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White wins after Qd3! Qc1 Qa3 Kc4 b3 and taking the queen. The same idea if black plays Qa1 Qc3 and b3.
It’s not.
Why you’re asking?
White win after Qd3
It is the end of a study!
wKd6,Pa5,b2/bKc4,Pb5,b6,e4
8/8/1p1K4/Pp6/2k1p3/8/1P6/8 w – – 0 1
White wins.
The solution:
1. a6! e3
2. a7 e2
3. a8Q e1Q
4. Qd5+ Kb4
And here we reach the puzzle!
The key move here is
5. Qd3!, a wondruous quiet move!
The possibilities of Qa3+ Kc4 Qc3#
or Qc3+ Ka4 Qa3# restrain the choice of black moves. They must continue to control c3 or control a3 but 5… Qa1 is meeted by
6. Qc3+! Ka4
7. b3+
and 5… Qc1 by the echo variation
6. Qa3+! Kc4
7. b3+
of course, 5… Ka4 is short-lived because of 6. Qa3#
L. Kubbel, Leningradskaja Pravda, 1927.
PS: I’ve put the initial L. because he had a brother, Arvid Kubbel, who was also a study and problem composer.
PS2: The position after 5.Qd3! is a reciprocal zugzwang because if it is White to move again, they can’t win!