
This puzzle, by F. Abdurahmanovic, won first prize in a 1959 Yugoslav tourney. It’s a helpmate — how can Black, moving first, cooperate with White to get himself checkmated in two moves?
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1. Kf4 h8=N 2. Ke5 Ng6#.
Ingeniously, Abdurahmanovic now unveils a second puzzle: Play the first move of this solution, Kf4, and consider the resulting position as a new two-move helpmate.
And a third puzzle: Play the first move of that solution and again find a two-move helpmate.
And yet a fourth: Play the first move of that solution and find yet another two-move helpmate.
The solutions:
(after Kf4) 1. Kxg5 h8=B 2. Kh6 Be3#.
(after Kxg5) 1. Kxf6 h8=R 2. Kg7 Bd4#.
(after Kxf6) 1. Ke5 h8=Q# 2. Kxe4 Qd4#.
In all four solutions, White starts by promoting the pawn, and it promotes progressively to a knight, a bishop, a rook, and a queen!
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