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Classic sum

Introduction

There are many hybrids of 3 most played chess variants (FIDE chess,

Xiang-qi and Shogi). Most of them are based on FIDE chess, with cannons

and palaces from Xiang-qi and/or dropping and promotion from Shogi. But,

besides simple mixing of different things of these games, there are also

many ways to play normal variants of all three games (or, at least, two)

at the same time! They are based on confrontation of related pieces (XQ

cannons are usually correspond with Shogi flying chariot and angle

walker; sometimes some piece from variants of FIDE chess added for

them). These are John Smith's "Chess Dial" and "Magic River", Charles

Gilman's "Easterhouse", Kuyan Judith's "Classic Average", or simple

throwing dice to determine, how pieces moves (better with 3 more games

added, it's usually Shantraj, Makrook and Shatar). Now, i decided to

make my own game, wich can join this list! If there are "Classic

Average", so there also must be "Classic Sum", where are pieces are

compounds of pieces from FIDE chess, Xiangi and Shogi (it's not as

simple, as it sounds)!

Setup

rnbqkqbnr -f-----a- ppppppppp --------- --------- --------- --------- PPPPPPPPP -A-----F- RNBQKQBNR P - pawn; K - king Q - queen; B - bishop; N - knight; R - rook; A - angle walker; F - flying chariot.

Rules

This game can be played on 9x10 Xiang-qi board (with normal palace and

river) and with Shogi pieces. Chess pawns promotion zone is last 2

ranks, but promotion zone of Shogi pieces is last 3 ranks. Shogi

promotion according to Shogi rules. There are destructive captures, when

captured piece is removed from game forever, but there are also passive

captures, captured pieces are moved to capturer's reserve and can be

dropped as in Shogi, almost all drops with demotion if captured piece is

promoted.

Ranks are numbered from 1 to 10, files are lettered from a to i. Rooks

are chariots and lances. Knights are horses. Bishops are elephants and

silver generals. Queens are advisors and gold generals. Left cannon is

flying chariot, right cannon is angle walker (there are no corresponding

pieces from FIDE chess). Initial setup is same as in Xiang-qi, BUT ranks

3 and 8 are filled with 9 pawns at each side and cannons are on ranks 2

and 9 (on same files, as in Xiang-qi), left cannon is angle walker.

Movement of pieces:

King:

as in Chess and Shogi. He may not leave his palace with orthogonal step

(but MAY with diagonal and with any step when in opponent's palace) and

without capture. When both king are inside thier own the paleces, they

cannot make orthogonal step if they are on same file and there is no any

piece between them or if this move will cause such situation. Can castle

with either rook by moving 2 steps towards them (rook leaps to next

square) under normal restriction, HOWEVER it CAN castle under or through

any check of flying chariot and angle walker and under check of pawn's

sideways move (see below). Don't promote. All captures are passive.

Queen (you may prefer call it ferz, as there are 2 of them):

as in Chess. May not leave friendly palace with single diagonal step

without passive capture (freely leaves opponent's palace). If in palace

and not making passive capture, cannot make single diagonal step if both

kings are inside thier own palaces and on seme file without any pieces

between them or if this move will cause such situation. Captures

passively if moves as gold general (single orthogonal step or single

forward diagonal step). Don't promote.

Bishop:

as in chess, plus can make single orthogonal step forward (thus, not

colorbound). When on friendly half of board, cannot make double diagonal

step to cross the river. When on friendly half of board, caonnot make

double diagonal step if both kings are inside thier own palaces and on

seme file without any pieces between them or if this move will cause

such situation. Captures passively if moves on step diagonal or

orthogonal forward. Promotes to queen in Shogi promotion zone when makes

single diagonal or forward orthogonal step.

Knight:

as in chess. Cannot move without leaping over orthogonaly or/and

promoting or/and passive capture if both kings are inside thier own

palaces and on seme file without any pieces between them or if this move

will cause such situation. Promotes (to queen and captures passively

when moving in direction of Shogi horse (two steps forward and one

sideways). When reaching last or last but one rank and captures

passively, promotion is obligatory.

Rook:

as in Chess and Xiang-qi. Cannot move at all expect castling and passive

capture or promotion if both kings are inside thier own palaces and on

seme file without any pieces between them or if this move will cause

such situation. Promotes (to queen) and captures passively when moving

forward (NOT sideways). When reaching last rank and captures passively,

promotiom is obligatory.

Flying chariot:

as rook, but can also leap over 1 piece of either side to capture.

Cannot move without passive capture or promotion if both kings are

inside thier own palaces and on seme file without any pieces between

them or if this move will cause such situation. Promotes and captures

passively when moving like rook. Promotes to dragon king: same, but can

also move one step diagonaly (capture is passive).

Angle waler:

as bishop (either move or capture) and cannon: without capture as rook

and captures along rook lines, but must leap over 1 piece. Cannot move

as cannon if both kings are

inside thier own palaces and on seme file without any pieces between

them or if this move will cause such situation. Promotes and captures

passively when moves as bishop. Promotes to dragon horse: same, but can

also capture with single orthogonal step (passively).

Pawn:

moves and captures with single orthogonal forward step, can also capture

diagonaly forward. On first move can make non-capturing double

orthogonal forward step, when can be captured en-passant diagonaly.

When crosses the river, can also move (capturing or not) one sideways

(cannot promote with this move at all). Cannot move one step orthogonaly

forward without capture and/or promotion and any sideways if both kings

are

inside thier own palaces and on seme file without any pieces between

them or if this move will cause such situation. Passive capture is only

orthogonaly forward. In Shogi promotion zone it promotes to queen only,

only when moving orthogonaly forward. Shogi promotion is only to queen

(demotes when captured). If captures orthogonaly forward with capturing

in Shogi promotion zone, uses only this promotion. In chess pawn

promotion zone promotes to queen, bishop, knight or rook (can be

promoted further) if moves orthogonaly forward without capturing or

diagonaly with capturing (and not demotes to pawn when captured). Chess

promotion is obligatory if moves diagonaly to last rank rank. Shogi

promotion is obligatory if moves with capturing to last rank. If moves

orthogonaly without capture to last rank,

promotion is optional (but further it can move only sideways).

Note that when bare facing conditiond apply, player cannot make

forbidden move even putting piece between kings.

Checkmate opponent's king to win.

Dropping restrictions: pawn cannot be dropped to checkmate

opponent's king ONLY if it check it with orthogonal forward move. Other

checkmates with pawn drops are allowed. Pawn and rook cannot be dropped

on last rank, knight cannot be dropped on last and last but one rank.

Stalemate rules are interesting: is stalemate draw or lose of stalemated

player, depends on last move.

For flying chariot and angle walker stalemate is alwys win.

For knight stalemate is draw when last move was NOT in Shogi knight's

direction and was made with leap over orthogonally adjecent piece,

otherewise, it's owner wins.

For bishop stalemate is win if last move was orthogonaly forward, one

step diagonaly or two steps diagonally on friendly half of board.

For queen stalemate is win if it moved like gold general or diagonaly

backward within friendly palace.

For pawn stalemate is draw if last move was diagonal capture or double

step, or chess promotion, otherwise it's win of it's owner.

For king and rook stalemate is always win, expect when last move was

castling.

Stalemate is win after any drop.

That's all rules! Hope, you liked it. If you found some mistakes (it was

hard to make game, where are pieces moves only like in these 3 games:

e.g. not making chess pawns promotion with Shogi moves), please, write

about it in comments. I am also planning to make a game, wich looks like

this, but without dull complicated rules.



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By Daniil Frolov.
Web page created: 2010-06-14. Web page last updated: 2010-06-14