Buoyant Rook

In shogi, Buoyant Rook (浮き浮き飛車 or ウキウキ飛車 ukiukibisha) or the Deceiver (目くらまし me kuramashi or 浮き飛車目くらまし ukibisha me kuramashi) is a surprise Static Rook opening in which the player's rook is advanced to the file directly above their line of pawns (rank 6 for Black or rank 4 for White) behind an advanced rook pawn.[1]

Once positioned on this rank, the player threatens to capture with their rook any pawns that are advanced by their opponent.

The term float (浮く uku) is used to refer to the positioning of the rook on rank 6 or 4 where it is undefended. A rook in this position is known as a floating rook (浮き飛車 ukibisha) as in, for instance, the Double Wing Attack Floating Rook opening (相掛かり浮き飛車 aigakari ukibisha). The word 浮き浮き ukiuki means light-hearted or cheery as if metaphorically floating.