Author: Dann Corbit
Date: 01:15:02 06/22/99
Go up one level in this thread
On June 22, 1999 at 03:50:06, Dann Corbit wrote: >On June 22, 1999 at 03:44:13, Dann Corbit wrote: > >>On June 22, 1999 at 03:27:09, Andreas Stabel wrote: >> >>>On June 21, 1999 at 15:20:39, Dann Corbit wrote: >>> >>>>The complete categorization of "fool's mate": >>>>rnbqkbnr/pppp1ppp/4p3/8/5PP1/8/PPPPP2P/RNBQKBNR b KQkq f3 >>>>rnbqkbnr/pppp1ppp/4p3/8/5PP1/8/PPPPP2P/RNBQKBNR b KQkq g3 >>>>rnbqkbnr/pppp1ppp/4p3/8/6P1/5P2/PPPPP2P/RNBQKBNR b KQkq - >>>>rnbqkbnr/pppp1ppp/4p3/8/6P1/5P2/PPPPP2P/RNBQKBNR b KQkq g3 >>>>rnbqkbnr/pppp1ppp/8/4p3/5PP1/8/PPPPP2P/RNBQKBNR b KQkq f3 >>>>rnbqkbnr/pppp1ppp/8/4p3/5PP1/8/PPPPP2P/RNBQKBNR b KQkq g3 >>>>rnbqkbnr/pppp1ppp/8/4p3/6P1/5P2/PPPPP2P/RNBQKBNR b KQkq - >>>>rnbqkbnr/pppp1ppp/8/4p3/6P1/5P2/PPPPP2P/RNBQKBNR b KQkq g3 >>>>rnbqkbnr/pppp1ppp/4p3/8/5P2/7P/PPPPP1P1/RNBQKBNR b KQkq - >>>>rnbqkbnr/pppp1ppp/4p3/8/5P2/7P/PPPPP1P1/RNBQKBNR b KQkq f3 >>>>rnbqkbnr/pppp1ppp/4p3/8/8/5P1P/PPPPP1P1/RNBQKBNR b KQkq - >>>>rnbqkbnr/pppp1ppp/8/4p3/5P2/7P/PPPPP1P1/RNBQKBNR b KQkq - >>>>rnbqkbnr/pppp1ppp/8/4p3/5P2/7P/PPPPP1P1/RNBQKBNR b KQkq f3 >>>>rnbqkbnr/pppp1ppp/8/4p3/8/5P1P/PPPPP1P1/RNBQKBNR b KQkq - >>> >>>I don't understand how this can be right. My program count all terminations >>>in the usual way of generating the move tree and there are only eight >>>move sequences that lead to a mate in the first four plies. Which clearly >>>don't give fourteen distinct positions. >>Here they are with the move sequence leading to mate listed. Take a look at >>them in an EPD viewer. >> >>rnbqkbnr/pppp1ppp/4p3/8/5P2/7P/PPPPP1P1/RNBQKBNR b KQkq - id "C.A.P.581583"; acd >>4; ce 32764; pv Qh4+ g3 Qxg3#; >>rnbqkbnr/pppp1ppp/4p3/8/5P2/7P/PPPPP1P1/RNBQKBNR b KQkq f3 id "C.A.P.581584"; >>acd 4; ce 32764; pv Qh4+ g3 Qxg3#; >>rnbqkbnr/pppp1ppp/4p3/8/5PP1/8/PPPPP2P/RNBQKBNR b KQkq f3 id "C.A.P.613487"; acd >>4; ce 32766; pv Qh4#; >>rnbqkbnr/pppp1ppp/4p3/8/5PP1/8/PPPPP2P/RNBQKBNR b KQkq g3 id "C.A.P.581589"; acd >>4; ce 32766; pv Qh4#; >>rnbqkbnr/pppp1ppp/4p3/8/6P1/5P2/PPPPP2P/RNBQKBNR b KQkq - id "C.A.P.613497"; acd >>4; ce 32766; pv Qh4#; >>rnbqkbnr/pppp1ppp/4p3/8/6P1/5P2/PPPPP2P/RNBQKBNR b KQkq g3 id "C.A.P.613498"; >>acd 4; ce 32766; pv Qh4#; >>rnbqkbnr/pppp1ppp/4p3/8/8/5P1P/PPPPP1P1/RNBQKBNR b KQkq - id "C.A.P.581640"; acd >>4; ce 32764; pv Qh4+ g3 Qxg3#; >>rnbqkbnr/pppp1ppp/8/4p3/5P2/7P/PPPPP1P1/RNBQKBNR b KQkq - id "C.A.P.581753"; acd >>4; ce 32764; pv Qh4+ g3 Qxg3#; >>rnbqkbnr/pppp1ppp/8/4p3/5P2/7P/PPPPP1P1/RNBQKBNR b KQkq f3 id "C.A.P.581754"; >>acd 4; ce 32764; pv Qh4+ g3 Qxg3#; >>rnbqkbnr/pppp1ppp/8/4p3/5PP1/8/PPPPP2P/RNBQKBNR b KQkq f3 id "C.A.P.613628"; acd >>4; ce 32766; pv Qh4#; >>rnbqkbnr/pppp1ppp/8/4p3/5PP1/8/PPPPP2P/RNBQKBNR b KQkq g3 id "C.A.P.581759"; acd >>4; ce 32766; pv Qh4#; >>rnbqkbnr/pppp1ppp/8/4p3/6P1/5P2/PPPPP2P/RNBQKBNR b KQkq - id "C.A.P.613637"; acd >>4; ce 32766; pv Qh4#; >>rnbqkbnr/pppp1ppp/8/4p3/6P1/5P2/PPPPP2P/RNBQKBNR b KQkq g3 id "C.A.P.613638"; >>acd 4; ce 32766; pv Qh4#; >>rnbqkbnr/pppp1ppp/8/4p3/8/5P1P/PPPPP1P1/RNBQKBNR b KQkq - id "C.A.P.581804"; acd >>4; ce 32764; pv Qh4+ g3 Qxg3#; >Perhaps your calculations ignore e.p. status which is irrelevant. As you can >see, this lists both mates as separate if we push the pawns in opposite order. I think I see the counting difference now. I also count the 5 mates where it is necessary (but unstoppable) to take the g3 pawn to achieve mate. In other words, the mate is certain, but takes one more fullmove.
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