Black is winning here with multiple moves but the point of the test is that Ra2 is a forced mate in 11.
"arasan7.27" bm Ra2 Rb1+
result: Ra2 20 seconds. score:+Mate11 17335588 nodes. ++ correct
Ra2 Kg1 h2+ Kh1 Kf5 Rd1 Kg4 Re1 Kh3 Rc1 g2#
I am not clear why Rb1+ is listed as an alternative solution - this is not in the original suite I posted and isn't even a possible move.
--Jon
The Arasan 8 unresolved positions:
Moderators: hgm, Dann Corbit, Harvey Williamson
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jdart
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jdart
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Re: The Arasan 8 unresolved positions:
Arasan, dual Xeon 3Ghz, 1 hour/move, triple variation mode:
"arasan5.14" bm g5
result: g5 3600 seconds. score: +1.63 2485514637 nodes. ++ correct
g5 hxg5 hxg5 Nh5 Rh1 Bxa3 Rxh5 Bb2 Rxa5 Bxc3+ Kf1 Bxa5 Bd6 g6 Rh6 Rf5 Qa4 Bc3 Bx
f5 exf5
result(2): Qc2 3600 seconds. score: +0.86 2433264434 nodes.
** error
Qc2 Bxa3 g5 hxg5 hxg5 Ne4 Bxe4 dxe4 Bd6 Bb4 Rxa5 Bxa5 Bxf8 Bxc3+ Qxc3 Nxf8 Rh1 Q
b8 g6
result(3): Qb1 3600 seconds. score: +0.66 2380133530 nodes.
** error
"arasan5.14" bm g5
result: g5 3600 seconds. score: +1.63 2485514637 nodes. ++ correct
g5 hxg5 hxg5 Nh5 Rh1 Bxa3 Rxh5 Bb2 Rxa5 Bxc3+ Kf1 Bxa5 Bd6 g6 Rh6 Rf5 Qa4 Bc3 Bx
f5 exf5
result(2): Qc2 3600 seconds. score: +0.86 2433264434 nodes.
** error
Qc2 Bxa3 g5 hxg5 hxg5 Ne4 Bxe4 dxe4 Bd6 Bb4 Rxa5 Bxa5 Bxf8 Bxc3+ Qxc3 Nxf8 Rh1 Q
b8 g6
result(3): Qb1 3600 seconds. score: +0.66 2380133530 nodes.
** error
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jdart
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Re: The Arasan 8 unresolved positions (arasan6.21)
Actually this is what I get with a deeper search:
"arasan6.21" bm Rc6 h5
result: h5 3600 seconds. score: -0.69 3526865047 nodes. ++correct
h5 c3 Rc6 Nxh5 Re6+ Kd4 Rd6+ Kc5 Rd3 Kc4 Rdxf3 c2 R3f2 Rc3 Rc1 Kb3 Rf5 Kb2 Rxc2+
Rxc2 Rxh5 Kc3
result(2): Rc6 3600 seconds. score: -0.69 3433362516 nodes.
++ correct
Rc6 c3 h5 Nxh5 Re6+ Kd4 Rd6+ Kc5 Rd3 Kc4 Rdxf3 c2 R3f2 Rc3 Rc1 Kb3 Rf5 Kb2 Rxc2+
Rxc2 Rxh5 Kc3
result(3): Rf7 3600 seconds. score: -1.38 3386548827 nodes.
Rf7 c3 Re7+ Kd4 h5 c2 h6 Rb1 Ree1 Rxe1 Rxe1 Kc3 h7 Ng6 Kg1 Kd2 Kf2 b5 axb5 c1=Q Rxc1 Kxc1 Kxf3
So Rf8 isn't even in the top 3. It looks to me though like it should be equivalent to Rf7 and could transpose into the line given for Rf7 above.
