2 | You have two new pieces in a pocket, which can appear after any
3 | first piece movement.
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:
10 li The Hawk (H): moving like a bishop + knight.
11 li The Elephant (E): moving like a rook + knight.
13 figure.diagram-container
15 | fen:rnbqkbnr/pppppppp/8/8/8/2N5/PPPPPPPP/REBQKBNR:
17 Position after 1.Nc3/E. White moved his knight from b1 to c3 and placed
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.
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.
31 | Some explanations about the rules and a link to buy a physical S-Chess set
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
40 p Inventors: Yasser Seirawan and Bruce Harper (2008)