Eelco de Groot wrote:
24.01 175:51 +15.55 1.Nxh7 Kxh7 2.Qh4+ Kg8 3.Bh6 Bg4
4.Bg7 Bh5 5.Qg5 Ng4 6.Be2 Nxf6
7.Bxf6 Qf8 8.Bxh5 Nd7 9.Bxg6 Nxf6
10.Bxf7+ Kh8 11.Bg6 Rh7 12.Bxh7 Qg7
13.Qxf6 Qxf6 14.Rxf6 (5.350.193.002) 507
best move: Ng5xh7 time: 294:04.047 min n/s: 510.883 nodes: 9.014.040.382
I read "mate in eight" but Marc wrote "mate in h8". Now I understand why Rainbow Serpent could not find it...
This is a more precise variation I think, but now the 11th ply arrives only after one minute and although Nxf7 is found a few plies earlier, this is still after one minute
But still I think the idea was not so bad. It's just the implementation that is a bit amateuristic/sucks bigtime. Please choose the phrasing you like best.
[D]rnbq2k1/p1r2p1p/1p1p1Pp1/1BpPn1N1/P7/2P5/6PP/R1B1QRK1 w - -
Engine: Rainbow Serpent 1.6.3s(dc) Build 212 (Athlon 2009 MHz, 256 MB)
by Tord Romstad, Marco Costalba, Joona Kiiski Modifications: Dann Corbit
1.00 0:00 +3.91 1.Qh4 (101) 0
2.00 0:00 +1.17 1.Qh4 h5 (357) 1
3.00 0:00 +1.17 1.Qh4 h5 2.a5 (32.376) 115
4.00 0:00 +1.17 1.Qh4 h5 2.a5 bxa5 3.Rxa5 Rb7 (89.655) 212
5.00 0:00 +1.33 1.Qh4 h5 2.Qe4 Kh8 3.Be2 Qg8 4.a5 (260.209) 326
5.00 0:01 +1.33 1.a5 bxa5 2.Nxh7 Kxh7 3.Qh4+ Kg8
4.Bh6 Bg4 5.Bg7 Bh5 6.Be2 a6 7.Bxh5 gxh5
8.Rxa5 (485.888) 384
6.01 0:01 +1.34 1.a5 bxa5 2.Nxh7 Kxh7 3.Qh4+ Kg8
4.Bh6 Bg4 5.Bg7 Bh5 6.Be2 Rd7 7.Bxh5 gxh5
8.Qxh5 Ng6 9.Qh6 a6 (510.352) 393
6.02 0:01 +1.34 1.Qh4 h5 2.Qe4 Kh8 3.a5 bxa5 4.Be2 Bg4
5.Bxg4 Nxg4 6.c4 Rb7 (598.842) 399
6.03 0:04 +1.35 1.Qe4 a6 2.Be2 h6 3.Ne6 fxe6 4.Bc4 Kh8
5.dxe6 d5 6.Qxe5 dxc4 7.Bxh6 (2.387.188) 478
6.04 0:05 +1.67++ 1.Bf4 a6 2.Bxe5 dxe5 3.d6 Rb7 4.Qh4 h5
5.Bc4 Nc6 6.Qe4 Qxd6 7.Bd5 (2.551.965) 481
7.01 0:06 +2.46 1.Bf4 h6 2.Ne4 a6 3.Nxd6 Ng4 4.Qe8+ Qxe8
5.Nxe8 Rd7 6.Bxd7 Nxd7 7.Nc7 Ra7
8.d6 Ndxf6 9.h3 (3.196.025) 488
