Author: Richard A. Fowell (fowell@netcom.com)
Date: 01:11:09 03/02/99
Go up one level in this thread
On March 01, 1999 at 04:48:28, Will Singleton wrote: >u2600 Position of the Week >-------------------------- > >5R2/8/8/4rp2/3r4/5k2/2B1p2P/2K1R3 w - - >ArasanX Amateur, 0-1, 1999.02.27, fics > >In this position, White played 78. Rg8 and lost. Could your >program avoid that move within 10 seconds or so? The game might be >lost in any event (not sure); there is still some play left. > >Note the wide difference between Amateur and MacChess in their analyses. >MacChess takes only 3 seconds to discard Rg8, running at over 300k nps. >Amateur, otoh, takes 43 seconds to realize what's happening (both at ply 9). >(The follow-on position is also worth a look. Does your prog play 78... Kf2 >quickly?) > >Amateur 0.92, Macintosh g3/300 -- >ply score time nodes n/s pv > > 2 320 0.01 898 53880 > 3 -64 0.04 1253 18780 Bxf5 Kf2 Rh1 Qe1 Rxe1 Kxe1 > 3 98 0.05 2138 25620 Kb2 Rb4 Bb3 Kf2 > 3 99 0.05 2402 28800 Kb1 Kf2 Rf1 > 3 100 0.05 2561 30720 h3 Kf2 Rf1 > 3 101 0.06 3072 30720 Rxf5 Rxf5 > 4 -88 0.08 4479 33540 Rxf5 Rxf5 Bxf5 Kf2 Rh1 Qe1 Rxe1 Kxe1 > 4 -85 0.10 7788 46680 Bxf5 Rf4 Rxe2 Rxe2 > 4 99 0.18 16876 56220 Kb2 Kf2 Kc3 Rh4 > 5 94 0.25 26428 63420 Kb2 Kf2 Kc3 Rh4 Kd2 > 5 100 0.30 35312 70620 Rg8 Ra5 Rg7 Ra1 Bb1 Rxb1 > 6 93 1.00 82818 82800 Rg8 Kf2 Rg1 Rh4 Rh1 Rxh2 > 7 84 2.46 254747 92040 Rg8 Rh4 Rg1 Rc5 > 8 3 9.42 934686 96300 Rg8 Rh4 Rg1 Rxh2 Rg5 > 9 -210 43.51 4119536 93900 Rg8 Kf2 Rg1 Rc5 h4 Rc4 Rxe2 Kxg1 h5 f4 > 9 -90 173.30 15411507 88800 Kb2 Kf2 Rxf5 Rxf5 Rxe2 Kxe2 Bxf5 Ke3 >Kc3 Rh4 h3 Rh6 > 9 -88 193.53 17222900 88800 Rxf5 Rxf5 Bxf5 Kf2 Rh1 Kg2 Re1 Kf2 Rh1 >Qe1 Rxe1 Kxe1 > >MacChess 4.0, Macintosh g3/300 -- >02/01|00:00:00| 192| +269| Bxf5 Kf4 >03/01|00:00:00| 3294| -79| Bxf5 Kf2 Rxe2+ Rxe2 >03/04|00:00:00| 4693| -73| h3 Kf2 Rxe2+ Rxe2 Bxf5 >03/11|00:00:00| 6764| +95| Kb2 Rb4+ Kc3 Rbb5 >04/01|00:00:00| 10761| +96| Kb2 Kf2 Kc3 Rdd5 >05/01|00:00:00| 19781| -80| Kb2 Kf2 Rxf5+ Rxf5 Rxe2+ Kxe2 Bxf5 >05/02|00:00:00| 21758| -76| Rxf5+ Rxf5 Bxf5 Kf2 Rxe2+ Kxe2 h3 Kf3 >05/04|00:00:00| 25407| -74| h3 Kf2 Rxe2+ Rxe2 Bxf5 Kg3 >05/11|00:00:00| 32001| -72| Bxf5 Kf2 Rxe2+ Kxe2 h3 Kf3 >05/20|00:00:00| 66502| +87| Rg8 