Author: Robert Hyatt
Date: 05:54:25 05/25/98
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On May 25, 1998 at 05:56:08, Moritz Berger wrote: >Here's an interesting 'positional' test position: > >1k1r4/pp1bb1p1/1qn1p3/3pPr1p/1P6/P4NPP/4BPK1/R1BQ3R w - - 0 19 > >The (positional) key move is 19.Bb2!! which leads to a clear advantage >for white (e.g. 19.Bb2 Rc8 20.Nd4 Nxd4 21.Bxd4). 19.b5 only ensures >equality, 19.Bf4 (actually played by one program) lets black play >another beautiful key move: 19...h4! > >1k1r4/pp1bb1p1/1qn1p3/3pPr1p/1P3B2/P4NPP/4BPK1/R2Q3R b - - 0 19 > > >How long do your programs need to play 19.Bb2 and 19...h4 (after >19.Bf4)? 19...h4 is of course much easier than 19.Bb2. > > >Please try to let them run a little bit longer on the 19.Bb2 move since >e.g. Fritz also first choses it after 19" but discards it after 47" in >favour of another move. > >Here are results for Fritz from my P233MMX: > > >19.Bb2 >Fritz 5.01 (98304KB HT): 441" (12 ply) > >19...h4 >Fritz 5.01 (98304KB HT): 2" > > >Moritz h4 is probably trivial for any program with a little king safety, although I don't see a crushing advantage. Bf4 does seem suspect. But in the original position, I don't see a "big advantage" for white after Bb2. White's king is exposed (still), black's is tucked away from all the open lines that are threatened on the kingside. In short, I suspect that there are many other moves that white can try here, since he is going to be defending for a while anyway. Crafty finds h4 instantly and keeps it after about 5 seconds. Before that, it can't decide between h4 and g5, which also seems natural here. This is not "my type" of positional test, because there are multiple defensive moves that might be played... unless an IM/GM would say "Bb2 is the only reasonable move to play here." In that case, it's a hard one...
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