This system was so effective that it earned the endorsement of World Champions. and Vladimir Kramnik both provided forewords for later editions, with Carlsen noting it occupies a "very special place" in chess literature. The "Dvoretsky Torture"
designed to push a player's calculation to its absolute limit. Mark-Dvoretsky—Dvoretskys-Endgame-Manual
: Corrections to positions that had baffled human analysts for decades. This system was so effective that it earned