OFFSET
1,1
COMMENTS
After n = 33, all terms are 0 so the sequence ends at n = 33.
GBR code is 0011. Longest checkmate under perfect play is in 33 (FEN 8/8/7N/8/8/8/8/K1k1B3 w - - 0 1). For path of moves, see k4it-link. Data is found using Kryukov link, "Endgame Tablebases online". FEN is found in Kryukov link, "Longest checkmates in chess".
The listed examples, or more generally up to 6 man positions can be examined using the k4it link.
REFERENCES
Christian Posthoff, Günter Reinemann, Computerschach-Schachcomputer, Akademie-Verlag Berlin 1987, p. 52.
LINKS
S. T. Dekker and H. J. van den Herik, GBR class 0011: a 33-move endgame, EG 78, 1984, p. 345-7.
Steven J. Edwards, Endgame tablebase position count summaries, 1994.
K. Kryukov, Endgame Tablebases Online
K. Kryukov, Longest checkmates in chess
Wikipedia, GBR code
CROSSREFS
KEYWORD
nonn,fini,full
AUTHOR
David A. Corneth, Jul 02 2016
EXTENSIONS
Data and comments changed by Vaclav Kotesovec, Aug 01 2016
STATUS
approved