Author: Ernst Walet
Date: 06:29:47 11/23/02
Go up one level in this thread
On November 22, 2002 at 23:33:18, Matthew Barnett wrote: >[D]8/8/pp1p1n2/2pPnkp1/P1P5/2B1K2P/4B3/8 w - - 0 49 > > >Black is already struggling and, according to Nunn's own extensive analysis, any >move by the e2 bishop is a 'tactical error' that will end White's campaign >because of ...Nxc4 or ...g4 or 49 Bd3+ Nxd3 50 Kxd3 Ne4 51 Be1 Kf4. Nunn >suggests White's best defensive ploy is 49 Bb2 to keep the black-square bishop >on the long diagonal to cover e5. Counter-attacking with a5 weakens White's >position and hastens his demise. > >Nunn doesn't analyse Bd2 which looks worthy of some investigation. > >What does your (favourite) engine say for White's 49th move? > > >ChessMaster 9000 (default Chessmaster personality with 128MB cache; AMD 1900+) >gives... > >Time Depth Score Positions Moves >0:07 6/12 -0.94 2096565 1.a5 bxa5 2.Bxa5 g4 3.hxg4+ Nfxg4+ > 4.Kd2 Ke4 5.Kc2 Kd4 6.Bc3+ Ke3 > 7.Bd1 Ke4 8.Be2 Ne3+ 9.Kb3 >0:21 7/13 -0.99 5983653 1.a5 bxa5 2.Bxa5 g4 3.hxg4+ Nfxg4+ > 4.Kd2 Ke4 5.Kc3 Ke3 6.Bf1 Nf6 7.Bg2 > Ne4+ 8.Bxe4 Kxe4 9.Bc7 Nf7 >0:33 7/13 -0.94 9192821 1.Ba1 b5 2.cxb5 Nxd5+ 3.Kd2 axb5 > 4.Bxb5 Ke4 5.a5 Nf3+ 6.Kc1 Nc7 > 7.Bf1 Nd4 8.Bg2+ Ke5 9.Bb2 >1:05 8/14 -0.95 18242820 1.Ba1 Ng8 2.Bc3 Nh6 3.Bb2 Nhf7 > 4.Ba1 g4 5.hxg4+ Nxg4+ 6.Kd2 Nfe5 > 7.Bc3 Nf6 8.Ke3 Ne4 >2:51 9/15 -1.05 47165997 1.Ba1 b5 2.cxb5 axb5 3.Bxb5 Nxd5+ > 4.Kd2 Nc7 5.Bf1 d5 6.Kc1 Ke6 7.Bb2 > Nc6 8.Kd2 Nb4 9.a5 >4:00 9/15 -0.93 67409472 1.Bb2 a5 2.Bc3 Nfd7 3.Be1 g4 4.hxg4+ > Nxg4+ 5.Kd3 Nde5+ 6.Kc2 Ne3+ 7.Kc3 > Ke4 8.Bd2 Nf5 9.Bf1 Nd4 10.Bg2+ > Nef3 11.Bg5 >6:44 10/16 -0.86 115465236 1.Bb2 Nfd7 2.Bc3 g4 3.hxg4+ Nxg4+ > 4.Bxg4+ Kxg4 5.Ke4 Nf8 6.Bf6 Ng6 > 7.Bg7 Nh4 8.Bh6 Nf5 9.Bf4 a5 10.Bh2 > Ng3+ 11.Kd3 >13:14 11/17 -0.87 228273078 1.Bb2 Nfd7 2.Bc3 g4 3.hxg4+ Nxg4+ > 4.Bxg4+ Kxg4 5.Ke4 Nf8 6.Bf6 Ng6 > 7.Bg7 Nh4 8.Bf6 Nf3 9.Be7 Ng5+ > 10.Ke3 Nf7 11.Ke4 Ne5 >(Stopped analysis after 20 minutes) > > >Bests > >Matthew I took it some plies more, with SS=12. With this setting, it chooses Bb2 