An elegant 3-variation combination - puzzles and game (~1900 ELO, one of my best)
In this game i perhaps did the best pieces of calculation in my humble chess career, except for that 14-ply variation that unfortunately had a flaw. Anyways, have some puzzles!
First I want you to find the key move of the game yourself in the first puzzle. Then you can calculate the 3 critical variations. At the end, you can take a look at the whole game with my annotations.
White to move and win (could take a few minutes):
(don't be confused by Black's best defense, the critical variations will be in the puzzles below):
And here is the whole game with my annotations (there are some more details before and after the sacrifice, i hope ^^):