Something to Add to the Aquarium and Let Rybka Nibble On

[Terry McCracken]

[d]3qr1k1/rp3pbp/2p3p1/3p1b2/N1nP4/P2NP3/1PQ2PPP/1BRR2K1 b - - 0 22

22..Rxe3!!

http://www.chessgames.com/perl/chessgame?gid=1060795

[swami]

Rybka 3?!

No..no.. even Glaurung 2.1 can find it in around 25 seconds.

Glaurung 2.1 @Q6600

Analysis by Glaurung 2.1 (JA):

1. -+ (-1.70): 1...Rxe3 2.fxe3 Nxe3 3.Qd2 Bxd4 4.Ndc5 Qg5 5.Kh1 Nxd1 6.Qxd1 Bg4 7.Qxd4 Qxc1+ 8.Qg1 Qd2 9.Nb3 Qd1 10.Nc3 Qxg1+ 11.Kxg1 Kg7 12.Kf2 Kf6
2. -/+ (-0.94): 1...Qg5 2.Nc3 b5 3.Qb3 Bg4 4.Nf4 Bxd1 5.Rxd1 Bf8 6.Bd3 Bd6 7.Nce2 Qe7 8.Bc2 Qh4 9.Bd3 Qg5 10.Rc1
3. -/+ (-0.90): 1...Bh6 2.Nac5 Nxe3 3.fxe3 Bxe3+ 4.Kh1 Bxd4 5.Rf1 Qh4 6.Qb3 Re2 7.Rc2 Re7 8.Ba2 Ra8 9.a4 Rae8 10.Rxf5 gxf5 11.Nxb7

[swami]

Bright 0.3a @Q6600.

Time: 18 Seconds.

Analysis by bright-0.3a:

Code: Select all

Analysis by bright-0.3a:

