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This week’s problem is a serieshelpmate. Black plays four consecutive
moves, at the end of which White can mate in one. Only the last of
Black’s four moves may check the WK. The problem is also a twin.
When you have solved the diagram position, replace the WBf5 with a
WR, and it is again serieshelpmate in four.
The two solutions are:
Diagram: 1.Ba1 2.Qb2 3.Qh8 4.Bg7 5.Be6 mate
Twin with WRf5: 1.Ra7 2.Qb7 3.Qh7 4.Rg7 5.Rf8 mate
In each solution Black plays a Bristol manoeuvre, bringing his
bishop/rook to the furthest square on the line, so as to allow the
BQ to step inside it (thus, Ba1 to allow Qb2, and Ra7 to allow Qb7).
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