Thursday Morning Riddle

I am black or I’m white for your classroom decor;
Used for fixing the window, or blocking the door;
I lie flat in a chess game, but not Connect Four;
And in Strangelove, I’m big; in Glengarry, the score.

Who am I?

UPDATE: Riddle solved by Craig. See comments for answer.

3 Responses to “Thursday Morning Riddle”

  1. Craig Says:

    “Gentlemen, you can’t fight in here–this is the War Room!”

    You’re a board, yes?

  2. Benjamin Baxter Says:

    I can’t believe I missed this one. I love that movie.

  3. Bill Says:

    BOARD is correct. Way to go, Craig!

    Benjamin, I have to say that both movies are among my very favorites. I was very pleased to work them both into the same riddle.

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