How many engines can solve this puzzle white to move

[pichy]

[D]1nb3rr/2pp3p/p1k2P2/n1q1PN2/P1pR3N/b4PBp/1R2P3/1KQ5 w - - 1 1

[sje]

On White's first move, the half move counter must be zero. Therefore, the FEN is invalid.

[zullil]

[D]1nb3rr/2pp3p/p1k2P2/n1q1PN2/P1pR3N/b4PBp/1R2P3/1KQ5 w - - 1 1

Critter-1.4 (8 threads, 4GB hash) finds Rd6+ in about ten minutes:

Code: Select all

23/65+ 09:41 5964200783 10255115  +0.96 Rd6+ cxd6 Ne7+ Kc7 exd6+ Kd8 Nxg8 Bxb2 f7 Bg7 Qc3 Qb6+ Kc1 Nb3+ Kd1 Qg1+ Be1 Qg5 Qxc4 Nc6 Qxb3 Nb4 Nf5 Bb7 Qxb4 Qxf5 Qh4+ Kc8 Ne7+
23/72+ 12:09 7405363522 10153429  +1.25 Rd6+ cxd6 Ne7+ Kc7 exd6+ Kd8 Nxg8 Bxb2 f7 Bg7 Qc3 Qb6+ Kc1 Nb3+ Kd1 Qg1+ Be1 Qg5 Qxc4 Nc6 Qxb3 Nb4 Nf5 Bb7 Qxb4 Qxf5 Qh4+ Kc8 Ne7+
23/79+ 15:37 9466148738 10099110  +1.67 Rd6+ cxd6 Ne7+ Kc7 exd6+ Kd8 Nxg8 Bxb2 f7 Bg7 Qc3 Qb6+ Kc1 Nb3+ Kd1 Qg1+ Be1 Qg5 Qxc4 Nc6 Qxb3 Nb4 Nf5 Bb7 Qxb4 Kc8 Qc5+ Kb8 Qc7+ Ka7 Nxg7 Qxg7 Qxd7
23/83+ 21:12 12879231245 10119684  +2.31 Rd6+ cxd6 Ne7+ Kc7 exd6+ Kd8 Nxg8 Bxb2 f7 Bg7 Qc3 Qb6+ Kc1 Nb3+ Kd1 Qg1+ Be1 Qg5 Qxc4 Nc6 Qxb3 Nb4 Nf5 Bb7 Qxb4 Kc8 Qc4+ Kb8 Qc7+ Ka7 Nxg7 Qd5+ Kc2 Rxg8 fxg8=Q Qxg8 Bf2+ Ka8 Qb6 Qa2+ Kc3 Qa1+ Kd2 Qa2+ Ke3 Qxa4 Bg1

[zullil]

More from Critter:

Code: Select all

23/91  60:05 37412802432 10376168  +5.58 Rd6+ cxd6 Ne7+ Kc7 exd6+ Qxd6 Bxd6+ Bxd6 Nxg8 Nbc6 f7 c3 Qxc3 h2 Qc1 Nc4 Nf5 Bf8 Ng3 N4e5 Qf4 a5 Nf6 Kd8 Nd5 Be7 Nxe7 Kxe7 Nf5+ Ke6 Qh6+ Kxf7 Qxh2 Ng6 Qc7 Nge7 Nxe7 Nxe7 Rb5 Rg8 Rh5 Rg1+ Kb2 Rg2 Rxh7+ Ke6 Kb3

[pichy]

[D]1nb3rr/2pp3p/p1k2P2/n1q1PN2/P1pR3N/b4PBp/1R2P3/1KQ5 w - - 1 1

Critter-1.4 (8 threads, 4GB hash) finds Rd6+ in about ten minutes:

Code: Select all

23/65+ 09:41 5964200783 10255115  +0.96 Rd6+ cxd6 Ne7+ Kc7 exd6+ Kd8 Nxg8 Bxb2 f7 Bg7 Qc3 Qb6+ Kc1 Nb3+ Kd1 Qg1+ Be1 Qg5 Qxc4 Nc6 Qxb3 Nb4 Nf5 Bb7 Qxb4 Qxf5 Qh4+ Kc8 Ne7+
23/72+ 12:09 7405363522 10153429  +1.25 Rd6+ cxd6 Ne7+ Kc7 exd6+ Kd8 Nxg8 Bxb2 f7 Bg7 Qc3 Qb6+ Kc1 Nb3+ Kd1 Qg1+ Be1 Qg5 Qxc4 Nc6 Qxb3 Nb4 Nf5 Bb7 Qxb4 Qxf5 Qh4+ Kc8 Ne7+
23/79+ 15:37 9466148738 10099110  +1.67 Rd6+ cxd6 Ne7+ Kc7 exd6+ Kd8 Nxg8 Bxb2 f7 Bg7 Qc3 Qb6+ Kc1 Nb3+ Kd1 Qg1+ Be1 Qg5 Qxc4 Nc6 Qxb3 Nb4 Nf5 Bb7 Qxb4 Kc8 Qc5+ Kb8 Qc7+ Ka7 Nxg7 Qxg7 Qxd7
23/83+ 21:12 12879231245 10119684  +2.31 Rd6+ cxd6 Ne7+ Kc7 exd6+ Kd8 Nxg8 Bxb2 f7 Bg7 Qc3 Qb6+ Kc1 Nb3+ Kd1 Qg1+ Be1 Qg5 Qxc4 Nc6 Qxb3 Nb4 Nf5 Bb7 Qxb4 Kc8 Qc4+ Kb8 Qc7+ Ka7 Nxg7 Qd5+ Kc2 Rxg8 fxg8=Q Qxg8 Bf2+ Ka8 Qb6 Qa2+ Kc3 Qa1+ Kd2 Qa2+ Ke3 Qxa4 Bg1

