Author: Mike Hood
Date: 06:56:06 10/01/01
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Eugene, I think I understand your answer in part, but please help me further. I've quoted the whole file kbpk.tbs below, and I have three questions: 1) There is a Mate in 31 listed, but no Mate in 30 or Mate in 29. Is this because the Mate in 31 involves an immediate transition into another tablebase, such as kpk.tbs? Maybe if you could tell me the exact position of this Mate in 31 it would be obvious to me. 2) Why are no broken positions listed for btm? I presume that "wka1 wba6 wpa7 bkb1" is at least one broken position for btm. 3) All the numbers ought to be even, because every position containing one pawn can be mirrored left-right. Is the presence of odd numbers because your statistics are the number of positions in your already simplified/compressed chess board? Thanks, Mike kbpk.tbs ======== wtm: Draws: 174804 wtm: Mate in 31: 1 wtm: Mate in 28: 1 wtm: Mate in 26: 11 wtm: Mate in 25: 4 wtm: Mate in 24: 25 wtm: Mate in 23: 167 wtm: Mate in 22: 476 wtm: Mate in 21: 1917 wtm: Mate in 20: 6110 wtm: Mate in 19: 17489 wtm: Mate in 18: 36103 wtm: Mate in 17: 85135 wtm: Mate in 16: 150419 wtm: Mate in 15: 186502 wtm: Mate in 14: 209994 wtm: Mate in 13: 283840 wtm: Mate in 12: 406655 wtm: Mate in 11: 460888 wtm: Mate in 10: 442601 wtm: Mate in 9: 440135 wtm: Mate in 8: 436186 wtm: Mate in 7: 406369 wtm: Mate in 6: 303115 wtm: Mate in 5: 157067 wtm: Mate in 4: 68023 wtm: Mate in 3: 29622 wtm: Mate in 2: 9838 wtm: Mate in 1: 3118 wtm: Broken positions: 500513 btm: Lost in 0: 117 btm: Lost in 1: 873 btm: Lost in 2: 2793 btm: Lost in 3: 8892 btm: Lost in 4: 29591 btm: Lost in 5: 84157 btm: Lost in 6: 226693 btm: Lost in 7: 415728 btm: Lost in 8: 455096 btm: Lost in 9: 447616 btm: Lost in 10: 430805 btm: Lost in 11: 422716 btm: Lost in 12: 394004 btm: Lost in 13: 338834 btm: Lost in 14: 282260 btm: Lost in 15: 243794 btm: Lost in 16: 209974 btm: Lost in 17: 137192 btm: Lost in 18: 70856 btm: Lost in 19: 33990 btm: Lost in 20: 13627 btm: Lost in 21: 7010 btm: Lost in 22: 4168 btm: Lost in 23: 2492 btm: Lost in 24: 944 btm: Lost in 25: 384 btm: Lost in 26: 129 btm: Lost in 27: 48 btm: Lost in 28: 24 btm: Lost in 31: 2 btm: Draws: 859923 On September 28, 2001 at 13:37:24, Eugene Nalimov wrote: >DTM, not DTC. After capture or promotion resulting position is stored in the >other TB, not in the current one. > >Eugene > >On September 28, 2001 at 12:38:55, Mike Hood wrote: > >>Thanks for the reply, Eugene. I'm willing to accept I may be wrong, but how do >>you explain the discrepancies I named? >> >>Mike >> >>On September 28, 2001 at 11:11:33, Eugene Nalimov wrote: >> >>>There is no bug in TBSTAT, and statistics is correct. >>> >>>Eugene >>> >>>On September 28, 2001 at 08:27:37, Mike Hood wrote: >>> >>>>On September 19, 2001 at 04:23:39, Les Fernandez wrote: >>>> >>>>>Has anyone tabulated the total win-lose-draw-broken positions for first the 3 >>>>>then 4 and then the 5 piece sets? I know that the information is available on >>>>>Bobs ftp site but hoping that someone has already done it for both WTM and BTM >>>>>so I dont have to do them one by one. >>>>> >>>>>ie: >>>>> >>>>>EGTB WINS LOSE DRAW BROKEN >>>>> >>>>> 3 >>>>> 4 >>>>> 5 >>>> >>>>This is theoretically possible, but not very sensible at the moment. Most of the >>>>TBS files on Robert Hyatt's ftp server are defective, probably due to a bug in >>>>TBSTAT. >>>> >>>>For instance: >>>> >>>>krrk.tbs -- On black's move there are 1032 positions that lose in 16, but on >>>>white's move the longest mate is Mate in 7. >>>> >>>>kqrkr.tbs -- On black's move there are 60 moves that are Mate in 5, but there >>>>are ZERO moves that are Mate in 4. >>>> >>>>kbpk.tbs -- On white's move there is 1 position that is Mate in 31, but there >>>>are ZERO moves that are Mate in 30. >>>> >>>>In most of the TBS files the number of broken positions is not listed. >>>> >>>>Over 50% of the TBS files are obviously defective, and I can't vouch for the >>>>validity of the others. And, to ask a naive question, shouldn't the number of >>>>Mates/Losses/Draws in a pawnless tablebase always be divisible by 4? >>>> >>>>I've reported the bug to Eugene by email a few weeks ago, but it hasn't been >>>>fixed yet. >>>> >>>>Mike
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