| 1 | p.boxed |
| 2 | | Columns 'a' and 'h' communicate. |
| 3 | |
| 4 | p. |
| 5 | Column 'a' is now just to the right of column 'h': a pawn on h2 can |
| 6 | take on a3, and a bishop on h3 can go to a4, and so on. |
| 7 | |
| 8 | p. |
| 9 | This allows a single piece to give a double check. On the following diagram |
| 10 | the bishop give check on b5 by two distinct paths: e2-d3-c4 and g2-h3-a4. |
| 11 | Covering both attacking lines is impossible so the king has to move. |
| 12 | |
| 13 | figure.diagram-container |
| 14 | .diagram.diag12 |
| 15 | | fen:8/2p5/3n4/1k6/8/8/2PP4/5B1K: |
| 16 | .diagram.diag22 |
| 17 | | fen:4k3/2p5/8/8/7N/8/3P4/7K a2,b3,b5,a6,g2,f3,f5,g6: |
| 18 | figcaption Left: double-check on b5. Right: possible knight moves from h4. |
| 19 | |
| 20 | h3 Source |
| 21 | |
| 22 | p |
| 23 | a(href="https://www.chessvariants.com/boardrules.dir/cylindrical.html") |
| 24 | | Cylinder Chess |
| 25 | | on chessvariants.com. |