<div class='user_solution'><font face="Times New Roman" size="3"> </font><p style="margin: 0cm 0cm 0pt; -ms-text-autospace:; tab-stops: 35.4pt 70.8pt 106.2pt 141.6pt 177.0pt 212.4pt 247.8pt 283.2pt 318.6pt 354.0pt 389.4pt 424.8pt 460.2pt 495.6pt 531.0pt 566.4pt 601.8pt 637.2pt 672.6pt 708.0pt 743.4pt 778.8pt 814.2pt 849.6pt 885.0pt 920.4pt 955.8pt 991.2pt 1026.6pt 1062.0pt 1097.4pt 1132.8pt 1168.2pt 1203.6pt 1239.0pt 1274.4pt 1309.8pt 1345.2pt 1380.6pt 1416.0pt; mso-layout-grid-align: none;"><b style="mso-bidi-font-weight: normal;"><span lang="EN-US" style="font-size: 14pt; mso-ansi-language: EN-US;"><font face="Times New Roman">1.Kc7!! c1Q+ 2.Kb7! Ke4 3.Sab6! Qc2 4.Sd7! Kd5</font></span></b></p><font face="Times New Roman" size="3"> </font><p style="margin: 0cm 0cm 0pt; -ms-text-autospace:; tab-stops: 35.4pt 70.8pt 106.2pt 141.6pt 177.0pt 212.4pt 247.8pt 283.2pt 318.6pt 354.0pt 389.4pt 424.8pt 460.2pt 495.6pt 531.0pt 566.4pt 601.8pt 637.2pt 672.6pt 708.0pt 743.4pt 778.8pt 814.2pt 849.6pt 885.0pt 920.4pt 955.8pt 991.2pt 1026.6pt 1062.0pt 1097.4pt 1132.8pt 1168.2pt 1203.6pt 1239.0pt 1274.4pt 1309.8pt 1345.2pt 1380.6pt 1416.0pt; mso-layout-grid-align: none;"><font face="Times New Roman"><b style="mso-bidi-font-weight: normal;"><span lang="EN-US" style="font-size: 14pt; mso-ansi-language: EN-US;">5.Sb8!!</span></b><span lang="EN-US" style="font-size: 14pt; mso-ansi-language: EN-US;"> <b style="mso-bidi-font-weight: normal;">– white built a new theoretically impenetrable fortress</b> </span></font></p><font face="Times New Roman" size="3"> </font><p style="margin: 0cm 0cm 0pt; -ms-text-autospace:; tab-stops: 35.4pt 70.8pt 106.2pt 141.6pt 177.0pt 212.4pt 247.8pt 283.2pt 318.6pt 354.0pt 389.4pt 424.8pt 460.2pt 495.6pt 531.0pt 566.4pt 601.8pt 637.2pt 672.6pt 708.0pt 743.4pt 778.8pt 814.2pt 849.6pt 885.0pt 920.4pt 955.8pt 991.2pt 1026.6pt 1062.0pt 1097.4pt 1132.8pt 1168.2pt 1203.6pt 1239.0pt 1274.4pt 1309.8pt 1345.2pt 1380.6pt 1416.0pt; mso-layout-grid-align: none;"><font face="Times New Roman"><span style="font-size: 14pt;">5… </span><span lang="EN-US" style="font-size: 14pt; mso-ansi-language: EN-US;">Qb</span><span style="font-size: 14pt;">3+ 6.</span><span lang="EN-US" style="font-size: 14pt; mso-ansi-language: EN-US;">Kc</span><span style="font-size: 14pt;">7! </span><span lang="EN-US" style="font-size: 14pt; mso-ansi-language: EN-US;">Qc</span><span style="font-size: 14pt;">4+ 7.</span><span lang="EN-US" style="font-size: 14pt; mso-ansi-language: EN-US;">Kb</span><span style="font-size: 14pt;">7! </span><span lang="EN-US" style="font-size: 14pt; mso-ansi-language: EN-US;">Qb</span><span style="font-size: 14pt;">5+ 8.