Rc4 Kd2 Rd4+ Kc3 Rdd5 >06/01|00:00:00| 86325| -66| Rg8 Kf2 Rgg1 f4 h3 f3 Rh1 >07/01|00:00:00| 239157| -32| Rg8 Rh4 h3 Kf2 Rgg1 Rxh3 Bb1 >08/01|00:00:02| 667258| -66| Rg8 Kf2 Rgg1 f4 h3 f3 Rh1 Rc4 Kd2 >09/01|00:00:03| 1073439| -188| Rg8 Kf2 Rgg1 Rc5 h4 Rdc4 Kb1 Rxc2 h5 >09/02|00:00:03| 1329074| -84| Rxf5+ Rxf5 Bxf5 Kf2 Rxe2+ Kxe2 h3 Rd1+ Kc2 Rd2+ >Kc1 Ke3 Be4 Rh2 >10/01|00:00:08| 2854279| -85| Rxf5+ Rxf5 Bxf5 Kf2 Rxe2+ Kxe2 h3 Rd1+ Kc2 Rd2+ >Kc1 Ke3 Be4 Rh2 Bf5 > <snip> MacChess 5.01 is actually a little slower to see this than MC4.0, although on your machine, I think it would just find Rxf5+ in 10 seconds MacChess 5.01 604e/180, 32Mb hash Tuesday, March 2, 1999 12:57 AM 5R2/8/8/4rp2/3r4/5k2/2B1p2P/2K1R3 w - - 02/01|00:00:00| 147| +269| Bxf5 Kf4 03/01|00:00:00| 1695| -79| Bxf5 Kf2 Rxe2+ Rxe2 03/04|00:00:00| 2588| -73| h3 Kf2 Rxe2+ Rxe2 Bxf5 03/11|00:00:01| 4601| +95| Kb2 Rb4+ Kc3 Rbb5 04/01|00:00:01| 8216| +96| Kb2 Kf2 Kc3 Rdd5 05/01|00:00:01| 15712| -80| Kb2 Kf2 Rxf5+ Rxf5 Rxe2+ Kxe2 Bxf5 05/02|00:00:01| 20340| -72| Bxf5 Kf2 Rxe2+ Kxe2 h3 Kf3 05/20|00:00:01| 55715| +88| Rg8 Rc4 Rg5 Kf2 Rgg1 06/01|00:00:01| 69184| -66| Rg8 Kf2 Rgg1 f4 h3 f3 Rh1 07/01|00:00:02| 206898| -32| Rg8 Rh4 h3 Kf2 Rgg1 Rxh3 Bb1 08/01|00:00:05| 643380| -66| Rg8 Kf2 Rgg1 f4 h3 f3 Rh1 Kg3 Reg1+ Kf4 09/01|00:00:09| 1361952| -188| Rg8 Kf2 Rgg1 Rc5 h4 Rdc4 Kb1 Rxc2 h5 09/02|00:00:17| 2740170| -83| Kb2 Kf2 Rxf5+ Rxf5 Rxe2+ Kxe2 Bxf5 Rf4 Bc2 Rf2 h4 Rh2 09/03|00:00:18| 2898405| -80| Bxf5 Kf2 Rxe2+ Kxe2 h3 Ke1 Bc2 Re2 Kb2 Rh2 09/04|00:00:19| 3027573| -71| Rxf5+ Rxf5 Bxf5 Kf2 Rxe2+ Kxe2 h4 Rf4 Bc2 Rf1+ Kb2 Rh1 h5 10/01|00:00:22| 3648134| -71| Rxf5+ Rxf5 Bxf5 Kf2 Rxe2+ Kxe2 h4 Ke3 h5 Rh4 Kb2 Rh2+ Kc3 Kf4 11/01|00:00:33| 5523090| -67| Rxf5+ Rxf5 Bxf5 Kf2 Rxe2+ Kxe2 h4 Rd1+ Kb2 Rd5 Bg4+ Ke3 h5 Rd2+ Kc3 Rd3+ Kc2 Ke4 12/01|00:00:56| 9707070| -66| Rxf5+ Rxf5 Bxf5 Kf2 Rxe2+ Kxe2 h4 Rd1+ Kc2 Rd2+ Kb3 Rd5 Be6 Re5 Bc4+ Kf3 h5 Rf5 13/01|00:01:51| 20088029| -65| Rxf5+ Rxf5 Bxf5 Kf2 Rxe2+ Kxe2 h4 Rd1+ Kb2 Rd5 Be6 Rb5+ Kc3 Kf3 h5 Re5 Bc4 Kf4 14/01|00:04:10| 45743747| -64| Rxf5+ Rxf5 Bxf5 Kf2 Rxe2+ Kxe2 h4 Rd1+ Kc2 Rd5 Bg6 Rc5+ Kb3 Kf3 h5 Rb5+ Kc4 Rg5 Bd3 Re5 Tuesday, March 2, 1999 1:06 AM
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