Norman Macleod
Springaren 1984
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1.Sb4! th. 2.Qxd5#
1...Qe6 2.Bxd5#
1...Qd6 2.Rdxd5#
1...Qc6 2.Rcxd5#
In the threat and all three variation the mate is given by Sb4 unparalyzed by capture of Sd5.
Black defends against threat by preparing paralysis of Qd5 as then d1 would be a flight, however,
three defences close black lines allowing other captures, with slightly varying effect.
1...Qe6 and 1...Qd6 have the same error - White can capture on d5 by Ba2/Rd1 without losing
control of some squares, while 1...Qc6 allows move by Rc5.
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