Author: Andrew Carey
Date: 05:44:31 02/13/00
Go up one level in this thread
On February 13, 2000 at 06:58:08, Enrique Irazoqui wrote: >Yesterday I found this 1965 study of Hasek, perfect for a "secret" test set, but >too beautiful to keep it hiding. I find amazing how the g pawn wins the game and >also the traveling of black's king to its original e8 square, as if in aeternal >return. > >Of the engines I tried, Nimzo is the fastest in finding 1.b6+ in 44'', followed >by Hiarcs 8 pre-alpha in 275'', F6a in 432'', and J6a in 554''. Other programs I >tried didn't solve it in less than 15 minutes on a PIII-500. Enjoy. There is no enjoyment. Only for those who believe chess computers are magic and do not understand them at all. To solve this position requires no more than: king=infinity queen=9 rook=5 bishop=nite=3 pawn=1 To solve this position relative fast requires no more than extensions on check. To solve relative faster requires no more than extensions on one-move-only reply. It is possible to work out at which depth an unintelligent material only program will solve it. Please look at Crafty source for these extension types. These have been for years now. b6+ this is a check and does not decrement depth Kxb6 Nd7+ this is check and does not decrement depth Kc6 Qa6+ this is check and does not decrement depth KxNd7 this is forced single move reply and does not decrement depth e6++ this is check and does not decrement depth Ke8 Qa8++ this is check and does not decrement depth Qe8 this is forced single move reply and does not decrement depth g6 Qxa8 g7 anymove - throwing away the queen will horizon two plys g8=Q++ Eight or nine plies of search is enough. Another two ply for final adjust to position. Each adjust is with mate threat. Six plies enough if extra extension on mate in alternate branch and nullmove mate threat detect. The position is solved with no evaluation function necessary. Computer chess is not magic even though it may seem like so to some. Please do not post positions marked as "great" to a computer chess board when the position is not interesting. Computer chess is no magic. Computer chess is quite logical. Please do not add to any test set, secret, magic or otherwise. This magic test set only will only detect for simple programs with no intelligence. This is not computer chess. All is detected by material. Not magic. Not great. Thank you. > >Enrique > >[D]1NQ5/k1p1p3/7p/pP2P1P1/2P5/2pq4/1n6/6K1 w - - 0 1 > >[Event "?"] >[Site "?"] >[Date "1965.??.??"] >[Round "?"] >[White "Hasek, J."] >[Black "Study"] >[Result "1-0"] >[Annotator ""] >[SetUp "1"] >[FEN "1NQ5/k1p1p3/7p/pP2P1P1/2P5/2pq4/1n6/6K1 w - - 0 1"] >[PlyCount "17"] > >1. b6+ (1. Qxc7+ Ka8 $11) (1. Nc6+ Kb6 2. Qb8+ Kc5 3. Qa7+ Kxc4 $19) 1... Kxb6 >2. Nd7+ Kc6 3. Qa6+ Kxd7 4. e6+ Ke8 5. Qa8+ Qd8 6. g6 Qxa8 7. g7 Qf3 8. g8=Q+ >Qf8 9. Qg2 1-0
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