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Karthum: 1 is interesting. I suppose that it would be allowed to pick a pinned piece (which makes a triple check possible).
2 is sometimes played but is widely disapproved by the community of Bughouse (= 4-players) and Crazyhouse (=Loop Chess) players as a beginner's rule. It does not enhance the tactics, just makes them more artificial - like instead of mating by dropping a line piece 1 away from the king, dropping a line piece 2 away from the king, the opp blocks, take the blocking piece with mate.