Author: Mike Byrne
Date: 11:16:51 07/06/02
Go up one level in this thread
On July 06, 2002 at 09:47:59, Art Basham wrote:
>Qh6 mates in 12..!
>
>[D]1b4k1/r4p2/5Pp1/8/8/8/8/2Q4K w - -
>
>CM5500 takes 8 ply to find it.
>
>Fritz7 says that Qc8+ also mates!
My latest modified crafty beta (unreleased) does see the mate in 12 in several
seconds
White(1): 1b4k1/r4p2/5Pp1/8/8/8/8/2Q4K w - -
+---+---+---+---+---+---+---+---+
8 | | *B| | | | | *K| |
+---+---+---+---+---+---+---+---+
7 | *R| | | | | *P| | |
+---+---+---+---+---+---+---+---+
6 | | | | | | P | *P| |
+---+---+---+---+---+---+---+---+
5 | | | | | | | | |
+---+---+---+---+---+---+---+---+
4 | | | | | | | | |
+---+---+---+---+---+---+---+---+
3 | | | | | | | | |
+---+---+---+---+---+---+---+---+
2 | | | | | | | | |
+---+---+---+---+---+---+---+---+
1 | | | Q | | | | | K |
+---+---+---+---+---+---+---+---+
a b c d e f g h
White(1): d
White(1): go
end-game phase
clearing hash tables
time surplus 0.00 time limit 10:00 (10:00)
nss depth time score variation (1)
starting thread 1
10 0.31 7.06 1. Qc8+ Kh7 2. Qf8 Ra1+ 3. Kg2 Ra2+
4. Kf3 Ra3+ 5. Qxa3 Be5 6. Qe7 Bxf6
7. Qxf6 Kg8 8. Kg4 Kf8
10-> 0.33 7.06 1. Qc8+ Kh7 2. Qf8 Ra1+ 3. Kg2 Ra2+
4. Kf3 Ra3+ 5. Qxa3 Be5 6. Qe7 Bxf6
7. Qxf6 Kg8 8. Kg4 Kf8
11 0.74 7.41 1. Qc8+ Kh7 2. Qf8 Ra1+ 3. Kg2 Ra2+
4. Kf3 Ra3+ 5. Ke4 Ra4+ 6. Kd5 Ra5+
7. Kc4 Ra4+ 8. Kb3 Ra3+ 9. Kxa3 Bd6+
10. Qxd6 g5 11. Qd3+ Kh6 12. Kb3
11-> 0.75 7.41 1. Qc8+ Kh7 2. Qf8 Ra1+ 3. Kg2 Ra2+
4. Kf3 Ra3+ 5. Ke4 Ra4+ 6. Kd5 Ra5+
7. Kc4 Ra4+ 8. Kb3 Ra3+ 9. Kxa3 Bd6+
10. Qxd6 g5 11. Qd3+ Kh6 12. Kb3
12 1.20 ++ 1. Qc8+!!
12 7.27 Mat13 1. Qc8+ Kh7 2. Qf8 Ra1+ 3. Kg2 Ra2+
4. Kf3 Ra3+ 5. Ke4 Ra4+ 6. Kd5 Ra5+
7. Kc4 Ra4+ 8. Kb5 Rb4+ 9. Kc6 Rc4+
10. Kd5 Rd4+ 11. Kxd4 Be5+ 12. Kxe5
g5 13. Qg7# <HT>
12-> 7.28 Mat13 1. Qc8+ Kh7 2. Qf8 Ra1+ 3. Kg2 Ra2+
4. Kf3 Ra3+ 5. Ke4 Ra4+ 6. Kd5 Ra5+
7. Kc4 Ra4+ 8. Kb5 Rb4+ 9. Kc6 Rc4+
10. Kd5 Rd4+ 11. Kxd4 Be5+ 12. Kxe5
g5 13. Qg7# <HT>
solves 286/300 wac300 in one second
test results summary:
total positions searched.......... 300
number right...................... 286
number wrong...................... 14
percentage right.................. 95
percentage wrong.................. 4
total nodes searched.............. 41601173
average search depth.............. 4.5
nodes per second.................. 1103772
test results summary:
and 299/300 (!wac.230) in 10 seconds
nps were at 1.3 M
total positions searched.......... 300
number right...................... 299
number wrong...................... 1
percentage right.................. 99
percentage wrong.................. 0
total nodes searched.............. 146766154
average search depth.............. 4.6
nodes per second.................. 1298011
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