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// Move piece from oldSq to newSq and return true. If

// move is not possible, do nothing and return false.

private boolean validMove(CheckersSquare oldSq,

CheckersSquare newSq)

// Return "move oldSq to newSq is valid non-jump

// move for player colorToPlay". Assume oldSq contains

// a piece of colorToPlay and newSq is empty black square

private boolean isValidNonjump(CheckersSquare oldSq, CheckersSquare newSq)

// Return "move oldSq to newSq is valid jump for player

// colorToPlay". Assume oldSq contains piece and that

// newSq is an empty black square

private boolean isValidjump(CheckersSquare oldSq,

CheckersSquare newSq)

// clickflag=1. If pieces on oldSq and newSq have same

// color, switch to moving the piece on newSq. Otherwise

// try to move piece from oldSq to square newSq. If not

// possible, give error message; if possible, do it and

// switch players

public void processClickTwo(CheckersSquare newSq)

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