What Hardware are you using, it must be very fast to solve this puzzle in such a short time

[pichy]

[D]1nb3rr/2pp3p/p1k2P2/n1q1PN2/P1pR3N/b4PBp/1R2P3/1KQ5 w - - 1 1

Critter-1.4 (8 threads, 4GB hash) finds Rd6+ in about ten minutes:

Code: Select all

23/65+ 09:41 5964200783 10255115  +0.96 Rd6+ cxd6 Ne7+ Kc7 exd6+ Kd8 Nxg8 Bxb2 f7 Bg7 Qc3 Qb6+ Kc1 Nb3+ Kd1 Qg1+ Be1 Qg5 Qxc4 Nc6 Qxb3 Nb4 Nf5 Bb7 Qxb4 Qxf5 Qh4+ Kc8 Ne7+
23/72+ 12:09 7405363522 10153429  +1.25 Rd6+ cxd6 Ne7+ Kc7 exd6+ Kd8 Nxg8 Bxb2 f7 Bg7 Qc3 Qb6+ Kc1 Nb3+ Kd1 Qg1+ Be1 Qg5 Qxc4 Nc6 Qxb3 Nb4 Nf5 Bb7 Qxb4 Qxf5 Qh4+ Kc8 Ne7+
23/79+ 15:37 9466148738 10099110  +1.67 Rd6+ cxd6 Ne7+ Kc7 exd6+ Kd8 Nxg8 Bxb2 f7 Bg7 Qc3 Qb6+ Kc1 Nb3+ Kd1 Qg1+ Be1 Qg5 Qxc4 Nc6 Qxb3 Nb4 Nf5 Bb7 Qxb4 Kc8 Qc5+ Kb8 Qc7+ Ka7 Nxg7 Qxg7 Qxd7
23/83+ 21:12 12879231245 10119684  +2.31 Rd6+ cxd6 Ne7+ Kc7 exd6+ Kd8 Nxg8 Bxb2 f7 Bg7 Qc3 Qb6+ Kc1 Nb3+ Kd1 Qg1+ Be1 Qg5 Qxc4 Nc6 Qxb3 Nb4 Nf5 Bb7 Qxb4 Kc8 Qc4+ Kb8 Qc7+ Ka7 Nxg7 Qd5+ Kc2 Rxg8 fxg8=Q Qxg8 Bf2+ Ka8 Qb6 Qa2+ Kc3 Qa1+ Kd2 Qa2+ Ke3 Qxa4 Bg1

What about this puzzle White to move and win
[D]4N1k1/4q1P1/3pn1pp/Pp2Q3/4B1P1/4Pp1K/8/6b1 w - - 0 1

[zullil]

What about this puzzle White to move and win
[D]4N1k1/4q1P1/3pn1pp/Pp2Q3/4B1P1/4Pp1K/8/6b1 w - - 0 1

Much easier:

