Author: Robert Hyatt
Date: 19:20:59 01/19/98
Go up one level in this thread
On January 19, 1998 at 18:42:00, Amir Ban wrote: > >Here are some more comments on positions 101 thru 150. Once again, >cross-checking is needed and welcome. > >No. 112 (Qc6): > >This one's correct, and also difficult and subtle. Black is a piece up >but what to do about the threat of perpetual Ng5+ ? Qc6 throws a piece >and gets it back like this: Qc6 Qxe5 Bb7 Re1 Kh8!! Amazing. > >Recommend: No change. > > I don't get this in 20 secs. I get Qd5 Ng5 with a perpetual from the beginning.. >No. 115 (Nxh7): > >Correct and difficult. > >Recommend: No change. I get Nh7 in 7 seconds with a draw score. Keep draw score thru 20 seconds at least... > > >No. 117 (Ne7+): > >The key move is a 1-ply combination, but Ra7 is much stronger and neat. > >Recommend: Change key to Ra7 I get +2.6 for Ne7 instantly... at 26 secs I get Ra7 +4.0... it fails high at depth 13 again... Only thing I don't like is that Ne7 probably wins... so we have two decent moves to choose from, which leaves me a little suspicious of the position... > > >No. 123 (Nxd6): > >The key move is not really satisfactory, I think. Stronger is Bxe5. If >dxe5 Nh4 and if Rxe5 Nd7 both win a piece. > >Recommend: Change key to Bxe5. I get Bxe5 at .46 seconds and hold it... after 10 plies it is +1.64 > > >No. 130 (Rxe7): > >I nearly wrote off this one as incorrect, but it works: Rxe7 Qxe7 Qf3 >Kg7 Nce4 dxe4 Nxe4 Qe6 Bxf6+ Kg8 Qf4! wins. Should be quite difficult. > >Recommend: No change. > > >No. 131 (c5): > >I get g4 Bg6 c5 etc. It looks like a transposition since after c5 Nxd5 >white should play g4 immediately or the next move. > >Recommend: Add g4 as side solution. > this one looks ambiguous. I get several different moves here, none seriously better than the other (ie g4, dxc6, and probably others) > >No. 133 (Rxe4): > >Seems correct, though the score is unconvincing. > >Recommend: No change. More analysis please. > > >No. 137 (c6): > >c6 doesn't look like it really works. Anyway I get Qe2 which is more >convincing. > >Recommend: Change key to Qe2. I get +2 for Qe2 also... question is is that convincing enough... > > >No. 142 (d3+): > >I don't see the point to the key. d3+ Kh1 and then what ? I tried Qa1 >and Qf2 but they fail. > >Recommend: Get rid of it. I don't find anything here either... > > >No. 145 (Bd4+): > >Bd4+ does something, but is a waste of energy. I find Rf2! an original >way to guard the rook which incidentally wins a piece. > >Recommend: Change key to Rf2. ditto if Bd4 doesn't get way better deeper. I get rf2 at .17 seconds with an eval of +4.64 I ran this and at depth=11 Bd4 fails high against a window of +3.24 when searching only Bd4 at the root. This probably should be thrown out as both are probably going to end up pretty close in eval... > > >No. 148 (Rfc8): > >I think it's correct, but I need a stronger machine for this than this >notebook. At long analysis I find only Nxf4 for a draw score, but a long >analysis of Rfc8 starts showing plus scores. > >Recommend: Needs more analysis. > I get rfc8 at 2:39 on my notebook. eval=+1 > >Amir
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