In autumn 1923, at the age of twelve, Botvinnik was taught chess by a school friend of his older brother, using a home-made set, and instantly fell in love with the game. He finished in mid-table in the school championship, sought advice from another of his brother's friends, and concluded that for him it was better to think out "concrete concepts" and then derive general principles from these – and went on to beat his brother's friend quite easily. In winter 1924, Botvinnik won his school's championship, and exaggerated his age by three years in order to become a member of the Petrograd Chess Assembly – to which its president turned a blind eye. Botvinnik won his first two tournaments organized by the Assembly. Shortly afterwards, Nikolai Krylenko, a devoted chess player and leading member of the Soviet legal system who later organized Joseph Stalin's show trials, began building a huge nationwide chess organization, and the Assembly was replaced by a club in the city's Palace of Labor.