Code: Select all

Critter v1.4 64-bit SSE4, by Richard Vida
setoption name Hash value 4096
setboard 4N1k1/4q1P1/3pn1pp/Pp2Q3/4B1P1/4Pp1K/8/6b1 w - - 0 1
info string Opening book: "book.cbk" - 57853 entries [native]
info string GTB Init OK (5 piece set)
info string Using 8 thread(s), 4096 MB hash
go infinite
 2/ 4  00:00       542   18689  -1.11 Nf6+ Kxg7 Ne8+ Kg8 Nxd6
 3/ 5  00:00      1239   38718  -1.11 Nf6+ Kxg7 Ne8+ Kg8 Nxd6
 4/ 7  00:00      2168   61942  -1.82 Nf6+ Kxg7 Ne8+ Kg8 Nf6+ Kf8
 5/10  00:00      5749  117326  -2.55 Nf6+ Kxg7 Ne8+ Kg8 Nf6+ Kf7 Bxg6+ Kxg6 Qf5+ Kg7 Nh5+ Kg8 Qxf3
 6/10  00:00      6443  126333  -2.55 Nf6+ Kxg7 Ne8+ Kg8 Nf6+ Kf7 Bxg6+ Kxg6 Qf5+ Kg7 Nh5+ Kg8 Qxf3
 7/12  00:00      7338  141115  -2.55 Nf6+ Kxg7 Ne8+ Kg8 Nf6+ Kf7 Bxg6+ Kxg6 Qf5+ Kg7 Nh5+ Kg8 Qxf3
 8/14- 00:00      9692  167103  -2.70 Nf6+ Kxg7 Ne8+ Kg8 Nf6+ Kf7 Bxg6+ Kxg6 Qf5+ Kg7 Nh5+ Kg8 Qxf3
 8/14- 00:00     12864  189176  -2.86 Nf6+ Kxg7 Ne8+ Kg8 Nf6+ Kf7 Bxg6+ Kxg6 Qf5+ Kg7 Nh5+ Kg8 Qxf3
 8/14  00:00     13937  196295  -2.98 Nf6+ Kxg7 Ne8+ Kg8 Nf6+ Kf7 Bxg6+ Kxg6 Qf5+ Kg7 Nh5+ Kg8 Nf6+ Kh8 Kg3
 9/26+ 00:00     39837  280542  -2.80 Nf6+ Kxg7 Ne8+ Kg8 Nf6+ Kf7 Bxg6+ Kxg6 Qf5+ Kg7 Nh5+ Kg8 Nf6+ Kh8 Kg3 Ng5 a6 d5 Qf4 Bxe3 Qb8+ Kg7 Nxd5
 9/27  00:00     83761  414658  -2.92 Nf6+ Kxg7 Ne8+ Kg8 Nf6+ Kf7 Bxg6+ Kxg6 Qf5+ Kg7 Nh5+ Kg8 Kg3 Bxe3 Nf6+ Kg7 Nh5+ Kh8 Qxf3 Ng5 Qf5 b4 a6 Ne4+ Kf3
 9/27+ 00:00     88316  406986  -2.61 Qxe6+ Qxe6 Bd5
 9/27+ 00:00     88484  407760  -2.34 Qxe6+ Qxe6 Bd5 Qxd5 Nf6+ Kxg7 Nxd5
 9/27+ 00:00     90423  411013  -1.93 Qxe6+ Qxe6 Bd5 Qxd5 Nf6+ Kxg7 Nxd5 Kf7 Kg3
 9/27+ 00:00     92703  415708  -1.32 Qxe6+ Qxe6 Bd5 Qxd5 Nf6+ Kxg7 Nxd5 Kf7 Kg3 f2 Kg2
 9/27  00:00    101812  431406  -0.88 Qxe6+ Qxe6 Bd5 Qxd5 Nf6+ Kxg7 Nxd5 Kf7 Kg3 f2 Kg2 Ke6 Nc7+ Kd7 Nxb5 Kc6 Nd4+ Kc5 a6 Kb6
10/27+ 00:00    120897  463206  -0.80 Qxe6+ Qxe6 Bd5 Qxd5 Nf6+ Kxg7 Nxd5 Kf7 Kg3 f2 Kg2 Ke6 Nc7+ Kd7 Nxb5 Kc6 Nd4+ Kc5 a6 Kb6 Kf1 Kxa6
10/27+ 00:00    130362  484617  -0.71 Qxe6+ Qxe6 Bd5 Qxd5 Nf6+ Kxg7 Nxd5 Kf7 Kg3 f2 Kg2 Ke6 Nc7+ Kd7 Nxb5 Kc6 Nd4+ Kb7 Kf1 Ka6 Nc6 Kb5 Ne7 h5 gxh5 gxh5
10/28  00:00    147177  505762  -0.65 Qxe6+ Qxe6 Bd5 Qxd5 Nf6+ Kxg7 Nxd5 b4 Nxb4 Bxe3 a6 Kf7 Kg3 f2 Kg2 Ke6 Kf1 Ke5 Nc6+ Ke4 a7 Bxa7 Nxa7
