What's White's best move: 24.axb4, 24.Kb3, or 24.Qxb4?
Please check this!
Amazingly, the position after White's 19th move was home preparation by Botvinnik! This would be impressive in the computer age, let alone 1930.
P.S. Fritz 6 also finds this same line easily, which makes me think that this is an editorial snafu.