"arasan6.21" bm Rc6 h5
result: h5 3600 seconds. score: -0.69 3526865047 nodes. ++correct
h5 c3 Rc6 Nxh5 Re6+ Kd4 Rd6+ Kc5 Rd3 Kc4 Rdxf3 c2 R3f2 Rc3 Rc1 Kb3 Rf5 Kb2 Rxc2+
Rxc2 Rxh5 Kc3
result(2): Rc6 3600 seconds. score: -0.69 3433362516 nodes.
++ correct
Rc6 c3 h5 Nxh5 Re6+ Kd4 Rd6+ Kc5 Rd3 Kc4 Rdxf3 c2 R3f2 Rc3 Rc1 Kb3 Rf5 Kb2 Rxc2+
Rxc2 Rxh5 Kc3
result(3): Rf7 3600 seconds. score: -1.38 3386548827 nodes.
Rf7 c3 Re7+ Kd4 h5 c2 h6 Rb1 Ree1 Rxe1 Rxe1 Kc3 h7 Ng6 Kg1 Kd2 Kf2 b5 axb5 c1=Q Rxc1 Kxc1 Kxf3
So Rf8 isn't even in the top 3. It looks to me though like it should be equivalent to Rf7 and could transpose into the line given for Rf7 above.
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jdart
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Re: The Arasan 8 unresolved positions (arasan7.6)
Arasan, dual Xeon 3Ghz, 1hr/move:
"arasan7.6" bm Bb4
result: Bb4 3600 seconds. score: +2.34 2440069652 nodes. ++ corre
ct
Bb4 Qc1 c4 Nbd4 Bxa5 Be4 Nc3 Bxb7 Nxe2+ Nxe2 Qxb7 Qf4 f5 gxf5 Qd5 Ned4 b4 fxg6 h
xg6
result(2): Bf6 3600 seconds. score: +1.69 2388266118 nodes.
** error
Bf6 Qe1 Qc8 Bc2 Bc3 Qd1 c4 Be4 Nf6 Bxb7 Qxb7 Bd2 Ne4 Qc2 Nxd2 Nfxd2 Be5 Nxc4 bxc
4 Qxc4
result(3): Bh8 3600 seconds. score: +1.75 2403662681 nodes.
** error
c5 didn't make the top 3. Bb4 looks best but not by a realy high margin. So it is possible this is not a very good test.
"arasan7.6" bm Bb4
result: Bb4 3600 seconds. score: +2.34 2440069652 nodes. ++ corre
ct
Bb4 Qc1 c4 Nbd4 Bxa5 Be4 Nc3 Bxb7 Nxe2+ Nxe2 Qxb7 Qf4 f5 gxf5 Qd5 Ned4 b4 fxg6 h
xg6
result(2): Bf6 3600 seconds. score: +1.69 2388266118 nodes.
** error
Bf6 Qe1 Qc8 Bc2 Bc3 Qd1 c4 Be4 Nf6 Bxb7 Qxb7 Bd2 Ne4 Qc2 Nxd2 Nfxd2 Be5 Nxc4 bxc
4 Qxc4
result(3): Bh8 3600 seconds. score: +1.75 2403662681 nodes.
** error
c5 didn't make the top 3. Bb4 looks best but not by a realy high margin. So it is possible this is not a very good test.
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jdart
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Re: The Arasan 8 unresolved positions (Arasan 8.13)
Arasan, dual Xeon 3.0GHz, 1hr/move:
"arasan8.13" bm Rxg2
result: Rxg2 3600 seconds. score: +2.19 2737675193 nodes. ++ correct
Rxg2 Kxg2 Qf3+ Kf1 Qxh3+ Ke2 Qh5+ Kf1 f4 Bxf4 Bxf4 Red1 e3 Ke1 Qh2 Rb2 Bg3 Qf1 R
f5 Qc4+ Rf7 fxg3 Qxb2
result(2): f4 3600 seconds. score: +1.63 2539925242 nodes.
