Good old times 10

1.GId4! zz
1...CAh~ 2.g8CA#
1...CAg8! 2.fxg8CA#
1...GI4~ 2.f8S#
1...GIf8! 2.gxf8S#
1...GI7~ 2.a8CA#
1...GIa8! 2.bxa8CA#
1...CAc~ 2.b8S#
1...CAb8! 2.axb8S#

The mechanism for the black correction is a fairly simple one. Any move of black leaper unguards promotion square, leading to mating promotion. The move to promotion square corrects, but allows the same checkmate after capture by the other pawn. The scheme is symmetric and thus show the same content twice.

1.LIh1! zz
1...LId2~, f4, R~ 2.Sg5#
1...LIg2! 2.exf5#
1...Sb5~ 2.exf5#
1...Sd6! 2.Re7#
1...MAc6~ 2.Rxe7#
1...MAd8! 2.Sf8#
1...LIb8~ 2.Sf8#
1...LIbf4! 2.Sg5#
1...f~ 2.Rf6#

Cycle of mates after random moves and corrections of four different pieces: LId2, Sb5, MAc6 and LIb8. In other words it is 4-fold cyclic Feldmann 1 theme. The motivation of play is based on guard of g5 by Black, of d5 by White, of e7 by Black and of f8 by Black.

1.Kh5! th. 2.Rg4#
1...Ng2~ 2.Gd4#
1...Nc4! 2.Sd5#
1...Ne3! 2.Gg3#
1...Ge6~ 2.Gc7#
1...Gb6! 2.Qh6#
1...Gxe4! 2.Qxe4#
1...Qe2+ 2.Sxe2#

Both random defences show theme B (opening of white line allowing closing of other white line in mating move) and both of them allow two different corrections each. 1...Nc4! and 1...Gb6! also both close black lines resulting in unguards, other motifs are different. But the overall content is rather rich.

1.Rd5! th. 2.Re5#
1...VAf5~ 2.Sf6#
1...VAxd7! 2.PAa4#
1...PAd4~ 2.Sc5#
1...PAxd7! 2.VAh7#

Only two corrections, but they have quite original motivation (for 1983). Capturing black vao/pao blocks the possible square for jump of the other Chinese piece.

Compare this e.g. to #2 with Chinese pieces and hoppers that have found it 's way to FIDE Album 2001-2003 as G81.

1.Bc1! zz
1...MAe6~ 2.Rd4#
1...MAc5! 2.Sc3#
1...LIc7~ 2.Sc3#
1...LIg7! 2.MAhxf6#
1...MAhf8 2.MAhxf6#
1...MAg5! 2.MAg3#
1...LIg8~ 2.MAg3#
1...LIxd5! 2.Re2#
1...LIb5~ 2.Re2#
1...LIe5! 2.Rd4#
(1...LIbg5+! 2.Mg3#)

Cycle of mates after random moves and corrections of five different pieces: MAe6, LIc7, MAh7, LIg8 and LIb5. In other words it is 5-fold cyclic Feldmann 1 theme, thematically improving the 4-fold cycle.

The motivation of play is based on black guards of d4, c3, f6 and g3 and on blocking/guarding of potential flight d5. It is worth noting that Black uses only five fairy pieces and all of them are thematical.

1.Se6! th. 2.Sh4#
1...VA~ 2.Sfd4#
1...VAd5! 2.Qxb1#
1...VAc6! 2.Sed4#
1...PAe~ 2.Sed4#
1...PAed5! 2.VAc2#
(1...PAd4 2.VAd7#
1...bxa6+ 2.Qxe5#
1...Bxe7 2.Sg7#)

Again only two black fairy pieces correct their random moves.

After the key, f6 is guarded by both PAa6 and VAa1, that is why 2.Sed4+ is not mate (both lines are deactivated by the move). Similarly, g4 is guarded by both PAc4 and VAd1, that is why 2.Sfd4+ is not mate. Random moves deactivate lines through d4, but that means knights can leave their lines and go to d4. This is a specific form of Levman defences.

Corrections are based on the antibattery activation of PAd7 to d4. But 1...VAd5 pins both VAd5 and PAe5 in advance, allowing 2.Qxb1#, and 1...PAd5 blocks VAe4, making possible mate over immobilized hurdle. Both mates after corrections are unified by being given on the same diagonal.