</span><span lang="EN-US" style="font-size: 14pt; mso-ansi-language: EN-US;">Kc</span><span style="font-size: 14pt;">7! </span><span lang="EN-US" style="font-size: 14pt; mso-ansi-language: EN-US;">Qc</span><span style="font-size: 14pt;">5+ 9.</span><span lang="EN-US" style="font-size: 14pt; mso-ansi-language: EN-US;">Kb</span><span style="font-size: 14pt;">7! =</span></font></p><font face="Times New Roman" size="3"> </font><p style="margin: 0cm 0cm 0pt; -ms-text-autospace:; tab-stops: 35.4pt 70.8pt 106.2pt 141.6pt 177.0pt 212.4pt 247.8pt 283.2pt 318.6pt 354.0pt 389.4pt 424.8pt 460.2pt 495.6pt 531.0pt 566.4pt 601.8pt 637.2pt 672.6pt 708.0pt 743.4pt 778.8pt 814.2pt 849.6pt 885.0pt 920.4pt 955.8pt 991.2pt 1026.6pt 1062.0pt 1097.4pt 1132.8pt 1168.2pt 1203.6pt 1239.0pt 1274.4pt 1309.8pt 1345.2pt 1380.6pt 1416.0pt; mso-layout-grid-align: none;"><font face="Times New Roman"><span style="font-size: 14pt;">5... </span><span lang="EN-US" style="font-size: 14pt; mso-ansi-language: EN-US;">Qh</span><span style="font-size: 14pt;">7+ 6.</span><span lang="EN-US" style="font-size: 14pt; mso-ansi-language: EN-US;">Kb</span><span style="font-size: 14pt;">6! </span><span lang="EN-US" style="font-size: 14pt; mso-ansi-language: EN-US;">Qh</span><span style="font-size: 14pt;">2+ 7.</span><span lang="EN-US" style="font-size: 14pt; mso-ansi-language: EN-US;">Kb</span><span style="font-size: 14pt;">7! </span><span lang="EN-US" style="font-size: 14pt; mso-ansi-language: EN-US;">Qb</span><span style="font-size: 14pt;">2+ 8.</span><span lang="EN-US" style="font-size: 14pt; mso-ansi-language: EN-US;">Kc</span><span style="font-size: 14pt;">7! = </span></font></p><font face="Times New Roman" size="3"> </font><p style="margin: 0cm 0cm 0pt; -ms-text-autospace:; tab-stops: 35.4pt 70.8pt 106.2pt 141.6pt 177.0pt 212.4pt 247.8pt 283.2pt 318.6pt 354.0pt 389.4pt 424.8pt 460.2pt 495.6pt 531.0pt 566.4pt 601.8pt 637.2pt 672.6pt 708.0pt 743.4pt 778.8pt 814.2pt 849.6pt 885.0pt 920.4pt 955.8pt 991.2pt 1026.6pt 1062.0pt 1097.4pt 1132.8pt 1168.2pt 1203.6pt 1239.0pt 1274.4pt 1309.8pt 1345.2pt 1380.6pt 1416.0pt; mso-layout-grid-align: none;"><font face="Times New Roman"><b style="mso-bidi-font-weight: normal;"><span lang="EN-US" style="font-size: 14pt; mso-ansi-language: EN-US;">5… Qh2</span></b><span lang="EN-US" style="font-size: 14pt; mso-ansi-language: EN-US;">(Qc1) <b style="mso-bidi-font-weight: normal;">6.Sa7!! –</b></span><span lang="EN-US" style="mso-ansi-language: EN-US;"><font size="3"> </font></span><b style="mso-bidi-font-weight: normal;"><span lang="EN-US" style="font-size: 14pt; mso-ansi-language: EN-US;">transformation into major new theoretical fortress, which is inaccessible to black under any arrangement of black pieces</span></b></font></p><font face="Times New Roman" size="3"> </font><p style="margin: 0cm 0cm 0pt; -ms-text-autospace:; tab-stops: 35.4pt 70.8pt 