The Arasan 8 unresolved positions:

[jdart]

I haven't done a super deep look at this but from what I have seen so far Toga likes Bb4 better than c4 but not by a lot:

After forcing Bb4 (scores from White side):
Fen: r5k1/1bq2p1p/p2p2pB/Pppn4/1b4P1/1N3N1P/4RP2/1B1Q2K1 w - - 0 1
Bm: Qd3

no 1 0 -39 5 Ba2
no 1 0 -17 9 Bc2
no 1 0 +4 13 Bd3
no 2 0 -19 645 Bd3 c4 Be4
no 2 0 -15 934 Bg5 Nf4
no 2 0 +26 1163 Be4 Qc6
no 3 20 -193 10381 Be4 Nc3 Bxb7 Nxd1 Bxa8 Bxa5
yes 3 20 -73 12915 Qd3 Nc3 Re1 Nxb1 Rxb1
no 3 30 -27 14539 Bd2 Bxd2 Qxd2 b4 Bd3
no 4 30 -79 17366 Bd2 Nc3 Bxc3 Bxc3 Be4
no 5 50 -117 25293 Bd2 Nc3 Bxc3 Bxf3 Be4 Bxe2 Qxe2 Bxc3 Bxa8
no 5 60 -92 32798 Qf1 Nc3 Re3 Nxb1 Qxb1 c4 Qc2 Bxf3 Rxf3
Bxa5 Nxa5 Qxa5
no 6 90 -98 48322 Qf1 c4 Nbd4 Nc3 Re3 Nxb1 Qxb1 Qxa5
no 6 140 -90 70299 Qc2 Nc3 Re3 Nxb1 Qxb1 Bxf3 Rxf3 Bxa5
no 7 200 -112 105556 Qc2 c4 Nbd4 Nc3 Re3 Nxb1 Qxb1 Bxa5 Bf4
no 7 220 -102 114976 Qf1 c4 Nbd4 Nc3 Rb2 Ba3 Rc2 Qxa5
no 8 340 -103 181978 Qf1 c4 Nbd4 Nc3 Re3 Nxb1 Qxb1 Bxa5 Ng5 d5
Qb2
no 9 620 -101 327756 Qf1 c4 Nbd4 Nc3 Re3 Nxb1 Qxb1 Bxa5 Bg5
Bxf3 Nxf3 d5 Re7
no 10 1220 -93 650942 Qf1 c4 Nbd4 Nc3 Re3 Nxb1 Qxb1 Qxa5 Re7
Bxf3 Nxf3 d5 Rd7 Qa3
no 11 2380 -106 1257611 Qf1 Nc3 Re3 Bxf3 Rxf3 c4 Nd4 Qc5 Ne2 Nxb1
Qxb1 Bxa5 Qb2 Qe5
no 12 6280 -96 3298484 Qf1 Qd7 Bd2 Re8 Ng5 Rxe2 Qxe2 Nc3 Bxc3
Bxc3 Be4 Qe7 Qe3 Bxe4 Nxe4
no 12 12580 -81 6565850 Qc1 c4 Nbd4 Nc3 Re3 Nxb1 Qxb1 Qxa5 Re7
Bd5 Qb2 Qa3 Qe2 Qa1+ Kh2
no 13 30450 -85 15790839 Qc1 Rb8 Rc2 c4 Qb2 c3 Qa2 Nf6 Nfd4 Re8
Re2 Qc4 Rxe8+ Nxe8 Bf4 Nf6 f3
no 14 55080 -94 28397796 Qc1 Rb8 Ng5 c4 Nd4 Bc3 Qd1 Bxa5 Ne4 Bb4
Bc2 Re8 f3 Qd7 Bf4
no 15 112310 -104 57567949 Qc1 c4 Nbd4 Bxa5 Bf5 Qb6 Qg5 Qd8 Be4 Qxg5
Bxg5 b4 Bd2 c3 Bg5 Bb6 Kg2 a5 Re1 f5
no 16 175900 -116 90772371 Qc1 c4 Nbd4 Bxa5 Bf5 Qb6 Qg5 Qd8 Bc2 Qxg5
Bxg5 f6 Bh4 Nb4 Bb1 Bxf3 Nxf3 Nd5 Bg3
no 16 217190 -111 112244112 Qf1 c4 Nbd2 Nc3 Re3 Qxa5 Qe1 Bc6 Bc2 Nd5
Re2 Qb6 Kg2 Nf6 Be3 Bxf3+ Nxf3 Qxe3 Rxe3
Bxe1 Rxe1
no 17 335930 -112 173744178 Qf1 c4 Nbd2 Nc3 Re3 Qxa5 Qe1 Bc6 Bc2 Nd5
Re2 Qb6 Kg2 Rd8 Qf1 a5 Ne4 Re8 Qa1


