OP means the Original Poster; that would be you.
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What I was saying was that since you're 1400 in tactics and endgame, but only 1200 in the opening, that you shouldn't resign just because you hang a piece in the opening against an equally-rated opponent. Your pieces are worth more in the middlegame and endgame than theirs and you should have a great opportunity to win back the lost piece, or even win the game.
Your pieces are worth less in the opening, just as your pawns are worth more in the endgame.
anyone?