Author: Vincent Diepeveen
Date: 13:40:56 01/12/00
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On January 12, 2000 at 16:15:27, Bruce Moreland wrote: >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. This line is very good. it's the endgame i'm talking about. the endgame that white can't lose. white has good winning chances though in it. black is struggling for small drawing chances there. I remember some GMs in history that would win endgames like this in a way that it would be put in books to learn how to chanceless and technically win it. >bruce
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