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The biggest clue is the pawn structure. Allure's first diagram hints that is was a Grunfeld due to the queenside pawns. (Although since there are so many transpositions that the opening can change on a move's notice.) The further the game proceeds, the harder it becomes to guess the opening. As a teen, I played the Blackmar–Diemer Gambit, which had the ...


Some positions have clues which at least rule out certain openings, even if they don't identify one specific opening. For example, if a pawn is still at home, then the opening wasn't one in which that pawn moves or gets taken.


the absence of Black's C pawn and the fight against the D5 square That's more or less it. This kind of position is most probably the result of a Sicilian. Could it be something else? It can, but the Sicilian is the most likely opening. can we reverse engineer every middle game position to an opening No. This position for example is a middlegame with no ...

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