Author: Shane Hudson
Date: 16:59:23 09/23/01
Go up one level in this thread
On September 23, 2001 at 07:37:44, guy haworth wrote:
>I answered a Q about endgame stats, posted a week ago.
>
>Others may be interested to know that the numbers of 1-0, draw and 0-1 positions
>(as %s of the 'unbroken' positions not featuring sntm in check) are posted at
>http://chess.jaet.org/endings/docs/ as part of John Tamplin's excellent,
>evolving endgame site.
>
Thanks for pointing this site out, and the documents. StarOffice was able
to read the Excel-format docs just fine.
I once wrote a small script to search my chess database (not a big one,
only about 350,000 games) to find how often each tablebase material
configuration is reached in master-level games. I've pasted results for
2-1, 2-2, 3-1 and 3-2 below if anyone is interested in them (I also have
4-1 and 3-3 but that would make the post long...)
I'm curious to know how often each tablebase file is probed by typical chess
engines over many games; it should be fairly easy to hack the egtb probing
code of crafty or any other free-with-source engine to collate such data.
Has anyone ever tried this?
Cheers,
Shane
--------
# Tablebase endgame frequency statistics
# Generated from the database "twic": 360966 games
# 2-1
KQ-K 115 KR-K 228 KB-K 75 KN-K 100 KP-K 941
# 2-2
KQ-KQ 83 KQ-KR 162 KQ-KB 13 KQ-KN 30 KQ-KP 366
KR-KR 179 KR-KB 120 KR-KN 155 KR-KP 844
KB-KB 18 KB-KN 30 KB-KP 145
KN-KN 35 KN-KP 215
KP-KP 1114
# 3-1
KQQ-K 7 KQR-K 10 KQB-K 21 KQN-K 22 KQP-K 73
KRR-K 3 KRB-K 22 KRN-K 7 KRP-K 142
KBB-K 14 KBN-K 86 KBP-K 191
KNN-K 7 KNP-K 171
KPP-K 231
# 3-2
KQQ-KQ 17 KQQ-KR 0 KQQ-KB 0 KQQ-KN 0 KQQ-KP 2
KQR-KQ 12 KQR-KR 57 KQR-KB 4 KQR-KN 1 KQR-KP 9
KQB-KQ 12 KQB-KR 10 KQB-KB 1 KQB-KN 1 KQB-KP 12
KQN-KQ 36 KQN-KR 5 KQN-KB 4 KQN-KN 6 KQN-KP 16
KQP-KQ 414 KQP-KR 92 KQP-KB 6 KQP-KN 18 KQP-KP 245
KRR-KQ 5 KRR-KR 15 KRR-KB 3 KRR-KN 5 KRR-KP 0
KRB-KQ 5 KRB-KR 253 KRB-KB 9 KRB-KN 1 KRB-KP 14
KRN-KQ 5 KRN-KR 168 KRN-KB 4 KRN-KN 3 KRN-KP 10
KRP-KQ 133 KRP-KR 3440 KRP-KB 225 KRP-KN 150 KRP-KP 410
KBB-KQ 2 KBB-KR 6 KBB-KB 19 KBB-KN 9 KBB-KP 12
KBN-KQ 6 KBN-KR 22 KBN-KB 23 KBN-KN 13 KBN-KP 71
KBP-KQ 51 KBP-KR 172 KBP-KB 225 KBP-KN 180 KBP-KP 577
KNN-KQ 0 KNN-KR 5 KNN-KB 0 KNN-KN 2 KNN-KP 25
KNP-KQ 53 KNP-KR 163 KNP-KB 282 KNP-KN 307 KNP-KP 538
KPP-KQ 241 KPP-KR 640 KPP-KB 192 KPP-KN 272 KPP-KP 1978
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