1...Bxd3 2.Rxd3 
  =  (-0.15)   Depth: 1/3   00:00:00
1...Ra8 
  =/+  (-0.45)   Depth: 1/3   00:00:00
1...Ra8 
  =/+  (-0.45)   Depth: 1/3   00:00:00
1...Ra8 
  =/+  (-0.45)   Depth: 1/3   00:00:00
1...Qg5 
  =/+  (-0.57)   Depth: 1/3   00:00:00
1...Qh4 
  =/+  (-0.59)   Depth: 1/3   00:00:00
1...Qh4 2.Nac5 Bg4 
  =  (-0.22)   Depth: 2/7   00:00:00
1...Bg4 2.Rf1 Qh4 
  =/+  (-0.55)   Depth: 2/7   00:00:00
1...Bg4 2.Rf1 Qh4 
  =/+  (-0.55)   Depth: 3/7   00:00:00
1...Bg4 2.Rf1 Qh4 3.Nac5 Nd6 
  =  (-0.17)   Depth: 4/8   00:00:00
1...Qg5 2.Nac5 Nxe3 3.fxe3 Qxe3+ 4.Kh1 Qxd4 
  =/+  (-0.54)   Depth: 4/10   00:00:00
1...Qg5 2.Nac5 b6 3.Nb3 Be4 
  =/+  (-0.65)   Depth: 5/19   00:00:00
1...Nxe3 2.fxe3 Rxe3 3.Nac5 Bxd4 4.Kh1 Qd6 
  -/+  (-0.84)   Depth: 5/19   00:00:00
1...Nxe3 2.fxe3 Rxe3 3.Nac5 Bxd4 4.Kh1 Qh4 5.Qb3 Rh3 
  -/+  (-0.73)   Depth: 6/19   00:00:00  36kN
1...Nxe3 2.fxe3 Rxe3 3.Nac5 Bxd4 4.Kh1 Qh4 5.Qb3 Rh3 
  -/+  (-0.73)   Depth: 7/22   00:00:00  89kN
1...Qg5 2.Nc3 Bh3 3.Nf4 Bg4 4.Re1 Bf3 
  -/+  (-0.91)   Depth: 7/22   00:00:00  130kN
1...Qg5 2.Nc3 Bh3 3.Nf4 Bg4 4.Re1 Bf3 5.Ba2 Nd6 
  -/+  (-0.80)   Depth: 8/22   00:00:00  203kN
1...Qg5 2.Nc3 Nxe3 3.fxe3 Rxe3 4.Qd2 Bxd4 5.Kh1 Ra8 6.Re1 Rae8 7.Rxe3 Rxe3 
  -/+  (-0.80)   Depth: 9/25   00:00:00  642kN
1...Qg5 2.Nc3 Bg4 3.Rf1 Bh3 4.Nf4 Bf5 5.Qb3 Nd2 6.Qb6 Nf3+ 7.Kh1 
  -/+  (-0.79)   Depth: 10/27   00:00:00  1706kN
1...Qg5 2.Nc3 Bg4 3.Rf1 Bh3 4.Nf4 Bf5 5.Qb3 Nd2 6.Qb6 Nf3+ 7.Kh1 
  -/+  (-0.79)   Depth: 11/34   00:00:01  3748kN
1...Qg5 2.Nc3 Bh3 3.Nf4 Bg4 4.Re1 Bf5 5.Qb3 Nd2 6.Qb6 Nf3+ 7.Kh1 Bxd4 8.exd4 Nxe1 9.Qxa7 Qxf4 
  =/+  (-0.67)   Depth: 12/34   00:00:02  10189kN
1...Qg5 2.Nc3 Ra6 3.Kh1 Rb6 4.Na4 Be4 5.Rg1 Bxd3 6.Qxd3 Nxb2 7.Nxb2 Rxb2 8.Bc2 Ra2 
  -/+  (-0.97)   Depth: 13/39   00:00:09  46265kN
1...Qg5 2.Nc3 Ra6 3.Kh1 Rb6 4.Na4 Be4 5.Rg1 Bxd3 6.Qxd3 Nxb2 7.Nxb2 Rxb2 8.Rc2 Rb5 9.a4 Rb4 
  =/+  (-0.54)   Depth: 14/41   00:00:13  68052kN
1...Rxe3 2.fxe3 Nxe3 3.Qd2 Bxd4 4.Ndc5 Qg5 5.Kh1 Nxd1 6.Qxd1 Bg4 7.Qe1 b5 8.Nb3 Rxa4 9.Nxd4 Rxd4 10.Qe8+ Kg7 11.Rxc6 
  =/+  (-0.59)   Depth: 14/41   00:00:18  89730kN
1...Rxe3 2.fxe3 Nxe3 3.Qd2 Bxd4 4.Ndc5 Qg5 5.Kh1 Nxd1 6.Qxd1 Bg4 7.Qf1 b5 8.Nb3 Be3 9.Nac5 Bxc1 10.Nxc1 Re7 
  -/+  (-0.96)   Depth: 15/54   00:00:41  205mN
1...Rxe3 2.fxe3 Nxe3 3.Qd2 Bxd4 4.Ndc5 Qg5 5.Kh1 Nxd1 6.Qxd1 Bg4 7.Qf1 b5 8.Nb3 Rxa4 9.Nxd4 Rxd4 10.Rxc6 Rc4 
  -/+  (-0.99)   Depth: 16/54   00:00:58  295mN
1...Rxe3 2.fxe3 Nxe3 3.Qd2 Bxd4 4.Ndc5 Qg5 5.Kh1 Nxd1 6.Qxd1 Bg4 7.Qxd4 Qxc1+ 8.Qg1 Qxg1+ 9.Kxg1 Kg7 10.Kf2 Kf6 11.h3 Bf5 12.Bxf5 Kxf5 13.g4+ Kf4 
  -/+  (-1.24)   Depth: 17/55   00:01:49  569mN
1...Rxe3 2.fxe3 Nxe3 3.Qd2 Bxd4 4.Ndc5 Qg5 5.Kh1 Nxd1 6.Qxd1 Bg4 7.Qxd4 Qxc1+ 8.Qg1 Qxg1+ 9.Kxg1 Kg7 10.h3 Bd1 11.Nb6 h5 12.Bd3 Kf6 13.Nbd7+ Kg5 
  -/+  (-1.17)   Depth: 18/56   00:03:12  1004mN

[plattyaj]

