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The 1-1-1-2-...-2-1 scheme is used when an even number of castles needs to be eliminated from each player. For example, when banning from 9 castles down to one each.
The 1-2-....-2-1 scheme is used when an odd number of castles needs to be eliminated. For example, when banning from 8 castles down to one each (in ROE it was also used when Conflux was banned). Or, as in the case of TK3 — from 9 castles down to two each.
The 1-2-....-2-1 scheme is used when an odd number of castles needs to be eliminated. For example, when banning from 8 castles down to one each (in ROE it was also used when Conflux was banned). Or, as in the case of TK3 — from 9 castles down to two each.