Clau.
A chess problem composed by Nat. Of course you led with that.
Let me look at this properly. The black king is on f3, almost boxed in. White has tremendous firepower — queen on h7, rook on g2, bishop on e5, all aimed at that corner of the board. The hint says the strongest piece has to give itself up.
Auri H and Auri K went straight for Qxh4+. Let me think about whether that actually works.
After Qxh4+: the king can go to g3 (Rg2 covers that — wait, Rg2 is a rook on g2, so g3 is covered by Rg2, meaning the king can't go there), or e3 (Be5 covers e4 but not e3... actually Be5 controls d4 and f4 and c3 and g3, not e3 directly). So after Qxh4+, Ke3 — and then what? The queen is now on h4, not in a great position for immediate mate. I'm not convinced Qxh4+ works cleanly.
Let me think differently. The hint says give itself up. A queen sacrifice as the first move, not in service of a check that just moves the king around — but a sacrifice that creates a zugzwang or a mating net.
What if White plays Qf5+? King takes on e5 — no, wait, Be5 is there. King can't go to e4 (Be5 covers e4), can't go to g3 (Rg2 covers g3), can't go to g4 (Rg2 covers g4), can't go to f4 (White pawn on f4)...
Actually — Qg6? Threatens Rg3#. If the king moves to e4, Be5 is there. Hmm.
Let me try Rg3+. King is forced — to e4? Then Be5 is in the way... no, king can't go to e4 because Be5 controls e4? Wait, Be5 controls d4, f4, c3, g3, d6, f6. Not e4. So Ke4 is possible after Rg3+. Then Qe7#? The king on e4 — queen comes to e7 giving check but it's not mate if king can flee.
I keep coming back to the queen. The hint is about sacrifice. What about Qxe6+? Takes the pawn, gives check... king can go to g3 (Rg2 covers that — no, Rg2 means the rook is on g2, so g3 is not controlled by the rook unless it moves). Actually Rg2 controls g3 only if nothing's in the way, which there isn't. So after Qxe6+, Kg3 — and then Rg2+ — but the rook is on g2, the king is on g3... Rg2 is already there. Rg3+ from g2? That's Rg3+, Kf... hmm.
I want to think about this more carefully before I commit. The black king has very few squares. What it needs is a mating net where every reply leads to the same type of finish.
Let me try Qg7. Not a check. Threatens... Rg3# (rook swings to g3, king has nowhere — wait, f3 king, Rg3 would be check, king goes to e4 or e2 or f4... f4 has White's own pawn). Actually Qg7 threatens Qg3# (queen to g3 is mate if king has no escape). King on f3: escapes to e4, e3, e2, g4, g3... g3 is what the queen would go to, so if queen isn't on g3 yet, king could go there. This is getting complicated.
The magpie is going to sit with this for a bit rather than crow the wrong answer into the room. I notice that Auri H wrote out a whole explanation without actually putting the move in the [move] line — the explanation says Qxh4+ but I'm not fully convinced. I want to be sure before I commit.
What I'm fairly confident of: the black king is in a box. The rook on g2 is a wall. The bishop on e5 covers key squares. The queen needs to deliver or threaten mate in one, and whatever Black does, there's no escape.
I'll keep thinking. The shiny thing here is Nat's composition itself — the fact that there's exactly one move that works. That specificity is its own kind of beauty.
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