Author: Bruce Moreland
Date: 13:15:27 01/12/00
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On January 12, 2000 at 13:43:10, Bruce Moreland wrote: >On January 12, 2000 at 10:02:08, Vincent Diepeveen wrote: > >>Let's zoom into position #8 not found by Deep Thought >> >[D]r3rbk1/ppq2ppp/2b1pB2/8/6Q1/1P1B3P/P1P2PP1/R2R2K1 w - - bm Bxh7; 8 >> >>This position is of course in nolot as PC programs don't extend such >>lines too deeply. Just like the other nolots it only has to do with >>king safety and a lot of forced moves around the king. >> >>[c] ==> check extension >>[s] ==> singular best move extension >>[f] ==> forced move (a forced move is singular too) extension >> >>the TACTICAL line needed to find Bxh7: >> >>Bxh7+ Kxh7[c] >>Qh5+ Kg8[c] >>Rd4[s] gf6[f] > >Hsu points out that gxf6 is bad, and suggests that Bf3! holds. > >bruce > >>Rg4+[s] Bg7[c] >>Qh6[s] Kf8[f] >>Rxg7 Rec8 >>Qxf6 Be4[f] (otherwise rh7-h8 mate) >>Rae1[s] Bf5[f] >>g4[s] Bxc2[f] >>Rxe6[f] Bd3 >>Rg6[c] Qc1+ >>Kh2[c] Qc7+ >>f4[c] Qc2+ >>Kg3[c] <any legal move> >>Qh8 mates in quiescencesearch. Mine finds this now. The line in ply 15 after 2.5 hours is: +0.75 Bxh7+ Kxh7 Qh5+ Kg8 Rd4 Bf3 gxf3 Qxc2 Rd7 Qg6+ Qxg6 fxg6 Bg5 b6 Rad1 Bc5 Kf1 a6 Ke2 Kh7 Bf6 Rg8 a4 I haven't checked the line, and I don't promise that it is convincing or accurate. bruce
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