11/28+ 00:00    187273  550802  -0.57 Qxe6+ Qxe6 Bd5 Qxd5 Nf6+ Kxg7 Nxd5 b4 Nxb4 Bxe3 a6 Kf7 Kg3 f2 Kg2 Ke6 Kf1 Ke5 Nc6+ Ke4 a7 Bxa7 Nxa7
11/33+ 00:00    222847  594258  -0.48 Qxe6+ Qxe6 Bd5 Qxd5 Nf6+ Kxg7 Nxd5 b4 Nxb4 Bxe3 a6 Kf7 Nd3 f2 Kg2 Ke6 Nxf2 Kd5 Nd1 Ba7 Kf3 Kc6
11/33+ 00:00    235146  617181  -0.35 Qxe6+ Qxe6 Bd5 Qxd5 Nf6+ Kxg7 Nxd5 b4 Nxb4 Bxe3 a6 Kf7 Nd3 f2 Kg2 Ke6 Nxf2 Kd5 Nd1 Ba7 Kf3 Kc6
11/33+ 00:00    256288  647191  -0.16 Qxe6+ Qxe6 Bd5 Qxd5 Nf6+ Kxg7 Nxd5 b4 Nxb4 Bxe3 a6 Kf7 Nd3 f2 Kg2 Ke6 Nxf2 Kd5 Nd1 Ba7 Kf3 Kc6
11/37  00:00    391867  671005  -0.05 Qxe6+ Qxe6 Bd5 Qxd5 Nf6+ Kxg7 Nxd5 h5 gxh5 b4 Nxb4 Bxe3 hxg6 Bd2 Nc6 Bxa5 Nxa5 Kxg6 Kg3 Kf5 Kf2 d5 Nc6
12/37- 00:00    564563  731299  -0.13 Qxe6+ Qxe6 Bd5 Qxd5 Nf6+ Kxg7 Nxd5 h5 gxh5 b4 Nxb4 Bxe3 hxg6 Bd2 Nc6 Bxa5 Nxa5 Kxg6 Kg3 Kf5 Kf2 d5 Nc6
12/42  00:00    616998  744267  +0.00 Qxe6+ Qxe6 Bd5 Qxd5 Nf6+ Kxg7 Nxd5 h5 a6 h4 a7 f2 Kg2 h3+ Kf1 h2 a8=Q h1=Q Qb7+ Kh6 g5+ Kxg5 Qe7+ Kf5 Qf6+ Ke4 Qd4+ Kf5 Qf6+
13/42  00:00    724023  789556  +0.00 Qxe6+ Qxe6 Bd5 Qxd5 Nf6+ Kxg7 Nxd5 h5 a6 h4 a7 f2 Kg2 h3+ Kf1 h2 a8=Q h1=Q Qb7+ Kh6 g5+ Kxg5 Qe7+ Kf5 Qf6+ Ke4 Qd4+ Kf5 Qf6+
14/42  00:01    922536  862989  +0.00 Qxe6+ Qxe6 Bd5 Qxd5 Nf6+ Kxg7 Nxd5 h5 a6 h4 a7 f2 Kg2 h3+ Kf1 h2 a8=Q h1=Q Qb7+ Kh6 g5+ Kxg5 Qe7+ Kf5 Qf6+ Ke4 Qd4+ Kf5 Qf6+
15/43  00:01   1234142  984164  +0.00 Qxe6+ Qxe6 Bd5 Qxd5 Nf6+ Kxg7 Nxd5 h5 a6 h4 a7 f2 Kg2 h3+ Kf1 h2 a8=Q h1=Q Qb7+ Kh6 g5+ Kxg5 Qe7+ Kf5 Qf6+ Ke4 Qd4+ Kf5 Qf6+
16/45  00:01   1812657 1202027  +0.00 Qxe6+ Qxe6 Bd5 Qxd5 Nf6+ Kxg7 Nxd5 h5 a6 h4 a7 f2 Kg2 h3+ Kf1 h2 a8=Q h1=Q Qb7+ Kh6 g5+ Kxg5 Qe7+ Kf5 Qf6+ Ke4 Qd4+ Kf5 Qf6+
17/46  00:01   2888717 1526806  +0.00 Qxe6+ Qxe6 Bd5 Qxd5 Nf6+ Kxg7 Nxd5 h5 a6 h4 a7 f2 Kg2 h3+ Kf1 h2 a8=Q h1=Q Qb7+ Kh6 g5+ Kxg5 Qe7+ Kf5 Qf6+ Ke4 Qd4+ Kf5 Qf6+
18/48  00:02   5080976 2096977  +0.00 Qxe6+ Qxe6 Bd5 Qxd5 Nf6+ Kxg7 Nxd5 h5 a6 h4 a7 f2 Kg2 h3+ Kf1 h2 a8=Q h1=Q Qb7+ Kh6 g5+ Kxg5 Qe7+ Kf5 Qf6+ Ke4 Qd4+ Kf5 Qf6+
19/54+ 00:03  11409352 3331197  +0.08 Qxe6+ Qxe6 Bd5 Qxd5 Nf6+ Kxg7 Nxd5 h5 a6 h4 a7 f2 Kg2 h3+ Kf1 h2 a8=Q h1=Q Qb7+ Kh6 g5+ Kxg5 Qe7+ Kf5 Qf6+ Ke4 Qd4+ Kf5 Qf6+
