The Israeli Chess Composition Society (http://www.variantim.org/) has announced the 1st Israeli Open Composing Tourney, having two sections :
1. Section two-movers, dedicated to the memory of Yefim Rukhlis.
2. Section helpmate two-movers, dedicated to Jean Haymann on occasion of his 80's birthday
Announcement (Deadline 2013-05-31) : http://www.variantim.org/1st_israel_open_composition_tourney_b.pdf
Related articles :
(1) Two-mover Cycles: Why discriminate the mate?, by Paz Einat http://www.variantim.org/2x_theme_article.pdf
(2) Dynamic Square obstructions as a tool for dual avoidance in helpmates in 2 moves, by Shaul Shamir