in 8 seconds at 13 ply. Ernst. Time Depth Score Positions Moves 0:00 1/7 -0.85 31653 49.a5 bxa5 50.Bxa5 g4 51.hxg4+ Nfxg4+ 52.Kd2 Ke4 53.Bc3 Nf3+ 54.Kc2 Ne3+ 55.Kb3 0:00 1/8 -0.87 54684 49.a5 bxa5 50.Bxa5 g4 51.hxg4+ Nfxg4+ 52.Kd2 Ke4 53.Bc3 Nf3+ 54.Kc1 Nge5 0:00 1/9 -0.81 95531 49.a5 bxa5 50.Bxa5 g4 51.hxg4+ Nfxg4+ 52.Kd2 Kf4 53.Bc7 Nf2 54.Kc2 Ne4 0:01 1/10 -0.86 167878 49.a5 bxa5 50.Bxa5 g4 51.hxg4+ Nfxg4+ 52.Kd2 Nf2 53.Ke3 Neg4+ 54.Kd2 Ne4+ 55.Kd3 Kf4 56.Bc7 Ne5+ 57.Kc2 0:02 2/11 -0.92 329277 49.a5 bxa5 50.Bxa5 g4 51.hxg4+ Nfxg4+ 52.Kd2 Ke4 53.Kc2 Ke3 54.Bxg4 Nxg4 55.Bc7 Kd4 56.Bxd6 Ne3+ 57.Kb3 Nxc4 0:07 3/12 -0.94 1125916 49.a5 bxa5 50.Bxa5 g4 51.hxg4+ Nfxg4+ 52.Kd2 Ke4 53.Kc2 Kd4 54.Bc3+ Ke3 55.Bd1 Ke4 56.Kb3 Ne3 57.Be2 0:08 3/12 -0.90 1397829 49.Bb2 b5 50.cxb5 Nxd5+ 51.Kd2 axb5 52.Bxb5 Nf4 53.Bf1 Nf3+ 54.Ke3 Ng1 55.a5 Ngxh3 56.a6 0:16 4/13 -0.90 2692701 49.Bb2 Nfd7 50.Bc3 a5 51.Be1 g4 52.hxg4+ Nxg4+ 53.Kd2 Ndf6 54.Kd3 Ne5+ 55.Kd2 Kf4 56.Kc2 Ne4 57.Bh4 0:38 5/14 -0.90 6731418 49.Bb2 Ng8 50.Bc3 Nh6 51.a5 bxa5 52.Bxa5 g4 53.hxg4+ Nhxg4+ 54.Kd2 Ke4 55.Kc2 Nf3 56.Kc3 Ke3 57.Bd3 Nf2 1:42 6/15 -0.92 18212904 49.Bb2 Ng8 50.Bc3 Nh6 51.a5 bxa5 52.Bxa5 g4 53.hxg4+ Nhxg4+ 54.Kd2 Ke4 55.Kc2 Ke3 56.Bxg4 Nxg4 57.Bc7 Kd4 58.Bxd6 Ne3+ 59.Kb3 Nxc4 4:34 7/16 -0.93 50614056 49.Bb2 Nfd7 50.Bc3 a5 51.Be1 g4 52.hxg4+ Nxg4+ 53.Kd3 Nde5+ 54.Kc2 Ne3+ 55.Kc3 Kf4 56.Bd2 Ke4 57.Bc1 Nf5 58.Bg5 Nd4 8:23 8/17 -0.87 93925811 49.Bb2 Nfd7 50.Bc3 a5 51.Be1 g4 52.hxg4+ Nxg4+ 53.Kd3 Nde5+ 54.Kc2 Ne3+ 55.Kc3 Ng2 56.Bd2 Ke4 57.Bg5 Nf4 58.Bf1 Nf3 59.Be7 24:35 9/18 -0.81 273690063 49.Bb2 b5 50.cxb5 Nxd5+ 51.Kd2 axb5 52.Bxb5 Nc7 53.Be2 d5 54.a5 c4 55.Ke3 Ke6 56.Kd4 Nd7 57.Ke3 Nc5 58.Bd1 Ne4 55:29 10/19 -0.84 617163354 49.Bb2 b5 50.cxb5 Nxd5+ 51.Kd2 axb5 52.Bxb5 Nc7 53.Be2 Nc6 54.Bg4+ Ke4 55.Bf6 Kf4 56.Bd7 Ne5 57.Be7 Ke4 58.Bg4 Nc4+ 59.Kc1 Kf4 60.a5 2:27:48 11/20 -0.82 1633989265 49.Bb2 b5 50.cxb5 Nxd5+ 51.Kd2 axb5 52.Bxb5 Nc7 53.Be2 d5 54.a5 c4 55.Bd4 Ke4 56.Bb6 Na6 57.Be3 d4 58.Bxg5 c3+ 59.Kc1 Nd3+ 60.Bxd3+ Kxd3
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