When game starts, board is entirely filled with pegs except for the central hole. Objective is, making valid moves, to empty the entire board except for a solitary peg. When you reach this state, you solved the Peg Solitaire ! A valid move is to jump a peg orthogonally over an adjacent peg into a hole two positions away and then to remove the jumped peg. If no moves are possible and several pegs are still on the board, game is over !