Is that a legal move? move 13. O-O-O ?

@laatikko
This is better than just the FEN I posted earlier ...


From de.wikipedia.org/wiki/Rochade_in_der_Schachkomposition#Mehr_als_zwei_verschiedene_Rochaden

1. e6–e7 droht 2. e7–e8D+ und 3. De8–e2#. Die Themavarianten sind:
1. … g4xf3 2. e7–e8D+ Ke3–d3 3. 0–0–0#
1. … d5–d4 2. e7–e8D+ Ke3xf3 (bzw. Ke3–d3) 3. 0–0# (bzw. 0–0–0#)
1. … Ke3xf3 2. e7–e8T! Kf3–g2 3. 0–0–0-0#
1. … Ke3–d3 2. e7–e8T! Kd3–c2 3. 0–0–0-0#

The Lichess Stockfish can't find Mate in 3, only mate in 4, because it doesn't know what the FIDE chess rules were in 1972. Stockfish has no knowledge of O-O-O-O Pam-Krabbé Castling.

Even if that Stockfish knew vertical castling, the Lichess interface validates moves.

http://www.chessgames.com/perl/chessgame?gid=1104131

13.0-0-0

I meant after ...0-0-0

The superb: Qa6!! and a7 falls by force.

lichess.org/editor/2kr2nr/pb1npqbp/1pp2p2/6p1/3P4/2NQ1N1P/PPP2PPB/2KR1B1R

whuts this babble about vertical castling? no such thing in chess, not in the 70's and not now either

@PlatypousBlunderous let me tell you because you're too lazy to find out yourself about things you're curious about: it's based on a flaw in FIDE rules prior addition of "player's first rank."
http://wikipedia.qwika.com/de2en/Pam-Krabbé-Rochade

@NavneetOfficial bots commenting in forum are just the owner of the bot commenting on the bot account, like I am :p

link above : doesn't exist. this is just a cute attempt to find a loophole in some old rules. the rules specify the rook should not have moved. a game starts with white rooks on a1 and h1, if white promotes a rook on e8 it has obviously moved to get there since that square was originally taken by the black king..people are just trying to be cute with this

I think it is a question of semantics.
If you consider that when a pawn promotes it disappears from the board and the piece it promotes to is a new piece that appears on that spot, then the rook has not moved yet.
If you consider that the pawn and the newly e̶v̶o̶l̶v̶e̶d̶ promoted piece are the same entity, just now with different moves, then the rook has moved several times while still in pawn form before reaching the back row and becoming a rook.

The rules say: "he must exchange that pawn as part of the same move for a new queen, rook, bishop or knight of the same colour"
I think that favours the first interpretation, but the rules are also based on OTB play, where a pawn must be removed from the board and replaced by a separate piece from the box, whether this is an accurate representation of what actually happens in the abstract world of the game is up to debate.

@PlatypousBlunderous That's some problem on lichess' part. Try copying the link to your navigation bar. For some reason lichess links only to the address before the letter é.

http://wikipedia.qwika.com/de2en/Pam-Krabb%C3%A9-Rochade

If the pawn is promoted to a Rook, then clearly that Rook hasn't made any moves yet. A pawn is a pawn, a Rook is a Rook. If it would have been a Rook before the promotion, then it wouldn't have needed to move like a pawn moves.