Author: Bryan Hofmann
Date: 08:18:19 05/09/04
Go up one level in this thread
On May 08, 2004 at 15:57:21, Uri Blass wrote: >On May 08, 2004 at 15:54:04, Bryan Hofmann wrote: > >>On May 08, 2004 at 15:27:01, Uri Blass wrote: >> >> >>>Or maybe the position is not correct. >>> >>>Movei cannot find a5 even after an hour of search but is happy with Qe8 when it >>>can see positive score at depth 14 after a long search. >>> >> >>That is the main reason I posted it, I wanted to see what other engines would do >>as I'm not sure a5 is the best move here either. I do know that the engines I >>have tested this move with when the a5 move is made against them their score >>goes more negative then the b5 or Qe8 move. > >Not movei >Qe8 was leading to slightly positive score for black at depth 14 when >after a5 there is still +0.54 for white at depth 12. > >11 81 28879 53737414 d1e3 a5a4 b3a4 a8a4 d7c7 c8e8 c7b7 a4a2 d5d3 g7d4 e3c2 >11 81 43816 81620863 d1e3 a5a4 b3a4 a8a4 d7c7 c8e8 c7b7 a4a2 d5d3 g7d4 e3c2 >12 53 55493 103187757 d1e3 a5a4 b3a4 a8a4 d7c7 c8f8 c7b7 f8a3 c1d1 c6d4 d5d8 g8 >h7 b7b3 d4b3 d8d3 h7g8 a2b3 >12 54 62971 117288604 c1b1 >12 54 65816 122545111 c1b1 a5a4 b3b4 b7b5 d7c7 c8f8 d5b5 a8b8 c7b7 b8b7 b5b7 f8 >b4 b7b4 c6b4 I did some testing with several engines (Tao, Aristarch, Ruffian, ElChinito, List) and cam up with the following. It would appear the a5 is the Best move. Movei Line 12 54 65816 122545111 c1b1 a5a4 b3b4 b7b5 d7c7 c8f8 d5b5 a8b8 c7b7 b8b7 b5b7 f8 b4 b7b4 c6b4 Stepping thru this PV places white in a bad position rather quickly. After b4 move for white the move that would be choosen for black is Nxb4 looking something like this; 12 01:29 4.20 Nxb4 Qxb7 Qxc4 Qxa8+ Kh7 Rd2 Nxa2 Nb2 Nc3+ Kc2 Qb3+ Kc1 Qa2 Kc2 Rb6 Kd3 Rxb2 Rxb2 Qxb2 This is ChessMaster's Line for Qe8 move ...Qe8 23.f3 Re2 24.Re1 Rxe1 25.Bxe1 Ne5 26.Rd6 Bf8 27.Bc3 Bxd6 28.Qxd6 Ng6 29.Qd4 Following CM's line leads to somewhat of a even position but negative for black with; 13 02:48 -0.31 f6 Qxf6 Qf7 Qd4 Qf4+ Kc2 Qxd4 Bxd4 Nf4 Ne3 a6 a4 Rd8 Bf6 Rd6 After the a5 move if a4 (Which appears to be the BM) is played it looks something like this; Nd4 Rxb7 Qf8 c5 Rc8 Rc7 Rb8 Bd6 Qd8 Rb7 Rxb7 Qxb7 Qf6 Qa8+ Kh7 Qd5 Re2 Qc4 Kg8 Qxe2 Nxe2+ Kd2 Nc3 Re1 Qd4+ then a few PVs from here look like; 15 00:45 -11.76 Kc2 Nxd1 Bg3 Nb2 Re8+ Kh7 Be5 Bxe5 Rxe5 Qxe5 f3 Qe2+ Kc3 Nd1+ Kd4 Qe3+ Kc4 Nb2+ Kb5 Qxb3+ Kc6 Qd3 f4 Nxa4 Following the b5 line does lead to a good position for Black but it takes several moves to chase down the king. Something like the following; b5 Rd6 Nb4 Qxb5 Nxa2+ Kd2 Bf8 Rd7 a6 Qd5 Qe8 Ne3 Nb4 Qb7 Rd8 Rd5 Rxe3 fxe3 Nxd5 cxd5 Qe4 Rg1 Bb4+ Ke2 Re8 Qb6 Qc2+ and a PV lokking like; 14 03:17 -8.37 Kf3 Bc5 Qxc5 Qxc5 Re1 Qxd5+ Kf2 Qxb3 e4 f5 exf5 Qc2+ Kf1 Qxf5+ Kg1 Qc5+ Kh1 Rxe1+ Bxe1 Kf7
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