カテゴリ4

　These chess variants change one of the general rules of chess, such as the objective of the game.

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　Different king

• Knightmate

　Checkmate the knight – the kings are regular, capturable pieces

• Coregal Chess

　Queens are also subject to check and checkmate

• Dual Chess

　Two kings, winning by checkmating any of them

• Weak Dual Chess

　Two kings, winning by defeating both

• Royalty Transfer Chess

　Two kings, only one is active at any time

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　Different objective

• Suicide Chess

　Capturing is compulsory, the player who loses all pieces wins

• Capture all!

　No check or checkmate – players win by capturing all opposing pieces

• Extinction Chess

　Players win by capturing all opposing pieces of a particular type.

• Dunsany's Chess

　White has lots of pawns against Black's usual set

• Pawns-Only Chess

　Pawns only, and the first promotion wins

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　Modified movement-rules

• Cylinder Chess

　The left and right sides of the board are joined, as if the game was played on a cylinder

• Bouncing Chess

　The bishop and the queen bounce off from the left and the right sides of the board.

• Bouncing Chess II.

　The bishop and the queen bounce off from the four edges of the board

• Berolina Chess

　Pawns move diagonally and capture orthogonally forwards

• Berolina Chess II.

　Pawns move diagonally and capture orthogonally forwards or sideways.

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　Multimove variants

• Double-move Chess

　Players move twice per turn

• Double-move Pawn Chess

　Double-move Chess with only pawns and kings.

• Monster Chess

　White has only king and some pawns, but moves twice per turn

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