8.01 0:11 +2.90 1.Bf4 h6 2.Ne4 Rb7 3.Bxh6 a6 4.Be2 Bf5
5.Qh4 Bxe4 6.Qxe4 (5.587.866) 500
9.01 0:15 +2.38 1.Bf4 Kh8 2.Qh4 h5 3.Bxe5 dxe5 4.Qe4 Qd6
5.Bc4 Ba6 6.Bb5 (7.607.370) 501
10.01 0:20 +1.57 1.Bf4 Nbd7 2.Bxd7 Rxd7 3.Bxe5 dxe5
4.Ne6 fxe6 5.dxe6 Ba6 6.exd7 Bxf1
7.Qxf1 Qxd7 (10.600.829) 506
11.01 0:49 +1.17 1.Bf4 Nbd7 2.Bxd7 Rxd7 3.Qh4 h5
4.Bxe5 dxe5 5.c4 Qe8 6.Rae1 Rb7
7.Nf3 e4 8.Rxe4 Qxa4 9.Ne5 (25.672.425) 520
11.02 1:00 +2.02 1.a5 Rb7 2.Qh4 h5 3.a6 Rc7 4.Qg3 Kh8
5.Bf4 Nbd7 6.Ne4 Qf8 7.Rae1 Rb8
8.Nxd6 Qxd6 9.Bxe5 Nxe5 10.Qxe5 (30.867.085) 512
11.04 1:01 +3.72++ 1.Nxh7 Kxh7 2.Qh4+ Kg8 3.Bh6 Bg4
4.Bg7 Bh5 5.Qg5 Bf3 6.gxf3 (31.616.032) 513
12.01 1:03 +7.39 1.Nxh7 Kxh7 2.Qh4+ Kg8 3.Bh6 Bg4
4.Bg7 Bh5 5.Qg5 Ng4 6.h3 a6 7.hxg4 axb5
8.Qh6 bxa4 9.gxh5 (32.344.424) 513
13.01 1:13 +6.62 1.Nxh7 Kxh7 2.Qh4+ Kg8 3.Bh6 Bg4
4.Bg7 Bh5 5.Qg5 Ng4 6.h3 Nxf6 7.Bxf6 Qf8
8.g4 Nd7 9.Be7 f6 10.Bxf8 fxg5
11.Bxd6 Rb7 12.Bc6 Bxg4 13.hxg4 (38.194.206) 519
14.01 1:16 +6.62 1.Nxh7 Kxh7 2.Qh4+ Kg8 3.Bh6 Bg4
4.Bg7 Bh5 5.Qg5 Ng4 6.h3 Nxf6 7.Bxf6 Qf8
8.g4 a6 9.gxh5 axb5 10.hxg6 fxg6
11.Qxg6+ Qg7 12.Bxg7 Rxg7 13.Qxg7+ Kxg7
14.axb5 (39.949.032) 521
15.01 1:21 +7.39++ 1.Nxh7 Kxh7 2.Qh4+ Kg8 3.Bh6 Bg4
4.Bg7 Bh5 5.Qg5 Ng4 6.h3 Nxf6 7.Bxf6 Qf8
8.g4 a6 9.gxh5 axb5 10.hxg6 fxg6
11.Qxg6+ Qg7 12.Bxg7 Rxg7 13.Qxg7+ Kxg7
14.axb5 (43.064.379) 525
16.01 1:23 +6.50 1.Nxh7 Kxh7 2.Qh4+ Kg8 3.Bh6 Bg4
4.Bg7 Bh5 5.Qg5 Ng4 6.h3 Nxf6 7.Bxf6 Qf8
8.g4 a6 9.gxh5 axb5 10.hxg6 fxg6
11.Qxg6+ Qg7 12.Bxg7 Rxg7 13.Qxg7+ Kxg7
14.axb5 (44.090.215) 527
17.01 1:35 +7.43 1.Nxh7 Kxh7 2.Qh4+ Kg8 3.Bh6 Bg4
4.Bg7 Bh5 5.Qg5 Ng4 6.h3 Nxf6 7.Bxf6 Qf8
8.g4 a6 9.gxh5 axb5 10.hxg6 fxg6
11.Qxg6+ Qg7 12.Bxg7 Rxg7 13.Qxg7+ Kxg7
14.axb5 (50.894.121) 533
18.01 2:17 +8.08 1.Nxh7 Kxh7 2.Qh4+ Kg8 3.Bh6 Bg4
4.Bg7 Bh5 5.Qg5 Ng4 6.h3 Nxf6 7.Bxf6 Qf8
8.g4 a6 9.gxh5 axb5 10.hxg6 fxg6
11.Qxg6+ Qg7 12.Bxg7 Rxg7 13.Qxg7+ Kxg7
