We weren't 100% sure, but we think it goes like this:
1. You can ADD additional influence tokens in a block where you already have tokens - this to improve your strength in this block.
2. You can weaken another player's strength
Eg player A has 4 influence tokens in a block. Player B puts 2 of his tokens in the same block causing both players having to remove 2 tokens each, resulting in player A left with having 2 tokens in the block.
3. You can not "empty" a block
Eg player A has 2 tokens in a block, player B also puts 2 tokens in the same block, which would result in removing ALL tokens from the block.
We believe this is NOT allowed according to the rules on page 8.
... Rival tokens destroy each other ... remove them in mixed pairs until one color remains.
1. You can ADD additional influence tokens in a block where you already have tokens - this to improve your strength in this block.
2. You can weaken another player's strength
Eg player A has 4 influence tokens in a block. Player B puts 2 of his tokens in the same block causing both players having to remove 2 tokens each, resulting in player A left with having 2 tokens in the block.
3. You can not "empty" a block
Eg player A has 2 tokens in a block, player B also puts 2 tokens in the same block, which would result in removing ALL tokens from the block.
We believe this is NOT allowed according to the rules on page 8.
... Rival tokens destroy each other ... remove them in mixed pairs until one color remains.