Author: Uri Blass
Date: 04:36:24 09/15/05
Go up one level in this thread
On September 15, 2005 at 07:21:19, Ed Schröder wrote: >On September 15, 2005 at 06:43:22, Gian-Carlo Pascutto wrote: > >>On September 15, 2005 at 06:26:30, Ed Schröder wrote: >> >>>On September 15, 2005 at 04:30:38, Mark Young wrote: >>> >>>>On September 14, 2005 at 17:05:59, Ernst Walet wrote: >>>> >>>>>Because Zappa 1.1 is SMP and 64 bit, I gave it a try and was pleasant suprised. >>>>>One of my favourite chess positions is this one, where Kasparov played Rxd4. >>>>>How do other engines do? If your engine finds it please give it a couple of more >>>>>plies to see if it holds it. >>>> >>>>The better test for the engine in this position, is to see when the program see >>>>that Rxd4 is not winning. Since Rxd4 is only a draw with best play. >>>>This is why many programs will not play Rxd4, or drop the move with a longer >>>>search. >>> >>>1. Rxd4 cxd4 2. Re7+ Kb6 3. Qxd4+ Kxa5 4. b4+ Ka4 5. Ra7 Bb7 6. Rxb7 Qxd5 7. Rb6 >>>1-0 >> >>I always thought that simply 1. .. Kb6 was never refuted? > >You are absolutely right, missed that one. But I would like to see the engine >that plays 1..Kb6 > >Hmmm... > >Ed I believe that 1...Kb6 was discovered by some engine. I am not sure if it is the only move for black and a lot of engines are not going to play cxd4. Note that I could prove that 1...cxd4 is bad by retrogradic analysis with yace Some possible lines that you can use to do it: [Event "?"] [Site "?"] [Date "????.??.??"] [Round "?"] [White "New game"] [Black "?"] [Result "*"] [SetUp "1"] [FEN "b2r3r/k4p1p/p2q1np1/NppP4/3p1Q2/P4PPB/1PP4P/1K1RR3 w - - 0 1"] [PlyCount "2"] 1. Rxd4 Kb6 (1... cxd4 2. Re7+ Kb6 3. Qxd4+ Kxa5 (3... Qc5 4. Qxf6+ Qd6 5. Be6 Bxd5 6. b4) 4. b4+ Ka4 5. Ra7 Bb7 (5... Bxd5 6. Qc3) (5... Nxd5 6. Rxa6+) 6. Rxb7 Qxd5 7. Rb6 a5 8. Ra6 Ra8 9. Qe3) *
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