7. Chess variants on special boards

Chess variants played on special shaped chessboards.

These include neither the hexagonal variants nor the grid based, nonrectangular variants.

Circular Chess

Circular ring shaped board

Singularity Chess

Lines bend and make U-turns around the center of the board

Infinity Chess

Infinity-symbol shaped board

Round Chess

Round board with chess-like structure, but the rook's and the queen's movement is different