Mitrofanov's Phoenix Puzzle

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DAILYWATERSITTING

IM pfren mentioned this puzzle but I can't find it anywhere on the net. Somebody knows something? Thank you.

DAILYWATERSITTING

Thank you so much mr. Pfren! Now I shall go and try to solve it...

DAILYWATERSITTING

Just incredible...both kings need to flee the promotion checks in order to survive...thank you again!