From: "J. Andrew Lipscomb" <ewwa <at> CHATTANOOGA <dot> NET>
Date: 12 apr 2000
Subject: Re: Checkmate

There still obviously is a concept of checkmate in shogi--were there not, you
could not have the rule prohibiting a pawn-drop mate.

This question has a real effect.  If moving into check is not illegal, then if
you leave your king in check but then cover or escape the check before your
opponent notices, play on.  If it is illegal, it may still be possible to claim
the game.