4. P2.3 E5-7
5. P5+1 mate
1 point (Answer11)
The position after 1. ... E3-5 will be treated after the third
move of the main line, all other moves will also lead to positions
of the main line because Red will continue with P5+1, except
for hopeless moves like 1. ... R1-7 2.H7-9
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