the.com/castling
the only chess move where two pieces conspire to flee at once
means In chess, a special move where the king and one rook move simultaneously, the king sliding two squares toward the rook and the rook hopping to the king's other side, used to tuck the king into safety.
from From 'castle,' the old informal name for the rook — the corner piece shaped like a fortress tower. 'Castle' traces back through Old French to Latin 'castellum,' a diminutive of 'castrum,' a fortified place or camp. The verb 'to castle' grew naturally from naming the move after the piece, with 'castling' as its gerund.
- royal swap
- king and rook move together in one turn
- no peeking through check
- king can't pass over an attacked square
- two flavors
- kingside short, queenside long, both legal
- once only
- forbidden if king or rook already moved
- medieval upgrade
- didn't exist in chess until the 1500s
fischer vs spassky 1972 — bobby fischer's kingside castle in game 6 of the world championship match in reykjavik
kasparov vs karpov 1985 — garry kasparov's queenside castle in game 16 of their world championship match in moscow