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問題 990340: 黒 が 終盤を勝つとするために

IM Vladimir Demin (2430) - IM Alexey Averjanov (2399)
Titled Tue 4th Oct Early chess.com INT (7), 2022.10.04
  2. 1.d4
  3. d5
  4. 2.Bf4
  5. Nf6
  6. 3.Nc3
  7. a6
  8. 4.e3
  9. e6
  10. 5.g4
  11. c5
  12. 6.g5
  13. Nfd7
  14. 7.Bg2
  15. Nc6
  16. 8.Nge2
  17. Be7
  18. 9.h4
  19. b5
  20. 10.Ng3
  21. Bb7
  22. 11.Qd2
  23. Qb6
  24. 12.h5
  25. cxd4
  26. 13.Nce2
  27. dxe3
  28. 14.Bxe3
  29. Bc5
  30. 15.O-O-O
  31. O-O-O
  32. 16.Kb1
  33. Rhe8
  34. 17.g6
  35. hxg6
  36. 18.hxg6
  37. fxg6
  38. 19.Rh7
  39. Re7
  40. 20.Bh3
  41. Nce5
  42. 21.Bg5
  43. Nf6
  44. 22.Bxf6
  45. gxf6
  46. 23.Rxe7
  47. Bxe7
  48. 24.Nd4
  49. f5
  50. 25.Qe2
  51. Bf6
  52. 26.f4
  53. Nc4
  54. 27.Qxe6+
  55. Qxe6
  56. 28.Nxe6
  57. Re8
  58. 29.Nc5
  59. Bxb2
  60. 30.Nxb7
  61. Kxb7
  62. 31.Bg2
  63. Ne3
  64. 32.Rxd5
  65. Nxg2
  66. 33.Kxb2
  67. Nxf4
  68. 34.Rd7+
  69. Kc6
  70. 35.Rf7
  71. Re1
  72. 36.Rf6+
  73. Kc5
  74. 37.Rxa6
  75. b4
  76. 38.a3
  77. bxa3+
  78. 39.Rxa3
  79. Kd4
  80. 40.Ra5
  81. Rg1
  82. 41.Nxf5+
  83. gxf5
  84. 42.Rxf5
  85. Ke4
  86. 43.Rf8
  87. Nd5
  88. 44.Re8+
  89. Kd4
  90. 45.Rh8
  91. Rg2
  92. 46.Rh4+
  93. Kc5
  94. 47.Rh5
  95. Re2
  96. 48.Rg5
  97. Rd2
  98. 49.Rh5
  99. Rd4
  100. 50.Rg5
  101. Kc4
  102. 51.Rh5
  103. Nb4
  104. 52.Rh2
  105. Rg4
  106. 53.Rf2
  107. Rh4
  108. 54.Rg2
  109. Re4
  110. 55.Rh2
  111. Nd5
  112. 56.Rh8
  113. Re2
  114. 57.Rc8+
  115. Kd4
  116. 58.Rd8
  117. Re5
  118. 59.Rd7
  119. Re6
  120. 60.Rd8
  121. Rb6+
  122. 61.Kc1
  123. Kc4
  124. 62.Kd2
  125. Nb4
  126. 63.Rc8+
  127. Kb5
  128. 64.Kc3
  129. Nd5+
  130. 65.Kd2
  131. Nb4
  132. 66.Kc3
  133. Nc6
  134. 67.Rh8
  135. Ra6
  136. 68.Rh5+
  137. Kb6
  138. 69.Rg5
  139. Ra3+
  140. 70.Kb2
  141. Rf3
  142. 71.Rg2
  143. Re3
  144. 72.Rh2
  145. Ne5
  146. 73.Rh8
  147. Kc5
  148. 74.Rc8+
  149. Nc6
  150. 75.Kc1
  151. Kd5
  152. 76.Kd2
  153. Rh3
  154. 77.Rg8
  155. Ne5
  156. 78.Kc1
  157. Kd4
  158. 79.Rg2
  159. Kc3
  160. 80.Kb1
  161. Nc4
  162. 81.Ka2
  163. Nd2
  164. 82.Rg8
  165. Kxc2
  166. 83.Rc8+
  167. Kd3
  168. 84.Rd8+
  169. Kc3
  170. 85.Rc8+
  171. Nc4
  172. 86.Rg8
    1. 解決策:86.Rg8
    2. Rh2+ 黒のルークが、マス a3を守っている白のキングを攻撃します。
    3. 87.Kb1
      1. 87.Ka1 with a winning endgame, for example:
      2. Rh6
      3. 88.Rg3+
      4. Kc2
      5. 89.Rg2+
      6. Nd2
      7. 90.Rg3
      8. Ra6+
      9. 91.Ra3
      10. Rxa3#
      1. 87.Rg2
      2. Rxg2+
    5. 87...Na3+
      1. 87...Nd2+
      2. 88.Ka2
        1. 88.Ka1
        2. Nb3+
        3. 89.Kb1
        4. Rb2#
        1. 88.Kc1
        2. Rh1+
        3. 89.Rg1
        4. Rxg1#
      4. 88...Nc4+
      5. 89.Kb1
        1. 89.Ka1 with a winning endgame, for example:
        2. Rh6
        3. 90.Rg3+
        4. Kc2
        5. 91.Rg2+
        6. Nd2
        7. 92.Rg3
        8. Ra6+
        9. 93.Ra3
        10. Rxa3#
        1. 89.Rg2
        2. Rxg2+
      1. 87...Rh1+
      2. 88.Ka2
        1. 88.Rg1
        2. Rxg1+
      4. 88...Rh2+
      5. 89.Kb1
        1. 89.Ka1 with a winning endgame, for example:
        2. Rh6
        3. 90.Rg3+
        4. Kc2
        5. 91.Rg2+
        6. Nd2
        7. 92.Rg3
        8. Ra6+
        9. 93.Ra3
        10. Rxa3#
        1. 89.Rg2
        2. Rxg2+
    7. 88.Ka1
      1. 88.Kc1
      2. Rh1+
      3. 89.Rg1
      4. Rxg1#
    9. 88...Nc2+
    10. 89.Ka2
      1. 89.Kb1
      2. Rh1+
      3. 90.Rg1
      4. Rxg1+
    12. 89...Nb4+ ダブルチェック
    13. 90.Ka1 with a winning endgame, for example:
      1. 90.Ka3
      2. Ra2#
      1. 90.Kb1
      2. Rh1+
      3. 91.Rg1
      4. Rxg1#
    15. 90...Rh1+
    16. 91.Rg1
    17. Rxg1#
  174. 86...Rh2+
  175. 87.Ka1
  176. Kb3
  177. 88.Rg3+
  178. Kb4
  179. 89.Kb1
  180. Rd2
  181. 90.Kc1
  182. Rf2
  183. 91.Rg4
  184. Kb3
  185. 92.Kd1
  186. Ne3+
  187. 93.Ke1
  188. Rc2
  189. 94.Rg3
  190. Rc3
  191. 95.Ke2
  192. Nd5
  193. 96.Rxc3+
  194. Nxc3+
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