Author: Dann Corbit
Date: 15:30:30 12/22/99
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On December 22, 1999 at 18:16:02, Graham Laight wrote: >On December 22, 1999 at 14:10:56, Dann Corbit wrote: > >>Have a look at this tremendous checkmate Chest found from the famous 1924 New >>York Chess Club championship: >>2r3k1/5ppp/7r/Q7/3P1p2/1N3Pnq/PP3K1P/R5R1 b - - acd 10; acn 535351375; acs >>15279; bm Ne4+; ce 32750; dm 9; id "C.A.P. 812153"; pv Ne4+ fxe4 Qe3+ Kf1 Rxh2 >>Rxg7+ Kxg7 Qe5+ f6 Qe7+ Kg6 Qxf6+ Kxf6 e5+ Kg6 e6 Qf2#; >> >>I will be amazed if any general purpose program (or even most GM's) can find it. > >Could somebody please either explain the notation to me or post the position in >the more common notation, please? The position is this piece: 2r3k1/5ppp/7r/Q7/3P1p2/1N3Pnq/PP3K1P/R5R1 b - - Which is pretty much the same as FEN. A number is a count of empty squares. A letter is a piece with lower-case/upper-case representing white/black. The b means that black is to move. The dashes show that neither side can castle and there are no e.p. squares vulnerable. acd is depth = 10 plies acn is count of nodes examined by the program acs is seconds of computation bm is best move ce is centipawn evaluation. A checkmate is -32767 and any value over 32000 in absolute value indicates distance to mate. Negative numbers mean you are going to get mated and positive numbers mean you are going to mate. dm is the direct mate move count id is the identifier for this position pv is the preferred variation, which is what we think is going to happen if both sides try their best. You can look up all this stuff in intricate detail by a web search for Steven J. Edwards PGN Standard
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