After forcing c4 (Scores from White side):
Fen: r5k1/1bq2p1p/p2p2pB/Pp1n4/2p3P1/1Nb2N1P/4RP2/1B1Q2K1 w - - 0 1
Bm: Nd4

no 1 0 -224 14 Ba2 cxb3 Bxb3
no 1 0 -45 49 Be4
no 2 10 -48 762 Be4 Re8 Bxd5 Rxe2 Bxb7 Qxb7 Qxe2 cxb3
no 3 20 -41 7290 Be4 Re8 Nbd4
no 4 20 -60 8955 Be4 Nf6 Bxb7 Qxb7 Nbd4 Bxa5
yes 4 20 -53 10289 Nbd4 Qxa5 Be4 Qa3
yes 5 40 -94 22594 Nbd4 Bxa5 Bd2 Bxd2 Qxd2 c3 Qg5
no 5 50 -60 24340 Be4 Nf6 Bxb7 Qxb7 Nbd4 Bxa5
no 6 70 -75 33085 Be4 Nf6 Bxb7 Qxb7 Nbd4 Bxa5 Bf4
no 7 110 -68 53794 Be4 Nf6 Bxb7 Qxb7 Nbd4 Bxa5 Qa1 Bb4
no 8 180 -85 93461 Be4 Nf6 Bxb7 Qxb7 Nbd4 Bxa5 Qa1 Bb6 Nc6
no 9 330 -71 176953 Be4 Nf6 Bxb7 Qxb7 Nbd4 Bxa5 Qa1 Bb6 Nc6
Qxc6 Qxf6
no 10 610 -94 320462 Be4 Nf6 Bxb7 Qxb7 Nbd4 Bxa5 Qa1 Bb6 Qe1
Qd5 Qc3 Bxd4 Nxd4
no 11 1310 -94 688220 Be4 Nf6 Bxb7 Qxb7 Nbd4 Bxa5 Qa1 Bb6 Kg2
Bxd4 Qxd4 Re8 Rxe8+ Nxe8 Bf4
no 12 2810 -93 1476222 Be4 Nf6 Bxb7 Qxb7 Nbd4 Ne4 Re3 d5 Ne2 Bf6
Nf4 Rd8 Nd2 Nxd2 Qxd2
no 13 7000 -80 3654510 Be4 Nf6 Bxb7 Qxb7 Nbd4 b4 Qc1 Ne4 Qf4 Re8
Ng5 Bxd4 Nxe4 Qc6 Nf6+ Bxf6 Rxe8+ Qxe8
Qxf6
no 14 12970 -78 6812250 Be4 Nf6 Bxb7 Qxb7 Nbd4 b4 Qc1 Nd5 Qc2
Bxd4 Nxd4 Nc3 Re1 Qd5 Qd2 Ne4 Qf4 Qxd4
Rxe4
no 15 20720 -78 10860328 Be4 Nf6 Bxb7 Qxb7 Nbd4 b4 Qc1 Nd5 Qc2
Bxd4 Nxd4 Nc3 Re1 Qd5 Qd2 Ne4 Qf4 Qxd4
Rxe4
no 16 37900 -79 20001696 Be4 Nf6 Bxb7 Qxb7 Nbd4 b4 Qc1 Nd5 Qc2
Bxd4 Nxd4 Nc3 Re3 Rc8 Qc1 Ne4 f3 Nc3 Bf4
no 17 74890 -87 39675520 Be4 Nf6 Bxb7 Qxb7 Nbd4 b4 Qc1 Nd5 Qc2
Bxd4 Nxd4 Nc3 Re3 d5 Qc1 Rb8 Bf4 Rc8 f3
Qd7 Qd2
no 18 214640 -75 113851901 Be4 Nf6 Bxb7 Qxb7 Nbd4 b4 Qc1 Nd5 Qc2
Bxd4 Nxd4 Nc3 Re3 Rc8 Qc1 Nd5 Re2 Qc7 Bf4
Qc5 Qd2
no 19 476560 -76 249949146 Be4 Nf6 Bxb7 Qxb7 Nbd4 Re8 Rxe8+ Nxe8 Bd2
Bxd4 Nxd4 Nf6 Bb4 Qd5 Qd2 Nd7 Bc3 Nc5 Qe3
Qe5 Nf3 Qxe3 fxe3 Nd3

