A play of two adjacent pawns from their initial game-array squares without capture to four squares available to them (single- and double-step).
The theme was proposed by Igor Agapov for the SuperProblem TT-77 (2013).
Note: In TT-77, due to the ambiguous initial definition, simplified forms of the theme were allowed, e.g., without single-step pawn moves.
Rice, Russell Ernest
Ideal-Mate Review, 1983
1st V. Archakov MT, 2006
Quick tourney, WCCC (Jesi), 2011 (v)
SuperProblem TT-77, 2013
1st Place (h#3)
SuperProblem TT-170, 2016