Yeah, sorry. Bd2 is surely the correct one to make sense.
RE: Chess problem 52, and the "null-move heuristic". / Schachaufgabe 52 und die "Null-Zug-Suche".
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Chess problem 52, and the "null-move heuristic". / Schachaufgabe 52 und die "Null-Zug-Suche".