<div><br /></div><div><div>1.Qe8? threat: 2.Qxe5+ Bb2 3.Qxb2#</div><div>1...Bb2 2.Qa8+ Ba3 3.Qxa3+ Ba2+ 4.Qxa2#</div><div>but: 1...Ba2+!</div><div><br /></div><div>1.Qxb5! threat: 2.Qxe5+ Bb2 3.Qxb2#</div><div>1...Ba2+ 2.Kxc2 threat: 3.Qxe5+ Bb2 4.Qxb2#</div><div>               2...Bb3+ 3.Qxb3 threat: 4.Qb1#</div><div>                              3...Bb2 4.Qxb2#</div><div>1...Bb2 2.Qa4+ Ba3 3.Qxa3+ Ba2+ 4.Qxa2#</div><div><br /></div><div>Minimal engraving. Refutation a false trail is one of the defenses in the solution.</div></div><br />