Author: F. Huber
Date: 07:48:23 01/09/05
Go up one level in this thread
On January 09, 2005 at 09:28:15, Matthew Hull wrote: >Composed by J. N. Babson, Seattle, Washington, in 1878. > >Black -- 16 pieces >White -- 16 pieces > >Either White or Black to play and checkmate, or compel his adversary to >checkmate in eleven moves. > >[D]Nb1QN3/1pp1PPp1/1rnn1p1P/1Pkr2B1/P1pRpK1p/2P1P2B/2qb2Pp/4R3 w - - 0 1 Hi Matthew, that´s really an amazing position! I´ve now checked all 4 cases and can confirm three of them: Nb1QN3/1pp1PPp1/1rnn1p1P/1Pkr2B1/P1pRpK1p/2P1P2B/2qb2Pp/4R3 b - - bm #11; 00:00 @ C3/K5/P3/X6; Nb1QN3/1pp1PPp1/1rnn1p1P/1Pkr2B1/P1pRpK1p/2P1P2B/2qb2Pp/4R3 w - - bm s#11; 00:00 @ C1/K2/P2/X2; Nb1QN3/1pp1PPp1/1rnn1p1P/1Pkr2B1/P1pRpK1p/2P1P2B/2qb2Pp/4R3 b - - bm s#11; 00:02 @ C1/K5/P3/X4; So both selfmates in 11 are ok, and also the mate in 11 if it´s blacks turn - but if white has to move it seems to be only a mate in 12!? Nb1QN3/1pp1PPp1/1rnn1p1P/1Pkr2B1/P1pRpK1p/2P1P2B/2qb2Pp/4R3 w - - bm #12; 00:00 @ C3/K4/P2/X3; I´ve tested this with Chest, King and GoliathMate - Gustav failed because it doesn´t accept this position as legal. Of course I´ve not tried it yet with Chest in brute-force mode (this would take too long on my slow notebook), but I´m quite sure that this #12 is indeed the shortest possible. But if you have a solution in 11 moves, please post the mainline here - maybe then I could check it again with Chest. Regards, Franz.
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