The Four Move Checkmate - Academic Chess

The Four Move exerciser
cuuuuuuuuC
(rdb1kgn4}
70p0pdp0p}
6wdwdwdwd}
5dwdw0wdw}
&wdBhPdwd}
3dwdwdQdw}
2P)P)w)P)}
%$NGwIwHR}
v,./9EFJMV
cuuuuuuuuC
(rdb1kgn4}
70p0pdp0p}
6wdndwdwd}
5dwdw0wdQ}
&wdBdPdwd}
3dwdwdwdw}
2P)P)w)P)}
%$NGwIwHR}
v,./9EFJMV
CuuuuuuuuC
(rhw1kgw4}
7dp0w0p0p}
6pdwdwhwd}
5dwdwHwdw}
&wdB)wdwd}
3dwdw)wdw}
2P)wdw)P)}
%$NGbIwdR}
v,./9EFJMV
#1 White mates in 1 move #2 Black defends f7. #3 White mates in 1 move.
cuuuuuuuuC
(wdw4kgwd}
7dwdq0pdw}
6wdwdPdwd}
5dwdwdwdw}
&wdBdwdwd}
3dwdwdwdw}
2wdwdwdwd}
%dwdwIwdw}
v,./9EFJMV
cuuuuuuuuC
(rdbdkdn4}
70p0pdp0p}
6wdNdw1wd}
5dwgwdwdw}
&wdwdPdwd}
3dwdwdwdw}
2P)Pdw)P)}
%$NGQIBdR}
v,./9EFJMV
cuuuuuuuuC
(rhw1kgn4}
70p0wdp0p}
6wdwdwdwd}
5dwdw0wdw}
&wdwdPdwd}
3dwdwdQdw}
2P)Pdw)P)}
%$NGwIBdR}
v,./9EFJMV
#4. White mates in 1 move #5. White defends f2. #6 White threatens on f7.
cuuuuuuuuC
(rhb1kdw4}
70pdpdp0p}
6wdwdpdwd}
5dwgwdwGw}
&wdPdndwd}
3dwHwdwdw}
2P)wdP)P)}
%$wdQIBHR}
v,./9EFJMV
cuuuuuuuuC
(rhw1kgw4}
7dp0w0p0p}
6pdwdwhwd}
5dwdwHwdb}
&wdB)wdwd}
3dwdw)wdw}
2P)wdw)P)}
%$NGQIwdR}
v,./9EFJMV
cuuuuuuuuC
(rdb1kdw4}
70pdpdp0p}
6wdndphwd}
5dwgwdwGw}
&wdPdNdwd}
3dwdwdNdw}
2P)wdP)P)}
%$wdQIBdR}
v,./9EFJMV
7. White takes the ½ or the » #8 White finds the key to winning f7. #9 Black finds the key to winning f2.