Not really. The diagram estimates them at 1.5 Pawn. The problem with hoppers is that their value depends on piece density a lot. Which is still something different as the 'classical' game phase, which is based on total piece value. Usually Pawns are not counted in game phase, but their presence will be very helpful to the Grasshoppers. Likewise, weak as they are, the Grasshoppers probably contribute very little to game phase. But their presence will be very helpful to each other. In other word, there will be a large cooperative effect for the Grasshoppers. The diagram only estimates piece values at one piece density.
Not really. The diagram estimates them at 1.5 Pawn. The problem with hoppers is that their value depends on piece density a lot. Which is still something different as the 'classical' game phase, which is based on total piece value. Usually Pawns are not counted in game phase, but their presence will be very helpful to the Grasshoppers. Likewise, weak as they are, the Grasshoppers probably contribute very little to game phase. But their presence will be very helpful to each other. In other word, there will be a large cooperative effect for the Grasshoppers. The diagram only estimates piece values at one piece density.