Author: Mike Byrne
Date: 13:23:18 07/31/02
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On July 31, 2002 at 16:14:56, Dann Corbit wrote: >From time to time, people will post messages about moves that no computer could >ever find. Or a famous chess player will shout "No computer can find this >move!" >Well, the move by Junior to sacrifice the rook is probably the most brilliant >and dramatic computer move ever made by a PC based program. Here is the >position, and 5000 second analysis by Crafty: > >[D]r1r5/3nbpk1/4qnp1/4p1Bp/1pN1P3/1PP2Q2/4N1PP/3R1R1K b - - acd 15; acn >-1478595477; acs 5002; ce -70; pv Ra6 cxb4 Bxb4 Nc1 Ra1 Nd3 Rxd1 Rxd1 Bc3 Nc5 >Rxc5 Rd6 Qe8 Bxf6+ Nxf6 Qxf6+ Kg8 Kg1; > >Here are all of the alternatives suggested by various programs. Only Junior >suggests the rook sacrifice. *After* making the move Rxc4, and thinking for >5000 seconds, Crafty still does not see it (positive score is good for White and >bad for Black): >[D]r7/3nbpk1/4qnp1/4p1Bp/1pr1P3/1PP2Q2/4N1PP/3R1R1K w - - acd 16; acn >-1428499645; acs 5002; ce 169; pv bxc4 b3 Rd5 Nb6 Rb5 Nxc4 Rb7 Ng8 Bxe7 Nxe7 Qd3 >Ra2 Kg1 Na5 Rb8 Rc2; > >The other suggested moves all look better to Crafty after a good long think. >[D]1rr5/3nbpk1/4qnp1/4p1Bp/1pN1P3/1PP2Q2/4N1PP/3R1R1K w - - acd 14; acn >-1549106077; acs 5001; ce 51; pv cxb4 Rxb4 Rd5 Rc7 Ng3 Rb8 Rdd1 Nh7 Bxe7 Qxe7 >Rd5 Ng5 Qe3 h4 Ne2; >[D]2r5/3nbpk1/r3qnp1/4p1Bp/1pN1P3/1PP2Q2/4N1PP/3R1R1K w - - acd 15; acn >-1491400395; acs 5000; ce 48; pv cxb4 Bxb4 Nc1 Nh7 Be3 Nhf6 Nd3 Bc3 Bg5 Nh7 Nf4 >Qg4 Be7 Qxf3 Rxf3 Bd4; >[D]r1r5/3n1pk1/4qnp1/2b1p1Bp/1pN1P3/1PP2Q2/4N1PP/3R1R1K w - - acd 15; acn >-1366506792; acs 5001; ce 59; pv cxb4 Bxb4 Nc3 Nh7 Bc1 f6 Nd5 Bc5 Rd3 Ra2 Nc3 >Ra7 Nb5 Ra6 Be3 Ra2; >[D]2r5/3nbpk1/4qnp1/4p1Bp/1pN1P3/1PP2Q2/r3N1PP/3R1R1K w - - acd 15; acn >-1426777798; acs 5000; ce 110; pv cxb4 Bxb4 Nc3 Ra7 Nd5 Nxd5 exd5 Qe8 Rde1 Bxe1 >Nd6 Qf8 Qxf7+ Qxf7 Rxf7+ Kg8 Nxc8 Kxf7 Nxa7; >[D]r1r5/3nbpk1/4qnp1/4p1Bp/2N1P3/1Pp2Q2/4N1PP/3R1R1K w - - acd 15; acn >-1386374479; acs 5001; ce 87; pv Nxc3 Bc5 Na4 Ra6 Nxc5 Rxc5 Rd2 Qg4 Qe3 Rc7 Rdf2 >Re6 h3 Qxe4 Qxe4 Nxe4 Rxf7+ Kg8; > >It seems that the sacrifice is sound. In the log for Crafty, the score is >steadily dropping for the rook sacrifice move, but it looks like it might take a >week to see it. > >Full log to follow. Dann, I will be away for few days , I'll let Crafty 17.15 SEa ponder on this move while I'm gone - s/b back Saturday or Sunday with the long - good position! Adios, Mike
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