Rules of Crazyhouse (ZH)
All the rules and conventions of standard chess apply, with the addition of drops, as explained below.
A captured piece reverses color and goes to the capturing player's reserve, pocket or bank. At any time, instead of making a move with a piece on the board, a player can drop a piece from their reserve (a piece in there is considered 'held' or 'in hand') onto an empty square on the board. For example, a check that would result in checkmate in standard chess can be answered in Crazyhouse, if the defender can play a legal drop that blocks the check.
Drops resulting in immediate checkmate are permitted. This includes pawn drops.
Pawns may not be dropped on the players' 1st or 8th ranks.
Pawns that have been promoted and later captured are dropped as pawns.
A captured piece reverses color and goes to the capturing player's reserve, pocket or bank. At any time, instead of making a move with a piece on the board, a player can drop a piece from their reserve (a piece in there is considered 'held' or 'in hand') onto an empty square on the board. For example, a check that would result in checkmate in standard chess can be answered in Crazyhouse, if the defender can play a legal drop that blocks the check.
Drops resulting in immediate checkmate are permitted. This includes pawn drops.
Pawns may not be dropped on the players' 1st or 8th ranks.
Pawns that have been promoted and later captured are dropped as pawns.