Author: Robert Hyatt
Date: 09:04:51 10/01/01
Go up one level in this thread
On October 01, 2001 at 09:56:06, Mike Hood wrote: >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. Most likely it is a transposition into a KBN vs K endings. In a position where promoting to a queen would be a stalemate. > >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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