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Line 119: To the right is a directmate problem composed by Thomas Taverner in 1881. The key move is 1.Rh1. This is difficult to find because it makes no threat – instead, it puts Black in [[zugzwang]], a situation in which the player must move, yet every move leads to a disadvantage. Each of Black's nineteen legal replies allows an immediate mate. For example, if Black defends with 1...Bxh7, the d5 -square is no longer guarded, and White mates with 2.Nd5#. Or if Black plays 1...Re5, Black blocks that escape square for his king allowing 2.Qg4#. If Black plays 1...Rf6, then 2.Rh4#. Yet if Black could only pass (i.e., make no move at all), White would have no way to mate on his second move. The full solution is as follows: :1 Rh1{{chesspunc\|!}}

Chess problem: Difference between revisions