Which engines allow Black knight sac for three pawns here?

[zullil]

Please note that my reply was to Graham's original post (use thread view), in which he asked which engines play a move for White that allows Black to respond with the knight sacrifice.

This thread is getting more and more confused.

[zullil]

Here's the latest Stockfish (8 threads, 4 GB hash, MultiPV=3) at depth 30. The search will continue to depth 35.

Code: Select all

info depth 30 seldepth 44 score cp 1 nodes 2429501351 nps 7262041 time 334548 multipv 1 pv e5d6 e8g8 e1g1 e7d6 d4c5 d7c5 a1b1 d8c8 c3d5 f8e8 f4f5 c5e4 f5g6 h7g6 c1e3 h5f6 d5f6 g7f6 f3d2 e4g5 e3g5 c8c5 g1h1 f6g5 c2c3 c5c6 d2b3 a7a6 b3d4 c6d5 d1f3 d5f3

info depth 30 seldepth 44 score cp -22 nodes 2429501351 nps 7262041 time 334548 multipv 2 pv c1e3 h5f4 e3f4 c5d4 e5e6 f7e6 f3d4 g7d4 d1d4 e6e5 f4e5 d7e5 e1c1 e8g8 d4d5 f8f7 d5b7 d8c8 b7d5 g8h8 c1b1 a8b8 d5d4 h8g8 h1e1 a7a6 b2b3 c8c6 d4d2 b8c8 c3e4 c8f8 h2h4

info depth 30 seldepth 44 score cp -33 nodes 2429501351 nps 7262041 time 334548 multipv 3 pv c3e2 c5d4 e5d6 e7e5 e1g1 e8g8 f4e5 d7e5 e2d4 d8d6 c2c3 f8e8 c1g5 h7h6 g5d2 e5c4 d1c1 c4d2 c1d2 h5f6 a1e1 a8d8 e1e8 d8e8 f1e1 e8e1 d2e1 d6d5 b2b3 f6e4 e1e3 f7f5 g2g3 h6h5

Depth 31:

Code: Select all

info depth 31 seldepth 48 score cp 0 nodes 3991788325 nps 7489775 time 532965 multipv 1 pv c1e3 h5f4 e3f4 c5d4 e5e6 f7e6 f3d4 g7d4 d1d4 e6e5 f4e5 d7e5 e1c1 e8g8 d4d5 g8h8 d5b7 a7a5 h1f1 a8b8 b7a7 f8f1 d1f1 e5c6 a7a6 c6d4 a6a7 d4c6

info depth 31 seldepth 48 score cp -8 nodes 3991788325 nps 7489775 time 532965 multipv 2 pv e5d6 e8g8 e1g1 e7d6 a2a4 d8a5 f4f5 a7a6 g2g4 c5d4 c3e2 h5f6 g4g5 f6e4 f5f6 g7h8 d1d4 f8e8 e2g3 a5c5 d4c5 d7c5 c1f4 h7h6 g3e4 e8e4 f4d6 a8c8 h2h4 c5a4 b2b3 a4c3

info depth 31 seldepth 48 score cp -28 nodes 3991788325 nps 7489775 time 532965 multipv 3 pv c3e2 c5d4 e5d6 e7e5 e1g1 e8g8 f4e5 d7e5 e2d4 d8d6 c2c3 f8e8 c1g5 h7h6 g5d2 e5c4 d1c1 g6g5 d4f5 d6d3 f5g7 h5g7 b2b3 c4d2 c1d2 d3d2 f3d2 a8d8 a1d1 e8e2 d2c4 d8d1 f1d1 e2a2 d1d7 a2c2 d7b7 c2c3

Depth 32:

