| 1 | p.boxed |
| 2 | | You have two new pieces in a pocket, which can appear after any |
| 3 | | first piece movement. |
| 4 | |
| 5 | p. |
| 6 | When a piece is moved for the first time, it is possible to place a new |
| 7 | piece at its initial square. |
| 8 | You have two pieces that can enter the game like this: |
| 9 | ul |
| 10 | li The Hawk (H): moving like a bishop + knight. |
| 11 | li The Elephant (E): moving like a rook + knight. |
| 12 | |
| 13 | figure.diagram-container |
| 14 | .diagram |
| 15 | | fen:rnbqkbnr/pppppppp/8/8/8/2N5/PPPPPPPP/REBQKBNR: |
| 16 | figcaption. |
| 17 | Position after 1.Nc3/E. White moved his knight from b1 to c3 and placed |
| 18 | the elephant on b1. |
| 19 | |
| 20 | p. |
| 21 | After castling, a new piece can be put at the initial king square |
| 22 | (if not occupied), or at the initial rook square - but not both. |
| 23 | |
| 24 | p. |
| 25 | If a move let the king under check, then it is forbidden, |
| 26 | even if placing a pocket piece would have covered the check. |
| 27 | |
| 28 | h3 Source |
| 29 | |
| 30 | p |
| 31 | | Some explanations about the rules and a link to buy a physical S-Chess set |
| 32 | | on the |
| 33 | a(href="http://www.seirawanchess.com/") Seirawan Chess page |
| 34 | | . This variant is playable on |
| 35 | a(href="https://www.pychess.org/variant/seirawan") pychess-variants |
| 36 | | with an engine available for analysis. See also the |
| 37 | a(href="https://en.wikipedia.org/wiki/Seirawan_chess") Wikipedia page |
| 38 | | . |
| 39 | |
| 40 | p Inventors: Yasser Seirawan and Bruce Harper (2008) |