## Thursday, November 13, 2014

### Two miniatures by two friends

A problem with a total of up to 7 pieces is a Miniature.

In today's post we will see a direct two-mover by Nikos Pergialis and a helpmate five-mover by Emmanuel Manolas.

 Problem-773 Nikos Pergialis, GR original 8/8/8/8/3K4/p3S3/s2kp3/Q7 (3 + 4) #2 Tries : {1.Qe1+? / Qxa2+? K(x)e1!}, {1.Qc3+? Sxc3!}, {1.Sc4+? Kc2!} Key : 1.Qb1! [2.Sc4#] 1...Sc1 2.Qb4# 1...e1=Q / e1=R 2.Qc2# 1...e1=S 2.Qd1# 1...e1=B 2.Qd1# / Qc2# In this miniature we see Dual Avoidance in the black answers 1...e1=Q / T and 1...e1=S where, while White can play 2.Qc2 or 2.Qd1 to mate, the black promoted piece inhibits the one of the two white moves. The promotion to black Bishop is not a good black answer. Also, we see Anti-reversal-Menace. The move 1.Qb1 threatens 2.Sc4#, but the move 1.Sc4 is not threating 2.Qb1#. The Theme Ropke is present : Two black defences from promotion of a specific pawn to same square are followed by two different white moves. The Theme Option is present : The key, and at least two tries with different defences, are played with the same piece.

 Problem-774 Emmanuel Manolas, GR original 3b4/K7/3k1r2/4s3/4b3/8/4P3/8 (2 + 5) h#5 a) Diagram, b) wKa7 to g7 a) Diagram 1.Bb7 e4 2.Sd7 e5+ 3.Kc7 e6 4.Bc8 e7 5.Rc6 e8=S# b) wKa7 to g7 1.Bc6 e4 2.Sf7 e5+ 3.Ke7 e6 4.Bd7 exf7 5.Re6 f8=Q# In both solutions the wPe2 starts from its initial position and in the fifth move it gets promoted (to a different piece in each solution) and delivers mate. The course of the pawn is the Theme Excelsior. The mate is done with self-block (even with sacrifice) of black pieces. White moves only his pawn. The kind of piece that Black moves is the same in the corresponding moves of the two solutions. Black moves white-squared Bishop, Knight, King, white-squared Bishop, Rook.