Code: Select all

info depth 32 seldepth 52 score cp 0 nodes 8496829540 nps 7797996 time 1089617 multipv 1 pv e5d6 e8g8 e1g1 e7d6 a2a4 f8e8 a4a5 f7f5 d1d3 c5d4 d3c4 g8h8 f3g5 d8e7 g5f7 h8g8 f7h6 g8h8 h6f7

info depth 32 seldepth 52 score cp -18 nodes 8496829540 nps 7797996 time 1089617 multipv 2 pv c1e3 h5f4 e3f4 c5d4 e5e6 f7e6 f3d4 g7d4 d1d4 e6e5 f4e5 d7e5 e1c1 e8g8 d4d5 f8f7 d5b7 d8c8 b7d5 g8g7 h1e1 a8b8 d5d4 c8c4 d4c4 e5c4 b2b3 c4e5 c3e4 b8c8 c2c4 f7f8 c1b2 f8f5 b2c2 f5f8 h2h3 f8f5 e1f1 h7h6

info depth 32 seldepth 52 score cp -45 nodes 8496829540 nps 7797996 time 1089617 multipv 3 pv c3e2 c5d4 e5d6 e7e5 f4e5 d7e5 e2d4 e8g8 e1g1 d8d6 c2c3 a8e8 f3e5 g7e5 d4f3 d6c5 g1h1

Depth 33:

Code: Select all

info depth 33 seldepth 52 score cp 0 nodes 9630797279 nps 7833291 time 1229470 multipv 1 pv e5d6 e8g8 e1g1 e7d6 a2a4 f8e8 a4a5 f7f5 d1d3 c5d4 d3c4 g8h8 f3g5 d8e7 g5f7 h8g8 f7h6 g8h8 h6f7

info depth 33 seldepth 52 score cp -18 nodes 9630797279 nps 7833291 time 1229470 multipv 2 pv c1e3 h5f4 e3f4 c5d4 e5e6 f7e6 f3d4 g7d4 d1d4 e6e5 f4e5 d7e5 e1c1 e8g8 d4d5 f8f7 d5b7 d8c8 b7d5 g8g7 h1e1 a8b8 d5d4 c8c4 d4c4 e5c4 b2b3 c4e5 c3e4 b8c8 c2c4 f7f8 c1b2 f8f5 b2c2 f5f8 h2h3 f8f5

info depth 33 seldepth 52 score cp -44 nodes 9630797279 nps 7833291 time 1229470 multipv 3 pv c3e2 c5d4 e5d6 e7e5 f4e5 d7e5 e2d4 e8g8 e1g1 d8d6 c2c3 a8e8 f3e5 g7e5 d4f3 d6c5 g1h1 e5g7 c1g5 h5f6 g5f6 g7f6 d1b3 e8e7 a1d1 f8e8 f3d4 f6e5 d4f3 e5f4 b3a4 f4e3 f3d4

[zullil]

You are not allowed to edit your post. You have to edit your post within 15 minutes, after you posted your message.

Depth 34:

Code: Select all

info depth 34 seldepth 52 score cp 0 nodes 14677111907 nps 7911737 time 1855106 multipv 1 pv e5d6 e8g8 e1g1 e7d6 a2a4 f8e8 a4a5 f7f5 d1d3 c5d4 d3c4 g8h8 f3g5 d8e7 g5f7 h8g8 f7h6 g8h8 h6f7

info depth 34 seldepth 52 score cp -18 nodes 14677111907 nps 7911737 time 1855106 multipv 2 pv c1e3 h5f4 e3f4 c5d4 e5e6 f7e6 f3d4 g7d4 d1d4 e6e5 f4e5 d7e5 e1c1 e8g8 d4d5 f8f7 d5b7 d8c8 b7d5 g8g7 h1e1 a8b8 d5d4 c8c4 d4c4 e5c4 b2b3 c4e5 c3e4 b8c8 c2c4 f7f8 c1b2 f8f5 b2c2 f5f8 h2h3 f8f5

info depth 34 seldepth 52 score cp -50 nodes 14677111907 nps 7911737 time 1855106 multipv 3 pv e5e6 f7e6 f3g5 g7d4 g5e6 d4c3 b2c3 d8c8 e1g1 d7f8 e6f8 h8f8 f4f5 f8f5 f1f5 c8f5 g2g4 f5e4 g4h5 g6h5 d1d3 e4e1 d3f1 e1c3 a1b1 b7b6 f1f5 c3d4 g1g2 d4g4 f5g4 h5g4 g2g3 h7h5 c1g5 e8d7 b1f1 e7e5 g3h4

[Eelco de Groot]

You are not allowed to edit your post. You have to edit your post within 15 minutes, after you posted your message.

