Author: Brian Richardson
Date: 12:37:22 10/25/99
Go up one level in this thread
On October 25, 1999 at 14:45:29, Scott Gasch wrote: >Hello. > >I recently ran the LCTII test positions against my engine. Suffice to say it >did badly. It solved almost all of the tactical positions rather quickly (where >a material advantage or a mate was possible). However it did not get many of >the others. This tells me that it is too materialistic (since it does not miss >any ways to grab pieces) but it has nowhere near enough positional knowledge. > >I'd like to use the information from the ones it missed in order to better tune >the eval. However, I do not know enough about chess to understand why one of >the solutions is the best in some cases. Has anyone written a kind of "here is >the reason the solution is the best move" document about this test suite or any >test suite? > >I'm currently re-running the test with a larger lazy-eval and delta pruning >window... If anyone is interested I will post the results here. > I found this diagrams.txt file in a suites.zip file somewhere when looking for test suites myself (and my LCTII results are pretty dismal so far(only 13 of 35 right at 600secs): ******************************************************************************* LCT II test (c) Frederic Louguet & La Puce Echiqueenne v1.21 - 04/02, 1996 ******************************************************************************* ------------------------------------------------------------------------------- 1 - Pos Tchernine - Miles: d6! (Tunis 1985) White has a space advantage and puts pressure on c5. ------------------------------------------------------------------------------- 2 - Pos Lilienthal - Botvinnik : ...Bb4! (Moscou 1945) The idea is that the knight will be very strong on e4 after the exchange on c3 to remove this annoying pin. ------------------------------------------------------------------------------- 3 - Pos Boissel - Boulard : Qc5! (By mail 1994) It would be bad to exchange queens. White can put the weak black squares around the bishop on e6 to good use (the h2 pawn is not important). ------------------------------------------------------------------------------- 4 - Pos Kaplan - Kopec : ...e5! (USA 1975) After 2.fxe5 Be6 black is all right in spite of the two pawns lost. ------------------------------------------------------------------------------- 5 - Pos Estrin - Pytel : ... Bb5! (Albena 1973) After 2.Bxb5 axb5 black dominates the C file with ...Rc4 followed by the other rook. ------------------------------------------------------------------------------- 6 - Pos Nimzovitch - Capablanca: ...e5! (New-York 1927) This positional sacrifice allows black to gain control of the second rank after 2.Bxe5 Rdd2. ------------------------------------------------------------------------------- 7 - Pos Tartacover - Rubinstein : Nd1! (Moscou 1925) This move prevents black from stopping the attack with ...Bd7 and ...Be8. On ...Bd7 white would play Ne3, and the answer to ...Be8 would be Nf5. ------------------------------------------------------------------------------- 8 - Pos Polougaievsky - Unzicker : Bh3! (Kislovodsk 1972) White loses the bishop pair but prevents the knight on f8 to go to d4 via e6. ------------------------------------------------------------------------------- 9 - Pos Boissel - Del Gobbo: Qd4! (By mail 1994) Increases the white advantage in the center by sacrifying the passed pawn on a4. (...Qxa4 2.Nd5 Ne6 3.Rb8 Be8 4.Rxe8 Qxe8 5.Qxc4). ------------------------------------------------------------------------------- 10 - Pos Cucka - Jansa : ...Bf8! (Brno 1960) With no queens left, this is a good thing to activate the bishop pair and to free the e7 square for the black King. ------------------------------------------------------------------------------- 11 - Pos Landau - Schmidt : h4! (Noordwijk 1938) The only move to try to win. 41.h4 gxh4 42.f4 opens the position for white. ------------------------------------------------------------------------------- 12 - Pos Kortchno‹ - Karpov : ...Rb6! (Merano 1981) To put some pressure on the isolated d pawn, you must not exchange the rooks. ------------------------------------------------------------------------------- 13 - Pos Barbero - Kouatly : ...Nxa2!! (Budapest 1987) Two passed pawns on the third rank are worth the quality. ------------------------------------------------------------------------------- 14 - Pos Spassky - Aftonomov : d5!! (Leningrad 1949) After 1.d5 Nbxd5 2.Bg5 Be7 3.Bxf6 gxf6 4.Nxd5 Bxd5 5.Bxd5 exd5 6.Nd4 the black king is stuck in the