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coordinates in/on board too
So, what if ...1 Kh1?
6.Qd1+ ... is also mate, but the program won't allow you to play it.
pawn not take queen ?
After 1.Qg3 + ....
1....Kh1 only gets mated more quickly, allowing mate in 4.
What happens after: 1... Kh1 ?
An alternative possibility. 1.Qg3+ Kh1 2.Ka2 a3 3.Qf2 a4 4.Qf1# 1-0
Move #6 could also be qd1mate, even though the computer indicates its the wrong move.
This outcome shoulda been stalemate had black hid behind the pawn at all costs.
Nice puzzle once you see the first move...
6.Dd1# est parfaitement valable n'en déplaise au système. L'idée sur 1.Dg3+ Rh1!? 2. Ra2 a3 3.Df2! a4 4.Df1#