Author: Joachim Rang
Date: 04:49:33 11/14/02
Go up one level in this thread
On November 13, 2002 at 17:00:20, Robert Hyatt wrote: >On November 13, 2002 at 10:24:44, Uri Blass wrote: > >>On November 13, 2002 at 09:43:36, Bob Durrett wrote: >> >>>On November 13, 2002 at 06:48:47, Joachim Rang wrote: >>> >>>>yep, I think you're right. >>>> >>>>This is what I got from DF 7 on depth 15: >>>> >>>>New game >>>>5rk1/p1p1br2/1p1p2qp/4p3/2PPn1pP/3Q2P1/PPN1P1K1/2RR2B1 b - - 0 1 >>>> >>>>Analysis by Deep Fritz 7: >>>> >>>>1. -+ (-3.31): 1...Bxh4 2.gxh4 Rf3 3.dxe5 Rxd3 4.exd3 dxe5 5.Be3 Nd6 6.h5 Qxh5 >>>>7.Rh1 Qf5 8.Ne1 >>>>2. -+ (-3.09): 1...Rf3 2.exf3 gxf3+ 3.Qxf3 Rxf3 4.Kxf3 Nxg3 5.dxe5 Bxh4 6.Rd4 >>>>Qf5+ 7.Kg2 Ne2 8.Ne3 Qxe5 9.Rg4+ Bg5 10.Re1 >>> >>>Obviously, then, 1...Bxh4 is better than 1...Rf3. Right? : ) >>> >>>Bob D. >> >>No >> >>I suspect that the order may be changed if you use longer search. >> >>The line 1...Rf3 2.exf3 gxf3+ 3.Qxf3 Rxf3 4.Kxf3 Nxg3 is forced and >>after it 5.dxe5 is not the best move. >>I expect programs that use singular extensions like Deep Sjeng to find 1...Rf3 >>after a long search. >> >>Uri > > >I think he meant "obviously, since the score is worse for black after Rf3 >than it is for Bxh4, then the program thinks it is better." I don't understand >unless that is "multi-variation output" why the second move was even displayed >since the score is less negative (better for white). yes of course, mv=2. Although on depth 15 DF7 considers Bxh4 slightly better than Rf3, this output shows that both moves have a winning score and only a slight different. Try this with other engines and you will see, that the score will only slightly differ and that both moves are evaluated as winning for black.
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