Christmas carols and trees, all Ideal

Six compositions here by Nikos Pergialis. All helpmates with Ideal mates.
In the first composition our Last Rebetis (remember : Rebetico songs) writes his own carols.

Problem-640 Nikos Pergialis	Problem-640b Nikos Pergialis
8/4p3/4k3/8/4S3/4K3/8/3b1B2 (3 + 3) h#2, 2111	8/5p2/5k2/8/5S2/5K2/8/4b1B1 (3 + 3) h#2, 2111
1.Bh5 Kd4 2.Bf7 Bh3# 1.Ba4 Kf4 2.Bd7 Bc4# Symmetrical placement, symmetrical solution (Vertical mirror echo) with Ideal mates.	1.Βb4 Κg4 2.Βe7 Βd4# 1.Κg5 Βd4 2.Κh4 Βf6# Symmetrical placement, non symmetrical solution with Model mates.
Problems having symmetrical placements of pieces, with wide base, are called christmas trees. With this opportunity, Nikos Pergialis says carols with his unique way: Good evening Greeks, if you allow me, I want some news to announce in your splendid home. I will make an All-United Governement in Greece and inside my ministries I will have a lot of Swindlers. I will become Prime Minister, having all authorities, I will also give press conferencess, to say prattles. I will receive information updates from Liers with degrees and I will appoint Thieves where there is money. I will cut salaries, I will favor new houses. I will build Socialism, more than enough for all. I will give to everyone love and care and if your are short of bread, you can eat your Hopes. You will have - and you'll be proud - a Great Governor and if you ever see progress, let me know. It is exactly what you need, famous Greeks, because you are, as it seems, a sleeping Plebe. P.S.: Brothers, weeping is for us. I am too old now and I will say the bitter truth: I am not an exception. Nikos Pergialis, the Last Rebetis

Problem-641 Nikos Pergialis	Problem-641b Nikos Pergialis
4s3/8/3pKp2/4p3/4k3/3ppp2/4P3/8 (2 + 8) h#4, 2111...	4s3/3pKp2/8/4p3/4k3/3ppp2/4P3/8 (2 + 8) h#4, 2111...
1.Sg7+ Kxd6 2.f5 Kc5 3.f4 Kc4 4.Sf5 exd3# 1.Sc7+ Kxf6 2.d5 Kg5 3.d4 Kg4 4.Sd5 exf3# Ideal mates, with vertical mirror Echo and Selfblocks.	1.Sg7 Kd6 2.f5 Kc5 3.f4 Kc4 4.Sf5 exd3# 1.Sc7 Kf6 2.d5 Kg5 3.d4 Kg4 4.Sd5 exf3# Same idea, without checking key, but the mates are simply Model not Ideal.

Problem-642 Nikos Pergialis

2k5/4B3/K1P5/8/8/8/8/1r6 (3 + 2) h#2, 2111

1.Rd1 c7 2.Rd8 cxd8=Q# 1.Rb7 cxb7+ 2.Kb8 Bd6# Black sacrifices, Ideal mates. Listen you friends, chessfriends / and you committees in the world: / I do not bother for prizes and commendations, / I just take pleasure from the things I like.

Problem-643 Nikos Pergialis

5K2/3P4/r5bk/7p/8/8/8/8 (2 + 4) h#2, 2111

1.Bh7 d8=S 2.Rg6 Sf7# 1.Ra7 d8=Q 2.Rh7 Qd2# Ideal mates. Selfblocks, where bB and bR change places in the g6 and h7 squares.

Problem-644 Nikos Pergialis

8/8/8/s3k3/8/4SK2/4R3/8 (3 + 2) h#3, a) diagram 211111, b) wKf3 > b4

a) 1.Sc6 Rd2 2.Se7 Rd6 3.Sf5 Sc4# 1.Kd4 Rb2 2.Kc3 Ke4 3.Sc4 Sd1# b) 1.Sb3 Sg2+ 2.Kd5 Re6 3.Sd4 Sf4# Ideal mates. Eighteen moves of all pieces in different squares. The white Knight mates in different squares (Chameleon mates) guarding the Rook. And a verse for a friend : Such beauties are to be admired - when instructor is Harry Fougiaxis.

Problem-645 Nikos Pergialis

8/8/8/b7/2p1K3/8/1pP2k2/8 (2 + 4) h#7

1.b1=R c3 2.Rb4 cxb4 3.c3 b5 4.c2 b6 5.c1=R b7 6.Rf1 b8=Q 7.Be1 Qh2# Helpmate in seven with Ideal mate. It contains theme Excelsior (a pawn starts from its initial position and gets promoted) and Phoenix (promotion to a piece previously captured).