...fxg6 (unpinning - A) 2.Qg8#
1...d6 (unblocking - B) 2.Qc8#
1...Sf3 (direct guarding - C) 2.exf5#

This problem raised theoretical question about motivation duals - e.g. in solution 1...Sf4~ defends by opening bishop line, but some precised moves have also other defence motives. Only one is counted into OM-24-44, Sd5, others are not considered. But this depends on the concrete problem whether the flaw is serious or not. Better the problem is in general, more likely the motivation duals will not disturb anyone, including judge.