A black pawn and a white pawn are placed on the first square and the last square of a $ 1\times n$ chessboard, respectively. Wiwit and Siti move alternatingly. Wiwit has the white pawn, and Siti has the black pawn. The white pawn moves first. In every move, the player moves her pawn one or two squares to the right or to the left, without passing the opponent's pawn. The player who cannot move anymore loses the game. Which player has the winning strategy? Explain the strategy.
To determine which player has the winning strategy, we will use induction and analyze the positions based on the value of \( n \).

1. **Base Cases:**
   - For \( n = 3 \):
     - Initial position: Black pawn at square 1, White pawn at square 3.
     - White moves first and can move to square 2.
     - Black cannot move to square 2 (occupied by White) and cannot move to square 0 (out of bounds).
     - Therefore, White wins.
   - For \( n = 4 \):
     - Initial position: Black pawn at square 1, White pawn at square 4.
     - White moves first and can move to square 3.
     - Black can move to square 2.
     - White can then move to square 2 or 4, and eventually, White will win by forcing Black into a position where it cannot move.
     - Therefore, White wins.
   - For \( n = 5 \):
     - Initial position: Black pawn at square 1, White pawn at square 5.
     - White moves first and can move to square 4.
     - Black can move to square 2.
     - White can move to square 3.
     - Black can move to square 3 or 1, and eventually, Black will win by forcing White into a position where it cannot move.
     - Therefore, Black wins.

2. **Inductive Hypothesis:**
   - Assume that for \( n = 3k \) and \( n = 3k + 1 \), White wins.
   - Assume that for \( n = 3k + 2 \), Black wins.

3. **Inductive Step:**
   - For \( n = 3k + 3 \):
     - White moves first and can move one step to the right.
     - This results in a position equivalent to \( n = 3k + 2 \) with switched colors.
     - By the inductive hypothesis, Black wins in this position.
     - Therefore, White wins for \( n = 3k + 3 \).
   - For \( n = 3k + 4 \):
     - White moves first and can move two steps to the right.
     - This results in a position equivalent to \( n = 3k + 2 \) with switched colors.
     - By the inductive hypothesis, Black wins in this position.
     - Therefore, White wins for \( n = 3k + 4 \).
   - For \( n = 3k + 5 \):
     - Whatever move White makes, White will land in a position equivalent to \( n = 3k + 3 \) or \( n = 3k + 4 \) with switched colors.
     - By the inductive hypothesis, White wins in these positions.
     - Therefore, Black wins for \( n = 3k + 5 \).

By induction, we have shown that:
- White wins for \( n = 3k \) and \( n = 3k + 1 \).
- Black wins for \( n = 3k + 2 \).

The final answer is Black wins for \( \boxed{ n = 3k + 2 } \), and White wins for other \( n \).