Depth 34:

Code: Select all

info depth 34 seldepth 52 score cp 0 nodes 14677111907 nps 7911737 time 1855106 multipv 1 pv e5d6 e8g8 e1g1 e7d6 a2a4 f8e8 a4a5 f7f5 d1d3 c5d4 d3c4 g8h8 f3g5 d8e7 g5f7 h8g8 f7h6 g8h8 h6f7

info depth 34 seldepth 52 score cp -18 nodes 14677111907 nps 7911737 time 1855106 multipv 2 pv c1e3 h5f4 e3f4 c5d4 e5e6 f7e6 f3d4 g7d4 d1d4 e6e5 f4e5 d7e5 e1c1 e8g8 d4d5 f8f7 d5b7 d8c8 b7d5 g8g7 h1e1 a8b8 d5d4 c8c4 d4c4 e5c4 b2b3 c4e5 c3e4 b8c8 c2c4 f7f8 c1b2 f8f5 b2c2 f5f8 h2h3 f8f5

info depth 34 seldepth 52 score cp -50 nodes 14677111907 nps 7911737 time 1855106 multipv 3 pv e5e6 f7e6 f3g5 g7d4 g5e6 d4c3 b2c3 d8c8 e1g1 d7f8 e6f8 h8f8 f4f5 f8f5 f1f5 c8f5 g2g4 f5e4 g4h5 g6h5 d1d3 e4e1 d3f1 e1c3 a1b1 b7b6 f1f5 c3d4 g1g2 d4g4 f5g4 h5g4 g2g3 h7h5 c1g5 e8d7 b1f1 e7e5 g3h4

I think you already edited your post once That does not reset the clock, so the trick can only be used once... Also, be sure to be logged in when you try submit your post otherwise you get no access and you probably can't go back to the previous page either, so if you had not copied the text before submitting, everything you typed will be lost. That happened to me once in the past, after an hour or so trying to perfect a brilliant essay of a post

By the way I did not seem to get Be3 on top at all, in a short search, four best moves:

r2qk2r/pp1nppbp/3p2p1/2p1P2n/3P1P2/2N2N2/PPP3PP/R1BQK2R w KQkq -

Engine: Sf20140119_008 MP (Q6700, 4 threads, 512 MB)
(Testversion with only slight pawns.cpp change that is not likely to influence
the result here)
by Tord Romstad, Marco Costalba and Joona Kiiski

26 3:34 0.00 1.e6 fxe6 2.Ng5 Bxd4 3.Nxe6 Bxc3+
4.bxc3 Qb6 5.f5 Qc6 6.O-O Ne5 7.Qe2 Rg8
8.Bg5 Nf6 9.fxg6 Rxg6 10.Rad1 Kf7
11.Bxf6 Rxf6 12.Qh5+ Kxe6 13.Qh3+ Kf7
14.Qxh7+ (518.839.335) 2424

26 3:34 -0.04 1.exd6 O-O 2.O-O exd6 3.a4 Re8 4.f5 cxd4
5.Nb5 Ne5 6.Nbxd4 Qb6 7.fxg6 hxg6
8.c3 Rac8 9.Ra3 Rc7 10.Nxe5 dxe5
11.Rb3 Qc5 12.Rb5 Qd6 (518.839.335) 2424

