Mate in 7 — Problem #2997239
🎯 Checkmate in 7 — your move
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9
8
7
6
5
4
3
2
1
一
二
三
四
五
六
七
八
九
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Show solution
▲５二龍 △同 玉 ▲４一銀 △４二玉 ▲３二と △５一玉 ▲５二金
Why this move works
The answer is ▲５二龍 △同玉 ▲４一銀 △４二玉 ▲３二と △５一玉 ▲５二金. The key is the dragon sacrifice: letting the king capture on 5二 (△同玉) pulls it out, ▲４一銀 and ▲３二と drive it back to 5一, and ▲５二金 finishes with a head gold defended by the silver on 4一.
Giving up the dragon to herd the king to the narrow edge, then sealing its escape with the silver and the tokin, is the backbone — a textbook seven-move finish that uses a sacrifice to push the king onto a worse square.