106.2pt 141.6pt 177.0pt 212.4pt 247.8pt 283.2pt 318.6pt 354.0pt 389.4pt 424.8pt 460.2pt 495.6pt 531.0pt 566.4pt 601.8pt 637.2pt 672.6pt 708.0pt 743.4pt 778.8pt 814.2pt 849.6pt 885.0pt 920.4pt 955.8pt 991.2pt 1026.6pt 1062.0pt 1097.4pt 1132.8pt 1168.2pt 1203.6pt 1239.0pt 1274.4pt 1309.8pt 1345.2pt 1380.6pt 1416.0pt; mso-layout-grid-align: none;"><font face="Times New Roman"><b style="mso-bidi-font-weight: normal;"><span style="font-size: 14pt;">6… </span></b><b style="mso-bidi-font-weight: normal;"><span lang="FR" style="font-size: 14pt; mso-ansi-language: FR;">Kd</span></b><b style="mso-bidi-font-weight: normal;"><span style="font-size: 14pt;">6 7.</span></b><b style="mso-bidi-font-weight: normal;"><span lang="FR" style="font-size: 14pt; mso-ansi-language: FR;">Sc</span></b><b style="mso-bidi-font-weight: normal;"><span style="font-size: 14pt;">8+! </span></b><b style="mso-bidi-font-weight: normal;"><span lang="FR" style="font-size: 14pt; mso-ansi-language: FR;">Kd</span></b><b style="mso-bidi-font-weight: normal;"><span style="font-size: 14pt;">5 8.</span></b><b style="mso-bidi-font-weight: normal;"><span lang="FR" style="font-size: 14pt; mso-ansi-language: FR;">Sa</span></b><b style="mso-bidi-font-weight: normal;"><span style="font-size: 14pt;">7!! </span></b><b style="mso-bidi-font-weight: normal;"><span lang="EN-US" style="font-size: 14pt; mso-ansi-language: EN-US;">Kc5 9.Sa6+! – the transformation of the echo fortress </span></b></font></p><font face="Times New Roman" size="3"> </font><p style="margin: 0cm 0cm 0pt; -ms-text-autospace:; tab-stops: 35.4pt 70.8pt 106.2pt 141.6pt 177.0pt 212.4pt 247.8pt 283.2pt 318.6pt 354.0pt 389.4pt 424.8pt 460.2pt 495.6pt 531.0pt 566.4pt 601.8pt 637.2pt 672.6pt 708.0pt 743.4pt 778.8pt 814.2pt 849.6pt 885.0pt 920.4pt 955.8pt 991.2pt 1026.6pt 1062.0pt 1097.4pt 1132.8pt 1168.2pt 1203.6pt 1239.0pt 1274.4pt 1309.8pt 1345.2pt 1380.6pt 1416.0pt; mso-layout-grid-align: none;"><span lang="EN-US" style="font-size: 14pt; mso-ansi-language: EN-US;"><font face="Times New Roman"> </font></span></p><font face="Times New Roman" size="3"> </font><p style="margin: 0cm 0cm 0pt; -ms-text-autospace:; tab-stops: 35.4pt 70.8pt 106.2pt 141.6pt 177.0pt 212.4pt 247.8pt 283.2pt 318.6pt 354.0pt 389.4pt 424.8pt 460.2pt 495.6pt 531.0pt 566.4pt 601.8pt 637.2pt 672.6pt 708.0pt 743.4pt 778.8pt 814.2pt 849.6pt 885.0pt 920.4pt 955.8pt 991.2pt 1026.6pt 1062.0pt 1097.4pt 1132.8pt 1168.2pt 1203.6pt 1239.0pt 1274.4pt 1309.8pt 1345.2pt 1380.6pt 1416.0pt; mso-layout-grid-align: none;"><font face="Times New Roman"><b style="mso-bidi-font-weight: normal;"><span style="font-size: 14pt;">8… </span></b><b style="mso-bidi-font-weight: normal;"><span lang="FR" style="font-size: 14pt; mso-ansi-language: FR;">Qb</span></b><b style="mso-bidi-font-weight: normal;"><span style="font-size: 14pt;">2+ 9.