A Babson task is a direct-mate chess problem with the following properties:
1. White has only one key, or first move, that forces checkmate in the stipulated number of moves.
2. Black's defenses include the promotion of a certain pawn to a queen, rook, bishop, or knight. (Black may have other defenses as well.)
3. If Black promotes, then White must promote a pawn to the same piece to which Black promoted in order to complete the solution.
Babson Task Wikipedia Page
Combining 4 promotions from black with 4 echo promotions from white was the Holy Grail of chess for over a century. The greatest composers failed to compose this task. Then there was a 26 year old soccer trainer from Russia, who realized the impossible: Leonid Yarosh
(source: De man die de Babson Task wilde maken - Tim Krabbé)
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