** error
f4 Qa6 Qf5 Qb7 Bd8 Rbd1 Qg5 g3 Qh5 Bxf4 Qxh3+ Ke2 Qh5+ Kd2 Rxd4+ Kc2 Qxc5+ Kb1 a
4 Rxd4 Qxd4
result(3): Bh2 3600 seconds. score: +0.25 2504796092 nodes.
** error
Bh2 Qa6 h6 Qc8+ Kh7 Qe8 Be5 Bxh6 Bxd4 Be3 Bxc5 Bxc5 Rxc5 Qe7 Rc2 Qxa7 Qg5
seems clear enough to me.
"arasan8.13" bm Rxg2
result: Rxg2 3600 seconds. score: +2.19 2737675193 nodes. ++ correct
Rxg2 Kxg2 Qf3+ Kf1 Qxh3+ Ke2 Qh5+ Kf1 f4 Bxf4 Bxf4 Red1 e3 Ke1 Qh2 Rb2 Bg3 Qf1 R
f5 Qc4+ Rf7 fxg3 Qxb2
result(2): f4 3600 seconds. score: +1.63 2539925242 nodes.
** error
f4 Qa6 Qf5 Qb7 Bd8 Rbd1 Qg5 g3 Qh5 Bxf4 Qxh3+ Ke2 Qh5+ Kd2 Rxd4+ Kc2 Qxc5+ Kb1 a
4 Rxd4 Qxd4
result(3): Bh2 3600 seconds. score: +0.25 2504796092 nodes.
** error
Bh2 Qa6 h6 Qc8+ Kh7 Qe8 Be5 Bxh6 Bxd4 Be3 Bxc5 Bxc5 Rxc5 Qe7 Rc2 Qxa7 Qg5
seems clear enough to me.
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jdart
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Re: The Arasan 8 unresolved positions:
This one looks busted and probably should be removed, since several moves are close in score:
Arasan, dual Xeon 3.0GHz, 1hr/move
"arasan8.19" bm f5
result: f5 3600 seconds. score: +1.25 3256518366 nodes. ++ correct
f5 Qxf5 Rf2 Bxf3 Rxf3 Qa5 Qh6 Rxd4 Qg7+ Kd6 Qxd4+ Kc6 Qe4+ Kc7 Rf7+ Kd6 Rxb7 Qc5
+ Kh1 Qf2 Qd3+ Ke5 Qc3+ Kf5
result(2): h3 3600 seconds. score: +1.19 3205425734 nodes.
** error
h3 Rxd4 Qxd4 Bxf3 Qg7+ Kd6 gxf3 Rc8 Qxh7 Rxc4 Qxg6 Qf5 Rd2+ Kc6 Qe8+ Kb6 Qd8+ Ka
6 Qd6+ b6 Qa3+ Qa5 Qe3
result(3): c5 3600 seconds. score: +1.14 3169437328 nodes.
** error
c5 Qa6 Re1 Bxf3 f5 Bd5 fxe6 Qa5 Qg5+ Ke8 Qe5 Qxc5 Qf6 Qe7 Qh8+ Qf8 Qxf8+ Kxf8 e7
+ Kf7 exd8=Q
Arasan, dual Xeon 3.0GHz, 1hr/move
"arasan8.19" bm f5
result: f5 3600 seconds. score: +1.25 3256518366 nodes. ++ correct
f5 Qxf5 Rf2 Bxf3 Rxf3 Qa5 Qh6 Rxd4 Qg7+ Kd6 Qxd4+ Kc6 Qe4+ Kc7 Rf7+ Kd6 Rxb7 Qc5
+ Kh1 Qf2 Qd3+ Ke5 Qc3+ Kf5
result(2): h3 3600 seconds. score: +1.19 3205425734 nodes.
** error
h3 Rxd4 Qxd4 Bxf3 Qg7+ Kd6 gxf3 Rc8 Qxh7 Rxc4 Qxg6 Qf5 Rd2+ Kc6 Qe8+ Kb6 Qd8+ Ka
6 Qd6+ b6 Qa3+ Qa5 Qe3
result(3): c5 3600 seconds. score: +1.14 3169437328 nodes.
