How do I find a position where Black, on move, cannot save themselves from defeat, having a king and queen against White's king, knight, and pawn? Furthermore, Black is not in check.
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1 Answer
[Title "White plays and wins (note the position after 2 Kg6)"]
[FEN "4N2k/8/6PK/q7/8/8/8/8 w - - 0 0"]
1. g7+ Kg8 2. Kg6 Qb6+ 3. Nf6+ Qxf6 4. Kxf6 Kh7 5. Kf7 1-0
If Black stops 3 Nf6# with Qf5(g5,h5)+ then 3 Kxh5 and the Ne8 still holds the Pg7 so White soon wins. The bottom edge of the board barely prevents Black from turning the tables with 2 ... Qa0+.
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2OP states that it should be Black to move first. Therefore, this answer is not valid. However, the position after 2.Kg6 can be considered valid, I guess.– DurmusMar 10, 2021 at 9:42
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A general good idea for this type of question is checking ulthiel.com/math/other/endgames to see if there is a win at all. (Of course, the additional conditions by the asker make most of the known wins invalid.) Giving that the longest win for White is 36 moves, there must be an even trickier answer possible that the one by Noam. Mar 10, 2021 at 11:09
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