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Line 34:
|bl|bl| | | | | |pd
| | |rl|bd| | |bd|qd
| {{hidden|ta1=left|fw1=normal|White mates in two |Solution: 1.Rcc7{{chesspunc|!}} (threatening 2.Nc3)
* 1...Nxb3 2.Qd3#
* 1...Nb5 2.Rc5#
Line 121:
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|!}}
::1...Bxh7, 2.Nd5# (unguards d5)
::1...Bf7, 2.Qf5# (interferes with rook’s guard of f5)
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