** error
c5 Qa6 Re1 Bxf3 f5 Bd5 fxe6 Qa5 Qg5+ Ke8 Qe5 Qxc5 Qf6 Qe7 Qh8+ Qf8 Qxf8+ Kxf8 e7
+ Kf7 exd8=Q
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jdart
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Re: The Arasan 8 unresolved positions:
Arasan does select Nd5 but doesn't give it a particularly high score:
"Bolbochan-Najdorf, ARG-ch m Buenos Aires 1949" bm Nd5
result: Nd5 3600 seconds. score: +0.13 2374630485 nodes. ++ correct
Nd5 exd5 exd5+ Qe5 Qxe5+ Nxe5 Re1 Nfg4 h3 Bc5 hxg4 Bxd4 Re4 Bxf2+ Kxf2 f6 Bd2 a5
a3 a4
result(2): Na4 3600 seconds. score: -0.38 2408280450 nodes.
** error
Na4 Bd6 g3 Rc8 f3 O-O Be3 Qb8 Qf1 Rfd8 Qh3 Kh8 Kh1 h6 Nxe6 fxe6 Qxe6
result(3): e5 3600 seconds. score: -0.63 2456650412 nodes.
** error
e5 Qxe5 Qxe5 Nxe5 Ba4+ Ned7 Nce2 Rc8 Bg5 Nd5 Rdc1 Rxc1+ Rxc1 h6 Bh4 g5 Bg3 Bg7 Bd6
"Bolbochan-Najdorf, ARG-ch m Buenos Aires 1949" bm Nd5
result: Nd5 3600 seconds. score: +0.13 2374630485 nodes. ++ correct
Nd5 exd5 exd5+ Qe5 Qxe5+ Nxe5 Re1 Nfg4 h3 Bc5 hxg4 Bxd4 Re4 Bxf2+ Kxf2 f6 Bd2 a5
a3 a4
result(2): Na4 3600 seconds. score: -0.38 2408280450 nodes.
** error
Na4 Bd6 g3 Rc8 f3 O-O Be3 Qb8 Qf1 Rfd8 Qh3 Kh8 Kh1 h6 Nxe6 fxe6 Qxe6
result(3): e5 3600 seconds. score: -0.63 2456650412 nodes.
** error
e5 Qxe5 Qxe5 Nxe5 Ba4+ Ned7 Nce2 Rc8 Bg5 Nd5 Rdc1 Rxc1+ Rxc1 h6 Bh4 g5 Bg3 Bg7 Bd6
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jdart
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Re: The Arasan 8 unresolved positions:
This is Shredder 10:
no 14 12110 -15 10877897 Na4 Bd6 e5 Bxe5 f4 Bxd4+ Rxd4 O-O Bd2 a5
Rc1 Bc6
no 15 23080 -39 20769869 Na4 Bd6 e5 Bxe5 f4 Bxd4+ Rxd4 O-O Rxb4
Bd5
yes 15 40450 -38 35941092 Nd5
yes 15 47470 -3 42120561 Nd5
yes 15 60390 -3 55936011 Nd5 exd5
yes 16 90700 +22 83213329 Nd5 exd5
yes 16 107420 +22 99097040 Nd5 exd5 exd5+ Qe5 Qxe5+ Nxe5 Re1 Ng4 h3
Bc5 hxg4 Bxd4 Re4 Bxf2+
yes 17 179160 +30 166196844 Nd5 exd5 exd5+ Qe5 Qxe5+ Nxe5 Re1 Ng4 h3
Bc5 hxg4 Bxd4 Re4 Bxf2+ Kxf2 f6 Bf4 O-O
Bxe5 fxe5+ Kg3 a5 d6+ Kh8 Rxe5 a4 Bc4
yes 18 649030 +42 602593793 Nd5 exd5 exd5+ Qe5 Qxe5+ Nxe5 Re1 Ng4 h3
Bc5 hxg4 Bxd4 Re4 Bxf2+ Kxf2 f6 Bf4 O-O
Bxe5 fxe5+ Kg3 h6 Rae1
yes 19 1200340 +33 1135333591 Nd5 exd5 exd5+ Qe5 Qxe5+ Nxe5 Re1 Ng4 h3
Bc5 hxg4 Bxd4 Re4 Bxf2+ Kxf2 f6 Bf4 O-O
Bxe5 fxe5+ Kg3 a5 d6+ Kh8 Rxe5 a4
I may replace this test by one with a clearer advantage.
