puzzle 840

After the 21-27 line you cant protect your king afterwards, resulting in an even position.

i don't think so but i have no longer the puzzle in front of my eyes
and i don't know how to choose them

it's ok,thanks you
the difference it's after 1. 21-27, and so on,he can take 16*27 instead of 23*32 because of 21-26.
and I didn't see 13-18 and 08-13 while white take 5*37

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