Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Game | Date | Team | Score | High points | High rebounds | High assists | Location Attendance | Series |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1.0 | April 20 | @ Boston | 81–104 | A. Horford (20) | A. Horford (10) | J. Johnson (7) | TD Banknorth Garden 18,624 | 0–1 |
| 2.0 | April 23 | @ Boston | 77–96 | Two-Way Tie (13) | A. Horford (9) | Two-Way Tie (3) | TD Banknorth Garden 18,624 | 0–2 |
| 3.0 | April 26 | Boston | 102–93 | J. Smith (27) | A. Horford (10) | M. Bibby (8) | Philips Arena 19,725 | 1–2 |
| 4.0 | April 28 | Boston | 97–92 | J. Johnson (35) | A. Horford (13) | J. Johnson (6) | Philips Arena 20,016 | 2–2 |
| 5.0 | April 30 | @ Boston | 85–110 | J. Johnson (21) | A. Horford (10) | A. Horford (5) | TD Banknorth Garden 18,624 | 2–3 |
| 6.0 | May 2 | Boston | 103–100 | M. Williams (18) | Four-Way Tie (6) | M. Bibby (7) | Philips Arena 20,425 | 3–3 |
Question:
Who had the high rebounds for the game on april 23?
Answer:
A. Horford (9)