no 14 12110 -15 10877897 Na4 Bd6 e5 Bxe5 f4 Bxd4+ Rxd4 O-O Bd2 a5
Rc1 Bc6
no 15 23080 -39 20769869 Na4 Bd6 e5 Bxe5 f4 Bxd4+ Rxd4 O-O Rxb4
Bd5
yes 15 40450 -38 35941092 Nd5
yes 15 47470 -3 42120561 Nd5
yes 15 60390 -3 55936011 Nd5 exd5
yes 16 90700 +22 83213329 Nd5 exd5
yes 16 107420 +22 99097040 Nd5 exd5 exd5+ Qe5 Qxe5+ Nxe5 Re1 Ng4 h3
Bc5 hxg4 Bxd4 Re4 Bxf2+
yes 17 179160 +30 166196844 Nd5 exd5 exd5+ Qe5 Qxe5+ Nxe5 Re1 Ng4 h3
Bc5 hxg4 Bxd4 Re4 Bxf2+ Kxf2 f6 Bf4 O-O
Bxe5 fxe5+ Kg3 a5 d6+ Kh8 Rxe5 a4 Bc4
yes 18 649030 +42 602593793 Nd5 exd5 exd5+ Qe5 Qxe5+ Nxe5 Re1 Ng4 h3
Bc5 hxg4 Bxd4 Re4 Bxf2+ Kxf2 f6 Bf4 O-O
Bxe5 fxe5+ Kg3 h6 Rae1
yes 19 1200340 +33 1135333591 Nd5 exd5 exd5+ Qe5 Qxe5+ Nxe5 Re1 Ng4 h3
Bc5 hxg4 Bxd4 Re4 Bxf2+ Kxf2 f6 Bf4 O-O
Bxe5 fxe5+ Kg3 a5 d6+ Kh8 Rxe5 a4
I may replace this test by one with a clearer advantage.
-
utzinger
Re: The Arasan 8 unresolved positions:
This position is no problem for Shredder 10.1 UCI onSteve Maughan wrote:Position 39 Rxd5 is sound
[D]r4r1k/1bq2pp1/2p1p2p/1pPnP1BQ/4B2P/1p4P1/P4P2/3RR1K1 w - -
Once you make the move Rybka sees the variation.
