In this problem, we are given a position, and the task is to find the moves of a chess game that realizes the position in exactly the given number of moves.
The following problem, composed by Tibor Orban, and first published in Die Schwalbe, 1976 received a `commendation'. It looks simpler than it is. The position is actually quite easy to realize in 3.5 moves, i.e., after the fourth move of white, but the task is: This is the position after the 4th move of black. How did the game go?
There is a unique solution.