center. ------------------------------------------------------------------------------- 1 - Cmb Romanichine - Gdansky : Nxd6! (Polanica Zdroj 1992) 1...Bxd6 2.Qf6 Qxd5 3.Kh2 1-0 ------------------------------------------------------------------------------- 2 - Cmb Ed. Lasker - Thomas : Qxh7!! mate in 7 (Londres 1911) 1.Qxh7 Kxh7 2.Nxf6 Kh6 3.Neg4 Kg5 4.h4 Kf4 5.g3 Kf3 6.0-0 and 7.Nh2 # ------------------------------------------------------------------------------- 3 - Cmb Andruet - Spassky : ...Qf3!! (Bundesliga 1988) 2.gxf3 Nexf3 3.Kh1 Bh3 and mate on g2. ------------------------------------------------------------------------------- 4 - Cmb Vanka - Jansa : exf6! (Prague 1957) 1...Qxf4 2.Nxe6 Nxe6 3.Qxe6 Kb8 4.Ne2 Qc7 5.Rd7 Qc8 6.Qxf5 with a decisive advantage. ------------------------------------------------------------------------------- 5 - Cmb Boros - Szabo : Rxh7!! (Budapest 1937) 1...Kxh7 2.Rxf7 Rxf7 3.Qxg6 Kh8 4.Qxf7 1-0 ------------------------------------------------------------------------------- 6 - Cmb Lilienthal - Capablanca : exf6! (Hastings 1934) 1.exf6 Qxc2 2.fxg7 Kg8 3.Nd4 Qe4 4.Rae1 Nc5 5.Rxe4 Nxe4 6.Rfe1 Kxg7 7.Rxe4 1-0 ------------------------------------------------------------------------------- 7 - Cmb Rotlewi - Rubinstein : ...Rxc3!! (Lodz 1907) (2.gxh4 Rd2 3.Qxd2 Bxe4 4.Qg2 Rh3) or (2.Bxb7 Rxg3 3.Rc1 Rh3 4.Rc2 Re3 5.Qg2 Re1 6.Bc3 Rxf1 7.Qxf1 Ne3) ------------------------------------------------------------------------------- 8 - Cmb Zarkov - Mephisto : Nf6! (Albuquerque 1991) 1...gxf6 2.exf6 Rf8 3.Qf4 Kh8 4.Qg5 Rg8 5.Re8 Rxe8 6.Qg7 # ou 2...Be6 3.Qg4 Bxg4 4.Rxe8 # ------------------------------------------------------------------------------- 9 - Cmb Portisch - Kasparov : ...Rxd2! (Moscou 1981) 2.Qxd2 Qf3 3.Qg2 Ng3 4.hxg3 Qh5 5.Qh2 Qf3 6.Rg2 Qd1 and draw. ------------------------------------------------------------------------------- 10 - Cmb Tchoudinovskikh - Merchiev : Bxh6! (URSS 1987) 1...gxh6 2.g7 Be7 3.Rxe5 d5 4.Bh5 Bg5 5.Rxg5 hxg5 6.Qxg5 (3...Bg5 4.Rxg5 hxg5 5.Qxg5 and 6.Qh6) or (3...dxe5 4.Qb3 Kh7 5.Qf7) ------------------------------------------------------------------------------- 11 - Cmb Va‹sser - Genius 2 : Nxh7!! (Aubervilliers 1994) 1...Kxh7 2.Qh4 Kg8 3.Bh6 Bg4 4.Bg7 Bh5 5.Qg5 Ng4 6.h3 Nxf6 7.Rxf6 Kxg7 8.Rxg6 1-0 ------------------------------------------------------------------------------- 12 - Cmb Spassky - Petrossian : e5!! (World Championship Moscou 1969) 1...dxe5 2.Ne4 Nh5 3.Qg4 Nf4 4.Nf3 Qc7 5.Nh4 1-0 (Spassky played 3.Qg6 exd4 4.Ng5 1-0) ------------------------------------------------------------------------------- 1 - Fin X - Ed.Lasker : f6! (Virtual move - f4? was played instead) 1...gxf6 2.f4 Kd5 3.g5 fxg5 4.fxg5 Ke5 5.gxh6 Kf6 6.Kb3 and 1-0 ------------------------------------------------------------------------------- 2 - Fin Capablanca - Eliskases : f5!! (Moscou 1936) Or how to create a protected passed pawn with a temporary sacrifice. ------------------------------------------------------------------------------- 3 - Fin Etude: ...Bxe4! (?) 1...Bxe4 2.fxe4 f3 and white bishop is dead. ------------------------------------------------------------------------------- 4 - Fin Karpov - Deep Thought : ...h5 ? (New-York 1990) Only ... h3 ! can draw with 2.Rxh6 a3 3.Rxh3 Ra4 4.Rh1 a2 5.Ra1 Ke7. ------------------------------------------------------------------------------- 5 - Fin Karpov - Kasparov : a6! (Moscou 1984 - virtual move) 1...Bb3 2.Nxb3 Ra4 3.Nc5 Ra5 4.Re4 Kf7 5.Ra4 Rxa4 6.Nxa4 Bd4 7.Nc3 1-0 but Karpov played Rxd1 ? and the game was drawn. ------------------------------------------------------------------------------- 6 - Fin Minev - Portisch : ...f4!! (Halle 1967) If 2.gxf4 Bg4 3.Kd2 Nxd3 4.Kxd3 Bd1 and 5...Bxb3 ------------------------------------------------------------------------------- 7 - Fin Lengyel - Kaufman : Bb4!! (Los Angeles 1974) 1...cxb4 2.a6 Rc3 3.a7 Rc8 4.Rxb4 or 1...Rxb4 2.Rxb4 cxb4 3.a6 b3 4.a7 b2 5.a8=Q ------------------------------------------------------------------------------- 8 - Fin Spassky - Byrne : c5!! (1974) (1...dxc5 2.d6 Kd7 3.Bxc5 Bd8 4.Bb4 Ke6 5.Kc4 Bf6 6.Bc5 Bd8 7.Bd4 Kxd6 8.Be5 Ke6 9.Bb8) OR (1...bxc5 2.Be1 Kb8 3.Kc4 Kc8 4.Ba5 Bd4 5.Bd8 Be3 6.Bg5 Kb8 7.Kd3 Bc1 8.Bxh4 Bxf4 9.Be1 Kc7 10.Ba5 Kb8 11.h4 Bc1 12.h5 Bg5 13.Ke2 c4 14.Bd2 Bf6 15.h6 1-0 ) ------------------------------------------------------------------------------- 9 - Fin Klimenok- Kabanov : Kg4!! (URSS 1969) 1.fxg5 ? draw ! (white could not win because h8 is a black square) ------------------------------------------------------------------------------- >Thanks, >Scott
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