26 3:34 -0.26 1.Be3 Nxf4 2.Bxf4 cxd4 3.e6 fxe6
4.Ne2 e5 5.Bg3 Qa5+ 6.c3 dxc3 7.Nxc3 e4
8.Nd2 Bxc3 9.bxc3 e3 10.Ne4 O-O
11.Qd4 e2 12.Qd2 Rac8 13.Rc1 Nf6
14.Nf2 (518.839.335) 2424

26 3:34 -0.35 1.Ne2 cxd4 2.exd6 e5 3.O-O O-O
4.fxe5 Nxe5 5.Nexd4 Qxd6 6.c3 Rfe8
7.Qb3 Nxf3+ 8.Nxf3 Qc5+ 9.Kh1 Nf6
10.Nd4 Re7 11.Bf4 Rae8 12.Rad1 Ne4
13.Rf3 Qh5 14.Rdf1 (518.839.335) 2424

__________________________________________________________

27 7:48 0.00 1.exd6 O-O 2.O-O exd6 3.a4 Re8 4.a5 Qc8
5.f5 gxf5 6.Ra4 Ndf6 7.Nh4 f4 8.dxc5 Qxc5+
9.Kh1 Bh6 10.g4 Qc6+ 11.Kg1 Qc5+
12.Kh1 Qc6+ (1.154.312.811) 2464

27 7:48 -0.09 1.e6 fxe6 2.Ng5 Bxd4 3.Nxe6 Bxc3+
4.bxc3 Qb6 5.f5 Nf8 6.O-O Nxe6
7.fxe6 Nf6 8.Bh6 Rg8 9.Rb1 Qc6
10.Qd3 O-O-O 11.Bg5 Rdf8 12.c4 Qa6
13.Bxf6 Rxf6 14.Rxf6 (1.154.312.811) 2464

27 7:48 -0.34 1.Be3 Nxf4 2.Bxf4 cxd4 3.e6 fxe6
4.Ne2 e5 5.Bg5 Qb6 6.c3 Rf8 7.Qc2 Rc8
8.O-O-O Rf7 9.Rhe1 Nc5 10.Kb1 d3
11.Rxd3 e4 12.Re3 exf3 13.Nd4 e5
14.Rxf3 (1.154.312.811) 2464

27 7:48 -0.35 1.Ne2 cxd4 2.exd6 e5 3.O-O O-O
4.fxe5 Nxe5 5.Nexd4 Qxd6 6.c3 Rfe8
7.Qb3 Nxf3+ 8.Nxf3 Qc5+ 9.Kh1 Nf6
10.Nd4 Re7 11.Bf4 Rae8 12.Rad1 Ne4
13.Rf3 Qh5 14.Rdf1 (1.154.312.811) 2464

__________________________________________________________

28 9:11 0.00 1.exd6 O-O 2.O-O exd6 3.a4 Re8 4.a5 Qc8
5.f5 gxf5 6.Ra4 Ndf6 7.Nh4 f4 8.dxc5 Qxc5+
9.Kh1 Bh6 10.g4 Qc6+ 11.Kg1 Qc5+
12.Kh1 Qc6+ (1.355.625.108) 2460

28 9:11 0.00 1.e6 fxe6 2.Ng5 Bxd4 3.Nxe6 Bxc3+
4.bxc3 Qb6 5.f5 Nf8 6.O-O Nxe6
7.fxe6 Nf6 8.Bh6 Rg8 9.Rb1 Qc6
10.Qd3 O-O-O 11.Bg5 Rdf8 12.c4 Qa6
13.Qb3 Kb8 14.Bxf6 (1.355.625.108) 2460

28 9:11 -0.29 1.Be3 Nxf4 2.Bxf4 cxd4 3.e6 fxe6
4.Ne2 e5 5.Bg5 O-O 6.c3 Nc5 7.O-O d3
8.Ng3 e4 9.b4 exf3 10.bxc5 dxc5
11.Qb3+ Kh8 12.Ne4 c4 13.Qxc4 Qb6+
14.Rf2 (1.355.625.108) 2460

