Hostage chess

[1] Captured pieces are not eliminated from the game but can reenter active play through drops, similar to shogi.

In exchange, the player returns a previously captured enemy piece which the opponent may drop on a future turn.

Instead of making a normal move, a player can perform a hostage exchange to "rescue" a man held prisoner by the opponent and drop the freed man back into play on the board onto an open square.

On any turn, instead of making a normal move, a player can drop a man from his airfield into active play on the board.

A hostage exchange is performed by transferring a piece from one's prison to the opponent's airfield, then selecting and releasing a piece from the opponent's prison and immediately dropping it onto an empty square on the board.

A drop can occur as part of a hostage exchange, or directly from a player's airfield.

If the promoted piece is subsequently captured, it retains the type that it had when entering prison.

So, if a pawn is on its player's 7th rank with no available piece to promote to: According to David Pritchard:[4] Hostage Chess, for want of a better description, is a Chessgi variant.

And secondly it introduces additional skill elements that are difficult to evaluate, which in my view make the game much more interesting.Standard notation is used with some extensions: White: Frank Parr   Black: David Pritchard   Casual game[7][8] 1. d4 d5 2. c4 2... dxc4 3.

In the Fried Liver Attack (1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Nxd5 6.Nxf7 Kxf7 7.Qf3+ Ke6; see diagram), Black is okay in standard chess , but in hostage chess the line fails: White wins a knight with 8.Bxd5+, since if Black recaptures 8...Qxd5, White plays the hostage exchange 9.(N-B)B * f7+ (transferring the black knight in their prison to Black's airfield, then releasing the white bishop from Black's prison and dropping it on f7 with check) to win Black's queen.
Position after 19...(P-P) * d2+