here is one of the two designers of Ali Baba.
In a recent game the following situation occurred. An opponent took a white tile and blocked all yellow tiles. In the next turn i took a green tile, but the only adjacent open tiles were yellow. Can i take the adjacent open tile? The answer is no, you cannot due to the restriction of the white tile effect.
The only few exceptions to the white tile effect are:
- There are no other open tiles available when it's your turn to take a tile. This however never applies to the green tile effect.
- You are stealing a tile from another player, due to the pourple's effect.
In any other case, the white tile effect prevents you from taking the restricted tiles.
Hope it's clear, however do not hesitate to ask in case of further doubts.