Blind nil意思

"Blind nil" is a term used in the card game Spades, where each player or team bids the number of tricks they believe they can take. A blind nil is a bid of zero tricks, made before the player has seen any of the cards in their hand. It is a risky bid, as the player is making a guess about their hand without looking at it, but it can be very rewarding if successful, as it scores double the number of points of a regular nil (a bid of zero tricks made after seeing one's hand). If a player fails to make a blind nil, they lose points instead.