We are numbering the rows and columns of a $29 \text{x} 29$ chess table with numbers $1, 2, ..., 29$ in order (Top row is numbered with $1$ and first columns is numbered with $1$ as well). We choose some of the squares in this chess table and for every selected square, we know that there exist at most one square having a row number greater than or equal to this selected square's row number and a column number greater than or equal to this selected square's column number. How many squares can we choose at most?
1. **Understanding the Problem:**
   We are given a $29 \times 29$ chessboard and need to select squares such that for every selected square, there is at most one other selected square with both a row number and a column number greater than or equal to the selected square's row and column numbers, respectively.

2. **Generalizing the Problem:**
   Let's generalize the problem for an $n \times n$ chessboard. We need to find the maximum number of squares that can be chosen under the given condition.

3. **Induction Hypothesis:**
   We will use induction on $n$. Assume that for an $n \times n$ chessboard, the maximum number of squares that can be chosen is $3k$ when $n = 2k$ and $3k + 1$ when $n = 2k + 1$.

4. **Base Case:**
   For $n = 1$, we can choose at most $1$ square. This satisfies the hypothesis since $3 \cdot 0 + 1 = 1$.

5. **Inductive Step:**
   Assume the hypothesis holds for an $(n-1) \times (n-1)$ chessboard. We need to show it holds for an $n \times n$ chessboard.

6. **Eliminating Rows and Columns:**
   If there is a chosen cell $A$ such that there are two more chosen cells $B$ and $C$ where $B$ lies in the same column as $A$ and $C$ lies in the same row as $A$, then there cannot be any chosen cells in the row of $A$ and $B$ and in the column of $A$ and $C$. This eliminates $2$ rows and $2$ columns.

7. **Induction Hypothesis Application:**
   By the induction hypothesis, the maximum number of chosen cells in the remaining $(n-2) \times (n-2)$ chessboard is $3k$ when $n-2 = 2k$ and $3k + 1$ when $n-2 = 2k + 1$.

8. **Maximal Number of Chosen Cells:**
   If for each chosen cell there is at most one other chosen cell in the same row or column, the maximal number of chosen cells is less than or equal to the bound given by the induction hypothesis.

9. **Construction for Odd and Even $n$:**
   For even $n = 2k$, the maximum number of chosen cells is $3k$. For odd $n = 2k + 1$, the maximum number of chosen cells is $3k + 1$.

10. **Conclusion:**
    For $n = 29$, which is odd, the maximum number of chosen cells is $3k + 1$ where $k = 14$. Thus, the maximum number of chosen cells is $3 \cdot 14 + 1 = 43$.

The final answer is $\boxed{43}$.