| 1 | p.boxed |
| 2 | | Pieces turn around the board, they cannot go in the middle. |
| 3 | |
| 4 | p. |
| 5 | Each side has only a king, two rooks, one bishop and two pawns. |
| 6 | Pieces can never enter the central area. |
| 7 | Pawns can only move "clockwise", acording to the image below: they move |
| 8 | and capture forward straight and diagonally in the arrow direction. |
| 9 | |
| 10 | figure |
| 11 | img.img-center(src="/variants/Rollerball/rollerball_directions.gif") |
| 12 | figcaption.text-center. |
| 13 | Main directions on the board. |
| 14 | The squares where direction changes are enlighted with white arrows. |
| 15 | |
| 16 | p. |
| 17 | When a pawn reaches the starting square of an enemy pawn, it promotes |
| 18 | into a bishop or rook. |
| 19 | |
| 20 | p. |
| 21 | Rooks and bishop move as usual, but are restricted to one square only when |
| 22 | moving counter-clockwise. |
| 23 | Moreover, they are allowed one rebound in certain circumstances: |
| 24 | ul |
| 25 | li a bishop rebounds on the first wall met, |
| 26 | li a rook rebounds (at 90 degrees) if it reaches a corner. |
| 27 | |
| 28 | figure |
| 29 | img.img-center(src="/variants/Rollerball/rook_example.gif") |
| 30 | figcaption.text-center Some rook movements. |
| 31 | |
| 32 | p. |
| 33 | The king moves as in orthodox chess. |
| 34 | The goal is either to bring your king on the initial square of the |
| 35 | opponent's king, or to checkmate him. |
| 36 | |
| 37 | h3 More information |
| 38 | |
| 39 | p |
| 40 | | See the |
| 41 | a(href="http://history.chess.free.fr/rollerball.htm") author's presentation |
| 42 | | , and the |
| 43 | a(href="https://www.chessvariants.com/40.dir/rollerball/index.html") |
| 44 | | chessvariants page |
| 45 | | . |
| 46 | |
| 47 | p Inventor: Jean-Louis Cazaux (1998) |