Author: Robert Hyatt
Date: 13:58:08 12/08/97
Go up one level in this thread
On December 08, 1997 at 16:15:11, Rémi Coulom wrote:
>
>On December 08, 1997 at 04:10:05, Walter Ravenek wrote:
>
>>The maximum number of legal moves in a position I have across is 215,
>>which is the number of white moves in the following position:
>>
>>4Q1qk/1Q4RN/3Q3N/Q4Q1B/2Q4B/4Q3/1Q4R1/3Q3K w - -
>>
>>In Arthur I use an upper bound 255, which seems quite safe to me.
>>
>>Walter Ravenek
>
>Here is an old article from rgcc :
>
>sadlowsk@mathematik.uni-bielefeld.de (Bernhard Sadlowski) wrote:
>
>>1. no promoted pieces, without promotion moves: 109 white moves (W.Cross 1967)
depth time score variation (1)
1 0.00 49.05 Re7
1 0.00 Mate Ne6#
1-> 0.03 Mate Ne6#
2 0.03 Mate Ne6#
2-> 0.09 Mate Ne6#
>>2. no promoted pieces : 144 white moves (J.Ban 1960)
depth time score variation (1)
1 0.03 24.37 Qb2
1 0.19 41.21 bxc8=Q Rxe5 fxg8=Q Nxb6 h8=Q Rxd5
fxg3
exd2
1 0.23 42.08 dxc8=Q Nxb6 fxe8=Q
1 0.34 42.14 fxe8=Q Nxb6 bxc8=Q
1 0.52 42.25 bxa8=Q Rxa8 fxe8=Q Bxh7 Rxa8 exd2
1-> 0.74 42.25 bxa8=Q Rxa8 fxe8=Q Bxh7 Rxa8 exd2
2 0.91 ++ bxa8=Q!!
2 1.26 43.96 bxa8=Q Bxf7 dxc8=Q Rxc8 Nfxe3+ Kxf2
Rxc8
2 1.83 Mat02 Nf4+ Kxf2 Qxe3#
2-> 2.03 Mat02 Nf4+ Kxf2 Qxe3#
>>3. with promoted pieces : 218 white moves (Dickins 1968)
time surplus 57.74 time limit 30.99 (3:05)
depth time score variation (1)
1 0.00 Mate Rgxh2#
1-> 0.11 Mate Rgxh2#
2 0.11 Mate Rgxh2#
2-> 0.39 Mate Rgxh2#
>>4. with all 32 pieces : 99 white moves (HH.Cross 1946)
time surplus 1:27 time limit 31.53 (3:09)
depth time score variation (1)
1 6.29 1.41 Rxh8 Qxd8 Rxd8 Rxg1 Bxh1 Bxe5 Nxe5
Rxh1 cxb3 dxe2
1 18.87 4.78 Bxa8 Rxd8 Bxa1
1 19.43 Mate Qxb6#
1-> 19.62 Mate Qxb6#
2 19.70 Mate Qxb6#
2-> 19.85 Mate Qxb6#
>
>>(records taken from the book "Maerchenschach" by Anthony Dickins)
>
>>1. 5k2/2K5/3N1B2/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
>
>>Many chess programs will crash if you setup most of these positions (esp.
>>with the positions 2 and 3).
>
>>Bernhard
>>--
>>Bernhard Sadlowski
>><sadlowsk@mathematik.uni-bielefeld.de>
>
>Rémi
at least I can confirm mine works correctly with 'em. #4 was
interesting
as it represents the longest 1 ply search time I've ever seen. :)
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