28 9:11 -0.35 1.Ne2 cxd4 2.exd6 e5 3.O-O O-O
4.fxe5 Nxe5 5.Nexd4 Qxd6 6.c3 Rfe8
7.Qb3 Nxf3+ 8.Nxf3 Qc5+ 9.Kh1 Nf6
10.Nd4 Re7 11.Bf4 Rae8 12.Rad1 Ne4
13.Rf3 Qh5 14.Rdf1 (1.355.625.108) 2460

__________________________________________________________

29 11:53 0.00 1.exd6 O-O 2.O-O exd6 3.a4 Re8 4.a5 Qc8
5.f5 Qc6 6.d5 Qa6 7.Bd2 Nhf6 8.fxg6 hxg6
9.Kh1 Re7 10.Bg5 Ree8 11.Bd2 (1.754.289.252) 2459

29 11:53 -0.06 1.e6 fxe6 2.Ng5 Bxd4 3.Nxe6 Bxc3+
4.bxc3 Qb6 5.f5 Nf8 6.O-O Nxe6
7.fxe6 Nf6 8.Bh6 Rg8 9.Rb1 Qc6
10.Qd3 O-O-O 11.Bg5 Rdf8 12.c4 Qa6
13.Bxf6 Rxf6 14.Rxf6 (1.754.289.252) 2459

29 11:53 -0.22 1.Be3 Nxf4 2.Bxf4 cxd4 3.e6 fxe6
4.Nxd4 Bxd4 5.Qxd4 e5 6.Bxe5 Nxe5
7.O-O-O O-O 8.Qd5+ Rf7 9.Qxb7 Qc8
10.Qd5 Qc6 11.Qxc6 Nxc6 12.Ne4 Raf8
13.Rhe1 Ne5 14.b3 (1.754.289.252) 2459

29 11:53 -0.25 1.Ne2 cxd4 2.exd6 e5 3.O-O O-O
4.fxe5 Nxe5 5.Nexd4 Qxd6 6.c3 Rfe8
7.Bg5 h6 8.Bd2 a6 9.Qb3 Nd3 10.Rad1 Rad8
11.Qc2 Nhf4 12.Bxf4 Nxf4 13.Rfe1 Nd5
14.Qd2 (1.754.289.252) 2459

[zullil]

Depth 35:

Code: Select all

info depth 35 seldepth 54 score cp 0 nodes 22215290152 nps 7998108 time 2777568 multipv 1 pv e5d6 e8g8 e1g1 e7d6 a2a4 f8e8 a4a5 f7f5 d1d3 c5d4 d3c4 g8h8 f3g5 d8e7 g5f7 h8g8 f7h6 g8h8 h6f7

info depth 35 seldepth 54 score cp -14 nodes 22215290152 nps 7998108 time 2777568 multipv 2 pv c1e3 h5f4 e3f4 c5d4 e5e6 f7e6 f3d4 g7d4 d1d4 e6e5 f4e5 d7e5 e1c1 e8g8 d4d5 f8f7 d5b7 d8c8 b7d5 g8g7 h1e1 a8b8 d5d4 c8g4 d4g4 e5g4 h2h3 g4e5 b2b3 b8c8 c3e4 f7f4 d1d4 f4f8 c1b2 a7a6 d4d1 f8f5 c2c4

info depth 35 seldepth 54 score cp -47 nodes 22215290152 nps 7998108 time 2777568 multipv 3 pv c3e2 c5d4 e5d6 e7e5 f4e5 d7e5 e2d4 e5f3 d4f3 e8g8 e1g1 d8b6 g1h1 f8d8 d6d7 h5f6 c2c3 d8d7 d1b3 b6b3 a2b3 f6e4 c1e3 a7a6 e3d4 a8e8 h1g1 f7f5 b3b4 g8f7 d4g7 f7g7 f3d4 d7e7
info nodes 22215290152 time 2777568
bestmove e5d6 ponder e8g8

So it appears that Stockfish avoids Be3 and prefers exd6.