</span></b><b style="mso-bidi-font-weight: normal;"><span lang="FR" style="font-size: 14pt; mso-ansi-language: FR;">Kc</span></b><b style="mso-bidi-font-weight: normal;"><span style="font-size: 14pt;">7! </span></b><b style="mso-bidi-font-weight: normal;"><span lang="FR" style="font-size: 14pt; mso-ansi-language: FR;">Qe</span></b><b style="mso-bidi-font-weight: normal;"><span style="font-size: 14pt;">5+ 10.</span></b><b style="mso-bidi-font-weight: normal;"><span lang="FR" style="font-size: 14pt; mso-ansi-language: FR;">Kb</span></b><b style="mso-bidi-font-weight: normal;"><span style="font-size: 14pt;">7! </span></b><b style="mso-bidi-font-weight: normal;"><span lang="FR" style="font-size: 14pt; mso-ansi-language: FR;">Qg</span></b><b style="mso-bidi-font-weight: normal;"><span style="font-size: 14pt;">7+ 11.</span></b><b style="mso-bidi-font-weight: normal;"><span lang="FR" style="font-size: 14pt; mso-ansi-language: FR;">Kb</span></b><b style="mso-bidi-font-weight: normal;"><span style="font-size: 14pt;">6! </span></b><b style="mso-bidi-font-weight: normal;"><span lang="FR" style="font-size: 14pt; mso-ansi-language: FR;">Qg1 12.Kb7! Kc5 </span></b></font><b style="mso-bidi-font-weight: normal;"><span lang="FR" style="font-size: 14pt; mso-ansi-language: FR;"><font face="Times New Roman">13.Sa6+! Kd5 14.Sb8!! Kd6 </font></span></b></p><p style="margin: 0cm 0cm 0pt; -ms-text-autospace:; tab-stops: 35.4pt 70.8pt 106.2pt 141.6pt 177.0pt 212.4pt 247.8pt 283.2pt 318.6pt 354.0pt 389.4pt 424.8pt 460.2pt 495.6pt 531.0pt 566.4pt 601.8pt 637.2pt 672.6pt 708.0pt 743.4pt 778.8pt 814.2pt 849.6pt 885.0pt 920.4pt 955.8pt 991.2pt 1026.6pt 1062.0pt 1097.4pt 1132.8pt 1168.2pt 1203.6pt 1239.0pt 1274.4pt 1309.8pt 1345.2pt 1380.6pt 1416.0pt; mso-layout-grid-align: none;"><b style="mso-bidi-font-weight: normal;"><span lang="FR" style="font-size: 14pt; mso-ansi-language: FR;"><font face="Times New Roman">15.Sc8+! – echo variant = </font></span></b></p><font face="Times New Roman" size="3"> </font><p style="margin: 0cm 0cm 0pt; -ms-text-autospace:; tab-stops: 35.4pt 70.8pt 106.2pt 141.6pt 177.0pt 212.4pt 247.8pt 283.2pt 318.6pt 354.0pt 389.4pt 424.8pt 460.2pt 495.6pt 531.0pt 566.4pt 601.8pt 637.2pt 672.6pt 708.0pt 743.4pt 778.8pt 814.2pt 849.6pt 885.0pt 920.4pt 955.8pt 991.2pt 1026.6pt 1062.0pt 1097.4pt 1132.8pt 1168.2pt 1203.6pt 1239.0pt 1274.4pt 1309.8pt 1345.2pt 1380.6pt 1416.0pt; mso-layout-grid-align: none;"><span style="font-size: 14pt;"><font face="Times New Roman"> </font></span></p><font face="Times New Roman" size="3"> </font><p style="margin: 0cm 0cm 0pt; -ms-text-autospace:; tab-stops: 35.4pt 70.8pt 106.2pt 141.6pt 177.0pt 212.4pt 247.8pt 283.2pt 318.6pt 354.0pt 389.4pt 