| 1 | p.boxed |
| 2 | | The capture of an enemy piece produces a new "checkered" piece belonging |
| 3 | | to both players. |
| 4 | |
| 5 | figure.showPieces.center-align |
| 6 | img(src="/images/tmp_checkered/cp.png") |
| 7 | img(src="/images/tmp_checkered/cr.png") |
| 8 | img(src="/images/tmp_checkered/cn.png") |
| 9 | img(src="/images/tmp_checkered/cb.png") |
| 10 | img(src="/images/tmp_checkered/cq.png") |
| 11 | img(src="/images/tmp_checkered/no_ck.png") |
| 12 | figcaption Checkered pieces, born after captures. |
| 13 | |
| 14 | h3 Specifications |
| 15 | |
| 16 | ul |
| 17 | li Chessboard: standard. |
| 18 | li Material: additional checkered pieces. |
| 19 | li Non-capturing moves: standard; see below. |
| 20 | li Special moves: standard; see below. |
| 21 | li Captures: standard; see below. |
| 22 | li End of game: standard. |
| 23 | |
| 24 | p The game potentially evolves in two stages. |
| 25 | |
| 26 | h2.stageDelimiter Stage 1 |
| 27 | |
| 28 | h3 Basics |
| 29 | |
| 30 | ol |
| 31 | li |
| 32 | | Each capture produces a new piece, taking on nature of |
| 33 | | the capturing or captured one. |
| 34 | li |
| 35 | | The new piece arising from a capture has a new color: |
| 36 | | "checkered", as illustrated above. |
| 37 | li |
| 38 | | All checkered pieces belong to the player in turn and can |
| 39 | | capture the opponents pieces. |
| 40 | |
| 41 | span Remarks: |
| 42 | ul |
| 43 | li A checkered move cannot be "undone" right after if this repeat the position. |
| 44 | li Checkered pieces cannot be captured. |
| 45 | |
| 46 | figure.diagram-container |
| 47 | .diagram |
| 48 | | fen:2kr4/pp6/2p5/4ss1r/1P2ns1P/2Np4/P1P1P1BP/R2o1RK1: |
| 49 | figcaption. |
| 50 | Black plays Rxh4=P. (Checkered pawn to) h5 is allowed then, |
| 51 | because piece's nature changed. |
| 52 | |
| 53 | h3 Pawn moves |
| 54 | |
| 55 | ul |
| 56 | li. |
| 57 | Pawns can jump two squares only from their initial rank, and only once in the game: |
| 58 | a checkered pawn returning on the pawns' start rank cannot jump. However: |
| 59 | li. |
| 60 | A pawn captured on its starting square (thus becoming "checkered") keeps the |
| 61 | right to advance two squares. |
| 62 | li. |
| 63 | Checkered pawns cannot capture en passant, because while the pawn was "passing" |
| 64 | they were of the same color. |
| 65 | |
| 66 | h2.stageDelimiter Stage 2 |
| 67 | |
| 68 | p.warn This stage is not (and probably will never be) implemented. |
| 69 | |
| 70 | p. |
| 71 | During the game one of the two players can decide to take control of the |
| 72 | checkered pieces. |
| 73 | They thus become autonomous and vulnerable to being captured - stage 2 begins. |
| 74 | The other player is in charge of both the white and black pieces, and tries to |
| 75 | eliminate checkered pieces. |
| 76 | The checkered side wins by checkmating either the white or black king. |
| 77 | |
| 78 | h4 Variant of stage 2 |
| 79 | p. |
| 80 | An observer could decide to join the game by taking the checkered pieces |
| 81 | at any moment. |
| 82 | It then becomes a chess game with three players, with some subtelties to be resolved. |
| 83 | It was tested in some (real life) games organised by the variant creator. |
| 84 | |
| 85 | h3 Special moves |
| 86 | |
| 87 | span Checkered pawns can... |
| 88 | ul |
| 89 | li move and capture in either direction; |
| 90 | li take en passant, |
| 91 | li be promoted on either the first or eighth row. |
| 92 | |
| 93 | h3 Credits |
| 94 | |
| 95 | ul |
| 96 | li. |
| 97 | The rules of Checkered Chess were thought up by Patrick Bernier and developed |
| 98 | with the help of Benjamin Auder. |
| 99 | li. |
| 100 | Thanks also to Olive Martin, Christian Poisson, Bevis Martin, Laurent Nouhaud |
| 101 | and Frédéric Fradet. |