Chess/Puzzles/Directmates/Two-move 1/Solution

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1. Qa2 Nc6

If 1... Kxa8 then 2. c8=Q#
If 1... Kc6 then 2. Qd5#

2. c8=Q#

a b c d e f g h
8 a8 b8 c8 d8 e8 f8 g8 h8 8
7 a7 b7 c7 d7 e7 f7 g7 h7 7
6 a6 b6 c6 d6 e6 f6 g6 h6 6
5 a5 b5 c5 d5 e5 f5 g5 h5 5
4 a4 b4 c4 d4 e4 f4 g4 h4 4
3 a3 b3 c3 d3 e3 f3 g3 h3 3
2 a2 b2 c2 d2 e2 f2 g2 h2 2
1 a1 b1 c1 d1 e1 f1 g1 h1 1
a b c d e f g h

[edit] Other attempts

The move 1. Qb3+ doesn't mate in two moves because of the line 1. Nb5 2. Qxb5+ Ka8 then 3. c8=Q# which is three moves.
Likewise 1. Qb8+ fails to Kc6 2. Qb6 Kxd7
And 1. c8=Q Nxc8 2. dxc8=8 Ka7 3. Qf7#
What if 1...Nc8?

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