| 1 | p.boxed. |
| 2 | Capturing an enemy piece changes its color. |
| 3 | The converted piece must be moved immediatly. |
| 4 | |
| 5 | p. |
| 6 | Each capture transforms the captured piece into a friendly one |
| 7 | (changing color). Since it cannot remain on the capturing square, |
| 8 | it has to be moved immediately. This newly converted piece can now |
| 9 | capture (and thus "convert") another enemy piece, and so on. |
| 10 | |
| 11 | p. |
| 12 | Castling is impossible if any square traversed by the king is controlled |
| 13 | (directly or through a chain). Checks are ignored otherwise. |
| 14 | |
| 15 | figure.diagram-container |
| 16 | .diagram |
| 17 | | fen:qrk2r2/pp4pp/3pp2n/2pb1p1P/2BPPb1n/2B1N1N1/PPP2PPR/RQK5: |
| 18 | figcaption Black cannot castle because of the "check" Bxd5, Bxb7, Pxc8 |
| 19 | |
| 20 | p. |
| 21 | The goal is to convert the enemy king. Note that capturing a king is |
| 22 | possible only if a king move is then available. However, a piece gives |
| 23 | check (concerning castle) even if it's impossible. |
| 24 | |
| 25 | figure.diagram-container |
| 26 | .diagram |
| 27 | | fen:qrk2r2/pp4pp/3pp2n/2pb1p1P/2BPP2n/2B1b1N1/PPn2PPR/Rrqk4: |
| 28 | figcaption Black wins from the first diagram: Bxe3, Nxc2, Pxb1=R, Qxc1, Kd1 |
| 29 | |
| 30 | p If in a chain a converted piece cannot move, then you must reset the move. |