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  • Checkmate in 268 moves



    White to move and checkmate in 268 moves.
    The $100 version of Gothic Vortex is capable of annoucing wins in endgames from a distance of up to 268 moves. This includes the complete set of every possible way to place a total of 5 different pieces on the 10x8 board. The endgame shown above is the longest win featuring King + Queen + Pawn vs. King + Queen. The solution is shown below. Where you see an exclamation mark (!) that means the associated move is the only move to win in that position.
    1. Qe2! Qg8+ 2. Ka7! Qg7+ 3. Ka6! Qa1+ 4. Kb7 Qb2+ 5. Kc6 Qf6+ 6. Kc5 Qf5+ 7. Kd6 Qf8+ 8. Kd7! Qf7+ 9. Qe7 Qd5+ 10. Qd6! Qb7+ 11. Ke6 Qe4+ 12. Kf6 Qf3+ 13. Ke5 Qe2+ 14. Kf5 Qf3+ 15. Qf4 Qd5+ 16. Kf6 Qc6+ 17. Ke5 Qb5+ 18. Ke4 Qb1+ 19. Ke3 Qe1+ 20. Kd3 Qc1 21. Ke2 Qc2 22. Ke3 Qc1 23. Kf2 Qc2 24. Kg3 Qg6+ 25. Kf3 Qd3+ 26. Qe3 Qf5+ 27. Kg3 Qi5+ 28. Kg4 Qi6+ 29. Kf4 Qf6+ 30. Kg3! Qj6+ 31. Kf3! Qi6+ 32. Kf2 Qi5+ 33. Ke2 Qb5+ 34. Ke1 Qb1+ 35. Kf2 Qa2 36. Kg3 Qg8+ 37. Kf4 Qj8+ 38. Kf5 Qf8+ 39. Ke6 Qc8+ 40. Kd6 Qd8+ 41. Kc6 Qa8+ 42. Kb5 Qb7+ 43. Ka5 Qa8+ 44. Kb4 Qb7+ 45. Ka3 Qa6+ 46. Kb2 Qb5+ 47. Qb3 Qe5+ 48. Qc3! Qb5+ 49. Ka3 Qa6+ 50. Kb4 Qb6+ 51. Kc4 Qc6+ 52. Kd4 Qd6+ 53. Ke4 Qg6+ 54. Kd5 Qg8+ 55. Kc5 Qc8+ 56. Kd4 Qg8 57. Qc6+ Ki2 58. Qd7+! Ki3 59. Kc3 Qa2 60. Qd6 Qa1+ 61. Kc4 Qc1+ 62. Kb5 Qb1+ 63. Qb4 Qd3+ 64. Kc6! Ki2 65. Qi4+ Kh2 66. Qh5+! Kg1 67. Qd5! Qa6+ 68. Kd7! Qa7+ 69. Ke6! Qb6+ 70. Kf5 Qf2+ 71. Ke5 Qe2+ 72. Kf6 Qf2+ 73. Ke7 Qa7+ 74. Qd7 Qc5+ 75. Qd6! Qg5+ 76. Ke6 Qg6+ 77. Kd7! Qg4+ 78. Kc6 Qa4+ 79. Kb7 Qe4+ 80. Kb6 Qb1+ 81. Ka6 Qa2+ 82. Kb7 Qf7+ 83. Kc6 Qf3+ 84. Qd5 Qf6+ 85. Kc5 Qa6 86. Kb4! Kf2 87. Qb5! Qe6 88. Kc3! Kf3 89. Qd3+ Kg2 90. Qc4! Qe1 91. Qg4+ Kh2 92. Qf4+ Kg2 93. Kb2 Qe2 94. Qi4+ Kh2 95. Qh4+ Ki2 96. Kc2 Kj3 97. Kc3 Qf3+ 98. d3 Qe3 99. Qd4 Qh6 100. Qd5 Qe3 101. Kc4 Qa7 102. Qc5 Qa2+ 103. Kc3! Qa1+ 104. Kd2 Qa2+ 105. Ke3 Qe6+ 106. Kd4 Qg4+ 107. Kc3! Qg3 108. Qf5 Qc7+ 109. Kd2 Qd6 110. Ke3 Qh6+ 111. Ke4 Qc6+ 112. Qd5 Qg6+ 113. Kf3 Qf6+ 114. Ke2 Qj2+ 115. Ke3 Qe7+ 116. Kd4 Qh4+ 117. Kc5 Qe7+ 118. Kb6 Qf6+ 119. Kb5 Qb2+ 120. Kc6 