19/54+ 00:03  14036088 3665732  +0.17 Qxe6+ Qxe6 Bd5 Qxd5 Nf6+ Kxg7 Nxd5 h5 a6 h4 a7 f2 Kg2 h3+ Kf1 h2 a8=Q h1=Q Qb7+ Kh6 g5+ Kxg5 Qe7+ Kf5 Qf6+ Ke4 Qd4+ Kf5 Qf6+
19/54+ 00:04  17862949 4046884  +0.30 Qxe6+ Qxe6 Bd5 Qxd5 Nf6+ Kxg7 Nxd5 h5 a6 h4 a7 f2 Kg2 h3+ Kf1 h2 a8=Q h1=Q Qb7+ Kh6 g5+ Kxg5 Qe7+ Kf5 Qf6+ Ke4 Qd4+ Kf5 Qf6+
19/54+ 00:05  23539465 4526820  +0.49 Qxe6+ Qxe6 Bd5 Qxd5 Nf6+ Kxg7 Nxd5 h5 a6 h4 a7 f2 Kg2 h3+ Kf1 h2 a8=Q h1=Q Qb7+ Kh6 g5+ Kxg5 Qe7+ Kf5 Qf6+ Ke4 Qd4+ Kf5 Qf6+
19/54+ 00:06  31973976 5116654  +0.77 Qxe6+ Qxe6 Bd5 Qxd5 Nf6+ Kxg7 Nxd5 h5 a6 h4 a7 f2 Kg2 h3+ Kf1 h2 a8=Q h1=Q Qb7+ Kh6 g5+ Kxg5 Qe7+ Kf5 Qf6+ Ke4 Qd4+ Kf5 Qf6+
19/54+ 00:07  40866028 5593488  +1.20 Qxe6+ Qxe6 Bd5 Qxd5 Nf6+ Kxg7 Nxd5 h5 a6 h4 a7 f2 Kg2 h3+ Kf1 h2 a8=Q h1=Q Qb7+ Kh6 g5+ Kxg5 Qe7+ Kf5 Qf6+ Ke4 Qd4+ Kf5 Qf6+
19/54+ 00:08  51422292 6046124  +1.83 Qxe6+ Qxe6 Bd5 Qxd5 Nf6+ Kxg7 Nxd5 h5 a6 h4 a7 f2 Kg2 h3+ Kf1 h2 a8=Q h1=Q Qb7+ Kh6 g5+ Kxg5 Qe7+ Kf5 Qf6+ Ke4 Qd4+ Kf5 Qf6+
19/54+ 00:09  63908962 6520657  +2.79 Qxe6+ Qxe6 Bd5 Qxd5 Nf6+ Kxg7 Nxd5 h5 a6 h4 a7 f2 Kg2 h3+ Kf1 h2 a8=Q h1=Q Qb7+ Kh6 g5+ Kxg5 Qe7+ Kf5 Qf6+ Ke4 Qd4+ Kf5 Qf6+
19/58  00:12  84886893 7019506  +4.07 Qxe6+ Qxe6 Bd5 Qxd5 Nf6+ Kxg7 Nxd5 h5 gxh5 gxh5 a6 h4 Ne7 f2 Nf5+ Kf6 Kg2 Kxf5 a7 h3+ Kf1 h2 a8=Q b4 Qd5+ Kg4 Qxd6 Kf5 Qd5+ Kf6 Qd4+ Kg5 Qg7+ Kf5 Qh7+ Ke5 Qg7+ Ke6 Qb7 Ke5 Qb5+ Kf6 Qb6+ Kg5 Qa5+ Kf6 Qa6+ Ke7 Qb7+ Kf6 Qf3+ Ke6 Qg4+ Kf6 Qh4+ Ke6 Qc4+ Ke5 Qb5+
20/58+ 00:14 105529427 7301558  +4.32 Qxe6+ Qxe6 Bd5 Qxd5 Nf6+ Kxg7 Nxd5 h5 gxh5 gxh5 a6 h4 Ne7 f2 Nf5+ Kf6 Kg2 Kxf5 a7 h3+ Kf1 h2 a8=Q b4 Qd5+ Kg4 Qxd6 Kf5 Qd5+ Kf6 Qd4+ Kg5 Qg7+ Kf5 Qh7+ Ke5 Qh8+ Ke6 Qe8+ Kf6 Qc6+ Ke5 Qc5+ Kf6 Qf8+ Ke5 Qf4+ Ke6 Qh6+ Kf5 Qh7+
20/58+ 00:16 123261845 7439754  +4.57 Qxe6+ Qxe6 Bd5 Qxd5 Nf6+ Kxg7 Nxd5 h5 gxh5 gxh5 a6 h4 Ne7 f2 Nf5+ Kf6 Kg2 Kxf5 a7 h3+ Kf1 h2 a8=Q b4 Qd5+ Kg4 Qxd6 Kf5 Qd5+ Kf6 Qd4+ Kg5 Qg7+ Kf5 Qh7+ Ke5 Qh8+ Ke6 Qe8+ Kf6 Qc6+ Ke5 Qc5+ Kf6 Qf8+ Ke5 Qf4+ Ke6 Qh6+ Kf5 Qh7+
20/58+ 00:19 148586179 7702357  +4.95 Qxe6+ Qxe6 Bd5 Qxd5 Nf6+ Kxg7 Nxd5 h5 gxh5 gxh5 a6 h4 Ne7 f2 Nf5+ Kf6 Kg2 Kxf5 a7 h3+ Kf1 h2 a8=Q b4 Qd5+ Kg4 Qxd6 Kf5 Qd5+ Kf6 Qd4+ Kg5 Qg7+ Kf5 Qh7+ Ke5 Qg7+ Kf5
?

