Two different squares are randomly chosen from an $8\times8$ chessboard. What is the probability that two queens placed on the two squares can attack each other? Recall that queens in chess can attack any square in a straight line vertically, horizontally, or diagonally from their current position.
To solve this problem, we need to calculate the probability that two queens placed on two randomly chosen squares of an $8 \times 8$ chessboard can attack each other. 

1. **Total number of ways to choose two different squares:**
   The total number of ways to choose 2 squares out of 64 is given by the combination formula:
   \[
   \binom{64}{2} = \frac{64 \times 63}{2} = 2016
   \]

2. **Number of ways two queens can attack each other:**
   We need to count the number of pairs of squares where two queens can attack each other. Queens can attack each other if they are in the same row, column, or diagonal.

   - **Same row:**
     There are 8 rows, and in each row, we can choose 2 squares in \(\binom{8}{2}\) ways. Therefore, the number of ways to choose 2 squares in the same row is:
     \[
     8 \times \binom{8}{2} = 8 \times \frac{8 \times 7}{2} = 8 \times 28 = 224
     \]

   - **Same column:**
     Similarly, there are 8 columns, and in each column, we can choose 2 squares in \(\binom{8}{2}\) ways. Therefore, the number of ways to choose 2 squares in the same column is:
     \[
     8 \times \binom{8}{2} = 8 \times 28 = 224
     \]

   - **Same diagonal:**
     For diagonals, we need to consider both the main diagonals and the anti-diagonals. The number of squares on each diagonal varies:
     - For diagonals with 2 squares: \(\binom{2}{2} = 1\)
     - For diagonals with 3 squares: \(\binom{3}{2} = 3\)
     - For diagonals with 4 squares: \(\binom{4}{2} = 6\)
     - For diagonals with 5 squares: \(\binom{5}{2} = 10\)
     - For diagonals with 6 squares: \(\binom{6}{2} = 15\)
     - For diagonals with 7 squares: \(\binom{7}{2} = 21\)
     - For diagonals with 8 squares: \(\binom{8}{2} = 28\)

     There are 2 main diagonals with 2 squares, 2 with 3 squares, 2 with 4 squares, 2 with 5 squares, 2 with 6 squares, 2 with 7 squares, and 1 with 8 squares. The same applies to anti-diagonals. Therefore, the total number of ways to choose 2 squares on the same diagonal is:
     \[
     2 \times (1 + 3 + 6 + 10 + 15 + 21) + 28 = 2 \times 56 + 28 = 112 + 28 = 140
     \]

3. **Total number of ways two queens can attack each other:**
   Adding up the number of ways for rows, columns, and diagonals:
   \[
   224 + 224 + 140 = 588
   \]

4. **Probability calculation:**
   The probability that two queens placed on two randomly chosen squares can attack each other is the ratio of the number of favorable outcomes to the total number of outcomes:
   \[
   \frac{588}{2016} = \frac{49}{168} = \frac{7}{24}
   \]

The final answer is \(\boxed{\frac{7}{24}}\).