I can see several seemingly profitable temporary attacks. These are essentially variations of timing attacks on when and in what order to release information to the rest of the network.
But how is this possible? If someone finds a block and is now 1 block ahead of other miners,
either this someone is confident of being able to outmine everyone else at least short term,
or not releasing information (in order to get 2 blocks ahead) just means (50%+ probability) someone
else will find and release information for the 1 block. Now you are behind and lost block reward
