The idea is that each player will have a strategy for piece placement before the game begins and this strategy can be flexible and changed based on the opponent's moves. For example, after
1. b3 c6
2. e4 e5
Both players have not yet revealed their piece placements. In this case if white plays
3. Bxe5?? (And placing the other Bishop on h1 immediately), Black can play Bxe5 surprising that his bishops are placed on b8 and g8.( It must be noted here that the players have not yet revealed the placements of rooks and knights. They can do so once a move is played using these pieces)
Thus the pieces are deemed to be placed but neither players know where until they make moves. And it can come as a surprise.
The idea is that each player will have a strategy for piece placement before the game begins and this strategy can be flexible and changed based on the opponent's moves. For example, after
1. b3 c6
2. e4 e5
Both players have not yet revealed their piece placements. In this case if white plays
3. Bxe5?? (And placing the other Bishop on h1 immediately), Black can play Bxe5 surprising that his bishops are placed on b8 and g8.( It must be noted here that the players have not yet revealed the placements of rooks and knights. They can do so once a move is played using these pieces)
Thus the pieces are deemed to be placed but neither players know where until they make moves. And it can come as a surprise.