Author: jeff
Date: 19:19:24 10/29/97
Go up one level in this thread
On October 29, 1997 at 20:31:20, Robert Hyatt wrote: >On October 29, 1997 at 19:04:28, jeff wrote: > >>On October 29, 1997 at 08:56:57, Robert Hyatt wrote: >> >>>On October 28, 1997 at 19:42:37, Willie Wood wrote: >>> >>>>Bob, >>>> >>>>Congrats on your standing after round 5. >>>> >>>>Did you happen to look at 35 Bd8 in round 2? A couple programs I have >>>>show Be3 as the move. Was there some time pressure? >>>> >>>>WW >>> >>>Had a chance to study this this morning. Be3 leads to a worse position, >>>Crafty thinks. here is the PV: >>> >>> 11-> 1:18 -0.175 Be3 Ke6 Rxc7 Nxb7 Rc6+ Kf7 Kf1 Rh1+ >>> Ke2 Rxd1 Kxd1 Nxa5 Rc7+ Ke6 b4 >>> >>>while Bd8 looks better (to crafty): >>> >>> 11-> 1:20 0.087 Bd8 Nb5 Bh4 Nd4 Rc5 Nxb7 Rxe5 Kd6 Rb5 >>> Kc6 Rb6+ Kc7 Rxd4 Nxa5 >>> >>>shallower depths like Be3. I suspect crafty searched to depth=13 in >>>this position on the alpha... >> >> >>Does anyone think that crafty's 33. Bg5 was strange? BxPb2 looks much >>better. Maybe something is broken, Hyatt? Maybe it's me. > > >"broken" is probably the wrong term, as Bxb7 gets worse and worse as the >search goes deeper: > 7 1.20 1.304 Bxb7 e4 Rxd6+ Kxd6 Bf4+ Ke7 Bg5+ >Kd6 > Rc6+ Ke5 Bxa6 > 7-> 1.28 1.304 Bxb7 e4 Rxd6+ Kxd6 Bf4+ Ke7 Bg5+ >Kd6 > Rc6+ Ke5 Bxa6 > 8 1.85 -- Bxb7 > 8 2.63 0.923 Bxb7 e4 Rxd6+ Kxd6 Kf1 Rh1+ Ke2 >Rxc1 > Rxc1 Nc7 > 8-> 2.71 0.923 Bxb7 e4 Rxd6+ Kxd6 Kf1 Rh1+ Ke2 >Rxc1 > Rxc1 Nc7 > 9 4.50 0.842 Bxb7 e4 Rxd6+ Kxd6 Kf1 Rh1+ Ke2 >Rxc1 > Rxc1 Nc5 Bc8 > 9-> 4.58 0.842 Bxb7 e4 Rxd6+ Kxd6 Kf1 Rh1+ Ke2 >Rxc1 > Rxc1 Nc5 Bc8 > 10 10.02 0.895 Bxb7 e4 Rxd6+ Kxd6 Kf1 Rh1+ Ke2 g5 > Bxa6 Ra7 Bc8 Rxa5 Bxg5 > 10-> 10.11 0.895 Bxb7 e4 Rxd6+ Kxd6 Kf1 Rh1+ Ke2 g5 > Bxa6 Ra7 Bc8 Rxa5 Bxg5 > 11 17.56 -- Bxb7 > 11 28.79 0.225 Bxb7 e4 Rxd6+ Kxd6 Kf1 g5 Bxa6 Ra7 > Bc8 Rxa5 Bxg5 Rd5 > 11-> 28.83 0.225 Bxb7 e4 Rxd6+ Kxd6 Kf1 g5 Bxa6 Ra7 > Bc8 Rxa5 Bxg5 Rd5 > >while Bg5 doesn't do this: > > 7-> 0.58 0.855 Bg5 R2h5 Bxb7 Rxg5 Bxa6 e4 b4 > 8 1.23 0.847 Bg5 R2h5 Bxb7 Rxg5 Bxa6 Rh6 Bb5+ >Ke6 > Rc6 > 8-> 1.31 0.847 Bg5 R2h5 Bxb7 Rxg5 Bxa6 Rh6 Bb5+ >Ke6 > Rc6 > 9 3.67 0.940 Bg5 R2h5 Bxb7 Ke6 Bh4 g5 Rc6 Rxb7 >Rdxd6+ > Kf7 Rxa6 gxh4 > 9-> 3.75 0.940 Bg5 R2h5 Bxb7 Ke6 Bh4 g5 Rc6 Rxb7 >Rdxd6+ > Kf7 Rxa6 gxh4 > 10 8.67 1.010 Bg5 R2h5 Bxb7 Rxg5 Bxa6 Rgh5 Bb7 >Rh2 > Bc8+ Ke7 Rc7+ Kd8 > 10-> 8.75 1.010 Bg5 R2h5 Bxb7 Rxg5 Bxa6 Rgh5 Bb7 >Rh2 > Bc8+ Ke7 Rc7+ Kd8 > 11 22.35 1.072 Bg5 R2h5 Bxb7 Rxg5 Rc6 Rh6 Rxa6 e4 > Bd5 Ke7 b4 > 11-> 22.47 1.072 Bg5 R2h5 Bxb7 Rxg5 Rc6 Rh6 Rxa6 e4 > Bd5 Ke7 b4 > >Now as to "is this a horizon effect problem?" That I don't know yet. >But >I can see why Bg5 was played here based on comparing the two scores... I'm sorry...I didn't backup my post. Crafty 12.6 chooses Bxb7 through 14 ply with around a +1.3 score. I was wondering what was going on here? I ran wcrafty on a PPRO 200 under win95 using the default settings for 30 minutes. I chose 12.6 due to its "solid" reputation.
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