Ivanhoe v81 is available for download

[zullil]

Windows executables at http://www.chesslogik.com/

I didn't see source code.

[yanquis1972]

yes, some testing has been done. while it supports mpv (I hope M ANSARI will take a look at it as he has commented he would like to compare mpv output of rybka + clones) from what i've read i don't believe it is any stronger than Igorrit and may be a bit weaker.

[kingliveson]

yes, some testing has been done. while it supports mpv ... from what i've read i don't believe it is any stronger than Igorrit and may be a bit weaker.

It all depends on what is taken out and add before the compile. As you may have heard, igorrit v5 was the strongest until v9 was released. IvanHoe 999981 beta is just as strong, if not a little stronger.

[yanquis1972]

are you sure v9 is stronger than v5, and that it won't freeze after long analysis? i am getting excellent results with v5 at long TC against rybka and am hesitant to switch, but will if v9 is stable.

[kingliveson]

are you sure v9 is stronger than v5, and that it won't freeze after long analysis? i am getting excellent results with v5 at long TC against rybka and am hesitant to switch, but will if v9 is stable.

No, as I am only speculating from what I have heard. I have not tested v9. But my testing shows Ivanhoe 999981 scores are similar to igorrit v5. To your question about multiPV, here is a position with 16 moves considered analyzed side by side by both Rybka and IvanHoe:

[d]1qr2r1k/1p1bbppp/pB1ppn2/P7/4P3/2N2Q2/1PP1BPPP/R2R2K1 b - - 0 1

Code: Select all

1qr2r1k/1p1bbppp/pB1ppn2/P7/4P3/2N2Q2/1PP1BPPP/R2R2K1 b - - 0 1

Analysis by IvanHoe 9.81b x64:

1. =  (0.17): 17...Bc6 18.Qe3 Kg8 19.Rd2 Rfe8 20.Qf4 Rf8 21.h3 Nd7 
2. =  (0.23): 17...Kg8 18.Qg3 Bc6 19.Bf3 Nd7 20.Bd4 Ne5 21.Be2 Ng6 
3. =  (0.23): 17...h6 18.Qg3 Bc6 19.Bf3 Nh7 20.h4 Nf6 21.Bd4 Bd8 22.Bg4 Rg8 23.Rd2 Bc7 24.Qf3 Bd8 25.b4 Qc7 26.Rad1 Be7 27.Bh3 
4. =  (0.25): 17...Be8 18.Qg3 Bc6 19.Bf3 Nd7 20.Bd4 Ne5 21.Bh5 Qc7 22.Rd2 Kg8 23.Be2 Bf6 24.Bb6 Qe7 25.Rad1 Ng6 26.Qxd6 Qxd6 
5. +/=  (0.30): 17...Bd8 18.Qe3 Bxb6 19.axb6 Bc6 20.Bf3 d5 21.exd5 Bxd5 22.Bxd5 exd5 23.Nxd5 Nxd5 24.Rxd5 Rxc2 25.Rd7 Re8 26.Qf3 Rce2 27.g3 R2e7 28.Qf5 Rxd7 29.Qxd7 Kg8 
6. +/=  (0.33): 17...Rg8 18.Qg3 Bc6 19.Bf3 Nd7 20.Bd4 Qc7 21.Rd2 Ne5 22.Be2 Ng6 23.Bb6 Qd7 24.Rad1 Rge8 25.Be3 Qc7 
7. +/=  (0.33): 17...Rce8 18.Qg3 Rc8 19.f4 e5 20.Qe3 Bc6 21.f5 Nd7 22.Qf2 Nxb6 23.axb6 Bg5 
8. +/=  (0.33): 17...e5 18.Qd3 Be6 19.Bf3 h6 20.h3 Rfe8 21.Rac1 Kg8 22.b3 
9. +/=  (0.34): 17...Rfe8 18.Qg3 Rc6 19.Qe3 Rcc8 20.Ba7 Qc7 21.h3 Bc6 22.Bb6 Qb8 23.Bd4 Kg8 24.Ba7 Qa8 25.Bf3 
10. +/=  (0.34): 17...Qa8 18.Bd4 Qb8 19.h3 Bc6 20.Qe3 Kg8 21.Bd3 e5 22.Bb6 Nd7 23.Ba7 Qc7 24.Nd5 
11. +/=  (0.34): 17...Ne8 18.Qg3 Nf6 19.f4 e5 20.Qe3 Bc6 21.f5 Nd7 22.Qf2 Nxb6 23.axb6 Bg5 
12. +/=  (0.34): 17...Rc6 18.Qe3 Rcc8 19.Ba7 Qc7 20.h3 Kg8 21.Rd2 Bc6 22.Bb6 Qb8 23.Rad1 h6 24.f4 Rfe8 25.e5 dxe5 26.fxe5 
13. +/=  (0.35): 17...Ng8 18.Qg3 Nf6 19.f4 e5 20.Qe3 Bc6 21.f5 Nd7 22.Qf2 Nxb6 23.axb6 Bg5 
14. +/=  (0.40): 17...g6 18.Be3 Kg7 19.Bd3 Kg8 20.Re1 Bc6 21.Bg5 Kg7 22.Na4 h6 23.Be3 d5 24.e5 Ne4 25.Nb6 Qxe5 26.Nxc8 Rxc8 27.c3 Qc7 28.Bc2 e5 29.Qh3 h5 
15. +/=  (0.51): 17...h5 18.Rd3 Kg8 19.Rad1 Rfe8 20.Qf4 Rc4 21.b3 Rb4 22.Bf3 Qc8 23.Re1 Bc6 24.Rxd6 Qb8 25.Bc5 Bxd6 
16. +/-  (0.72): 17...d5 18.exd5 Bd6 19.g3 Be5 20.dxe6 Bxe6 21.Rd2 Rfe8 22.Rad1 Bxc3 23.bxc3 Bg4 24.Qd3 Bxe2 25.Rxe2 Rxe2 26.Qxe2 Re8 27.Qf3 Kg8 28.Bd4 Ne4 

