Author: Robert Hyatt
Date: 11:56:32 09/20/99
Go up one level in this thread
On September 20, 1999 at 11:53:07, Shep wrote:
>On September 20, 1999 at 11:05:05, Andreas Stabel wrote:
>
>
>>1. no promoted pieces, without promotion moves: 109 white moves (W.Cross 1967)
>>2. no promoted pieces : 144 white moves (J.Ban 1960)
>>3. with promoted pieces : 218 white moves (Dickins 1968)
>>4. with all 32 pieces : 99 white moves (HH.Cross 1946)
>>
>>1. 5k2/2K5/3N1B1P/P1NB4/6Q1/4R3/P1PP1P1P/1R6 w - - 0 1
>>2. n1r1r1b1/1P1P1P1P/1Q6/3NBNK1/R7/4p1p1/3PBPkP/2R5 w - - 0 1
>>3. 3Q4/1Q4Q1/4Q3/2Q4R/Q4Q2/3Q4/1Q4Rp/1K1BBNNk w - - 0 1
>>4. q2Q3r/n6R/kpB1N1K1/p1p1Bppp/1PN3P1/1n1pp1b1/P1PPPP1P/r5Rb w - - 0 1
>>
>>Theese positions may break several chess engines :)
>
>#3 broke every one I tried about 1 year ago: Crafty, MChess, Fritz, ... :)
>
>---
>Shep
Are you sure it broke crafty? I just tried 16.18, 16.19, 16.0, 15.0 and all
find an instant mate (Rhxh2#). I can't think of any reason such a position would
break crafty... it has no internal arrays for pieces, or anything else. It has
no fixed move length array either, ie if you could make a position with 3000
moves for one side, it would have no problems with it...
here is output:
White(1): d
+---+---+---+---+---+---+---+---+
8 | | | | Q | | | | |
+---+---+---+---+---+---+---+---+
7 | | Q | | | | | Q | |
+---+---+---+---+---+---+---+---+
6 | | | | | Q | | | |
+---+---+---+---+---+---+---+---+
5 | | | Q | | | | | R |
+---+---+---+---+---+---+---+---+
4 | Q | | | | | Q | | |
+---+---+---+---+---+---+---+---+
3 | | | | Q | | | | |
+---+---+---+---+---+---+---+---+
2 | | Q | | | | | R | *P|
+---+---+---+---+---+---+---+---+
1 | | K | | B | B | N | N | *K|
+---+---+---+---+---+---+---+---+
a b c d e f g h
White(1): move
clearing hash tables
time surplus 0.00 time limit 30.00 (3:00)
nss depth time score variation (1)
1 0.00 103.55 1. Nxh2
1 0.01 ++ 1. Rhxh2#!!
1 0.01 Mate 1. Rhxh2#
1-> 0.01 Mate 1. Rhxh2#
2 0.01 Mate 1. Rhxh2#
2-> 0.02 Mate 1. Rhxh2#
3 0.02 Mate 1. Rhxh2#
3-> 0.16 Mate 1. Rhxh2#
4 0.17 Mate 1. Rhxh2#
4-> 2.32 Mate 1. Rhxh2#
time=2.32 cpu=99% mat=102 n=475999 fh=100% nps=205171
ext-> checks=24289 recaps=170 pawns=0 1rep=4454 thrt:0
predicted=0 nodes=475999 evals=1
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