Yup, this isn't a hard one even for a pazter like Schola. It takes 18 seconds to lock onto it for good but it finds it the first time at 23ms:

Code: Select all

C:\chess\engines\schola_100>schola.exe
Welcome to Schola by Andy Platt. Version 1.0.1.
Book support courtesy of Ed Schroder; see http://www.geenvis.net/
Opening book authored by Jeroen Noomen
Logging initialized to schola-5948.log
setboard 3qr1k1/rp3pbp/2p3p1/3p1b2/N1nP4/P2NP3/1PQ2PPP/1BRR2K1 b - - 0 22
analyze
1 46 20 94 Nd6 Nac5
1 -74 20 188 Nxe3 fxe3
1 -74 20 499 Nxe3 fxe3
2 -74 20 557 Nxe3 fxe3
2 -74 20 803 Nxe3 fxe3
3 -74 20 931 Nxe3 fxe3 Bxd3
3 -224 20 1231 Bxd3 Qxd3 Rxa4
3 -224 20 3985 Bxd3 Qxd3 Rxa4
4 42 20 5720 Nd6 Nac5 Rf8 f4
4 37 21 7527 Rf8 Nac5 Bf6 f4
4 34 21 13426 b6 Qb3 Rf8 Nc3
4 31 21 17260 Ra5 Qb3 Rb5 Qc3
4 -51 23 27143 Rxe3 Nac5 Bg4 f3
4 -51 23 27976 Rxe3 Nac5 Bg4 f3
5 -174 25 36698 Rxe3 fxe3 Nxe3 Qc3 Nxd1
5 -180 28 74548 Bh6 Qb3 Bxd3 Bxd3 Rxa4
5 -180 29 80867 Bh6 Qb3 Bxd3 Bxd3 Rxa4
6 -74 31 107154 Bh6 Qb3 Bg4 Nc3 Na5 Qb4
6 -74 40 181714 Bh6 Qb3 Bg4 Nc3 Na5 Qb4
7 -93 50 267581 Bh6 Qb3 Rxe3 fxe3 Bxe3+ Nf2 Bxc1 Bxf5
7 -100 64 416224 Nxe3 fxe3 Bh6 Nac5 Bxe3+ Kh1 b6 g4
7 -154 82 607412 Rxe3 fxe3 Nxe3 Qc5 Ra5 Qxa5 Qxa5
7 -154 170 1464600 Rxe3 fxe3 Nxe3 Qc5 Ra5 Qxa5 Qxa5
8 -148 204 1814231 Rxe3 Qc3 Bxd3 Bxd3 Rxd3 Qxd3 Rxa4 f4
8 -148 271 2410325 Rxe3 Qc3 Bxd3 Bxd3 Rxd3 Qxd3 Rxa4 f4
9 -127 331 2996301 Rxe3 fxe3 Nxe3 Qb3 Bxd4 Re1 Nc4+ Nf2 Nd2 Qb4
9 -128 526 4871130 Bh6 Qb3 Nxe3 fxe3 Bxe3+ Kh1 Rxa4 Qxa4 b5 Qa6
9 -147 637 6005035 Nxe3 fxe3 Rxe3 Nac5 Bxd4 Kh1 Rxd3 Nxd3 Bxd3
9 -147 1309 12656857 Nxe3 fxe3 Rxe3 Nac5 Bxd4 Kh1 Rxd3 Nxd3 Bxd3
10 -135 1406 13585675 Nxe3 fxe3 Rxe3 Kh1 Bxd4 Nc3 c5 Qd2 Rxd3 Bxd3
10 -154 1854 17668505 Rxe3 fxe3 Nxe3 Qc3 Nxd1 Rxd1 Rxa4 Ne5 Be6 Bd3

Andy.

[Terry McCracken]

Rybka 3?!

No..no.. even Glaurung 2.1 can find it in around 25 seconds.

