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Errata ;
This study has the following references
Krejcik, tl10#465, 1953
Nevertheless, it is a sound study.
1. Ne4+
1. … Ke6
2. Qc4+ Qd5
3. Nc5+ Kd6
4. Nb7+ Ke6
5. Nd8+ Kd6
6. Qb4+ Qc5
7. Nb7+ Kxc6
8. Nxc5 Black wouldn’t want to do this, so…
1. … Kf5
2. Qf8+ Kxe4
3. Qxf3+ Kd3
4. Qd1+ and the queen, which Black doesn’t want either, so…
2. … Kg4
3. Qxf3+ Kxh4
4. Qh1+ Kg4
5. Qxf3+ with a perpetual, which Black would go for at this point, but White has better…
5. Qg2 Kf5 (otherwise, Qh3#)
6. Qh3+ Kxe4
7. Qf3 Kd3
8. Qd1+ and the queen.
Bad day for Black.
Qf8+,Qg8+followed by N+ and Q+s and ++
h
I was careless in my post. The move that led to perpetual should have been 5. Qf3+, not 5. Qxf3+, and the move to avoid the perpetual should have been 5. Kg2, not 5. Qg2. Bad day for jcheyne.