Author: Uri Blass
Date: 11:20:45 06/28/02
Go up one level in this thread
On June 28, 2002 at 13:33:42, Vincent Diepeveen wrote: >On June 27, 2002 at 11:53:00, Roy Eassa wrote: > >>On June 27, 2002 at 04:04:07, Vincent Diepeveen wrote: >> >>>Hello, >>> >>>Several positions in WM test the solutions given aren't the >>>objective best moves. >>> >>>For example i get impression that at position 16: >>> >>> >>>r1k4r/1b1q1pp1/p6p/3n4/1B3Pn1/1P1B4/P1PQ3P/2KRR3 w - - bm Ba5; id "CSS WM-Test >>>16) Lb4-a5 (K)"; >>> >>>Undoubtfully Ba5 is a good move, but completely material >>>winning is c2-c4 here. You get directly a rook at the 7th rank, >>>swallow f7 + g7, and black is completely immobilized the rest of >>>the game. Soon also Rd1-e1-e7 happens and it's a mate in XXX soon >>>then. >>> >>>I can imagine why a human plays Ba5 here and doesn't take a risk (note >>>the chessprograms want this all initially too), but let's look objective >>>to the position. Not finding c4 soon means a program is a tactical joke. >>> >>>As a human i wouldn't find c4 so soon either. I would go for Ba5, because >>>i know how much i suck in tactics. >>> >>>Best regards, >>>Vincent >> >> >>[d] r1k4r/1b1q1pp1/p6p/3n4/1B3Pn1/1P1B4/P1PQ3P/2KRR3 w - - >>I think the point of 1.Ba5 is to play c4 NEXT, when it is even more effective. >> >>Here are some possibilities: >> >>1.Ba5! >> >> [1.c4 Nxb4 2.Qxb4 Nf6 >> (2...Kb8 3.Re7 a5 4.Qe1 Qc8 5.h3 Nf6 6.Qe5+ Ka7 7.Qd4+ Kb8 8.Qd6+ Ka7 >> 9.c5 Rd8 10.Qb6+ Kb8 11.Rxb7+ Qxb7 12.Qxd8+ +-) >> 3.Re7 Qc6 4.Rxf7 >> (4.Bf5+ Kb8 5.Rd6 a5 6.Qb6 Qxb6 7.Rxb6 Ra7 8.Rxf7 +=) >> 4...a5 >> (4...Kb8 5.Rxg7 Rd8 6.Bf1 Rxd1+ 7.Kxd1 Qf3+ 8.Be2 Qh1+ 9.Kc2 +-) >> 5.Qc3 Re8 >> (5...Qe6 6.Rxg7 Re8 7.Bg6 Rf8 8.Qd4 Kb8 9.Bf5! Qxf5 10.Qd6+ Ka7 >> 11.Rxb7+ Kxb7 12.Qe7+ +-) >> 6.Bg6 Qc5 >> (6...Kb8 7.Rxg7 Re2 8.Rd8+ Bc8 9.Bf5 +-) >> 7.Rxf6 >> (7.Qd3 Rg8 8.Bh7 Rh8 9.Rxg7 Kb8 10.Bg6 Ra6 =) >> 7...Re2 8.b4 axb4 9.Qd3 Kb8 10.Qxe2 gxf6 +=] >> >>1...Kb8 >> >> [1...Bc6 2.c4 Ndf6 3.h3 Bf3 4.Bf5 Qxf5 5.Re7 +-] >> >> [1...h5 2.c4 Nc7 3.Qb4 Ne6 4.Bf5 Qc6 5.Rd6 +-] >> >>2.c4! Nde3 3.Rxe3 Nxe3 4.Qxe3 Re8 5.Be4 Qc8 6.Qb6 Ra7 7.Bb4 Ka8 8.Bc5 Qb8 9.Rd7 >>+- > >my lines with c4 are a bit longer than just 17 ply with singular extensions >turned on. I did not analyze that position but Roy gives a line with 20 ply for 1.c4 in his analysis and not 17 plies. The 17 plies are for 1.Ba5 and only later 2.c4 The main line after 1.c4 is 1...Nxb4 2.Qxb4 Nf6 3.Re7 Qc6 4.Rxf7 a5 5.Qc3 Re8 6.Bg6 Qc5 7.Rxf6 Re2 8.b4 axb4 9.Qd3 Kb8 10.Qxe2 gxf6 += and it is considered as inferior relative to 1.Ba5 I express no opinion about that line because I did not analyze the position. Uri
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