1.Qg4! -2.Qxe6+ Be5 3.Qxe5#,
1...e5 2.Rc4+ Bxc4 3.Sc5#,
1...Bxd7 2.Rc4+ Ke5 3.Nxd7#,
1...Bc4 2.Rxc4+ Ke5 3.Qxe6#,Lincoln theme.
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1,,,Bxe2 2.Qxe2+ Be3 3.Qxe3#,
1...exd6 2.Nxd6+ Kd4 3.Nxe6#,
1...exf6 2.Nh7 ~ 3.Nxf6#,
1...Nc6 2.Re5+ Nxe5+ 3.Nc5#,2...Kxe5 3.Qxe6#,
1...Nd3 2.Qg2+ Rf3 3.exf3,Qxf3#-weak dual,
1...Nf3 2.Bxc2+ Bd3 3.exd3,Bxd3#-weak dual.
Correction of N.Easter's threemover,British Chess Problem Society,1927.
