Four simple questions for you this week.

Question 1: How can White force mate in 2 moves in this position?

Question 2: Move the white queen from f7 to g7: how can White force mate in 2 moves now?

Question 3: Now, with the queen still on g7, move the white pawn from a7 to e7: how can White force mate in 2 moves now?

Question 4: From the position in Question 3, move the white king from d4 to c4: how can White force mate in 2 moves now?

These problems were composed by Werner Speckmann (Neue Zürcher Zeitung, 5 May 1965).