Are there games where the pawn structure is completely locked?
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Imagine games where no pawns or pieces are taken, leaving a double pawn chain with 16 pawns. It would be interesting to see how the game proceeds and who is the one to break through first.
Breaking through in such a position would either be impossible (if the pawns were absolutely locked - vertically adjacent on each file), or would lose a pawn with no compensation for the person breaking through (if they are locked in such a way that allows a breakthrough).
Therefore, any decent players would immediately agree to a draw in this type of position.