At first glance there isn't much to see (KvK) but only because we are going to work backwards. Specifically White takes back their last move, then Black takes back their last move. Black then plays a different move, allowing White a mate in 1.
(Hint: Obviously we have undo a capture or two, otherwise we still won't have enough material to mate with)
2 comments:
I think there are multiple solutions, so I looked for the one with more pieces on the board and with the highest value.
I found three solutions with a white queen and two black rooks:
4rk2/8/4Q1K1/7r/8/8/8/8 w - - 0 1
4rk2/8/6K1/4Q2r/8/8/8/8 w - - 0 1
4rk2/3Q4/6K1/7r/8/8/8/8 w - - 0 1
In the last one, mate can be done in two different ways. Is it the winner?
White takes back Kg6xh5
Black takes back Rh1xh5
Black plays O-O
White plays Qh5-h7#
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