Author: John Merlino
Date: 12:52:05 01/28/03
Go up one level in this thread
On January 27, 2003 at 08:00:07, Mike Hood wrote: >Like many other spectators I was surprised by Deep Junior's 17th move. > >[D] r4rk1/pb1n1ppp/2qN4/4p1Pn/2p1P3/2Q1BN2/PP3P1P/2KR3R b - - 0 17 > >The quality sacrifice seems to achieve nothing. Chessbase's commentary on the >move is "Gives a rook for a knight in order to save the pawn on e5" and gives a >brief alternative line. I'm sure there is more to it than this. Could someone >please post an analysis of what would have happened if DJ had played other >moves, in particular Rab8? I don't see how Rab8 could have lead to anything >worse than what actually happened. Chessmaster 9000, on a humble P3-733, never considers Rae8, and instead would choose either Rad8 or Qc7, depending on hardware and time control: Time Depth Score Positions Moves 0:00 1/4 1.64 14241 17...f6 18.Nxb7 Qxb7 19.Qxc4+ Kh8 20.Kb1 Rac8 0:01 1/5 1.76 42308 17...f6 18.Rhg1 Nf4 19.Bxf4 exf4 20.Nxb7 Qxb7 21.Qxc4+ Rf7 0:01 1/5 1.66 50139 17...Qc7 18.Nxe5 Bxe4 19.Nxd7 Bxh1 20.Nxf8 Rxf8 21.Qxc4 0:01 1/6 1.66 94420 17...Qc7 18.Nxe5 Bxe4 19.Nxd7 Bxh1 20.Nxf8 Rxf8 21.Qxc4 0:04 1/7 1.66 248778 17...Qc7 18.Nxe5 Bxe4 19.Nxd7 Bxh1 20.Nxf8 Rxf8 21.Qxc4 0:08 1/8 1.66 545084 17...Qc7 18.Nxe5 Bxe4 19.Nxd7 Bxh1 20.Nxf8 Rxf8 21.Qxc4 0:16 1/8 1.59 1053331 17...f6 18.gxf6 Nhxf6 19.Nxe5 Nxe5 20.Qxe5 c3 21.f3 cxb2+ 22.Kxb2 Ba6 23.Qc5 0:19 1/8 1.56 1284134 17...Rad8 18.Nxe5 Nxe5 19.Qxe5 Ba8 20.Rhe1 Qa4 21.a3 Bc6 22.f4 0:31 1/9 1.72 2150256 17...Rad8 18.Nxe5 Nxe5 19.Qxe5 Ba8 20.Rhe1 Qa4 21.a3 Rd7 22.f4 Qb3 1:12 1/10 1.68 5158064 17...Rad8 18.Nxe5 Nxe5 19.Qxe5 Ba8 20.Rhe1 Qa4 21.a3 Rd7 22.Qc5 Re7 23.f3 2:18 1/10 1.55 9774601 17...Qc7 18.Rd2 f6 19.Nxb7 Qxb7 20.Rhd1 Rf7 21.gxf6 Nhxf6 22.Ng5 Re7 23.Qxc4+ Kh8 4:43 2/11 1.58 20781560 17...Qc7 18.Nxe5 Bxe4 19.Nxd7 Bxh1 20.Nxf8 Bf3 21.Rd2 Rxf8 22.Bxa7 Bc6 23.Qe3 The eval for Rae8 is about 0.5 worse for Black. jm
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