Author: Vincent Diepeveen
Date: 13:29:40 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 Bf3 is indeed objectively seen a lot better for black than the seemingly piece winning gf (and therefore seen as a forcing move). So AFTER you see that gf is losing for black then Bf3 will be selected as best move. Yet i can't imagine a program where the Bf3 line is evaluated worse than other lines possible in the root. It's 0.87 evaluated by DIEP for white, at depth=5 and further getting up to 0.97 at major depths. White can chose between a very good endgame or playing further in middlegame with pawn h7 exchanged for c2. Both very good options. Personal taste probably but i'd go for the endgame with rooks on the 7th rank. >>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.
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