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Calculation of Piece Values 
. Link to an essay on attack values, material values, relative piece values.
Graphics: Empty chess boards. Images of empty chess boards.
The Symmetrical Chess Collection. Web site containing a collection of Chess Variants based on perfect symmetry.
Symmetrical Chess Collection. Collection of several large symmetric chess variants with only line pieces.
Symmetrical Chess Collection. Collection of several large symmetric chess variants with only line pieces.
Zag-Zag. Piece moves vertically or along ne-sw diagonal.
- Zag-Zig. Piece moves vertically or along nw-se diagonal.
- Zig-Zag. Piece moves horizontally or along ne-sw diagonal.
- Zig-Zig. Piece moves horizontally or along nw-se diagonal.
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