Mate in 3 — Problem #10
Black to move — find the mate
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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
▲４三銀上成 △５一玉 ▲５二金
Why this move works
The answer is ▲４三銀上成 △５一玉 ▲５二金. The key idea is promoting the silver so it moves like a gold. After the check the king runs to 5一, and ▲５二金 delivers a head gold.
The gold on 5二 is protected by the promoted silver on 4三, so it cannot be taken, and the king’s escapes (4一, 6一, 4二, 6二) are all covered. A good problem for learning to promote a piece to create the reach you need for mate.