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

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

Diagram: ... threatens Nc5-Nd3# and allow 2.b8=Q

figure.diagram-container
	.diagram
		| fen::
	figcaption Standard initial position after 1.Na6

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.
	Here is an example:

// TODO: diagram
figure.diagram-container
	.diagram
		| fen:r7/2n5/1q6/5k2/8/8/K7/8:
	figcaption.
		The king cannot take on a8 because it's guarded by the knight: it's checkmate

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
dbcc32e9 BA	1	p.boxed
	2	\| Pawns start on the 7th rank. Move a knight to promote them.
	3
	4	Diagram: ... threatens Nc5-Nd3# and allow 2.b8=Q
	5
	6	figure.diagram-container
	7	.diagram
	8	\| fen::
	9	figcaption Standard initial position after 1.Na6
	10
	11	h3 Specifications
	12
	13	ul
	14	li Chessboard: standard.
	15	li Material: standard.
	16	li Non-capturing moves: standard.
	17	li Special moves: no castling (and no en-passant).
	18	li Captures: standard.
	19	li End of game: standard.
	20
	21	p.
	22	...(Almost) Only the initial position changes, but this is a very big change.
	23	In particular, castling would be rather pointless so it's disabled here.
	24	En-passant captures are impossible because all pawns already reached 7th rank.
	25
	26	h3 Note on initial position
	27
	28	p.
	29	Since truly random start can allow un-defendable mate in 3 with a knight,
	30	the kings touch at least one knight in the initial position.
	31	This allows to move free out of potential check from the very beginning.
	32	Here is an example:
	33
	34	// TODO: diagram
	35	figure.diagram-container
	36	.diagram
	37	\| fen:r7/2n5/1q6/5k2/8/8/K7/8:
	38	figcaption.
	39	The king cannot take on a8 because it's guarded by the knight: it's checkmate
	40
	41	h3 Source
	42
	43	p
	44	\| See for example the
	45	a(href="https://www.chessvariants.com/diffsetup.dir/upside.html") Upside down chess
	46	\|  page on chessvariants.com.