| 1 | p.boxed |
| 2 | | Pawns start on the 7th rank. Move a knight to promote them. |
| 3 | |
| 4 | Diagram: ... threatens Nc5-Nd3# and allow 2.b8=Q |
| 5 | |
| 6 | figure.diagram-container |
| 7 | .diagram |
| 8 | | fen:: |
| 9 | figcaption Standard initial position after 1.Na6 |
| 10 | |
| 11 | h3 Specifications |
| 12 | |
| 13 | ul |
| 14 | li Chessboard: standard. |
| 15 | li Material: standard. |
| 16 | li Non-capturing moves: standard. |
| 17 | li Special moves: no castling (and no en-passant). |
| 18 | li Captures: standard. |
| 19 | li End of game: standard. |
| 20 | |
| 21 | p. |
| 22 | ...(Almost) Only the initial position changes, but this is a very big change. |
| 23 | In particular, castling would be rather pointless so it's disabled here. |
| 24 | En-passant captures are impossible because all pawns already reached 7th rank. |
| 25 | |
| 26 | h3 Note on initial position |
| 27 | |
| 28 | p. |
| 29 | Since truly random start can allow un-defendable mate in 3 with a knight, |
| 30 | the kings touch at least one knight in the initial position. |
| 31 | This allows to move free out of potential check from the very beginning. |
| 32 | Here is an example: |
| 33 | |
| 34 | // TODO: diagram |
| 35 | figure.diagram-container |
| 36 | .diagram |
| 37 | | fen:r7/2n5/1q6/5k2/8/8/K7/8: |
| 38 | figcaption. |
| 39 | The king cannot take on a8 because it's guarded by the knight: it's checkmate |
| 40 | |
| 41 | h3 Source |
| 42 | |
| 43 | p |
| 44 | | See for example the |
| 45 | a(href="https://www.chessvariants.com/diffsetup.dir/upside.html") Upside down chess |
| 46 | | page on chessvariants.com. |