Shredder Classic takes 27 seconds to find the best move. Try to solve this one in your head first before testing you engine.

Moderators: hgm, Dann Corbit, Harvey Williamson
An old version of Gaviota that I have here in this computer finds it a ply 8, Bf6 at ply 7. Takes longer to find it though!Michael Sherwin wrote:RomiChess (one core) && Glaurung 2.1 (four core) find Nc3xd5 in just over 1 second at a search depth of 14.
What I find interesting is that Fruit 2.1 finds the same move (also in just over one second) at a depth of 9!
Code: Select all
3 1 0.0 -1.00 1.Nxd5 cxd5
6 1 0.0 +0.95 1.f4
10 1 0.0 +1.00 1.f3
14 1 0.0 +1.02 1.a4
20 1 0.0 +1.03 1.h3
66 1 0.0 +1.04 1.Qf4
80 1: 0.0 +1.04 1.Qf4
146 2 0.0 +0.79 1.Qf4 Kg8
379 2: 0.0 +0.79 1.Qf4 Kg8
613 3 0.0 +0.82 1.Qf4 Kg8 2.Bh4
2937 3: 0.0 +0.82 1.Qf4 Kg8 2.Bh4
3626 4 0.0 +0.66 1.Qf4 Kg8 2.Bh4 Be6
11984 4: 0.1 +0.66 1.Qf4 Kg8 2.Bh4 Be6
15554 5 0.1 +0.78 1.Qf4 Kg8 2.Rfe1 Na6 3.Qf3
44546 5: 0.2 +0.78 1.Qf4 Kg8 2.Rfe1 Na6 3.Qf3
63088 6 0.2 +0.64 1.Qf4 Kg8 2.a3 Nd7 3.Rfe1 Nc5
186424 6: 0.6 +0.64 1.Qf4 Kg8 2.a3 Nd7 3.Rfe1 Nc5
274236 7 0.9 +0.62 1.Qf4 h6 2.Bh4 g5 3.Qf6 Kg8 4.Bg3
917469 7 2.9 :-) 1.Bf6
937263 7 3.0 +1.81 1.Bf6 Rg8 2.Nxd5 gxf6 3.Qa3+ c5 4.Qxc5+
Kg7 5.Nxf6
943905 7: 3.0 +1.81 1.Bf6 Rg8 2.Nxd5 gxf6 3.Qa3+ c5 4.Qxc5+
Kg7 5.Nxf6
972293 8 3.1 :-) 1.Bf6
1068841 8 3.3 +2.45 1.Bf6 Rg8 2.Nxd5 gxf6 3.Qa3+ Kg7 4.Nc7
Qxe5 5.Nxa8
1573237 8 4.9 :-) 1.Nxd5
1655795 8 5.1 +3.10 1.Nxd5 cxd5 2.Bf6 gxf6 3.exf6 Qc6
4.Qg7+ Ke8 5.Qxh8+ Kd7 6.Rae1 Kc7
7.Re7+ Bd7 8.Qxh7 Qxf6 9.Qxf7 Qxf7
10.Rxf7
1661843 8: 5.1 +3.10 1.Nxd5 cxd5 2.Bf6 gxf6 3.exf6 Qc6
4.Qg7+ Ke8 5.Qxh8+ Kd7 6.Rae1 Kc7
7.Re7+ Bd7 8.Qxh7 Qxf6 9.Qxf7 Qxf7
10.Rxf7
1882353 9 5.8 +3.10 1.Nxd5 cxd5 2.Bf6 gxf6 3.exf6 Qc6
4.Qg7+ <=TRANS
2185510 9: 6.6 +3.10 1.Nxd5 cxd5 2.Bf6 gxf6 3.exf6 Qc6
4.Qg7+ <=TRANS
3071317 10 9.3 +3.34 1.Nxd5 cxd5 2.Bf6 gxf6 3.exf6 Qc6
