White has now lost the attack, and is virtually on the defensive. He is
obliged to move his Queen, because Black threatens 21. ... B takes P,
discovering an attack upon the Queen with his Rook.
... 21. B to K 3
22. R takes R 22. R takes R
23. B to Kt 3 23. K to R 2
A good move, because White threatens, in case Black should exchange
Bishops, to win the Queen with either Kt to B 5: ch., P takes Kt; Kt takes
P: ch., K moves; Kt takes Q.