Last week’s puzzle was from the game Alekhine – Maroczy (London 17 August 1922: a hundred years ago this week).

Black correctly continued 30… Qg3! 31. Nxb7 Bxg2! 32. Qxc6 Be4+, at which point his draw offer was accepted.

But Maroczy could have defeated the world champion had he played on with: 32… Be4+! 33. Kf1 Qh3+ 34. Kg1 (Kf2 lasts longer but is similar) 34… Rc8!, when he would either have won the queen or forced mate.

Congratulations to everyone who analysed this position correctly: especially those who hadn’t seen the position before and remembered the answer.

Here’s the complete game (click on any move for a pop-up window).