CCRL Discussion Board

My first 7-man annotation: http://www.youtube.com/watch?v=2h_b0puS8Vk ... I think I said this before, but I envision that in future tablebase interfaces, annotations will pop up whenever a position is queried. Thanks for this analysis! Very nice! I like your idea too. It is very hard to implement b...

Some discussion about FinalGen on the Talkchess forum:
http://talkchess.com/forum/viewtopic.ph ... w=&start=0

A very nice tool! Thanks!

I have managed to run 'RobboExplorative'. Be sure you have the latest JRE and to copy the RobboBaseLib.dll from IvanHoe999946f\Windows\Mode_Game_Play\ in the same directory as RobboExplorer.exe. You will run the program not by clicking on RobboExplorer.exe, instead of that you need to run RobboExplo...

More info on Robbobases, etc.:
http://www.open-chess.org/viewtopic.php ... =30#p15173

Check these links:

http://ippolit.wikispaces.com/RobboBases
http://ippolit.wikispaces.com/RobboTripleBases

The webpage looks like an insane joke but the chess tablebases and bitbases presented there are serious work.

If the wK is on b1, c1, c2, d1, d2, or d3, then yes, you have 63 squares for the bK.
If the wK is on the long diagonal, you may choose to place the bK only above the a1-h8 diagonal, to reduce that number to 35.

kkkkkkkk/kkkkkkk1/kkkkkk2/kkkkk3/kkkk4/kkk5/kk6/K7 w - - 0 1

In a pawnless tablebase the (first) White King always goes to the following squares: 8/8/8/8/3K4/2KK4/1KKK4/KKKK4 b - - 0 1 So you will have a factor of 10 for that piece instead of 64. But what if during generation the wK moves out of the triangle? Then you should rotate/flip the position in a way ...

If there is a pawn in a position you have only left-right symmetry. It is enough to save positions with the pawn on the left side of the board.(With more pawns you place the first pawn on the left side.) The pawnless positions have 8-fold symmetry so you always place one of the white kings on a1, b1...

Some Vital Type B1 zugzwangs from Polgar Starchess: http://polgarstarchess.com/vital1a.jpg 1.K25 K34 2.K19 K27 3.K20 K34 4.K21 P7 5.27Q# http://polgarstarchess.com/vital2a.jpg 1.K31 (1.K20? K32 2.K21 K25 3.K16 K20 4.K9 K14! zz = ) 1.-K27 2.K24! K34 3.K19! K33 4.K25 K34 5.K20 K27 6.P33! K33 7.K21 K32...

Skipper_NORTON wrote:http://depositfiles.com/ru/files/sg49e74um

Files of statistic of 6-chessman tablebases.

Thanks! Do you have any 7-men tablebase statistics? A mutual zugzwangs list also would be very useful!

This is a fascinating study but I wonder if Black's 16...Qxb6+ (hoping that White would get on the wrong foot with regard to the Trebuchet position) qualifies as 'best defence' as Study Protocol requires. It is the best defence! (In a game it would be a bad move but chess studies are using differen...

g)Identifying the "key positions" in a tablebase. (Positions whose evaluation affects the value of lot of other positions.) Examples are the "critical position" and the "winning position" from the previous study. It would be nice to have a number attached to each positi...

He states that, here, “16.Qa5 again is a simple time losing move” but this is a good example of the difficulty of assessing whether moves are time-wasting or not. I have not been able to convince myself that it is. How does one explore the tree of moves systematically to prove this, especially when...

This discussion reminds me the following study by Siegfried Hornecker: Mat Plus, 2009 7k/6p1/3p4/p2P2P1/P7/8/8/5K2 White wins 1. g6 Kg8 2. Ke2 Kf8 3. Kd3 Ke7 4. Kc4 Kf6 5. Kb5 Kxg6 6. Kxa5 Kf5 7. Kb5 $1 g5 8. a5 g4 9. a6 g3 10. a7 g2 11. a8=Q g1=Q 12. Qa3 Ke4 13. Kc6 $1 Qd4 14. Qa5 Kf5 15. Qb5 Kf6 1...

It only means for us that this is not impossible to do.

See the end of the following page: http://www.vlasak.biz/tablebase.htm

"☉" - Move leads to a mutual zugzwang. Then there is a serious bug... Look at the 5 pieces maxDTM. 1.Rb3 doesn't lead to mutual zugzwang, black just captures the rook. Probably you have marked with circles the positions with different outcome if WTM and BTM. Only a small percentage of the...

Nice! What are those circles and squares?

XY has generated a 100GB tablebase (60GB WTM + 40GB BTM) in 20 days and wants to share it with you. What to do? a.Download the whole 100GB = 10 days b.Download only the 40GB BTM file (4 days) + generate the WTM file yourself (12 days) = 16 days (but less internet traffic than with a.) c.Download a b...

I have updated one of my previous posts with the 3-men and 4-men maxDTM data.

No, I don't have calculated that numbers yet but in the following days I will prepare an Excel document with more data.

Kirill Kryukov wrote:MaxDepth tables look beautiful, I wonder how to do the same with 6 pieces, 7, ...

Thanks! I wish some day I will have the same problem...

How do you compute the AverageDTM? Is it for all positions, where draw counts as 0, or only for won/lost positions? I'm curious to compute the AvgDepth in my variants. My mistake: actually it is the Average_maxDTM what I have computed here. I will change the captions. I would leave out the draws in...

http://www.polgarstarchess.com/DTM%20in%205-men%20pawnless%20tablebases%201.jpg http://www.polgarstarchess.com/DTM%20in%205-men%20pawnless%20tablebases%202.jpg http://www.polgarstarchess.com/DTM%20in%205-men%20pawnless%20tablebases%203.jpg http://www.polgarstarchess.com/DTM%20in%205-men%20tablebase...