Selfmates 5

1st try:
1.c4? th. 2.Bc5+ bxc5 3.Sd5+ Kd3 4.Sb4+ Ke3 5.Sc2+ b,Bxc2#, 1...Bd3!

2nd try:
1.Bd6? th. 2.Qc3+ Sxc3#, 1...Qh8!

Additional try:
1.g7? th. 2.Bd6 etc., 1...Qh6!

Solution:
1.Rd8!! th. 2.Bd6 th. 3.Qc3+ Sxc3#, 2...Qh8 3.Rxh8 ~ 4.Qc3+ Sxc3#,
(1...Qh8 2.Rxh8 th. 3.Bd6, 2...Rh2 3.Rxh2 th. 4.Re2+ fxe2#, 3...f2 4.Rxf2 etc. or 3.Bc5+ bxc5 4.Rxh2 etc. - dual minor),
1...Qh6 2.c4! th. 3.Bc5+ bxc5 4.Sd5+ Kd3 5.Sb4+ Ke3 6.Sc2+ b,Bxc2#,
2...Bd3 3.Rxd3+! Kxd3 4.Qd4+! Kxd4 5.Sf5+ Kd3 6.Sxf2+ Sxf2#,
(1...Qh7 2.gxh7 ~ 3.Bd6 ~ 4.Qc3+ Sxc3#).

Play over whole board with spectacular rook and queen sacrifice in main variation and with nontrivial motivation for all movements. Genuine Gamnitzer!

1.Re7! zz
1...Ba8 2.Sc8 Bb7 3.Qb5+ axb5 4.Rc7+ Kxc7#
1...Bc8 2.Qg6+ Be6 3.Qe4+ Bd5 4.Rxa7! Bxe4#
(1...axb6 2.Qb5+ axb5 3.Rc7+ Kxc7#)

Royal battery mate expected, of course, but forced manoueuvre Bb7-c8-e6-d5-e4 was a bit unexpected for me. Clear position doesn't allow deeper strategy.

1.Qd7! th 2.Qd6+ Ke4 3.Qd3+ Ke5 4.Qe3+ PAxe3#
1...PAb1 2.Rb6+ Ke4 3.Rb4+ PAxb4 4.Qb7+ PAxb7#
1...PAc1 2.Rc6+ Ke4 3.Rc4+ PAxc4 4.Qc6+ PAxc6#
1...PAd1 2.Rd6+ Ke4 3.Rd4+ PAxd4 4.Qd5+ PAxd5#
1...PAg1 2.Sc6+ Ke4 3.Qe7+ Kd5 4.g8VA+ PAxg8#
1...Sg2 2.Qxf5+ Kd4 3.Re6+ Kc4 4.Re4+ PAxe4#
(1...PAf1 2.Qd6+ Ke4 3.Qxf4+ PAxf4#)

And now (as Monty Pythons use to say) something completely different: genuine Petkov. Rich play of batteries and 6 full-length variations in fourmove selfmate with a few fairy pieces. Very well done!

1.Qa6! zugzwang
1...Sc7 2.Qc6+ Sd5 3.c4 Kd4 4.Qc5+ Ke4 5.Sc3+ Sxc3#
1...Sd6 2.Bxd6 Kd5 3.Qa2+ Ke4 4.Rf4+ exf4 5.g4 f3#
1...Sf6 2.Bxf6 Kf5 3.Qc8+ Ke4 4.Rd4+ exd4 5.c4 d3#
1...Sg7 2.Qg6+ Sf5 3.g4 Kf4 4.Qg5+ Ke4 5.Sg3+ Sxg3#

Precise key and then two pairs of symmetrical variations.

1.Qd1+! Ka2 2.Qb3+ Ka1 3.Re1+ Rxe1 4.Kc2+ exd4 5.Rd1+ Rxd1 6.Qa4+ Bxa4#

All white pieces except king are sacrificed during six moves. Final position is hard to find, but that's all...