Author: Richard A. Fowell
Date: 08:20:14 01/19/05
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As several of you have pointed out - Chessmaster 9000 finds Mate in 9 in a few seconds. Ruffian agrees after a lot of thought (probably less than the 7.5 hrs here - I just ran it overnight: +mate 9 27/5 07:30:44 1913762K 70763 1. Bd3 Rg8 2. Qh4 h5 3. Bxg6 fxg6 4. f7 Rg7 5. Qd4 Nf5 6. Re1 Nxd4 7. Re8 Qxe8 8. fxe8=Q Rg8 9. Bxd4 A lot of engines have trouble this this one! Given all the "mate 11, mate 10, etc." solutions, it would be nice if some matefinder like Chest could confirm the best solution here, but apparently there is a large branching factor. -Richard On January 19, 2005 at 03:38:25, Richard A. Fowell wrote: >This position is from Jack Peter's chess column in last Sunday's Los Angeles >Times: >http://www.latimes.com/features/puzzles/chess/?track=mainnav-chess > >[D]rnbq1r1k/pppp1p1p/3n1Pp1/6N1/2B2Q2/8/PB3PPP/R4K1R w - - > >On my 867 MHz Mac G4, Ruffian 2.1 takes less than three minutes to claim Mate in >11, with > >+mate 11 18/2 2:25 73712484 nodes 506905 nps > >1. Nxf7 Rxf7 2. Bxf7 Qf8 3. Bxg6 Nf7 4. Qh4 Qg8 5. Bxf7 Qxf7 6. Re1 h5 7. Re8 >Kh7 8. Qe4 Qg6 9. Qe7 Kh6 10. Bc1 Qg5 11. Qg7 > >MacChess, and HIARCS take more 12 minutes to settle on Nxf7, and more than 20 >minutes >to claim a Mate score, and even then take longer to claim Mate in 11. Fruit >2.0.0 does not >even find the key move in 25 minutes. > >How do others fare - and is this really Mate in 11? > >-Richard
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