Qc3+ 121. Kd7 Qg7+ 122. Ke8 Qh8+ 123. Ke7 Qh4+ 124. Kd7 Qh3+ 125. Kc7 Qg3+ 126. Kc6 Qg6+ 127. Kc5 Qa6 128. Qf3+ Ki4 129. Qg4+ Ki5 130. Qd7 Qa5+ 131. Qb5! Qc7+ 132. Kd5 Qd8+ 133. Ke6+! Ki4 134. Qd5 Qg8+ 135. Ke5 Qg5+ 136. Kd4 Qg7+ 137. Kc4 Qc7+ 138. Qc5 Qf7+ 139. Kc3 Qf3 140. Qd6 Kh3 141. Qe6+! Kg3 142. Kc4 Qf1 143. Qg8+! Kh4 144. Qd5! Kg4 145. Kb5! Kg3 146. Qg5+ Kh2 147. Qe3 Kg2 148. Kb4 Qb1+ 149. Kc5! Qc2+ 150. Kd6! Qc8 151. d4 Qd8+ 152. Kc5 Qc7+ 153. Kb4 Qb6+ 154. Kc3 Qa5+ 155. Kc4 Qa6+ 156. Kc5 Qa5+ 157. Kc6 Qa8+ 158. Kd7 Qd5+ 159. Ke7 Qb7+ 160. Kf8 Qb8+ 161. Kg7 Qc7+ 162. Kg6 Qc6+ 163. Kg5 Qa8 164. Qe2+ Kg1 165. Qe5 Qj8+ 166. Kg6 Qj6+ 167. Kf7 Qj3+ 168. Ke7 Qi3+ 169. Kd7 Qh3+ 170. Kc7 Qc3+ 171. Qc5 Qg3+ 172. Qd6 Qc3+ 173. Kd7 Qh3+ 174. Kc6 Kh1 175. d5 Qh8 176. Kb5 Qh7 177. Kb6 Qh8 178. Qe7 Qb2+ 179. Kc6 Qc2+ 180. Qc5 Qe4 181. Kb6 Qb1+ 182. Qb5 Qg6+ 183. Kc5 Qf5 184. Qe2 Ki1 185. Qe1+ Kh2 186. Qh4+ Ki1 187. Kd4 Qf1 188. Qg3+ Kj2 189. Qj6+ Ki1 190. Qi6+ Kj2 191. d6 Qa1+ 192. Kd5 Qa8+ 193. Ke5 Qb8 194. Qj5+ Ki2 195. Qg2+ Ki1 196. Qc6 Qh8+ 197. Ke6 Qh3+ 198. Ke7 Qh4+ 199. Kd7 Qh7+ 200. Kc8 Qg8+ 201. Kc7 Qg3 202. Qc4 Ki2 203. Qb4 Qe5 204. Kc6 Qe6 205. Qb2+ Ki1 206. Qc1+ Ki2 207. Qi7+ Kj3 208. Qj7+ Ki4 209. Kc7 Qc4+ 210. Kd8! Qg8+ 211. Kd7 Qg3 212. Qe7 Kj4 213. Qj2+ Ki5 214. Qd2 Ki6 215. Kc6 Qf3+ 216. Kc7 Qf5 217. Qe2+ Kj6 218. Qc4 Qa5+ 219. Kb7 Qf5 220. Qc6 Qb1+ 221. Kc7 Qi1 222. Qd5 Ki6 223. Qf5 Kj6 224. Kd7 Qg3 225. Ke6 Qb3+ 226. Kf6 Qi3+ 227. Kf7 Qi7+ 228. Kf8 Qh8+ 229. Ke7 Qi7+ 230. Qf7 Qc1 231. Qf6+ Ki7 232. d7 Qc5+ 233. Ke8 Qb5 234. Qc3 Ki8 235. Ke7 Qg5+ 236. Kd6 Qh6+ 237. Kc7 Qf4+ 238. Kb7 Qe4+ 239. Kb6 Qb1+ 240. Kc7 Qi1+ 241. Kc8 Qi2 242. Qd3+ Kj8 243. Qg6 Qh3 244. Qg8+ Ki7 245. Qg7+ Kj6 246. Qf6+ Ki5 247. Kc7 Qh7 248. Qd4 Ki6 249. Kb7 Kj7 250. Ka8 Qh1+ 251. Ka7 Qh7 252. Qd1+ Ki7 253. Qc1+ Kj6 254. Qc7 Qh8 255. d8Q Qa1+ 256. Kb8 Qb1+ 257. Qb6+ Qxb6+ 258. Qxb6+! Ki5 259. Qb4 Ki6 260. Qi4+ Kh6 261. Kc7 Kg5 262. Kc6 Kf6 263. Qh5 Kg7 264. Kd5 Kf6 265. Kd6 Kg7 266. Ke6 Kg8 267. Kf6 Kf8 268. Qh8# checkmate
    Of course, there are many other interesting endgames in the 5-piece tablebase. Some of them are shown below.