[acase]

[D]1nb3rr/2pp3p/p1k2P2/n1q1PN2/P1pR3N/b4PBp/1R2P3/1KQ5 w - - 1 1

Deep Fritz 10 solves this in a reasonable amount of time.



New game
1nb3rr/2pp3p/p1k2P2/n1q1PN2/P1pR3N/b4PBp/1R2P3/1KQ5 w - - 0 1

Analysis by Deep Fritz 10:

1.Ne7+ Qxe7 2.fxe7 Bxb2 3.Qxb2 Rxg3 4.e3 Rg7 5.Qxb8 Rxe7 6.f4 h2 7.Rd1
+/- (1.27) Depth: 8/39 00:00:00 526kN
1.Ne7+ Qxe7
+/- (0.99) Depth: 9/41 00:00:00 808kN
1.Ne7+ Qxe7 2.fxe7
+/- (0.99) Depth: 9/48 00:00:00 2322kN
1.Ne7+
+/- (1.27) Depth: 10/44 00:00:01 3245kN
1.Ne7+ Qxe7 2.fxe7 Bxb2 3.Rxc4+
+/- (1.27) Depth: 11/31 00:00:01 4101kN
1.Ne7+ Qxe7 2.fxe7 Bxb2 3.Rxc4+ Nxc4
+/- (1.27) Depth: 12/35 00:00:01 5426kN
1.Ne7+ Qxe7
+/- (0.99) Depth: 13/34 00:00:02 8965kN
1.Ne7+ Qxe7 2.fxe7 Bxb2 3.Rxc4+ Nxc4 4.Qxc4+ Kb7 5.Bf4 Ba3 6.Qb3+ Ka8 7.Qxa3
+/- (0.98) Depth: 13/34 00:00:02 9272kN
1.Ne7+
+/- (1.27) Depth: 14/38 00:00:02 15243kN
1.Ne7+ Qxe7 2.fxe7 Bxb2 3.Rxc4+ Nxc4 4.Qxc4+ Kb7 5.Bf4 Rg3 6.Bxg3
+/- (1.27) Depth: 15/38 00:00:05 34459kN
1.Ne7+ Qxe7 2.fxe7 Bxb2 3.Rxc4+ Nxc4 4.Qxc4+ Kb7 5.Bf4 Rg3 6.Bxg3
+/- (1.27) Depth: 16/38 00:00:10 71298kN
1.Ne7+ Qxe7
+/- (0.98) Depth: 17/42 00:00:22 170mN
1.Ne7+ Qxe7 2.fxe7
+/- (0.98) Depth: 17/42 00:00:22 172mN
1.Ne7+ Qxe7 2.fxe7 Bxb2 3.Rxc4+ Nxc4 4.Qxc4+ Kb7 5.Bf4 Nc6 6.Kxb2 Rg7
+/- (0.98) Depth: 18/44 00:00:48 387mN
1.Ne7+ Qxe7 2.fxe7 Bxb2 3.Rxc4+ Nxc4 4.Qxc4+ Kb7 5.Bf4 Nc6 6.Kxb2 Rg7 7.Nf5 Rg2 8.e6
+/- (0.98) Depth: 19/46 00:01:52 914mN
1.Ne7+ Qxe7
+/= (0.70) Depth: 20/50 00:04:22 2116mN
1.Ne7+ Qxe7 2.fxe7 Bxb2 3.Rxc4+ Nxc4 4.Qxc4+ Kb7 5.Bf4 Bxe5 6.Bxe5 Nc6 7.Qb3+ Ka8 8.Bxc7
= (0.00) Depth: 20/62 00:05:02 2440mN
1.Ne7+ Qxe7 2.fxe7 Bxb2 3.Rxc4+ Nxc4 4.Qxc4+ Kb7 5.Bf4 Bxe5 6.Bxe5 Nc6 7.Qb3+ Ka8 8.Bxc7 Rg1+ 9.Ka2 Re8 10.Nf5 Rg2 11.Ka3 Rxe2 12.Bf4 R8xe7
= (0.00) Depth: 21/51 00:10:45 5290mN
1.Rd6+
= (0.01) Depth: 21/51 00:11:11 5514mN
1.Rd6+
= (0.16) Depth: 21/51 00:11:13 5526mN
1.Rd6+
+/= (0.47) Depth: 21/51 00:11:14 5535mN
1.Rd6+
+/- (1.10) Depth: 21/51 00:11:17 5559mN
1.Rd6+ cxd6 2.Ne7+ Kc7 3.exd6+ Qxd6 4.Bxd6+ Bxd6 5.Nd5+ Kd8 6.Qe3 h2 7.Qb6+ Ke8 8.Qxd6 h1Q+ 9.Kc2 Qc1+ 10.Kxc1 Rg1+ 11.Kd2 Nbc6 12.Rb8 Kf7
+- (7.51) Depth: 21/66 00:14:54 7470mN
(Holiday, Columbus, Ohio 09.02.2012)

[Taner Altinsoy]

Houdini 2.0 on a windows 7 AMD X4 9850 Phenom with 1 gb hash (using only 3 cores) My Intel i5 laptop is much faster, finds Rd6 first at 1.48 as opposed to 10:09 on this machine.