424.8pt 460.2pt 495.6pt 531.0pt 566.4pt 601.8pt 637.2pt 672.6pt 708.0pt 743.4pt 778.8pt 814.2pt 849.6pt 885.0pt 920.4pt 955.8pt 991.2pt 1026.6pt 1062.0pt 1097.4pt 1132.8pt 1168.2pt 1203.6pt 1239.0pt 1274.4pt 1309.8pt 1345.2pt 1380.6pt 1416.0pt; mso-layout-grid-align: none;"><font face="Times New Roman"><b style="mso-bidi-font-weight: normal;"><span style="font-size: 14pt;">3… </span></b><b style="mso-bidi-font-weight: normal;"><span lang="EN-US" style="font-size: 14pt; mso-ansi-language: EN-US;">Qh1! 4.Kc7!! Qh7 5.Kc6!! Kd4 </span></b></font></p><font face="Times New Roman" size="3"> </font><p style="margin: 0cm 0cm 0pt; -ms-text-autospace:; tab-stops: 35.4pt 70.8pt 106.2pt 141.6pt 177.0pt 212.4pt 247.8pt 283.2pt 318.6pt 354.0pt 389.4pt 424.8pt 460.2pt 495.6pt 531.0pt 566.4pt 601.8pt 637.2pt 672.6pt 708.0pt 743.4pt 778.8pt 814.2pt 849.6pt 885.0pt 920.4pt 955.8pt 991.2pt 1026.6pt 1062.0pt 1097.4pt 1132.8pt 1168.2pt 1203.6pt 1239.0pt 1274.4pt 1309.8pt 1345.2pt 1380.6pt 1416.0pt; mso-layout-grid-align: none;"><font face="Times New Roman"><span style="font-size: 14pt;">(4.</span><span lang="EN-US" style="font-size: 14pt; mso-ansi-language: EN-US;">Sd</span><span style="font-size: 14pt;">7? </span><span lang="EN-US" style="font-size: 14pt; mso-ansi-language: EN-US;">Kd</span><span style="font-size: 14pt;">5!! </span><span lang="EN-US" style="font-size: 14pt; mso-ansi-language: EN-US;">5.Sb8 Kc5+! 6.Ka7 Qh7 7.Kc7 Qh2</span></font></p><font face="Times New Roman" size="3"> </font><p style="margin: 0cm 0cm 0pt; -ms-text-autospace:; tab-stops: 35.4pt 70.8pt 106.2pt 141.6pt 177.0pt 212.4pt 247.8pt 283.2pt 318.6pt 354.0pt 389.4pt 424.8pt 460.2pt 495.6pt 531.0pt 566.4pt 601.8pt 637.2pt 672.6pt 708.0pt 743.4pt 778.8pt 814.2pt 849.6pt 885.0pt 920.4pt 955.8pt 991.2pt 1026.6pt 1062.0pt 1097.4pt 1132.8pt 1168.2pt 1203.6pt 1239.0pt 1274.4pt 1309.8pt 1345.2pt 1380.6pt 1416.0pt; mso-layout-grid-align: none;"><span lang="EN-US" style="font-size: 14pt; mso-ansi-language: EN-US;"><font face="Times New Roman">8.Kb7 Qh7+! <span style="mso-spacerun: yes;"> </span>9.Ka8 Qg7 10.Sa6 Kb5 11.Sb8 Qc7 – black wins)</font></span></p><font face="Times New Roman" size="3"> </font><p style="margin: 0cm 0cm 0pt; -ms-text-autospace:; tab-stops: 35.4pt 70.8pt 106.2pt 141.6pt 177.0pt 212.4pt 247.8pt 283.2pt 318.6pt 354.0pt 389.4pt 424.8pt 460.2pt 495.6pt 531.0pt 566.4pt 601.8pt 637.2pt 672.6pt 708.0pt 743.4pt 778.8pt 814.2pt 849.6pt 885.0pt 920.4pt 955.8pt 991.2pt 1026.6pt 1062.0pt 1097.4pt 1132.8pt 1168.2pt 1203.6pt 1239.0pt 1274.4pt 1309.8pt 1345.2pt 1380.6pt 1416.0pt; mso-layout-grid-align: none;"><b style="mso-bidi-font-weight: normal;"><span lang="EN-US" style="font-size: 14pt; mso-ansi-language: EN-US;"><font face="Times New Roman">6.Sd7! Qc2+ 7.Kb7! Kd5 