White to move. Can you help Botvinnik find the winning continuation? 
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1.Bb4 and after the rather futile 1…c5 2.Bxc5 White wins with Rg8.
Hi Susan
1. Bb4 the White threatens 2. Rg8 and 3. Qe7# mate , c5
2. Bxc5, Bc6
3. Rg8, Kd7 [ if 3. …, Qxg8 4. Qe7# mate]
4. Rxa8 with large advantage and with idea of 5. Rf8 with a very strong attack
Good day
I too saw Bb4 as winning move.