When do you know to play Alekhine's gun?

hitthepin
Retí’s Rifle (actually a real thing)
Gruber86
Re #40: levels got it wrong. The queen should be at the base of the 'gun' surely? Unless she realised her mistake and sorted it out later in the game ;)
ghost_of_pushwood
hitthepin wrote:
Retí’s Rifle (actually a real thing)

sure enough...

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