Author: Robert Sherman
Date: 12:03:42 11/14/98
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On November 14, 1998 at 09:42:50, Chris Janeke wrote: >The following line was published on one of the rec. chess groups about a year >ago. Although the line is definitely not sound against accurate counterplay, >I've had succees with it in 5 minute blitz games against heavy weights such as >Crafty 15.20, Phalanx 18, Gnuchess, Gromit, Exchess, Ychess, Rebel Decade2.0, >Mirage, Rookie, Zchess .. the list goes on (but neither Chessmaster 6000 nor >Fritz 5 appear to fall for it). > >Here is my win against Crafty 15.20 (Pentium 133Mhz, 32 Meg Ram and using the >5,7 meg book bin file for Crafty - which is available at the crafty download >site - and no tablebases). > >1 e4 e5 2 Nf3 Nc6 3 Bc4 Nf6 4 Nc3 Nxe4 5 Nd5 Bc5 6 d3 Nxf2 7 Qe2 Nxh1 8 Ng5 0-0 >9 Nxc7 Qxc7 10 Qh5 Bf2 11 Kf1 h6 12 Bxf7+ Kh8 13 Qg6 Ng3+ 14 hxg3 hxg5 15 Qh5# > >A I recall, the critical moment is after 9 Nxc7 where if black does not take >the knight, white's game falls apart. Of course, after 9 ..Qxc7, black can no >longer prevent the mate. It seems however that many chess programs are just too >greedy to explore the consequences of taking the knight fully. Actually I posted this game on CCC last year under the title "How to beat Rebel 9 in 16 moves." The game was slightly different due to transpositions and an extra move coming from the queen check on a5. The game was at tournament time controls but on a Pentium 100mhz computer. Rebel has in its algorithm a quick take back feature (bug?) that allowed the win. I found out from replies to my post at the time that Rebel will see the folly in taking the knight on a 200mhz+ computer. Although the problem is rare due to the speed of today's computers, I still think that Ed Schroder should program Rebel to differentiate between a sac and an obvious takeback.
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