[Dann Corbit]

[d]r1b1k2r/pp3pp1/2npp2p/4P3/1b1P2q1/2NB1N2/PP1Q1PPP/R3K2R w KQkq - bm h3; id "arasan6.9";

Code: Select all

9) h3; id "arasan6.9";  
    Searching move: h2-h3
    Best move (Rybkav2.3.2a.w32): 0-0
    Not found in: 15:00
      5	00:01	       2.133	45.504	+0.44	00 d6xe5
      6	00:01	       4.500	58.329	+0.40	00 d6xe5 d4xe5 00
      7	00:02	       8.658	15.747	+0.48	00 d6xe5 d4xe5 00 h2h3
      8	00:02	      16.708	24.867	+0.44	00 d6xe5 d4xe5 00 h2h3 Qg4h5
      9	00:02	      30.242	31.925	+0.43	00 d6xe5 d4xe5 00 h2h3 Qg4h5 Qd2f4
     10	00:03	      53.684	37.018	+0.39	00 d6xe5 d4xe5 00 h2h3 Qg4h5 Qd2f4 Rf8d8
     11	00:03	     110.431	47.915	+0.43	00 d6xe5 d4xe5 00 h2h3 Qg4h5 Qd2f4 f7f6 e5xf6 Rf8xf6 Qf4g3
     12	00:07	     284.813	49.633	+0.49	00 d6xe5 d4xe5 00 h2h3 Qg4h5 Qd2f4 f7f6 e5xf6 Rf8xf6 Qf4g3 Bc8d7
     13	00:14	     526.141	41.943	+0.46	00 d6xe5 d4xe5 00 h2h3 Qg4h5 Qd2f4 f7f6 e5xf6 Rf8xf6 Qf4g3 Bc8d7 Ra1c1
     14	00:24	     937.382	42.512	+0.47	00 d6xe5 d4xe5 00 h2h3 Qg4h5 Qd2f4 f7f6 e5xf6 Rf8xf6 Qf4g3 Bb4xc3 b2xc3 Qh5c5
     15	00:39	   1.903.848	51.856	+0.47	00 d6xe5 d4xe5 00 h2h3 Qg4h5 Qd2f4 f7f6 e5xf6 Rf8xf6 Qf4g3 Bb4xc3 b2xc3 Qh5c5
     16	01:04	   3.417.811	55.442	+0.47	00 d6xe5 d4xe5 00 h2h3 Qg4h5 Qd2f4 f7f6 e5xf6 Rf8xf6 Qf4g3 Bc8d7 Ra1c1 Ra8d8
     17	04:39	  13.139.162	48.427	+0.54	00 d6xe5 d4xe5 00 a2a3 Bb4e7 Rf1d1 Qg4h5 Qd2f4 f7f5 e5xf6/ep Be7xf6 Qf4e4 Qh5f5
   12/7/2007 12:41:38 AM, Time for this analysis: 00:15:01, Rated time: 1:16:35

Wrong colour.

I do not understand what you mean. If it were black to move, there is no possible pawn push to h3. Do you mean one of the chessmen is the wrong color or something else?

[Dann Corbit]

Here is a summary list of the analysis that I ran (I did not combine it with Jon Dart's yet). It shows the positions that Rybka did not solve in 900 seconds (with the pm containing Rybka's choice).

