Pawn

Implement the base Pawn class (fyi- pretty different from the Bishop and Rook Class).

The pawn (♙, ♟) is the most numerous piece in the game of chess and, in most circumstances, the weakest. It historically represents soldiers or infantry, or more particularly, armed peasants or pikemen.[1] Each player begins a game with eight pawns, one on each square of the rank immediately in front of the other pieces. Check out the wikipedia entry here for more information.

• #30
• #32
• #31
• #35

首先阅读现有的 Bishop 和 Rook 类，然后查看关联的 issue #30、#32、#31 和 #35，以确定 Pawn 类的预期范围。当基础 Pawn 类按照项目的国际象棋棋子设计一致地实现，并且相关的 Pawn 要求得到处理后，工作即告完成。