Objective: Distinguish an illegal pawn-drop mate from a legal Pawn check or later mate.
Quick answer: Uchifuzume is the illegal act of dropping a Pawn that immediately checkmates the opposing King.
Best for: Beginners who understand ordinary drops and nifu but need the exceptional Pawn-drop mate rule.
In This Lesson
- The exact condition that makes a Pawn drop illegal.
- How to test captures, King moves, and defensive replies.
- Which similar mating ideas remain legal.
- How uchifuzume differs from nifu.
The Exact Test
A Pawn drop is uchifuzume only when all of the following are true: the move is a drop from hand, the dropped piece is a Pawn, that Pawn gives check, and the checked side has no legal reply. If the King can move, capture the Pawn, capture the protecting piece, interpose where possible, or answer the check in another legal way, the drop is not immediate mate and this rule does not prohibit it.
Interactive Illegal-Mate Example
In this constructed position, Sente has a Pawn in hand. A drop on 5b would check the King on 5a. The supporting pieces cover the capture and escape squares, so an immediate Pawn-drop mate is not a legal move.
A Legal Pawn Drop Check
A Pawn may be dropped to give check when the defender still has at least one legal reply. For example, if an escape square is open or the dropped Pawn can be captured safely, the move is a legal check rather than uchifuzume. The attacker may later deliver mate with another move.
Similar Mates That Are Legal
- Moving an existing Pawn to give checkmate is not a Pawn drop.
- Dropping a Gold, Silver, Rook, Bishop, Lance, or Knight to give immediate mate is not uchifuzume.
- Dropping a Pawn to give check is legal when the defender has a legal response.
- Dropping a Pawn that creates a future mating threat without giving immediate check is not a pawn-drop mate.
How to Verify the Position
- Confirm that nifu and dead-rank rules already permit the Pawn drop.
- Check whether the dropped Pawn directly attacks the King.
- List every legal King move.
- Test whether the King or another piece can capture the Pawn.
- Test every other legal answer to the check.
- If no answer exists, do not play the Pawn drop; find a different mating method.
Why Beginners Misread Uchifuzume
The word is often shortened in English to “pawn-drop mate,” which can sound as though every mating attack involving a dropped Pawn is illegal. The restriction is narrower: the Pawn drop itself must deliver immediate checkmate. It is also easy to stop after seeing that the King has no move, while missing a capture by another defender. Verify all legal replies, not only King escapes.
Use the Rule in Calculation
When a Pawn drop appears to mate, treat the illegality check as part of your candidate-move process. First confirm that the Pawn gives check. Then search for every defense. If there is no defense, remove that Pawn drop from your candidate list and examine a legal checking move, a non-Pawn mating drop, or a preparatory move that creates a later mate. The rule changes the legal move, not the underlying attacking idea.
Return to the complete rules guide, compare terminology in the Shogi Glossary, and verify candidate moves on the Practice Board.
Quick Check
Which move is prohibited specifically by the uchifuzume rule?
Uchifuzume applies only when a dropped Pawn itself gives immediate checkmate. The other examples are not prohibited by this specific rule.
References and Review
Rule details were checked against the Japan Shogi Association regulations in English and the FESA rules. Content reviewed July 24, 2026.