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  1. Bd5

Bd5 threatening Rxf8 mate. If Rxf2 then Qg8 mate.

Here's the final standings of the tournament. Three players tied for first including Euwe and Thomas above while current world champion Botvinnik placed fifth.

image.png

  1. Bd5 !! (Another moves with the bishop like Bb3 or Be6 don't work cause auf ... Qxg2)
 last year  

Yes, not really difficult to find, but rather nice. :)