    Checkmate in 265 moves



    White to move and checkmate in 265 moves.
    This endgame represents the longest known win on the 80-square board featuring only pawns. Before this endgame could be computed, every other endgame had to be resolved first, since each pawn could potentially promote to a different type of piece. The quickest win and the most resilient defense occur when the pawns promote to Queens, as shown in the solution below. As before, each exclamation mark indicates that particular move is the only move to preserve the win going forward.
    1. i6! e3 2. i7! e2 3. i8=Q! e1=Q 4. Qg6! Qb4+ 5. Kc6! Qc4+ 6. Kd7! Qd5+ 7. Ke8 Qe5+ 8. Kf7 Qf4+ 9. Ke6 Qe3+ 10. Kf5 Qf2+ 11. Ke5 Qe3+ 12. Qe4 Qg5+ 13. Ke6 Qg8+ 14. Kf5 Qi8+ 15. Kf4 Qi1+ 16. Kf3 Qf1+ 17. Kg3 Qh1 18. Kf2 Qh2 19. Ke3 Qg1+ 20. Ke2 Qh2 21. Kd3 Qd6+ 22. Ke3 Qg3+ 23. Qf3 Qe5+ 24. Kd3 Qb5+ 25. Kd4 Qb6+ 26. Ke4 Qe6+ 27. Kd3! Qa6+ 28. Ke3! Qb6+ 29. Ke2 Qa6+ 30. Ke1 Qe6+ 31. Kf1 Qj1+ 32. Ke2 Qj2 33. Kd3 Qd8+ 34. Ke4 Qe8+ 35. Kf5 Qi8+ 36. Kg5 Qj8+ 37. Kg6 Qg8+ 38. Kh6 Qj8+ 39. Ki5 Qi7+ 40. Kh5 Qh7+ 41. Ki4 Qi7+ 42. Kh3 Qh6+ 43. Ki2 Qi5+ 44. Qi3 Qf5+ 45. Qh3! Qi5+ 46. Kj3 Qj6+ 47. Ki4 Qi6+ 48. Kh4 Qh6+ 49. Kg4 Qg6+ 50. Kf4 Qd6+ 51. Kg5 Qd8+ 52. Kh5 Qh8+ 53. Kg4 Qd8 54. Qh6+ Kb2 55. Qg7+! Kb3 56. Qg6 Qh8 57. Kg5 Qe5+ 58. Kh4 Qh2+ 59. Ki5 Qi1+ 60. Qi4 Qg3+ 61. Kh6! Kb2 62. Qb4+ Kc1 63. Qc5+! Kd1 64. Qg5! Qj6+ 65. Kg7! Qj7+ 66. Kf6! Qi6+ 67. Ke5 Qe2+ 68. Kf5 Qf2+ 69. Ke6 Qe2+ 70. Kf7 Qj7+ 71. Qg7 Qh5+ 72. Qg6! Qd5+ 73. Kf6 Qd8+ 74. Kg7 Qd4+ 75. Kh6 Qj4+ 76. Ki7 Qf4+ 77. Ki6 Qi1+ 78. Kj7 Qj2+ 79. Ki7 Qe7+ 80. Kh6 Qe3+ 81. Qg5 Qe6+ 82. Kh5 Qj6 83. Ki4! Ke2 84. Qi5! Qf6 85. Kh3! Kd3 86. Qg3+! Kd2 87. Qh4! Qf1 88. Qd4+ Kc2 89. Qe4+ Kd2 90. Ki2 Qf2 91. Qb4+ Kc2 92. Qc4+ Kb2 93. Kh2 Ka1 94. Qg4 Kb2 95. Qe4 Qd2 96. Kh3 Qh6+ 97. Qh4! Qe3+ 98. g3 Kb3 99. Qf4 Qd3 100. Qf7+ Kc2 101. Qa2+ Kd1 102. Qe6! Kc2 103. Kg4 Qd1+ 104. Kg5! Qd8+ 105. Kf5 Qf8+ 106. Qf6 Qi5+ 107. Qg5! Qf8+ 108. Ke4 Qe8+ 109. Kf4! Qa4+ 110. Ke3! Qa7+ 111. Kf3 Qa8+ 112. Kf2 Qa7+ 113. Kg2 Qa8+ 114. Kh2 Qh8+ 115. Qh4! Qe5 116. Qc4+ Kb2 117. Qf4 Qh5+ 118. Kg2 Qd5+ 119. Kf2 Qc5+ 120. Ke2 Qb5+ 121. Ke3 Qb3+ 122. Kf2 