14.axb5 (74.026.159) 538
19.01 4:45 +9.69 1.Nxh7 Kxh7 2.Qh4+ Kg8 3.Bh6 Bg4
4.Bg7 Bh5 5.Qg5 Ng4 6.h3 Nxf6 7.Bxf6 Qf8
8.g4 a6 9.gxh5 axb5 10.hxg6 fxg6
11.Rae1 Na6 12.Re6 Rf7 13.axb5 Nc7
14.Qxg6+ (155.316.359) 544
20.01 15:12 +10.86 1.Nxh7 Kxh7 2.Qh4+ Kg8 3.Bh6 Bg4
4.Bg7 Bh5 5.Qg5 Ng4 6.h3 Nxf6 7.Bxf6 Qf8
8.g4 a6 9.gxh5 axb5 10.hxg6 fxg6
11.Rae1 Na6 12.Re6 Rf7 13.axb5 Nc7
14.Qxg6+ (388.569.833) 425
21.01 34:39 +11.59 1.Nxh7 Kxh7 2.Qh4+ Kg8 3.Bh6 Bg4
4.Bg7 Bh5 5.Qg5 Ng4 6.h3 Nxf6 7.Bxf6 Qf8
8.g4 a6 9.gxh5 axb5 10.hxg6 fxg6
11.Rae1 Na6 12.Re6 Rf7 13.axb5 Nc7
14.Qxg6+ (779.771.521) 375
22.01 90:04 +12.32 1.Nxh7 Kxh7 2.Qh4+ Kg8 3.Bh6 Bg4
4.Bg7 Bh5 5.Qg5 Ng4 6.h3 Nxf6 7.Bxf6 Qf8
8.g4 a6 9.gxh5 axb5 10.hxg6 fxg6
11.Rae1 Na6 12.Re6 Rf7 13.axb5 Nc7
14.Qxg6+ (1.680.904.071) 311
23.01 161:10 +12.76 1.Nxh7 Kxh7 2.Qh4+ Kg8 3.Bh6 Bg4
4.Bg7 Bh5 5.Qg5 Ng4 6.h3 Nxf6 7.Bxf6 Qf8
8.g4 a6 9.gxh5 axb5 10.hxg6 fxg6
11.Rae1 Na6 12.Re6 Rf7 13.axb5 Nc7
14.Qxg6+ (2.801.973.000) 289
Eval is lower but 6. h3 is just a bit more precise than 6. Be2 that other versions of Rainbow Serpent play. Rybka 2.3.2a thinks 6. Rf4 is even stronger but from the start position that is too deep for Rainbow Serpent.
[D]rn1q2k1/p1r2pB1/1p1p1Pp1/1BpP2Qb/P5n1/2P5/6PP/R4RK1 w - -
Engine: Rybka 2.3.2a PV-tips32-bit (64 MB)
by Vasik Rajlich
16 9:24 +9.15 6.Rf4 Nd7 7.Bxd7 Nxf6 8.Bxf6 Rxd7
9.Bxd8 Raxd8 10.g4 Re8 11.gxh5 Re5
12.Qg4 Rc7 13.hxg6 fxg6 14.Rf6 Rg7
15.Rxd6 Kh7 16.Rd7 Rf5 (17.665.765) 32
16 10:27 +5.90 6.h3 Nxf6 7.Rxf6 Kxg7 8.Rxg6+ Bxg6
9.Qxd8 Rb7 10.a5 bxa5 11.Bc6 Nxc6
12.Qxa8 Rb2 13.Qxc6 Be4 14.Qxd6 Rxg2+
15.Kf1 Rg5 16.Rxa5 Rxd5 17.Qg3+ Bg6
18.Rxa7 c4 (19.400.421) 31
____________________________________________________________
17 16:12 +9.53 6.Rf4 Nd7 7.Bxd7 Nxf6 8.Bxf6 Rxd7
9.Bxd8 Raxd8 10.g4 Re8 11.gxh5 Re5
12.Qg4 Rc7 13.hxg6 fxg6 14.Rf6 Rg7
