| 1 | p.boxed |
| 2 | | Move twice at every turn. |
| 3 | |
| 4 | h3 Specifications |
| 5 | |
| 6 | ul |
| 7 | li Chessboard: standard. |
| 8 | li Material: standard. |
| 9 | li Non-capturing moves: standard. |
| 10 | li Special moves: standard. |
| 11 | li Captures: standard. |
| 12 | li End of game: standard. |
| 13 | |
| 14 | p. |
| 15 | The only difference with orthodox chess is the double-move rule, |
| 16 | but this affects the game a lot. |
| 17 | |
| 18 | h3 Basics |
| 19 | |
| 20 | p. |
| 21 | At the very first move of the game, white make only one move - as usual. |
| 22 | However, after that and for all the game each side must play twice at |
| 23 | every turn. There are two exceptions: |
| 24 | |
| 25 | ul |
| 26 | li. |
| 27 | If the first move gives check (maybe checkmate), |
| 28 | then a second move isn't played. |
| 29 | li. |
| 30 | If no move is available after the first move, then it's stalemate |
| 31 | and again, there is no second move. |
| 32 | |
| 33 | p. |
| 34 | About the PGN game notation: when a side plays two moves in a row, |
| 35 | they are separated (in order) by a comma in the PGN. |
| 36 | Example: 3.Na5,Bd3 e6,f4 (the two first are white moves, |
| 37 | the two others are black moves). |
| 38 | |
| 39 | figure.diagram-container |
| 40 | .diagram |
| 41 | | fen:r1bqkbnr/pppp1p1p/2n5/4p2p/4P3/5N2/PPPP1PPP/RNB1KB1R: |
| 42 | figcaption After the moves 1.e4 e5,Nc6 2.Qh5,Nf3 g6,gxh5 |
| 43 | |
| 44 | h3 En-passant capture |
| 45 | |
| 46 | p. |
| 47 | Capturing en-passant is allowed under certain conditions. |
| 48 | If the opponent moved a pawn allowing such a capture (once or twice), |
| 49 | then (to take it) you must capture en-passant at the first move of your turn. |
| 50 | After that, if (and only if) there is another en-passant capture available |
| 51 | you can play it on the second move. |
| 52 | |
| 53 | p. |
| 54 | Note: if a pawn 2-squares jump was made and then a piece landed at the |
| 55 | en-passant square at the second move, a pawn capture on this square |
| 56 | takes only the piece. |
| 57 | And, if a pawn advanced twice then en-passant capture |
| 58 | on its first movement is impossible (the pawn is now "too far"). |
| 59 | |
| 60 | h3 More information |
| 61 | |
| 62 | p |
| 63 | | See for example the |
| 64 | a(href="https://www.chessvariants.com/multimove.dir/marseill.html") |
| 65 | | Marseillais Chess |
| 66 | | page on chessvariants.com. |