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Up Topic Rybka Support & Discussion / Rybka Discussion / Some work for the cluster
- - By Vinvin (***) Date 2009-08-02 14:57
Or for a strong centaure ...

Five positions from my test suite ( http://home.scarlet.be/vincentlejeune/hard-CCC-2008-beta3.pgn ) needs some verifications.

Would you mine to search the best move (and the best lines) ?

->

Wich is better 1.b4 or 1.Rxc6 ?

[Event "hard CCC 2008"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Pos"]
[Black "Deflection sacrifice"]
[Result "1-0"]
[SetUp "1"]
[FEN "r3k2r/4b2p/p1n3pN/1p1q1p2/5B2/3p1P2/PP4PP/2RQR2K w kq - 0 1"]
[PlyCount "3"]

{Junior - Chess Tiger, WMCCC Maastricht 2001} 1. Rxc6 $3  ({
May be as strong is :} 1. b4) 1... Qxc6 2. Qxd3 1-0

----------------------------------------------------------------------------------------

is 1.Qg4 as good as 1.Qg3 ?

[Event "hard CCC 2008"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Pos"]
[Black "King's attack"]
[Result "1-0"]
[SetUp "1"]
[FEN "2bk3r/q5b1/p2pp2p/1p6/1P6/5Q2/P1P2RPP/5R1K w - - 0 1"]
[PlyCount "10"]

1. Qg3 Qd4 2. Rf4 Qc3 3. Qh4+ Kc7 4. Qe7+ Kb8 5. R4f3 Qb2 1-0

----------------------------------------------------------------------------------------

Is 1.Nxb7 (deep move) better than 1.b6 (the rybka choice after some minutes) ?

[Event "hard CCC 2008"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Pos"]
[Black "Endgame/sac for 2 linked passed pawns"]
[Result "1-0"]
[SetUp "1"]
[FEN "6k1/1p1r1pp1/3p3p/NP1Pp1n1/P3P2n/8/5K1P/4RB2 w - - 0 1"]
[PlyCount "5"]

1. Nxb7 Rxb7 2. a5 Rc7 3. b6 1-0

----------------------------------------------------------------------------------------

What's the best way to trap and to take the rook ?
Rybka after some minutes prefere Rb8-Ra1-c3, the solution I had is RxNh5-Rb2-c3-Rc2-and then the king go to c4 (or c5) and b4 to take the rook

[Event "hard CCC 2008"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Pos"]
[Black "Trapped piece"]
[Result "1-0"]
[SetUp "1"]
[FEN "6k1/4pp1p/3p2p1/7n/p3P3/r4P2/P1PK2P1/1R5R w - - 0 1"]
[PlyCount "19"]

1. Rxh5 gxh5 2. Rb2 e6 3. c3 d5 4. exd5 exd5 5. Kd3 Kf8 6. Re2 f6 7. Kd4 Kf7 8.
Rc2 Ke6 9. Kc5 Ke5 10. Kb4 1-0

----------------------------------------------------------------------------------------

Is this complicated and deep sac correct ?

[Event "hard CCC 2008"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Pos"]
[Black "Positional squeeze"]
[Result "1-0"]
[SetUp "1"]
[FEN "r1b1r2k/pp1n1pp1/1qpb3p/8/3PB2B/5N2/PPQ2PPP/R3R1K1 w - - 0 1"]
[PlyCount "22"]

1. Bg6 $1 Rxe1+ 2. Rxe1 fxg6 3. Qxg6 {positional squeeze} Bf8 4. Qf7 Qb5 5. Re8
Qxb2 6. h3 Qc2 (6... Qb1+ 7. Kh2 Kh7 8. Ne5 Nxe5 9. dxe5 Qb4 10. g3 b5) 7. Ne5
Kh7 8. Nxd7 Bxd7 9. Rxa8 Qd1+ 10. Kh2 Bd6+ 11. Bg3 Qxd4 1-0
Parent - - By Akbarfan (***) Date 2009-08-08 12:12
Lukas is on vacation, but no Quad (OC) free for analyse this positions?
Hmm, remarkable.

Pos 1: 
1.b4 Rc8  2.Rc3 Rd8  3.Rc5 d2  4.Rxe7+      depth 24  +3.03

1.Rxc6 Qxc6  2.Qxd3 Td8  3.Qe3 Rd7  4.Bg5    depth 24  +2.79

1.Lg5 Ra7  2.Rxc6 Qxc6  3.Qxd3 Rd7  4.Qe3    depth 24  +2.79

Fritz11,  256 MB Hash,  multi-pv 3, C2D 3.0Ghz
Parent - By Vinvin (***) Date 2009-08-08 13:36
Thanks a lot !! I'll get this one out of the set !
Parent - By Dadi Jonsson (Silver) Date 2009-08-11 08:52
2bk3r/q5b1/p2pp2p/1p6/1P6/5Q2/P1P2RPP/5R1K w - - 0 1


> is 1.Qg4 as good as 1.Qg3 ?


