Hello gmi @simpaticheski,
Please after 20x49, its difficult to escape with the king possible capture (42-38). But After 20x47 you can move the king freely. Hope am right😀

Hi Tomekpe, surely 20x47 is a bit better, but it's not really relevant - if you check the evaluation scores of the engine Scan 3.1 after 20x47 it's even higher than after 20x49.

Yes you are correct. Thank you Gmi @simpaticheski

Puzzle 4262: 65. 39-6 is also winning, but is marked as a wrong move.