8.Sb8!! – and similarly =</font></span></b></p><font face="Times New Roman" size="3"> </font><p style="margin: 0cm 0cm 0pt; -ms-text-autospace:; tab-stops: 35.4pt 70.8pt 106.2pt 141.6pt 177.0pt 212.4pt 247.8pt 283.2pt 318.6pt 354.0pt 389.4pt 424.8pt 460.2pt 495.6pt 531.0pt 566.4pt 601.8pt 637.2pt 672.6pt 708.0pt 743.4pt 778.8pt 814.2pt 849.6pt 885.0pt 920.4pt 955.8pt 991.2pt 1026.6pt 1062.0pt 1097.4pt 1132.8pt 1168.2pt 1203.6pt 1239.0pt 1274.4pt 1309.8pt 1345.2pt 1380.6pt 1416.0pt; mso-layout-grid-align: none;"><span lang="EN-US" style="font-size: 14pt; mso-ansi-language: EN-US;"><font face="Times New Roman"> </font></span></p><font face="Times New Roman" size="3"> </font><p style="margin: 0cm 0cm 0pt; -ms-text-autospace:; tab-stops: 35.4pt 70.8pt 106.2pt 141.6pt 177.0pt 212.4pt 247.8pt 283.2pt 318.6pt 354.0pt 389.4pt 424.8pt 460.2pt 495.6pt 531.0pt 566.4pt 601.8pt 637.2pt 672.6pt 708.0pt 743.4pt 778.8pt 814.2pt 849.6pt 885.0pt 920.4pt 955.8pt 991.2pt 1026.6pt 1062.0pt 1097.4pt 1132.8pt 1168.2pt 1203.6pt 1239.0pt 1274.4pt 1309.8pt 1345.2pt 1380.6pt 1416.0pt; mso-layout-grid-align: none;"><span lang="EN-US" style="font-size: 14pt; mso-ansi-language: EN-US;"><font face="Times New Roman">1.Sc5? c1Q 2.Sb7 Qc6! - black wins</font></span></p><font face="Times New Roman" size="3"> </font><p style="margin: 0cm 0cm 0pt; -ms-text-autospace:; tab-stops: 35.4pt 70.8pt 106.2pt 141.6pt 177.0pt 212.4pt 247.8pt 283.2pt 318.6pt 354.0pt 389.4pt 424.8pt 460.2pt 495.6pt 531.0pt 566.4pt 601.8pt 637.2pt 672.6pt 708.0pt 743.4pt 778.8pt 814.2pt 849.6pt 885.0pt 920.4pt 955.8pt 991.2pt 1026.6pt 1062.0pt 1097.4pt 1132.8pt 1168.2pt 1203.6pt 1239.0pt 1274.4pt 1309.8pt 1345.2pt 1380.6pt 1416.0pt; mso-layout-grid-align: none;"><span lang="EN-US" style="font-size: 14pt; mso-ansi-language: EN-US;"><font face="Times New Roman">2.Se6 Ke4! - black wins</font></span></p><font face="Times New Roman" size="3"> </font><p style="margin: 0cm 0cm 0pt; -ms-text-autospace:; tab-stops: 35.4pt 70.8pt 106.2pt 141.6pt 177.0pt 212.4pt 247.8pt 283.2pt 318.6pt 354.0pt 389.4pt 424.8pt 460.2pt 495.6pt 531.0pt 566.4pt 601.8pt 637.2pt 672.6pt 708.0pt 743.4pt 778.8pt 814.2pt 849.6pt 885.0pt 920.4pt 955.8pt 991.2pt 1026.6pt 1062.0pt 1097.4pt 1132.8pt 1168.2pt 1203.6pt 1239.0pt 1274.4pt 1309.8pt 1345.2pt 1380.6pt 1416.0pt; mso-layout-grid-align: none;"><font face="Times New Roman"><span lang="EN-US" style="font-size: 14pt; mso-ansi-language: EN-US;">1.Sab6? c</span><span style="font-size: 14pt;">1</span><span lang="EN-US" style="font-size: 14pt; mso-ansi-language: EN-US;">Q</span><span style="font-size: 14pt;"> 2.</span><span lang="EN-US" style="font-size: 14pt; mso-ansi-language: EN-US;">Kd7(Sd6) Qc5! – black wins</span></font></p><font face="Times New Roman" size="3"> </font></div>