The metaphorical value behind the chess symbolism is really interesting. Although, I have not watched the entire film, there are already numerous instances of its deeper meaning.
Life itself can be described as a chess game between Death. Everyone tries to cheat death. Each player gets a specific set of options to fight against Death. However, Death has his own chess pieces; aimed to kill you. Similar to capturing a pawn or rook, people try to eat healthier, abstain from sex, and work out. This effectively rids Death's options, making his life harder.
This idea is heavily represented in the movie. Antonius Block is literally playing Death in a game of chess. The game however goes on and off; they keep playing at random intervals. This is another representation of life, as we don't constantly try to fight off death. We think about other things. We goes through our lives. Sometimes, we even give in to Death, eating junk food and purposely injuring ourselves. No one person can focus upon a certain thing at all times.
Death, at one point in the film, pretends to be a pastor and makes Antonius Block give up his secrets of success. This ties into another theme of the film, Block's religious views. That scene shows his views upon God. He immediately saw a priest and confessed his deepest and inner thoughts. He trusts every imagery of God he can see. However, the priest actually turned out to be Death personified. This either foreshadows his eventual death with some religious aspect being at fault, or losing to Death at chess.
All in all, the film is pretty interesting, yet only at a metaphorical level. The film itself has gone pretty slowly. Sometimes I wonder why some scenes were shot at all, like the whole scene where the Jof(the juggler guy, whatever his name is) where he wakes up and wanders around for five minutes. Hopefully more interesting things will happen, like something added to the plot other than Antonius playing chess with Death.