Botvinnik - Keres 18th World Championship 1948 White to move and win

The 18th World Chess Championship was round robin tournament played by five participants following the death of Alexander Alekhine in 1946. This was won by Mikhail Botvinnik.

Here is one of Botvinnik's win in the tournament. Find the winning combination for White.

Solution:
.
.
.
.
.

! 21. Rxg7+ Kxg7 22. Nh5+ Kg6 23. Qe3 or Qd2 is winning.

Full game here