Author: Jeff Hlywa
Date: 15:52:46 12/02/03
Go up one level in this thread
On December 02, 2003 at 18:15:31, Art Basham wrote:
>[D]1b4k1/r4p2/5Pp1/8/8/8/8/2Q4K w - - 0 1
>
>Qc8 mates in 13, and
>Qh6 mates in 12...
>
>My Yace engine found both solutions right away ....and announced mate!
>
>This seems to be too difficult for portables becuase it takes about 13 ply to
>solve.
It took bogo (my homemade engine) a long time to find this one (I guess that's
the penalty for not evaluating checks in the qsearch). Looks like it also lost
the PV in the hash table too.
White (1): go
ply | score | time | nodes | qnodes | pc
1 | 3.90 | 0.00 | 24 | 24 | Qc8+ Kh7
2 | 3.90 | 0.00 | 70 | 59 | Qc8+ Kh7
3 | 3.90 | 0.00 | 625 | 427 | Qc8+ Kh7 Qh3+ Kg8 Qc8+ Kh7
Qh3+ Kg8 Qc8+
4 | 3.90 | 0.00 | 1157 | 585 | Qc8+ Kh7 Qh3+ Kg8 Qc8+ Kh7
Qh3+ Kg8 Qc8+
5 | 3.90 | 0.02 | 5104 | 2807 | Qc8+ Kh7 Qh3+ Kg8 Qc8+ Kh7
Qh3+ Kg8 Qc8+
6 | 3.90 | 0.02 | 9571 | 5248 | Qc8+ Kh7 Qh3+ Kg8 Qc8+ Kh7
Qh3+ Kg8 Qc8+
7+| 4.40 | 0.13 | 37116 | 25272 | Qc8+
7 | 5.56 | 0.14 | 67211 | 45115 | Qc8+ Kh7 Qf8 Ra1+ Kg2 Ra2+ Kf3
Ra3+ Qxa3 Kg8 Ke2
8 | 5.56 | 0.17 | 108068 | 67402 | Qc8+ Kh7 Qf8 Ra1+ Kg2 Ra2+ Kf3
Ra3+ Qxa3 Kg8 Ke2
9+| 6.06 | 1.10 | 351464 | 222369 | Qc8+
9 | 6.64 | 0.96 | 571339 | 345630 | Qc8+ Kh7 Qf8 Ra1+ Kg2 Ra2+ Kf3
Ra3+ Qxa3 Be5 Qe7 Bd4 Qxf7+ Kh6
10 | 6.64 | 0.78 | 765507 | 438285 | Qc8+ Kh7 Qf8 Ra1+ Kg2 Ra2+ Kf3
Ra3+ Qxa3 Be5 Qe7 Bd4 Qxf7+ Kh6
11 | 6.72 | 15.72 | 3764338 | 2155764 | Qc8+ Kh7 Qf8 Ra1+ Kg2 Ra2+ Kh3
Ra3+ Qxa3 Be5 Qe7 Bd4 Qxf7+ Kh6 Qf8+ Kg5
f7
12 | 6.72 | 33.95 | 11488922 | 5992496 | Qc8+ Kh7 Qf8 Ra1+ Kg2 Ra2+ Kh3
Ra3+ Qxa3 Be5 Qe7 Bd4 Qxf7+ Kh6 Qf8+ Kg5
f7
13+| 7.22 | 168.13 | 36609431 | 20345866 | Qc8+
13 | Mat12 | 206.26 | 81356540 | 44099947 | Qh6 Ra1+ Kg2 Ra2+ Kf1 Ra1+ Ke2
Ra2+ Kd3 Ra3+ Kc4 Ra4+ Kb5 Rb4+ Kc6 Rc4+
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