Code: Select all

r4rk1/1pp3q1/2np3p/p2Npb1B/2PbN1p1/3P2P1/PP4PP/R2Q1R1K w - - bm Ndf6+ Nef6+; id "arasan4.75"; pm Bxg4;
4qrk1/1p1nb1p1/2p1pn1p/r2p4/3P1BPP/P1NBP3/5P2/R2QK1R1 w - - bm g5; id "arasan5.14"; pm Qb1;
r1b1k2r/pp3pp1/2npp2p/4P3/1b1P2q1/2NB1N2/PP1Q1PPP/R3K2R w KQkq - bm h3; id "arasan6.9"; pm O-O;
8/8/1p3R2/p7/P1p1kn1P/1r3p2/7P/5R1K w - - bm Rc6 h5; id "arasan6.21"; pm Rf8;
r5k1/1bq2p1p/p2p2pB/Pppn4/6P1/1Nb2N1P/4RP2/1B1Q2K1 b - - bm Bb4; id "arasan7.6"; pm c4;
8/8/6k1/P7/1P6/r5pp/8/2R2K2 b - - bm Ra2 Rc1-b1; id "arasan7.27"; pm Kf5;
6k1/p1b3pp/2p3r1/p1Pr1p1q/2QPp3/PP5P/3B1PP1/1R2RK2 b - - bm Rxg2; id "arasan8.13"; pm f4;
r2r4/pp2k2p/4p1p1/q7/2PR1Pb1/4QN2/P3R1PP/6K1 w - - bm f5; id "arasan8.19"; pm Kf2;
r3kb1r/1bqn1ppp/p3pn2/8/1p1NP3/1BN5/PP2QPPP/R1BR2K1 w kq - bm Nd5; id "Bolbochan-Najdorf, ARG-ch m Buenos Aires 1949"; pm Na4;
r4rk1/p4ppp/qp2p3/b5B1/n1R5/5N2/PP2QPPP/1R4K1 w - - bm Bf6; id "Alekhine-Sterk, Budapest 1921"; pm Nd4;
3q1rk1/pr1b1p1p/1bp2p2/2ppP3/8/2P1BN2/PPQ3PP/R4RK1 w - - bm Bh6; id "Shredder-Rybka, WCCC 2006"; pm Rae1;
4RR2/1r4p1/3k1p2/5K2/5PPP/6r1/8/8 w - - bm g5; id "Petrosian-Larsen, Biel izt 1976"; pm Re6+;
2brr1k1/pp2bppn/1qp4p/3nNP2/2BPNB2/P6P/1P3QP1/3RR1K1 w - - bm Bxh6; id "Bologan-Kasimdzhanov, Pamplona 2002"; pm Rd3;
r4r1k/1bq2pp1/2p1p2p/1pPnP1BQ/4B2P/1p4P1/P4P2/3RR1K1 w - - bm Rxd5; id "Gulko-Saidy, American op Los Angeles 1987"; pm axb3;

[Ovyron]

I do not understand what you mean. If it were black to move, there is no possible pawn push to h3. Do you mean one of the chessmen is the wrong color or something else?

It seems that the engine is searching for d6xe5, a black move.

[jdart]

As I mentioned in another post
r1b1k2r/pp3pp1/2npp2p/4P3/1b1P2q1/2NB1N2/PP1Q1PPP/R3K2R w KQkq - bm h3; id "arasan6.9";

Toga wants to play O-O too, but if I force h3 and have it search for Black it will fail low:

Fen: r1b1k2r/pp3pp1/2npp2p/4P3/1b1P2q1/2NB1N1P/PP1Q1PP1/R3K2R b KQkq - 0 1
Bm: Qh5

