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Subject: Re: 14 distinct checkmate or mate in 1 positions after 3 plies (fool's mate)

Author: Dann Corbit

Date: 00:44:13 06/22/99

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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#;

• Re: 14 distinct checkmate or mate in 1 positions after 3 plies (fool's mate) Dann Corbit 00:50:06 06/22/99
  • Re: 14 distinct checkmate or mate in 1 positions after 3 plies (fool's mate) Dann Corbit 01:15:02 06/22/99

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