Grandmaster Akshat Chandra shows some World Chess Championship games where preparation swung the outcome of the match.
2025.06.03
Vladimir Kramnik vs Viswanathan Anand, Anand – Kramnik World Championship Match (2008): D49 Queen’s Gambit Declined semi-Slav, Meran, Blumenfeld variation
https://www.chessgames.com/perl/chessgame?gid=1510272
Vladimir Kramnik vs Viswanathan Anand, Anand – Kramnik World Championship Match (2008): D49 Queen’s Gambit Declined semi-Slav, Meran, Blumenfeld variation
https://www.chessgames.com/perl/chessgame?gid=1510508
Veselin Topalov vs Viswanathan Anand, Anand – Topalov World Championship Match (2010): D56 Queen’s Gambit Declined, Lasker defence
https://www.chessgames.com/perl/chessgame?gid=1582125