IDeA sees them both as very strong and here is the result of 3-var IA (with Delta (or MulitPV_cp) set to 200):

[+2.53]  d=26  1.Qg3 Qd4 2.Rf4 Qc3 3.Qh4+ Kc7 4.R4f3 Qe5 5.Rf7+ Bd7 6.Qe7 Rd8 7.Rxg7 Qe2 8.Qf6 h5 9.Qc3+ Qc4 10.Qxc4+ bxc4 11.Rh7 d5 12.Rxh5 c3 13.Re5 Kd6 14.Rfe1 d4 15.a3 Re8 16.Ra5 (3:52.45) 4468284kN
[+2.40]  d=25  1.Qg4 Qd4 2.Rf4 Qe5 3.Rf7 Rg8 4.c3 Bd7 5.Qh4+ Qg5 6.Qe4 d5 7.Qh7 Be5 8.Rxd7+ Kc8 9.g3 Rg7 10.Rxg7 Qxg7 11.Qxg7 Bxg7 12.Rf3 Kd8 13.Kg2 Ke7 14.Kf2 e5 15.Rf5 Ke6 16.Rh5 (3:17.15) 3756555kN
[+0.00]  d=16  1.Qc6 Qd7 2.Qe4 Qe7 3.Rf7 Rf8 4.Qg6 Rxf7 5.Rxf7 Qh4 6.g3 Qxb4 7.Rxg7 Qe1+ 8.Kg2 Qe2+ 9.Kg1 Qe1+ 10.Kg2 Qe2+ 11.Kg1 Qe1+ 12.Kg2 Qe2+ 13.Kg1 Qe1+ 14.Kg2 Qe2+ 15.Kg1 Qe1+ 16.Kg2 (0:01.35) 37052kN

6k1/1p1r1pp1/3p3p/NP1Pp1n1/P3P2n/8/5K1P/4RB2 w - - 0 1


>Is 1.Nxb7 (deep move) better than 1.b6 (the rybka choice after some minutes) ?


Here 1.Nxb7 seems to be the best move (with an evaluation of +3 in both infinite analysis and IDeA), but 1.b6 is also quite good. Here is analysis of the position after that move:

[+1.88]  d=27  1...f5 2.exf5 Nxf5 3.Nxb7 Rxb7 4.a5 Rb8 5.a6 Rxb6 6.a7 Nh3+ 7.Bxh3 Ra6 8.Bxf5 Kf7 9.Rf1 Rxa7 10.h4 Kf6 11.Be4 Ke7 12.Rg1 Kf7 13.h5 Kf8 14.Rg6 Rf7+ 15.Ke3 Ke7 16.Bd3 Kd7 (8:08.26) 6395440kN
[+1.62]  d=26  1...f5 2.exf5 Nxf5 3.Nxb7 Rxb7 4.a5 Rb8 5.a6 Rxb6 6.a7 Nh3+ 7.Bxh3 Ra6 8.Bxf5 Kf7 9.Rf1 Rxa7 10.h4 g6 11.Be4 Kg7 12.Rg1 Rf7+ 13.Ke3 Rf6 14.Bc2 Kf7 15.Rg4 Kg7 16.Bd3 Kf7 (2:42.42) 2158224kN
[+1.62]  d=25  1...f5 2.exf5 Nxf5 3.Nxb7 Rxb7 4.a5 Rb8 5.a6 Rxb6 6.a7 Nh3+ 7.Bxh3 Ra6 8.Bxf5 Kf7 9.Rf1 Rxa7 10.h4 g6 11.Be4 Kg7 12.Rg1 Rf7+ 13.Ke3 Rf6 14.Bc2 Kf7 15.Rg4 Kg7 16.Bd3 Kf7 (1:48.17) 1408422kN
[+1.62]  d=24  1...f5 2.exf5 Nxf5 3.Nxb7 Rxb7 4.a5 Rb8 5.a6 Rxb6 6.a7 Nh3+ 7.Bxh3 Ra6 8.Bxf5 Kf7 9.Rf1 Rxa7 10.h4 g6 11.Be4 Kg7 12.Rg1 Rf7+ 13.Ke3 Rf6 14.Bc2 Kf7 15.Rg4 Kg7 16.Bd3 Kf7 (1:14.25) 943966kN
[+1.62]  d=23  1...f5 2.exf5 Nxf5 3.Nxb7 Rxb7 4.a5 Rb8 5.a6 Rxb6 6.a7 Nh3+ 7.Bxh3 Ra6 8.Bxf5 Kf7 9.Rf1 Rxa7 10.h4 g6 11.Be4 Kg7 12.Rg1 Rf7+ 13.Ke3 Rf6 14.Bc2 Kf7 15.Rg4 Kg7 16.Bd3 Kf7 (0:51.22) 646838kN
[+1.58]  d=22  1...f5 2.exf5 Nxf5 3.Nxb7 Rxb7 4.a5 Rb8 5.a6 Rxb6 6.a7 Nh3+ 7.Bxh3 Ra6 8.Bxf5 Kf7 9.Rf1 Rxa7 10.h4 g6 11.Be4 Kg7 12.Rg1 Rf7+ 13.Ke3 Rf6 14.Bc2 Kf7 15.Rg4 Kg7 16.Bd3 Kf7 (0:32.35) 411550kN
[+1.35]  d=21  1...f5 2.exf5 Nxf5 3.Nxb7 Rxb7 4.a5 Rb8 5.a6 Rxb6 6.a7 Nh3+ 7.Bxh3 Ra6 8.Bxf5 Kf7 9.Rf1 Rxa7 10.h4 Ra3 11.h5 Kf6 12.Bb1 (0:12.52) 162783kN
[+1.19]  d=20  1...f5 2.exf5 Nxf5 3.Nxb7 Rxb7 4.a5 Rb8 5.a6 Rxb6 6.a7 Nh3+ 7.Bxh3 Ra6 8.Bxf5 Kf7 9.Ke3 Rxa7 10.Bd3 Ra2 11.Re2 Rxe2+ 12.Bxe2 Kf6 13.Bd3 g6 14.Ke4 Kg5 15.Bb5 Kh4 16.Bd7 Kg5 (0:05.32) 70992kN
[+1.19]  d=19  1...f5 2.exf5 Nxf5 3.Nxb7 Rxb7 4.a5 Rb8 5.a6 Rxb6 6.a7 Nh3+ 7.Bxh3 Ra6 8.Bxf5 Rxa7 9.Rc1 Kf7 10.Ke3 Ra2 11.Rc6 (0:04.01) 51706kN
[+1.03]  d=18  1...f5 2.exf5 Nxf5 3.Nxb7 Rxb7 4.a5 Kf7 5.a6 Rxb6 6.a7 Nh3+ 7.Bxh3 Ra6 8.Bxf5 Rxa7 9.Ke3 g5 10.Re2 Ra3+ 11.Bd3 Ra4 12.Rf2+ Rf4 13.Rb2 Rh4 14.Bf1 (0:02.13) 27042kN
[+1.03]  d=17  1...f5 2.exf5 Nxf5 3.Nxb7 Rxb7 4.a5 Kf7 5.a6 Rxb6 6.a7 Nh3+ 7.Bxh3 Ra6 8.Bxf5 Rxa7 9.Ke3 g5 10.Rb1 Kf6 11.Bd3 Ra5 12.Rb7 Rxd5 13.Rh7 Rd4 14.Rxh6+ Ke7 15.Rh5 (0:01.43) 21166kN
[+1.03]  d=16  1...f5 2.exf5 Nxf5 3.Nxb7 Rxb7 4.a5 Kf7 5.a6 (0:01.35) 19442kN
[+0.23]  d=15  1...f5 2.exf5 Nxf5 3.Ba6 bxa6 4.b7 Rxb7 5.Nxb7 e4 6.Na5 e3+ 7.Kg2 Ne4 8.Nc4 (0:00.16) 3064kN
[+0.23]  d=14  1...f5 2.exf5 Nxf5 3.Ba6 bxa6 4.b7 Rxb7 5.Nxb7 e4 6.Na5 e3+ 7.Kg2 Ne4 8.Nc4 (0:00.15) 2830kN
[+0.16]  d=13  1...f5 2.exf5 Nxf5 3.Ba6 bxa6 4.b7 Rxb7 5.Nxb7 e4 6.Na5 Kf7 7.Nc4 g6 8.Ke2 Ke7 9.Rb1 Nh3 (0:00.09) 1540kN
[+0.00]  d=12  1...f5 2.exf5 Nxf5 3.Ba6 bxa6 4.b7 Nh3+ 5.Kf3 Ng5+ 6.Kg4 Rxb7 7.Nxb7 g6 8.Rc1 Kf7 9.Rc8 Kf6 10.Rf8+ Ke7 (0:00.03) 638kN
[+0.00]  d=11  1...f5 2.exf5 Nxf5 3.Ba6 bxa6 4.b7 Nh3+ 5.Kf3 Ng5+ 6.Kg4 Rxb7 7.Nxb7 g6 8.Rc1 Kf7 9.Rc8 Kf6 (0:00.03) 521kN
[+0.00]  d=10  1...f5 2.exf5 Nxf5 3.Ba6 bxa6 4.b7 Nh3+ 5.Kf3 Ng5+ 6.Kg4 Rxb7 7.Nxb7 g6 8.Rc1 Kf7 9.Rc8 Kf6 (0:00.02) 415kN
[+0.00]  d=9  1...f5 2.exf5 g6 3.fxg6 Nxg6 4.Rc1 Rf7+ 5.Ke3 Rf3+ 6.Ke2 Nf4+ (0:00.01) 274kN
[-0.08]  d=8  1...f5 2.exf5 Nxf5 3.Ba6 bxa6 4.b7 Rd8 5.Nc6 (0:00.01) 199kN
Up Topic Rybka Support & Discussion / Rybka Discussion / Some work for the cluster

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