FEN: 1nb3rr/2pp3p/p1k2P2/n1q1PN2/P1pR3N/b4PBp/1R2P3/1KQ5 w - - 1 1

Houdini_20_x64:
4/25 00:00 4.002 1.000.000 +0,36 Nf5e7+ Qc5xe7 f6xe7 Ba3xb2 Qc1xb2 Rg8xg3 Qb2xb8 h3h2 Rd4d1 Rg3g1
5/25 00:00 5.272 1.054.000 +0,36 Nf5e7+ Qc5xe7 f6xe7 Ba3xb2 Qc1xb2 Rg8xg3 Qb2xb8 h3h2 Rd4d1 Rg3g1
6/30 00:00 8.284 1.035.000 +0,09 Nf5e7+ Qc5xe7 f6xe7 Ba3xb2 Qc1xb2 Rg8xg3 Qb2xb8 h3h2 Rd4d1 Rg3g1 Qb8a8+ Bc8b7
7/30 00:00 16.173 951.000 -0,20 Nf5e7+ Qc5xe7 f6xe7 Ba3xb2 Qc1xb2 Rg8xg3 Qb2xb8 h3h2 Rd4d1 Rg3g1 Qb8a8+ Bc8b7 Qa8xh8 Rg1xd1+ Kb1c2
8/30 00:00 32.993 1.137.000 -0,49 Nf5e7+ Qc5xe7 f6xe7 Ba3xb2 Kb1xb2 Rg8xg3 Qc1f4 Rg3g8 Qf4h2 Kc6c5 Nh4f5 Nb8c6
9/30+ 00:00 88.803 1.776.000 -0,43 Nf5e7+
9/30 00:00 132.530 1.790.000 -0,56 Nf5e7+ Qc5xe7 f6xe7 Ba3xb2 Kb1xb2 Rg8xg3 Qc1f4 Rg3g8 Nh4f5 Kc6b7 Kb2c3 Nb8c6 Rd4d1 Kb7b8 Rd1b1+ Bc8b7
10/30+ 00:00 177.931 1.999.000 -0,49 Nf5e7+
10/30+ 00:00 181.225 2.013.000 -0,36 Nf5e7+
10/38+ 00:00 255.848 2.264.000 -0,06 Nf5e7+
10/39 00:00 415.579 2.473.000 +0,36 Nf5e7+ Qc5xe7 f6xe7 Ba3xb2 Rd4xc4+ Na5xc4 Qc1xc4+ Kc6b7 Bg3h2 Bb2d4 Qc4xd4 Nb8c6 Qd4c3 Rg8e8 f3f4 Nc6xe7 Qc3xh3 Kb7b8 f4f5 Ne7c6 Qh3b3+ Bc8b7 Nh4f3 Rh8f8 f5f6 Kb8c8
11/39 00:00 554.533 2.640.000 +0,36 Nf5e7+ Qc5xe7 f6xe7 Ba3xb2 Rd4xc4+ Na5xc4 Qc1xc4+ Kc6b7 Bg3h2 Bb2d4 Qc4xd4 Nb8c6 Qd4c3 Rg8e8 Qc3b3+ Kb7a8 f3f4 Nc6xe7 Qb3xh3 Ka8b8 f4f5 Ne7c6 Qh3b3+ Bc8b7 Nh4f3 Rh8f8 f5f6 Kb8c8
12/39- 00:00 1.035.940 3.011.000 +0,29 Nf5e7+ Qc5xe7
12/39 00:00 1.430.523 3.123.000 +0,27 Nf5e7+ Qc5xe7 f6xe7 Ba3xb2 Rd4xc4+ Na5xc4 Qc1xc4+ Kc6b7 Bg3h2 Nb8c6 Kb1xb2 Rg8g7 f3f4 Rg7xe7 Qc4b3+ Kb7a8 Nh4f5 Re7e6 Qb3xh3 d7d6 Qh3c3 d6xe5 f4xe5 Bc8d7 Qc3d3 Rh8b8+ Kb2c3
13/39- 00:00 1.831.886 3.271.000 +0,21 Nf5e7+ Qc5xe7
13/42+ 00:01 2.708.070 3.419.000 +0,34 Nf5e7+
13/44 00:01 2.953.065 3.429.000 +0,37 Nf5e7+ Qc5xe7 f6xe7 Ba3xb2 Rd4xc4+ Na5xc4 Qc1xc4+ Kc6b7 Bg3h2 Nb8c6 Kb1xb2 Rg8g7 f3f4 Rg7xe7 Qc4b3+ Kb7a8 Qb3xh3 Rh8f8 Nh4f5 d7d6 Qh3f3 Rf8xf5 Qf3xc6+ Bc8b7 Qc6c4 Rf5f8 e5xd6 c7xd6 Bh2g1 h7h5 f4f5 Ka8b8
14/44 00:01 3.633.410 3.527.000 +0,37 Nf5e7+ Qc5xe7 f6xe7 Ba3xb2 Rd4xc4+ Na5xc4 Qc1xc4+ Kc6b7 Bg3h2 Nb8c6 Kb1xb2 Rg8g7 f3f4 Rg7xe7 Qc4b3+ Kb7a8 Qb3xh3 Rh8f8 Nh4f5 d7d6 Qh3f3 Rf8xf5 Qf3xc6+ Bc8b7 Qc6c4 Rf5f8 e5xd6 c7xd6 Bh2g1 h7h5 f4f5 Ka8b8
15/44 00:01 5.572.123 3.695.000 +0,37 Nf5e7+ Qc5xe7 f6xe7 Ba3xb2 Rd4xc4+ Na5xc4 Qc1xc4+ Kc6b7 Bg3h2 Nb8c6 Kb1xb2 Rg8g7 f3f4 Rg7xe7 Qc4b3+ Kb7a8 Qb3xh3 Rh8f8 Nh4f5 d7d6 Qh3f3 Rf8xf5 Qf3xc6+ Bc8b7 Qc6c4 Rf5f8 e5xd6 c7xd6 Bh2g1 h7h5 f4f5 Ka8b8
16/50 00:02 9.512.877 3.911.000 +0,37 Nf5e7+ Qc5xe7 f6xe7 Ba3xb2 Rd4xc4+ Na5xc4 Qc1xc4+ Kc6b7 Bg3h2 Nb8c6 Kb1xb2 Rg8g7 f3f4 Rg7xe7 Qc4b3+ Kb7a8 Qb3xh3 Rh8f8 Nh4f5 d7d6 Qh3f3 Rf8xf5 Qf3xc6+ Bc8b7 Qc6c4 Rf5f8 e5xd6 c7xd6 Bh2g1 h7h5 f4f5 Ka8b8
