qusar: This is indeed a situation where the one having the prime should unblock but it is a different position of pieces. You don't have to just be in a column, but you must NOT have a chance to move in order someone to unblock you
(esconder) Ao submeter uma jogada, pode escolher o próximo jogo a mostrar, seleccionando a opção apropriada na lista ao lado do botão Submeter. (pauloaguia) (mostrar todas as dicas)