I can't get 8 down, I'll try again later.
Chess-oriented crossword: intermediate

Another hint for 8 down: The side which accomplishes the _____________, often changes the nature of the position on the board, from a closed position to an open position. This is sometimes accomplished by a piece or a pawn sacrifice.
Also, the word may be considered the opposite of "deadlock."

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4 down is Hal.
Correct.