The question to be answered for all 6 puzzles
was: which move must White make to start a sequence of at most 6
moves against which Black will have no defence? In other words:
it is White's turn; what must he play to win with maximally6 moves?
The solution must be the shortest possible winning sequence.
Others things that mattered:
Read the complete rules
of the contest.
contest ran from October 7 to October 14.
Thanks to all the participants!