Author: Heiner Marxen
Date: 05:36:34 03/12/00
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On March 11, 2000 at 12:13:44, leonid wrote: >On March 10, 2000 at 16:34:35, José Antônio Fabiano Mendes wrote: > >>Source: >>http://www.correspondencechess.com/games/kopecg0.htm >>Kopec-Sowrey,analysis,"North Athantic Team Tournament",1990 >>[D]2r1k2r/Q1P1n1pp/1pq5/5b2/2B2n2/8/PP3PPP/K2RR3 w - - >>35.Rd8+ Rxd8 36.Rxe7+!! Kxe7 37.c8N+!! Kf6 38.Qe7+ Kg6 >>39.Bf7+ Kh6 40.Qh4+ Nh5 41.Qxh5# >>Recently people have been discussing here the underpromotion >>theme,I think this position is a worthy addition to the files. >> Enjoy,JAFM > > >Interesting position. It is curious since the "quick logic" take it and response >is instant. On LLCHESS on AMD 400Mhz time should be well beyond 0.055 sec., >since could see only zeros in time indicator. Brute force solution could take >much longer time. > >Leonid. Yes, much longer, but still fast enough for me: on a PII/550 chest 3.19 needs 12.5 seconds to verify there is no mate in 6, and 117 seconds to verify the unique key Rd8+ for the mate in 7. Curious question, leonid: is your "quick logic" just restricting the attacking side (normally white) to always say check (putting the black king "under fire") ? If so, that is what I would call "Schachfolge-Matt" in German. Can someone suggest what would be the proper English term? Many years ago I did experiment with this restriction, and found it to be very fast, but also rather limited in use. Allowing at least one quiet move would be much better. Sometime I'll try to implement that in chest. Heiner
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