Glaurung 2.1 @Q6600

Analysis by Glaurung 2.1 (JA):

1. -+ (-1.70): 1...Rxe3 2.fxe3 Nxe3 3.Qd2 Bxd4 4.Ndc5 Qg5 5.Kh1 Nxd1 6.Qxd1 Bg4 7.Qxd4 Qxc1+ 8.Qg1 Qd2 9.Nb3 Qd1 10.Nc3 Qxg1+ 11.Kxg1 Kg7 12.Kf2 Kf6
2. -/+ (-0.94): 1...Qg5 2.Nc3 b5 3.Qb3 Bg4 4.Nf4 Bxd1 5.Rxd1 Bf8 6.Bd3 Bd6 7.Nce2 Qe7 8.Bc2 Qh4 9.Bd3 Qg5 10.Rc1
3. -/+ (-0.90): 1...Bh6 2.Nac5 Nxe3 3.fxe3 Bxe3+ 4.Kh1 Bxd4 5.Rf1 Qh4 6.Qb3 Re2 7.Rc2 Re7 8.Ba2 Ra8 9.a4 Rae8 10.Rxf5 gxf5 11.Nxb7

I don't have Rybka 3 or or a 64bit computer, just a simple 32bit single core AMD @ 1.8 Ghz, and Rybka 2.2n2 has trouble with this position.

[Leto]

Rybka 3 is far different from Rybka 2.3.2, she is much more tactical now, R3 solves this one in less than a second.

Analysis by Rybka 3:
[-1.60] d=17 1...Rxe3 2.fxe3 Nxe3 3.Qd2 Nxd1 4.Qxd1 (0:01.41)
[-1.43] d=16 1...Rxe3 2.fxe3 Nxe3 3.Qd2 Nxd1 4.Qxd1 (0:00.45)
[-1.23] d=15 1...Rxe3 2.fxe3 Nxe3 3.Qd2 Nxd1 4.Qxd1 Bxd4 5.Kh1 (0:00.19)
[-1.14] d=14 1...Rxe3 2.fxe3 Nxe3 3.Qd2 Nxd1 4.Qxd1 Bxd4 (0:00.06)
[-1.14] d=13 1...Rxe3 2.fxe3 Nxe3 3.Qd2 Nxd1 4.Qxd1 Bxd4 (0:00.04)
[-1.14] d=12 1...Rxe3 2.fxe3 Nxe3 3.Qd2 Nxd1 4.Qxd1 Bxd4 5.Kh1 Be3 6.Rc3 d4 7.Rc5 Bxd3 8.Bxd3 b5 9.Rxc6 bxa4 10.Rc4 Rb7 11.Qc2 Qa5 12.g3 Rb3 (0:00.02)
[-1.01] d=11 1...Rxe3 2.fxe3 Nxe3 3.Qd2 Nxd1 4.Qxd1 (0:00.01)
[³/-0.91] d=10 1...Rxe3 (0:00.01)
[-0.71] d=9 1...Rxe3 2.fxe3 Nxe3 3.Qd2 Nxd1 4.Ndc5 Bxb1 5.Rxb1 b5 6.b3 bxa4 (0:00.00)
[-0.60] d=8 1...Rxe3 2.fxe3 Nxe3 3.Qd2 Nxd1 4.Qxd1 Bxd4 (0:00.00)
[-0.40] d=8 1...Rxe3 (0:00.00)
[=/-0.20] d=7 1...Rxe3 2.fxe3 Nxe3 3.Qb3 Qg5 (0:00.00)
[-0.11] d=7 1...Qg5 2.Nc3 Ra6 3.Kh1 Bxd3 (0:00.00)
[=/-0.22] d=6 1...Qg5 2.Nc3 Ra6 3.Kh1 Bxd3 (0:00.00)
[-0.14] d=6 1...Rxe3 2.fxe3 Nxe3 (0:00.00)
[-0.06] d=6 1...Bxd3 2.Rxd3 Rxa4 3.Qxa4 Nxb2 4.Qb4 (0:00.00)
[+0.01] d=6 1...Qa5 2.Nac5 b6 3.Nb3 Qb5 4.Qc3 (0:00.00)
[=/-0.18] d=5 1...Qa5 2.Nac5 b6 3.Nb3 Qb5 4.Qc3 (0:00.00)
[-0.16] d=4 1...Bxd3 2.Rxd3 Rxa4 3.Qxa4 Nxb2 4.Qb4 (0:00.00)