(, Microsoft 14.01.2010)

Code: Select all

1qr2r1k/1p1bbppp/pB1ppn2/P7/4P3/2N2Q2/1PP1BPPP/R2R2K1 b - - 0 1

Analysis by Rybka 3:

1. =  (0.15): 17...Bc6 18.Qe3 Kg8 19.Ba7 Qc7 20.h3 h6 21.Bb6 Qb8 
2. =  (0.15): 17...Kg8 18.Qe3 Bc6 19.Ba7 Qc7 20.h3 h6 21.Bb6 Qb8 
3. =  (0.20): 17...Rfe8 18.Qe3 Kg8 19.Ba7 Qc7 20.Qg3 Bc6 21.Bd4 g6 22.Bb6 Qb8 23.Qf4 Nd7 24.Be3 Qc7 25.h3 Nc5 26.b4 e5 
4. =  (0.22): 17...h6 18.Qe3 Rfe8 19.h3 Kg8 20.Ba7 Qc7 21.Qg3 e5 
5. =  (0.24): 17...Be8 18.Qe3 Bc6 19.Ba7 Qc7 20.Bd4 Nd7 
6. +/=  (0.26): 17...Bd8 18.Qe3 Bc6 19.Bd4 Kg8 20.Ba7 Qc7 21.Bb6 Qb8 22.Rd2 
7. +/=  (0.26): 17...Rce8 18.Qe3 Bc6 19.Ba7 Qc7 20.Bd4 Rc8 21.Qg3 Rg8 22.Bb6 Qb8 
8. +/=  (0.30): 17...Rg8 18.h3 Bc6 19.Bd4 Rge8 20.Bd3 h6 21.Na4 e5 22.Bc3 d5 23.exd5 Bxd5 24.Qe3 e4 
9. +/=  (0.31): 17...Rc6 18.Qe3 Rcc8 19.Ba7 Qc7 20.h3 Kg8 21.Bb6 Qb8 
10. +/=  (0.34): 17...Ne8 18.Bd4 Nf6 19.h3 Bc6 20.Qe3 Qc7 21.Bb6 Qb8 
11. +/=  (0.34): 17...Ng8 18.Bd4 Nf6 19.h3 Bc6 20.Qe3 Qc7 21.Bb6 Qb8 
12. +/=  (0.34): 17...Qa8 18.Qe3 Bc6 19.Bd4 Qb8 20.h3 Qc7 21.Bb6 Qb8 
13. +/=  (0.34): 17...e5 18.Qd3 Be6 19.Bf3 h6 20.h3 Kg8 21.b3 Nd7 22.Na4 Bd8 23.c4 Rc6 24.Qe3 
14. +/=  (0.38): 17...g6 18.Be3 Bc6 19.Bg5 Kg7[] 20.Qf4 Rfe8 21.Rd3 d5 22.e5 Nd7 23.Bxe7 Rxe7 24.Rh3 h5 25.Re3 Ree8 
15. +/=  (0.46): 17...h5 18.h3 Kg8 19.Qe3 Rfe8 20.Bd4 Bd8 21.Ba7 Qc7 22.Bb6 Qb8 23.Rd3 Bc6 24.Qf4 Be7 
16. +/=  (0.58): 17...g5 18.Qe3 Rg8 19.Re1 Rg6 20.Rad1 Kg8 21.h3 g4 22.hxg4 Nxg4 23.Qh3 Nf6 24.f4 Bc6 

(, Microsoft 14.01.2010)

[kingliveson]

are you sure v9 is stronger than v5, and that it won't freeze after long analysis? i am getting excellent results with v5 at long TC against rybka and am hesitant to switch, but will if v9 is stable.

Code: Select all

    Program                          Elo    +   -   Games   Score   Av.Op.  Draws

  1 IvanHoe 9.81b x64              :   21   41  40   100    54.5 %    -10   65.0 %
  2 Igorrit version 0086v5         :   -9   38  39   100    48.0 %      5   68.0 %
  3 Igorrit 0.086v9_x64            :  -12   40  41   100    47.5 %      6   65.0 %

What does this tells us? Nothing! I suspect they are all of equal strength coming from the same source with little fixes here and there. See the details here.

[Tomcass]

Quad 2.67 Gz $ Gz Mem RAM. w32.

Game in 10 minutes.
Book: Paradigm.
All engines 4 threads.
Ponder: Offf.
GUI: Fritz 11.

Only one time loss, in an even position, for IvanHoe against Rybka. Clear win for Igorrit (Version 9 although it states V8) and surprisingly strong performance by Deep Shredder 12.

2010-01-Ivanhoe-1 2010

1 2 3 4
1 Igorrit 0.086v8_w32 ********** ½½01½½½11½ ½½½0½1½1½½ 0½½½1½1½½1 17.5/30
2 IvanHoe 84-Beta (x4) ½½10½½½00½ ********** 01½1½½½½½1 11½100½½0½ 15.0/30
3 Deep Shredder 12 UCI ½½½1½0½0½½ 10½0½½½½½0 ********** ½½10011½½½ 14.0/30
4 Rybka 3 32-bit (x4) 1½½½0½0½½0 00½011½½1½ ½½01100½½½ ********** 13.5/30

If anyone is interested in the games, please let me know.

Regards,

Tom.

[noctiferus]

84?
it seems 81 being stronger...

[Tomcass]

I am not sure which is the strongest one. Let's keep testing...

Regards,

Tom.