Steve
Intel Core 2 Quad Q6600 2.40 GHz:
12/33 0:01 +1.01 1.Lxh6 f5 2.Lxd5 cxd5 3.Le3+ Kg8 4.axb3 Ta2 5.Dg6 Df7 6.h5 Tfa8 7.Tc1 Lc6 8.Ted1 (1.389.686) 718
12/33 0:02 +1.02++ 1.axb3 (1.719.803) 697
12/33 0:03 +1.37++ 1.axb3 (2.061.878) 684
12/33 0:03 +1.37 1.axb3 Kg8 (2.204.772) 686
13/32 0:04 +1.35 1.axb3 Kg8 2.Lxh6 gxh6 3.Dxh6 f6 4.Lxd5 cxd5 5.exf6 Ta6 6.Dg6+ Kh8 7.g4 e5 8.g5 d4 9.b4 (3.233.069) 681
14/38 0:11 +1.11 1.axb3 Kg8 2.Td4 Ta3 (7.786.744) 655
15/36 0:22 +1.16 1.axb3 Kg8 2.Td4 Ta3 3.Lxh6 f5 4.exf6 Sxf6 5.Dg6 Df7 6.Lc1 Txb3 7.Dxf7+ Kxf7 8.Ld3 Sd5 (15.189.603) 665
16/36 0:40 +1.15 1.axb3 Kg8 2.Td4 Ta3 3.Lxh6 f5 4.exf6 Sxf6 5.Dg6 e5 6.Td3 Sxe4 7.Txe4 Df7 8.Dxf7+ Txf7 9.Ld2 Ta1+ 10.Kg2 (27.226.244) 665
16/46 1:04 +1.16++ 1.Txd5 (42.661.552) 665 SB:1
16/46 1:13 +1.51++ 1.Txd5 (48.990.646) 663 SB:6
16/49 2:23 +2.96 1.Txd5 f5 2.exf6 cxd5 3.fxg7+ Dxg7 4.Lg6 bxa2 5.Lxh6 a1D 6.Lxg7+ Kxg7 7.Dh7+ Kf6 8.Txa1 Txa1+ 9.Kg2 La8 10.Dh6 d4+ 11.c6 Lxc6+ 12.Le4+ Ke7 13.Lxc6 (93.596.829) 651 SB:18
17/46 3:06 +3.21++ 1.Txd5 f5 (120.056.011) 644 SB:20
17/48 3:44 +3.56 1.Txd5 f5 2.exf6 cxd5 3.fxg7+ Dxg7 4.Lg6 bxa2 5.Lxh6 a1D 6.Lxg7+ Kxg7 7.Dh7+ Kf6 8.Txa1 Txa1+ 9.Kg2 d4+ 10.Dxb7 Kxg6 11.De4+ Kh6 12.Dxe6+ Kg7 13.Dd7+ Kg8 14.Dg4+ (145.261.552) 646 SB:29
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jdart
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Re: The Arasan 8 unresolved positions (Shredder-Rybka)
This one is valid but difficult:
"Shredder-Rybka, WCCC 2006" bm Bh6
result: Bh6 3600 seconds. score: +1.39 2511521532 nodes. ++ correct
Bh6 f5 Bxf8 Kxf8 Kh1 Kg8 Qe2 a5 Qd2 Qe7 b3 Qe6 g3 Qg6 Nh4 Qh5
result(2): Qf2 3600 seconds. score: +0.39 2325571123 nodes.
** error
Qf2 c4 Rae1 Bxe3 Qxe3 Re8 Qh6 Re6 Nd4 Rxe5 Rxe5 fxe5 Rxf7 Kxf7 Qxh7+
result(3): Rae1 3600 seconds. score: +0.50 2587701225 nodes.
** error
Rae1 Qe7 Bh6 Re8 Qc1 f5 Qf4 Qe6 Nh4 Kh8 Nxf5 c4+ Kh1 Qxf5 Qxf5 Bxf5 Rxf5 Rbe7
1000 seconds for Arasan to find this on a dual Xeon.
"Shredder-Rybka, WCCC 2006" bm Bh6
result: Bh6 3600 seconds. score: +1.39 2511521532 nodes. ++ correct
Bh6 f5 Bxf8 Kxf8 Kh1 Kg8 Qe2 a5 Qd2 Qe7 b3 Qe6 g3 Qg6 Nh4 Qh5
result(2): Qf2 3600 seconds. score: +0.39 2325571123 nodes.
** error
Qf2 c4 Rae1 Bxe3 Qxe3 Re8 Qh6 Re6 Nd4 Rxe5 Rxe5 fxe5 Rxf7 Kxf7 Qxh7+
result(3): Rae1 3600 seconds. score: +0.50 2587701225 nodes.
** error
Rae1 Qe7 Bh6 Re8 Qc1 f5 Qf4 Qe6 Nh4 Kh8 Nxf5 c4+ Kh1 Qxf5 Qxf5 Bxf5 Rxf5 Rbe7
1000 seconds for Arasan to find this on a dual Xeon.