4.Qg7+ Ke8 5.Qxh8+ Kd7 6.Qg7 Qxc2
7.Qxf7+ Kc6 8.Rad1 Qxb2 9.Qxd5+ Kc7
3696518 10: 10.9 +3.34 1.Nxd5 cxd5 2.Bf6 gxf6 3.exf6 Qc6
4.Qg7+ Ke8 5.Qxh8+ Kd7 6.Qg7 Qxc2
7.Qxf7+ Kc6 8.Rad1 Qxb2 9.Qxd5+ Kc7
5736664 11 17.1 +3.28 1.Nxd5 cxd5 2.Bf6 gxf6 3.exf6 Qc6
4.Qg7+ Ke8 5.Qxh8+ Kd7 6.Qg7 Kc7
7.Qxf7+ Bd7 8.Qxh7 Qxf6
13289556 11: 38.1 +3.28 1.Nxd5 cxd5 2.Bf6 gxf6 3.exf6 Qc6
4.Qg7+ Ke8 5.Qxh8+ Kd7 6.Qg7 Kc7
7.Qxf7+ Bd7 8.Qxh7 Qxf6
19809532 12 56.9 +3.28 1.Nxd5 cxd5 2.Bf6 g6 3.Bxh8 Kg8 4.Bf6
Nd7 5.Bg5 Qxe5 6.Qxe5 Nxe5 7.Rfe1
Code: Select all
00:00:00.1 -1,10 1 7 Nxd5 cxd5
00:00:00.1 -1,03 1 15 Bf6 gxf6 exf6
00:00:00.1 0,52 1 17 Rae1
00:00:00.1 0,68 1 19 Rad1
00:00:00.1 0,25 2 159 Rad1 Nd7
00:00:00.1 0,50 2 266 f4 Nd7
00:00:00.1 0,45 3 909 f4 Bf5 Rac1
00:00:00.2 0,51 3 2039 Ne2 Nd7 f4
00:00:00.2 0,41 4 4269 Ne2 Nd7 f4 c5
00:00:00.2 0,41 4 15423 e6
00:00:00.2 0,87 4 16190 e6 Qxe6 Rae1
00:00:00.2 0,87 4 17011 Bf6
00:00:00.2 1,29 4 17563 Bf6 Rg8 Nxd5 gxf6 Qxg8+ Kxg8 Nxf6+ Kf8 Nxe8 Kxe8
00:00:00.2 1,29 5 20550 Bf6 Rg8 Nxd5 gxf6 Qxg8+ Kxg8 Nxf6+ Kf8 Nxe8 Kxe8
00:00:00.2 1,29 6 34290 Bf6 Rg8 Nxd5 gxf6 Qxg8+ Kxg8 Nxf6+ Kf8 Nxe8 Kxe8
00:00:00.2 1,29 7 66483 Bf6 Rg8 Nxd5 gxf6 Qxg8+ Kxg8 Nxf6+ Kf8 Nxe8 Kxe8
00:00:00.3 1,51 8 151492 Bf6 Rg8 Nxd5 gxf6 Qxg8+ Kxg8 Nxf6+ Kf8 Nxe8 Kxe8 f4 Nd7
00:00:00.4 1,51 8 220722 Nxd5
00:00:00.5 1,91 8 327151 Nxd5 cxd5 Bf6 gxf6 exf6 Qd8 Qg7+ Ke8 Qxh8+ Kd7 Qxd8+ Kxd8 Rae1
00:00:00.7 2,05 9 601044 Nxd5 cxd5 Bf6 gxf6 exf6 Qd8 Qg7+ Ke8 Qxh8+ Kd7 Qg7 Kc7 Qxf7+ Nd7 Rae1
00:00:01.5 2,05 10 1730384 Nxd5 cxd5 Bf6 gxf6 exf6 Qd8 Qg7+ Ke8 Qxh8+ Kd7 Qg7 Kc7 Qxf7+ Nd7 Rae1
00:00:05.3 2,32 11 6646746 Nxd5 cxd5 Bf6 gxf6 exf6 Qd8 Qg7+ Ke8 Qxh8+ Kd7 Qg7 Kd6 Qxf7 Nd7 Rae1 Kc7 Qxh7 Qxf6
00:00:12.7 2,32 12 16418905 Nxd5 cxd5 Bf6 gxf6 exf6 Qd8 Qg7+ Ke8 Qxh8+ Kd7 Qg7 Kd6 Qxf7 Nd7 Rae1 Kc7 Qxh7 Qxf6
00:00:40.2 2,34 13 53220164 Nxd5 cxd5 Bf6 g6 Qe3 Kg8 Qh6 Qf8 Qxf8+ Kxf8 Bxh8 Nc6 Rfd1 Kg8