15.Rxd6 Kh7 16.Rd7 Rxd7 17.Qxd7+ (30.379.352) 31
17 19:43 +6.60 6.h3 Nxf6 7.Rxf6 Kxg7 8.Rxg6+ Bxg6
9.Qxd8 Rb7 10.a5 bxa5 11.Bc6 Nxc6
12.Qxa8 Rb6 13.dxc6 Be4 14.Qxa7 Rxc6
15.Rxa5 Kf6 16.Qb7 Bd5 17.Ra7 Ke5 (36.948.587) 31
After 6. Be2 Rybka would play Nxf6, and Rainbow Serpent's choice continuation in that case, 6... Nd7 is, after a very long think, falling to -11
[FEN "rnbq2k1/p1r2p1p/1p1p1Pp1/1BpPn1N1/P7/2P5/6PP/R1B1QRK1 w - -"]
1. Nxh7 Kxh7 2. Qh4+ Kg8 3. Bh6 Bg4 4. Bg7 Bh5 5. Qg5 Ng4
6. Be2 *
[D]rn1q2k1/p1r2pB1/1p1p1Pp1/2pP2Qb/P5n1/2P5/4B1PP/R4RK1 b - -
Engine: Rybka 2.3.2a PV-tips32-bit (64 MB)
by Vasik Rajlich
16 1:39 -4.89 6...Nd7 7.Bxg4 Nf8 8.Bxh5 Nh7 9.Qg3 Nf8
10.Bg4 Nh7 11.Qh4 c4 12.Rae1 Rc5
13.Re7 Rxd5 14.Bf3 (2.848.761) 29
16 2:12 -6.72 6...Nxf6 7.Bxf6 Qf8 8.Bxh5 Nd7
9.Bxg6 Nxf6 10.Bxf7+ Kh8 11.Rxf6 Qxf7
12.Rxf7 Rxf7 13.Re1 Raf8 14.Qh6+ Kg8
15.Qxd6 Kh8 16.Qe5+ Kh7 17.d6 Kg8
18.h4 Kh7 19.Kh2 Rg7 (4.092.698) 31
____________________________________________________________
19 16:40 -7.14 6...Nxf6 7.Bxf6 Qf8 8.Bxh5 Nd7
9.Bxg6 Nxf6 10.Bxf7+ Kh8 11.Rxf6 Qxf7
12.Rxf7 Rxf7 13.Re1 Raf8 14.Qh6+ Kg8
15.Qxd6 Rf6 16.Qg3+ Kh8 17.d6 R6f7
18.Qe5+ (30.402.405) 31
19 13:53 -7.63 6...Nd7 7.Bxg4 Nf8 8.Bxh5 Nh7 9.Qg3 Qd7
10.Rae1 Rd8 11.Re7 Qxe7 12.fxe7 Rxe7
13.Bh6 Kh8 14.c4 Rde8 15.Bg4 f5
16.Bh3 Rg8 (23.934.366) 29
_____________________________________________________________
20 29:13 -7.44 6...Nxf6 7.Bxf6 Qf8 8.Bxh5 Nd7
9.Bxg6 Nxf6 10.Bxf7+ Kh8 11.Rxf6 Rxf7
12.Raf1 Qg8 13.Qxg8+ Kxg8 14.Rxf7 a6
15.Rd7 b5 16.Rf4 Rb8 17.Rxd6 Kg7
18.Rxa6 b4 19.Rc4 (53.192.735) 31
20 106:45 -11.71 6...Nd7 7.Bxg4 Nf8 8.Bxh5 Nh7 9.Qh6 gxh5
10.Rf3 Re7 11.fxe7 Qxe7 12.Rg3 Qh4
13.Bf6+ Qxg3 14.hxg3 Nxf6 15.Qxf6 a6
16.Qxd6 Re8 17.Qxb6 c4 18.Qxa6 (245.492.799) 39
best move: Ng4xf6 time: 149:38.219 min n/s: 37.837 nodes: 331.752.594