no 1 0 -106 22 Bxc3 hxg4 Bxd2+ Kxd2
no 1 0 +45 71 Qxg2
no 2 10 +119 1312 Qxg2 Ke2 dxe5 dxe5
no 3 10 +144 5487 Qxg2 Ke2 O-O
no 4 10 +161 7381 Qxg2 Ke2 dxe5 dxe5 O-O
no 5 30 +78 15550 Qxg2 Ke2 dxe5 Rag1 Bxc3 Rxg2 Bxd2 Kxd2
no 6 70 -57 40296 Qxg2 Ke2 dxe5 Rag1 Nxd4+ Nxd4 Bxc3 bxc3
no 7 190 -92 111890 Qxg2 Ke2 dxe5 Rag1 Qxh1 Rxh1 exd4 Rg1
dxc3 bxc3 Bf8
no 8 290 -38 177385 Qxg2 Ke2 dxe5 Rag1 Qxh1 Rxh1 exd4 Rg1 g5
Bg6 dxc3 bxc3
no 9 450 -53 291536 Qxg2 Ke2 dxe5 Rag1 Qxh1 Rxh1 exd4 Rg1 Rg8
Be4 dxc3 bxc3 Bc5
no 10 870 -52 562403 Qxg2 Ke2 dxe5 Rag1 Qxh1 Rxh1 exd4 Rg1 Rg8
Be4 dxc3 bxc3 Be7 Nd4 Nxd4+ cxd4
no 11 1530 -57 972068 Qxg2 Ke2 dxe5 Rag1 Qxh1 Rxh1 exd4 Rg1 g5
h4 gxh4 Nxh4 Bd7 Be4 dxc3 bxc3 Bc5
no 12 2810 -74 1783366 Qxg2 Ke2 dxe5 Rag1 Qxh1 Rxh1 exd4 Rg1
dxc3 bxc3 Bf8 Be4 f5 Bxc6+ bxc6 Ne5 Ba6+
c4 Rd8
no 13 6970 -54 4361353 Qxg2 Ke2 dxe5 Rag1 Nxd4+ Nxd4 Bxc3 bxc3
Qd5 Nb5 Qc6 Qe3 a6 Na7 Qd5
no 14 65630 -216 40028237 Qxg2 Ke2 Bd7 exd6 e5 Qe3 Nxd4+ Nxd4 Qg5
Ndb5 Qh5+ Ke1 Kf8 a3 Bc6 Rg1 Bxc3+ bxc3
Rd8 Rb1
no 15 101570 -216 61708683 Qxg2 Ke2 Bd7 exd6 e5 Qe3 Nxd4+ Nxd4 Qg5
Ndb5 Qh5+ Kd2 Kf8 a3 Bxb5 axb4 Bxd3 Qxd3
Qh4 Ne4
no 16 283850 -232 171847021 Qxg2 Ke2 Nxd4+ Nxd4 Qg5 Qxg5 hxg5 Ndb5
Kd7 exd6 Bxd6 Nxd6 Kxd6 Rac1 Ke7 Ne4 Bd7
Rc7 Rac8 Rxb7 g4 Rg1 gxh3 Rxg7

This is much better (for White) than the score I get for O-O.

[jdart]

I believe this one is correct but difficult:

Arasan, dual Xeon 3GHz, 1hr/move, top 3 move choices:

"Bologan-Kasimdzhanov, Pamplona 2002" bm Bxh6
result: Bxh6 3600 seconds. score: +1.38 2363480945 nodes. ++ correct
Bxh6 gxh6 Qg3+ Kf8 Nxf7 Kxf7 Qg6+ Kf8 Qxh7 Bf6 Nxf6 Rxe1+ Kf2 Qxb2+ Kxe1 Qxg2 Qx
h6+ Qg7 Nh7+ Kg8 Bxd5+ cxd5 Nf6+ Kf8 Qxg7+
result(2): Rd3 3600 seconds. score: +0.34 2443725685 nodes.
** error
Rd3 Kf8 Rb3 Bh4 Ng3 Qa5 Bd2 Qc7 Bxd5 Rxd5 Qf4 Bd8 Ng6+ fxg6 Bb4+ c5 Rxe8+ Kxe8 Q
e4+ Re5 dxe5
result(3): Qg3 3600 seconds. score: +0.31 2393034546 nodes.
** error
Qg3 Ng5 Bxg5 Bxg5 Nxg5 hxg5 Qf2 Re7 Bxd5 cxd5 Rf1 Qf6 Rc1 Rde8 Rc2 Bd7 Nxd7 Rxd7
Rfc1

202 seconds for Arasan to select Bxh6 on this machine.

[jdart]

This one has been discussed in this forum before, for example:

http://www.talkchess.com/forum/viewtopi ... ight=sterk

I think the test is correct but it is one of the more difficult ones. A modified Alaric solved it in under 15 minutes.

[Dann Corbit]

I do not understand what you mean. If it were black to move, there is no possible pawn push to h3. Do you mean one of the chessmen is the wrong color or something else?

It seems that the engine is searching for d6xe5, a black move.

No. The program's chosen move is short-side castle O-O

[Ovyron]

Ok, sorry, the 00 there confused me.

[Vempele]

Ok, sorry, the 00 there confused me.

Me too.