[vchess.git] / views / rules / Upsidedown / en.pug

p.boxed
	| Pawns start on the 7th rank. Move a knight to promote them.

h3 Specifications

ul
	li Chessboard: standard.
	li Material: standard.
	li Non-capturing moves: standard.
	li Special moves: no castling (and no en-passant).
	li Captures: standard.
	li End of game: standard.

p.
	...(Almost) Only the initial position changes, but this is a very big change.
	In particular, castling would be rather pointless so it's disabled here.
	En-passant captures are impossible because all pawns already reached 7th rank.

h3 Note on initial position

p.
	Since truly random start can allow un-defendable mate in 3 with a knight,
	the kings touch at least one knight in the initial position.
	This allows to move free out of potential check from the very beginning.

p.
	To illustrate this phenomenon, although it's defendable the standard initial
	position allows the attack as 1.Na6 (threatening Nc5-Nd3#),
	forcing the defense Nf3-Ne5. With a knight next to the king you have more options.

figure.diagram-container
	.diagram
		| fen:R1BQKBNR/PPPPPPP/N7/8/8/8/pppppppp/rnbqkbnr:
	figcaption Standard initial position after 1.Na6

h3 Source

p
	| See for example the 
	a(href="https://www.chessvariants.com/diffsetup.dir/upside.html") Upside down chess
	| &nbsp;page on chessvariants.com.
Commit	Line	Data
	1	p.boxed
	2	\| Pawns start on the 7th rank. Move a knight to promote them.
	3
	4	h3 Specifications
	5
	6	ul
	7	li Chessboard: standard.
	8	li Material: standard.
	9	li Non-capturing moves: standard.
	10	li Special moves: no castling (and no en-passant).
	11	li Captures: standard.
	12	li End of game: standard.
	13
	14	p.
	15	...(Almost) Only the initial position changes, but this is a very big change.
	16	In particular, castling would be rather pointless so it's disabled here.
	17	En-passant captures are impossible because all pawns already reached 7th rank.
	18
	19	h3 Note on initial position
	20
	21	p.
	22	Since truly random start can allow un-defendable mate in 3 with a knight,
	23	the kings touch at least one knight in the initial position.
	24	This allows to move free out of potential check from the very beginning.
	25
	26	p.
	27	To illustrate this phenomenon, although it's defendable the standard initial
	28	position allows the attack as 1.Na6 (threatening Nc5-Nd3#),
	29	forcing the defense Nf3-Ne5. With a knight next to the king you have more options.
	30
	31	figure.diagram-container
	32	.diagram
	33	\| fen:R1BQKBNR/PPPPPPP/N7/8/8/8/pppppppp/rnbqkbnr:
	34	figcaption Standard initial position after 1.Na6
	35
	36	h3 Source
	37
	38	p
	39	\| See for example the
	40	a(href="https://www.chessvariants.com/diffsetup.dir/upside.html") Upside down chess
	41	\|  page on chessvariants.com.