17/50- 00:04 18.368.776 4.087.000 +0,30 Nf5e7+ Qc5xe7
17/50- 00:07 29.339.422 4.182.000 +0,17 Nf5e7+ Qc5xe7
17/50 00:09 38.795.970 4.190.000 +0,07 Nf5e7+ Qc5xe7 f6xe7 Ba3xb2 Rd4xc4+ Na5xc4 Qc1xc4+ Kc6b7 Bg3h2 Bb2xe5 Bh2xe5 Nb8c6 Qc4b3+ Kb7a8 Be5xh8 h3h2 Qb3xg8 h2h1Q+ Kb1c2 Nc6xe7 Qg8xh7 Ne7c6 Qh7g8 Ka8b8 Qg8c4 d7d6 Bh8b2 Kb8b7 Kc2d2 Qh1g1 f3f4 Qg1b6 Bb2c3
18/53- 00:16 67.079.317 4.160.000 0,00 Nf5e7+ Qc5xe7
18/53 00:19 78.428.539 4.169.000 +0,06 Nf5e7+ Qc5xe7 f6xe7 Ba3xb2 Rd4xc4+ Na5xc4 Qc1xc4+ Kc6b7 Bg3h2 Bb2xe5 Bh2xe5 Nb8c6 Qc4b3+ Kb7a8 Be5xh8 h3h2 Qb3xg8 h2h1Q+ Kb1c2 Nc6xe7 Qg8xh7 Ne7c6 Qh7g8 Ka8b8 Qg8c4 Qh1h2 Bh8c3 Kb8b7 Kc2d2 d7d6 Nh4g6 Bc8f5 Qc4f4 Qh2h5
19/55 00:28 120.489.961 4.259.000 +0,07 Nf5e7+ Qc5xe7 f6xe7 Ba3xb2 Rd4xc4+ Na5xc4 Qc1xc4+ Kc6b7 Bg3h2 Bb2xe5 Bh2xe5 Nb8c6 Qc4b3+ Kb7a8 Be5xh8 h3h2 Qb3xg8 h2h1Q+ Kb1c2 Nc6xe7 Qg8xh7 Ne7c6 Qh7g8 Ka8b8 Qg8c4 Qh1h2 Bh8c3 d7d6 Qc4xc6 Qh2xh4 Bc3a5 Bc8f5+ Kc2b2 Qh4d4+ Qc6c3 Qd4xc3+ Ba5xc3 Kb8b7 e2e4
20/55 00:58 200.427.685 3.456.000 +0,07 Nf5e7+ Qc5xe7 f6xe7 Ba3xb2 Rd4xc4+ Na5xc4 Qc1xc4+ Kc6b7 Bg3h2 Bb2xe5 Bh2xe5 Nb8c6 Qc4b3+ Kb7a8 Be5xh8 h3h2 Qb3xg8 h2h1Q+ Kb1c2 Nc6xe7 Qg8xh7 Ne7c6 Qh7g8 Ka8b8 Qg8c4 Qh1h2 Bh8c3 d7d6 Qc4xc6 Qh2xh4 Bc3a5 Bc8f5+ Kc2b2 Qh4d4+ Qc6c3 Qd4xc3+ Ba5xc3 Kb8b7 e2e4
21/58 02:51 546.885.494 3.192.000 +0,02 Nf5e7+ Qc5xe7 f6xe7 Ba3xb2 Rd4xc4+ Na5xc4 Qc1xc4+ Kc6b7 Bg3h2 Bb2xe5 Bh2xe5 Nb8c6 Qc4b3+ Kb7a8 Be5xh8 h3h2 Qb3xg8 h2h1Q+ Kb1c2 Nc6xe7 Qg8xh7 Ne7c6 Qh7g8 Ka8b8 Qg8c4 Qh1h2 Bh8c3 d7d6 Qc4xc6 Qh2xh4 Bc3a5 Qh4h7+ Kc2b2 Qh7f7 Qc6c3 c7c5 Qc3b3+ Qf7xb3+ Kb2xb3 Kb8b7 e2e4
22/63+ 03:39 664.705.015 3.031.000 +0,09 Nf5e7+
22/64+ 03:50 688.805.962 2.990.000 +0,22 Nf5e7+
22/65 04:46 833.376.575 2.909.000 +0,30 Nf5e7+ Qc5xe7 f6xe7 Ba3xb2 Rd4xc4+ Na5xc4 Qc1xc4+ Kc6b7 Bg3h2 Bb2xe5 Bh2xe5 Nb8c6 Qc4b3+ Kb7a8 Be5xc7 Rg8g1+ Kb1b2 Rh8e8 Nh4f5 Rg1g2 Qb3f7 Rg2xe2+ Kb2c1 Re8xe7 Nf5xe7 Re2e1+ Kc1d2 Re1xe7 Qf7h5 Ka8b7 Bc7d6 Re7e6 Bd6h2 d7d6 Qh5xh7+ Re6e7 Qh7d3 Nc6e5 Bh2xe5 Re7xe5 Qd3xd6 Re5e6 Qd6h2 Re6g6 Qh2h1 Rg6g2+ Kd2e3 Bc8f5 Ke3f4 Bf5e6 Qh1b1+ Kb7c6
23/66 08:37 1.488.530.675 2.876.000 +0,30 Nf5e7+ Qc5xe7 f6xe7 Ba3xb2 Rd4xc4+ Na5xc4 Qc1xc4+ Kc6b7 Bg3h2 Bb2xe5 Bh2xe5 Nb8c6 Qc4b3+ Kb7a8 Be5xc7 Rg8g1+ Kb1b2 Rh8e8 Nh4f5 Rg1g2 Qb3f7 Rg2xe2+ Kb2c1 Re8xe7 Nf5xe7 Re2e1+ Kc1d2 Re1xe7 Qf7h5 Ka8b7 Bc7d6 Re7e6 Bd6h2 d7d6 Qh5xh7+ Re6e7 Qh7d3 Nc6e5 Bh2xe5 Re7xe5 Qd3xd6 Re5e6 Qd6h2 Re6g6 Qh2h1 Rg6g2+ Kd2e3 Bc8f5 Ke3f4 Bf5e6 Qh1b1+ Kb7c6
23/71+ 10:09 1.769.641.629 2.905.000 +0,37 Rd4d6+
23/71+ 24:54 4.361.704.208 2.918.000 +6,25 Rd4d6+

[zullil]

My Intel i5 laptop is much faster, finds Rd6 first at 1.48

Can you reproduce that? Is Rd6+ found at depth 23?