In Shogi pawn drop checkmate is forbidden. This achievement is that the player leaves the opponent no option but to drop a pawn that is forbidden by the rule.
FrancescoLR: >would do that even bigger >than .. lets see who never use vacation day and >never times out during the year and finish more >than lets say 1000 games ??
That's interesting. Maybe the achievement can be titled: Have a Nice Game Holiday