Qc2+ 123. Ke1 Qb1+ 124. Ke2 Qc2+ 125. Qd2 Ka1 126. Ke3 Qb3+ 127. Qd3 Qe6+ 128. Qe4 Qb3+ 129. Kf4 Qf7+ 130. Qf5 Qi7+ 131. Qg5 Qf7+ 132. Ke3 Qe6+ 133. Kf3 Qf7+ 134. Kg2 Qi4+ 135. Kh2 Qj4+ 136. Qi3 Qe4 137. Qh4 Qc2+ 138. Kh3 Qd3 139. Qe7 Qc3 140. Kh4 Qh8+ 141. Ki3 Qg8 142. Kh2 Qg4 143. Qh4 Qe2+ 144. Ki3 Qi6+ 145. Kh3 Qj5+ 146. Kh2 Qe5 147. Ki3 Qe3 148. Qf6+ Ka2 149. Qf4 Qg1+ 150. Ki4 Qg2+ 151. Ki5 Qh2 152. Ki6 Kb2 153. Qd4+ Kc2 154. g4 Qi3+ 155. Kh6 Qh4+ 156. Kg6 Qi4+ 157. Kf6 Qi6+ 158. Ke5 Qi5+ 159. Ke6 Qi6+ 160. Kd7 Qh7+ 161. Kc6 Qg6+ 162. Kc5 Qe8 163. Qf2+ Kd3 164. Qg3+ Kd2 165. g5 Qc8+ 166. Kd5 Qa8+ 167. Kd4 Qa4+ 168. Ke5 Qe8+ 169. Kf4 Qf7+ 170. Kg4 Qd7+ 171. Kh5 Qj7+ 172. Ki4 Qi8+ 173. Qi5 Qe4+ 174. Qh4 Qi8+ 175. Kj3 Qj7+ 176. Ki3 Qi7+ 177. Kh2 Qc7+ 178. Ki2 Qd7+ 179. Qh3 Qi7+ 180. Qi3! Qd7+ 181. Ki1 Qf7 182. Qh2+ Ke3 183. Qh6 Qf4+ 184. Ki2 Ke4 185. Qc6+! Kd3 186. Qd7+ Kc3 187. Qg7+ Kb3 188. g6 Qi4+ 189. Kj2 Qh4+ 190. Kj3 Ka3 191. Qa7+ Kb2 192. Qh7 Qg3+ 193. Kj4 Qg1+ 194. Kj5 Qf1+ 195. Ki6 Qi4+ 196. Kj7 Qj4+ 197. Ki8 Qi5+ 198. Qi7 Qf5 199. Qi4 Qf8+ 200. Kh7 Qf5 201. Kh6 Qf6 202. Qi2+ Ka1 203. Qh1+ Kb2 204. Qb7+ Ka3 205. Qa7+ Kb4 206. Kh7 Qh4+ 207. Kg8! Qd8+ 208. Kg7 Qd3 209. Qf7 Ka4 210. Qa2+ Kb5 211. Qg2 Kb6 212. Kh6 Qe3+ 213. Kh7 Qe5 214. Qf2+ Ka6 215. Qh4 Qj5+ 216. Ki7 Qe5 217. Qh6 Qi1+ 218. Kh7 Qb1 219. Qg5 Qc2 220. Qe5 Ka7 221. Qe8 Qh2+ 222. Kg8 Qh5 223. Qe7+ Kb8 224. Qd6+ Ka8 225. g7 Qj5+ 226. Kf7 Qf5+ 227. Qf6 Qh5+ 228. Qg6 Qd5+ 229. Kf8 Qc5+ 230. Kg8 Qe5 231. Qh6 Kb8 232. Qh3 Qe4 233. Kh8 Qe5 234. Kh7 Qe4+ 235. Ki7 Qf4+ 236. Ki6 Qi1+ 237. Kh7 Qb1+ 238. Kh8 Qb2 239. Qg3+ Ka8 240. Qd6 Qc3 241. Qd8+ Kb7 242. Qd7+ Ka6 243. Qe6+ Kb5 244. Kh7 Qc7 245. Qg4 Kb6 246. Ki7 Ka7 247. Kj8 Qc1+ 248. Kj7 Qc7 249. Qg1+ Ka6 250. Qg6+ Ka5 251. Qh7 Qi1 252. g8=Q Qd1+ 253. Ki8 Qi1+ 254. Qi7 Qxi7+ 255. Kxi7 Kb4 256. Qj5 Ka4 257. Qc5 Kb3 258. Kh6 Kb2 259. Kg6 Ka2 260. Qb5 Ka1 261. Kf5 Ka2 262. Ke4 Ka1 263. Kd3 Ka2 264. Kc2 Ka1 265. Qb2# checkmate
    Send an email to Ed Trice if you want to buy the $100 version of the program that has all of the 5-piece tablebase endgames included.

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