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if ( (oX == nX && oY == nY) // Move to itself || board[nI] == null // or move to empty position || !canMove(oX, oY, nX, nY) // No way from the old position to the new ) { board[oI].posX = -1; board[oI].posY = -1; board[oI].posX = oX; board[oI].posY = oY; return false; }
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