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 BotvinnikCapablanca's phenomenal move-searching algorithm in those early years, when he possessed a wonderful ability for calculating variations very rapidly, made him invincible.
Mikhail BotvinnikWhen my opponent's clock is going I discuss general considerations in an internal dialogue with myself. When my own clock is going I analyse conctrete variations.
Mikhail Botvinnik