With opposite coloured bishops the attacking side has in effect an extra piece in the shape of his bishop.
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 BotvinnikAbove all else, before playing in competitions a player must have regard to his health, for if he is suffering from ill-health he cannot hope for success. In this connection the best of all tonics is 15 to 20 days in the fresh air, in the country.
Mikhail Botvinnik