If you are weak in the endgame, you must spend more time analysing studies; in your training games you must aim at transposing to endgames, which will help you to acquire the requisite experience.
Mikhail BotvinnikIf Tal sacrifices a piece, take it. If Petrosian sacrifices a piece, don't take it.
Mikhail BotvinnikChess is a part of culture and if a culture is declining then Chess too will decline
Mikhail BotvinnikChess is no whit inferior to the violin, and we have a large number of professional violinists
Mikhail Botvinnik