<div class='user_solution'><strong>1. Ka6+!</strong> white battery <strong>1...Kf8</strong> (1...Kd7? 2. Qd7++-) <strong>2. Q:e4</strong> ( 2.e7+? Kg7 3. e8Q R:e8 4. Q:e8 Q:c7 -+) <strong>2...Bb8+!</strong> black battery <strong>3. Q:a8</strong> <strong>Q:d3+</strong> ( 3...Qa3+ 4. Kb6=) <strong>4. Kb6!!</strong> ( 4. Kb7? Qb5+ 5. Bb6 Bd5+ 6. K:b8 Q:b6+ 7. Kc6 B:e6+ 8. Kd8 Qd4+ -+; 4. Ka5? Qc3+ 5. Kb5 Qc4+ 6. Ka5 Q:c7+-+) <strong>4...Q:e3+</strong> ( 4...Qb3+ 5. Kc6 Qd5+ 6. Kb6=)<strong> 5. Kb7!</strong> <strong>Bd5+</strong> ( 5...Qb3+ 6. Kc8!=) <strong>6. Kc8!</strong> ( 6. K:b8 Qb6+-+) <strong>6...Qb6</strong>! ( 6...B:a8? 7. cbQ=) <strong>7. cbS!!</strong> ( 7.cbQ? Be6x; 7. Q:d5? Q:c7x) <strong>7...B:e6+</strong> (7...B:a8 8. Sd7+=) <strong>8. Sd7+ Ke8! 9. Qa7!</strong> ( 9. Qa4? Qd8+ 10. Kb7 Bd5+ 11. Ka6 Qa8+ -+) <strong>9...Q:a7 -pat</strong> <br />  version incorrect study JT &quot;Kopnin-70&quot; 1988<br /></div>